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Kyprianidis, KonstantinosORCID iD iconorcid.org/0000-0002-8466-356X
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Publications (10 of 78) Show all publications
Kyprianidis, K. (2019). On Gas Turbine Conceptual Design. (Doctoral dissertation). Cranfield, United Kingdom: Cranfield University
Open this publication in new window or tab >>On Gas Turbine Conceptual Design
2019 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

The thesis begins with a review of the evolution of the industry's vision for the aero-engine design of the future. Appropriate research questions are set that can influence how this vision may further evolve in the years to come. Design constraints, material technology, customer requirements, noise and emissions legislation, technology risk and economic considerations and their effect on optimal concept selection are discussed in detail. Different aspects of the pedagogy of gas turbine conceptual design as well as information on the Swedish and Brazilian educational systems are also presented.

A multi-disciplinary aero-engine conceptual design tool is utilised for assessing engine/aircraft environmental performance. The tool considers a variety of disciplines that span conceptual design including: engine performance, engine aerodynamic and mechanical design, aircraft design and performance, emissions prediction and environmental impact, engine and airframe noise, and production, maintenance and direct operating costs.

With respect to addressing the research questions set, several novel engine cycles and technologies - currently under research - are identified. It is shown that there is great potential to reduce fuel consumption for the different concepts identified, and consequently decrease the CO2 emissions. Furthermore, this can be achieved with sufficient margin from the NOx certification limits set by International Civil Aviation Organisation, and in line with the medium-term and long-term goals set through it's Committee on Aviation Environmental Protection.

The option of an intercooled-core geared-fan aero-engine for long-haul applications is assessed by means of a detailed design space exploration. An attempt is made to identify the fuel burn optimal values for a set of engine design parameters by varying them all simultaneously, as well as in isolation. Different fuel optimal designs are developed based on different sets of assumptions. Evidence is provided that higher overall pressure ratio intercooled engine cycles become more attractive in aircraft applications that require larger engine sizes.

The trade-off between the ever-increasing energy efficiency of modern aero-engines and their NOx performance is assessed. Improving engine thermal efficiency has a detrimental effect on NOx emissions for traditional combustors, both at high altitude and particularly at sea-level conditions. Lean-combustion technology does not demonstrate such behaviour and can therefore help decouple NOx emissions performance from engine thermal efficiency. If we are to reduce the contribution of aviation to global warming, however, future certification legislation may need to become more stringent and comprehensive, i.e., cover high altitude conditions. By doing so we can help unlock the competitive advantage of lean burn technology in relation to cruise NOx and mission performance.

Finally, some insight is provided on the potential benefits to be tapped from a transition from the traditional deterministic approach for system analysis to a stochastic (robust design) approach for economic decision-making under uncertainty. A basic methodology is outlined and applied on a specific conceptual design case for a conventional turbofan engine. The sensitivity of an optimal engine design obtained deterministically to real-life uncertainties is found to be far from negligible. The considerable impact of production scatter, measurement uncertainties as well as component performance deterioration, on engine performance must be catered for; this includes taking into consideration control system design aspects. A fast analytical approach is shown to be sufficiently accurate for the conceptual design process, particularly for estimating key performance parameters. These relate to type-test certication and performance retention guarantees including preliminary estimates of engine production margins.

Lessons learned are presented from: (i) the integration of different elements of conceptual design in a new BSc course and an existing traditional MSc course on gas turbine technology, (ii) the development of an intensive course on gas turbine multi-disciplinary conceptual design. The results from the use of problem-based learning are very encouraging, in terms of enhancing student learning and developing engineering skills.

Place, publisher, year, edition, pages
Cranfield, United Kingdom: Cranfield University, 2019. p. 198
National Category
Aerospace Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-43170 (URN)
Public defence
, Cranfield (English)
Opponent
Supervisors
Available from: 2019-04-23 Created: 2019-04-21 Last updated: 2019-04-23Bibliographically approved
Hosain, M. L., Domínguez, J. M., Bel Fdhila, R. & Kyprianidis, K. (2019). Smoothed particle hydrodynamics modeling of industrial processes involving heat transfer. Applied Energy, 252, Article ID 113441.
Open this publication in new window or tab >>Smoothed particle hydrodynamics modeling of industrial processes involving heat transfer
2019 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 252, article id 113441Article in journal (Refereed) Published
Abstract [en]

Smoothed Particle Hydrodynamics (SPH) is a mesh-free particle method that has been widely used over the past decade to model complex flows. The method has mainly been used to investigate problems related to hydrodynamics and maritime engineering, in which heat transfer does not play a key role. In this article, the heat-conduction equation is implemented in the open-source code DualSPHysics, based on the SPH technique, and applied to different study cases, including conduction in still water in a cavity, laminar water flow between two infinite parallel plates and tube bank heat exchanger. The thermal solutions obtained from SPH are benchmarked with the solutions from Finite Volume Method (FVM) and validated using available analytical solutions. DualSPHysics results are in good agreement with FVM and analytical models, and demonstrate the potential of the meshless approach for industrial applications involving heat transfer.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
CFD analysis, DualSPHysics, Finite Volume Method, Smoothed Particle Hydrodynamics, Transient heat transfer
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-44869 (URN)10.1016/j.apenergy.2019.113441 (DOI)2-s2.0-85067552454 (Scopus ID)
Note

Export Date: 11 July 2019; Article; CODEN: APEND; Correspondence Address: Hosain, M.L.; Mälardalen University, School of Business, Society & Engineering, P.O. Box 883, Sweden; email: md.lokman.hosain@mdh.se

Available from: 2019-07-11 Created: 2019-07-11 Last updated: 2019-07-11Bibliographically approved
Hermansson, K., Kos, C., Starfelt, F., Kyprianidis, K., Lindberg, C.-F. & Zimmerman, N. (2018). An Automated Approach to Building and Simulating Dynamic District Heating Networks. IFAC-PapersOnLine, 51(2), 855-860
Open this publication in new window or tab >>An Automated Approach to Building and Simulating Dynamic District Heating Networks
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2018 (English)In: IFAC-PapersOnLine, ISSN 2405-8963, Vol. 51, no 2, p. 855-860Article in journal (Refereed) Published
Abstract [en]

In Nordic countries, district heating accounts for a large share of the consumers’  heat demand. In Sweden, roughly 50% of the total heat demand is attributed to district heating. Which, over the past few years, is equivalent to around 50 TWh, and imposes a difficult balance between supply and demand for the suppliers of district heating. For large networks the propagation of heat from supplier to end-user can vary several hours. Further complexities of large networks, which can consist of multiple overlapping rings, is that during transient conditions the flow can actually change direction. A dynamic modeling library has been developed in Modelica using OpenModelica for district heating networks. Methods for modeling, handling data, simulating and the visualization of results has been developed using Matlab. The model has been validated using data from Mälarenergi  AB, a local provider of district heating in Västerås, Sweden. The model provides to an acceptable degree in predicting the heat propagation and temperature distribution in a localized case study. Adding a higher level of robustness, the model has the capacity to handle bi-directional and reversing flows in complex ring structures. Through this work, the combination of OpenModelica and Matlab, a framework for automating the building and simulation of district heating networks is obtainable. The implications of automating network modeling from computer-aided design drawings allows for a quick robust overview of how the network is working and how prospective additions to the network could impact the end-users. Furthermore, incorporating visual aspects for heat propagation in a network contributes to a higher understanding of complex network structures. 

Place, publisher, year, edition, pages
Elsevier B.V., 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-39303 (URN)10.1016/j.ifacol.2018.04.021 (DOI)000435693000146 ()2-s2.0-85046689930 (Scopus ID)
Available from: 2018-05-24 Created: 2018-05-24 Last updated: 2018-07-12Bibliographically approved
Goldberg, C., Nalianda, D., Sethi, V., Pilidis, P., Singh, R. & Kyprianidis, K. (2018). Assessment of an energy-efficient aircraft concept from a techno-economic perspective. Applied Energy, 221, 229-238
Open this publication in new window or tab >>Assessment of an energy-efficient aircraft concept from a techno-economic perspective
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2018 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 221, p. 229-238Article in journal (Refereed) Published
Abstract [en]

An increase in environmental awareness in both the aviation industry and the wider global setting has led to large bodies of research dedicated to developing more sustainable technology with a lower environmental impact and lower energy usage. The goal of reducing environmental impact has necessitated research into revolutionary new technologies that have the potential to be significantly more energy efficient than their predecessors. However, for innovative technologies in any industry, there is a risk that adoption will be prohibitively expensive for commercial application. It is therefore important to model the economic factors of the new technology or policy at an early stage of development. This research demonstrates the application of a Techno-economic Environmental Risk Assessment framework that may be used to identify the economic impact of an energy-efficient aircraft concept and the impact that environmental policy would have on the viability of the concept. The framework has been applied to a case study aircraft designed to achieve an energy saving of 60% in comparison to a baseline 2005 entry-into-service aircraft. The model compares the green aircraft concept to a baseline conventional aircraft using a sensitivity analysis of the aircraft direct operating cost to changes in acquisition and maintenance cost. The research illustrates an economically viable region for the technology. Cost margins are identified where the increase in operating cost due to expensive novel technology is counterbalanced by the reduction in cost resulting from low energy consumption. Viability was found to be closely linked to fuel price, with a low fuel price limiting the viability of energy-efficient aviation technology. In contrast, a change in environmental taxation policy was found to be beneficial, with the introduction of carbon taxation incentivising the use of an environmentally optimised aircraft.

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-39030 (URN)10.1016/j.apenergy.2018.03.163 (DOI)000433269000020 ()2-s2.0-85044976512 (Scopus ID)
Available from: 2018-04-18 Created: 2018-04-18 Last updated: 2018-06-21Bibliographically approved
Roberto Caetano, N., Schmitz Venturini, M., Roman Centeno, F., Katiuscia Lemmertz, C. & Kyprianidis, K. (2018). Assessment of mathematical models for prediction of thermal radiation heat loss from laminar and turbulent jet non-premixed flames. Thermal Science and Engineering Progress, 7, 241-247
Open this publication in new window or tab >>Assessment of mathematical models for prediction of thermal radiation heat loss from laminar and turbulent jet non-premixed flames
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2018 (English)In: Thermal Science and Engineering Progress, ISSN 2451-9049, Vol. 7, p. 241-247Article in journal (Refereed) Published
Abstract [en]

Radiation plays an important role in several processes, being of particular interest to energy efficiency and safety of staff and facilities, mainly in the aerospace industry. In this context, along the last years mathematical models have been developed and reported in the literature aiming to obtain reliable predictions of thermal radiation in combustion applications. Some simplified models consider that thermal radiation emmited by a flame is mainly governed by the flame temperature, while other ones also account for the contribution of the combustion products. On the other hand, more detailed models include both flame geometry and composition. Many efforts have been made by several scientists in order to develop these models, however, there is no validation applied in different operating conditions found in the literature. Thus, the novelty brought by this work consists in an assessment on the comparison between the experimental data of thermal radiation emitted by jet non-premixed flames and the results obtained by calculations applying these models on several flame conditions, encompassing a wide range of applications: laminar and turbulent flames, buoyancy and momentum-driven flames, low-carbon and high-carbon fuels. Such assessments are important to assist combustion system designers on selecting the most adequate thermal radiation model during the project of a combustion system or process. The results found in the current investigation pointed out to a good agreement between experimental data and predictions obtained by detailed models, which consider flame geometry and radiative properties. On the other hand, simplified models must be avoided if accurate predictions of radiation are being sought, despite this, they can be employed as engineering tools for risk analysis, once, in general, they provided higher predictions when compared to the experiments, resulting in a safety factor to engineers and designers.

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-40261 (URN)10.1016/j.tsep.2018.06.008 (DOI)2-s2.0-85049572613 (Scopus ID)
Available from: 2018-07-19 Created: 2018-07-19 Last updated: 2018-07-19Bibliographically approved
Rahman, M., Zaccaria, V., Xin, Z. & Kyprianidis, K. (2018). Diagnostics-Oriented Modelling of Micro Gas Turbines for Fleet Monitoring and Maintenance Optimization. Processes, 6(11)
Open this publication in new window or tab >>Diagnostics-Oriented Modelling of Micro Gas Turbines for Fleet Monitoring and Maintenance Optimization
2018 (English)In: Processes, ISSN 2227-9717, E-ISSN 1099-5862, Vol. 6, no 11Article in journal (Refereed) Published
Abstract [en]

The market for the small-scale micro gas turbine is expected to grow rapidly in the coming years. Especially, utilization of commercial off-the-shelf components is rapidly reducing the cost of ownership and maintenance, which is paving the way for vast adoption of such units. However, to meet the high-reliability requirements of power generators, there is an acute need of a real-time monitoring system that will be able to detect faults and performance degradation, and thus allow preventive maintenance of these units to decrease downtime. In this paper, a micro gas turbine based combined heat and power system is modelled and used for development of physics-based diagnostic approaches. Different diagnostic schemes for performance monitoring of micro gas turbines are investigated.

Keywords
micro gas turbine; modelling; diagnostics, gas path analysis, analysis by synthesis
National Category
Energy Systems
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-41514 (URN)10.3390/pr6110216 (DOI)000451530400012 ()2-s2.0-85057867402 (Scopus ID)
Projects
FUDIPO
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2019-01-16Bibliographically approved
Zaccaria, V., Stenfelt, M., Aslanidou, I. & Kyprianidis, K. (2018). Fleet monitoring and diagnostics framework based on digital twin of aero-engines. In: Proceedings of the ASME Turbo Expo: . Paper presented at ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018, 11 June 2018 through 15 June 2018. American Society of Mechanical Engineers (ASME), 6
Open this publication in new window or tab >>Fleet monitoring and diagnostics framework based on digital twin of aero-engines
2018 (English)In: Proceedings of the ASME Turbo Expo, American Society of Mechanical Engineers (ASME) , 2018, Vol. 6Conference paper, Published paper (Refereed)
Abstract [en]

Monitoring aircraft performance in a fleet is fundamental to ensure optimal operation and promptly detect anomalies that can increase fuel consumption or compromise flight safety. Accurate failure detection and life prediction methods also result in reduced maintenance costs. The major challenges in fleet monitoring are the great amount of collected data that need to be processed and the variability between engines of the fleet, which requires adaptive models. In this paper, a framework for monitoring, diagnostics, and health management of a fleet of aircrafts is proposed. The framework consists of a multi-level approach: starting from thresholds exceedance monitoring, problematic engines are isolated, on which a fault detection system is then applied. Different methods for fault isolation, identification, and quantification are presented and compared, and the related challenges and opportunities are discussed. This conceptual strategy is tested on fleet data generated through a performance model of a turbofan engine, considering engine-to-engine and flight-to-flight variations and uncertainties in sensor measurements. Limitations of physics-based methods and machine learning techniques are investigated and the needs for fleet diagnostics are highlighted. 

Place, publisher, year, edition, pages
American Society of Mechanical Engineers (ASME), 2018
Keywords
Aircraft engines, Engines, Fault detection, Learning systems, Turbofan engines, Turbomachinery, Uncertainty analysis, Aircraft performance, Fault detection systems, Life prediction methods, Machine learning techniques, Monitoring and diagnostics, Physics-based methods, Reduced maintenance costs, Sensor measurements, Fleet operations
National Category
Aerospace Engineering
Identifiers
urn:nbn:se:mdh:diva-41129 (URN)10.1115/GT2018-76414 (DOI)000456908700036 ()2-s2.0-85053863979 (Scopus ID)9780791851128 (ISBN)
Conference
ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018, 11 June 2018 through 15 June 2018
Available from: 2018-10-08 Created: 2018-10-08 Last updated: 2019-02-14Bibliographically approved
Hosain, M. L., Bel Fdhila, R. & Kyprianidis, K. (2018). Simulation and validation of flow and heat transfer in an infinite mini-channel using Smoothed Particle Hydrodynamics. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China. Elsevier
Open this publication in new window or tab >>Simulation and validation of flow and heat transfer in an infinite mini-channel using Smoothed Particle Hydrodynamics
2018 (English)In: Energy Procedia, Elsevier, 2018Conference paper, Published paper (Refereed)
Abstract [en]

Fluid flow and heat transfer in small channels have a wide range of engineering and medical applications. It has always been a topic of numerous theoretical, numerical and experimental studies. Several numerical methods have been used to simulate such flows. The most common approaches are the finite volume method (FVM) and the direct numerical simulation (DNS), which are numerically expensive to solve cases involving complex engineering problems. The main purpose of this work is to investigate the usability of the mesh-free particle based Smoothed Particle Hydrodynamics (SPH) method to simulate convective heat transfer. To validate our approach, as a starting point, we choose to solve a simple well-established problem which is the laminar flow and heat transfer through an infinitely long mini-channel. The solution obtained from SPH method has been compared to the solution from FVM method and analytical solution with good accuracy. The results presented in this paper show that SPH is capable to solve laminar forced convection heat transfer, however, turbulent flow cases need to be considered to be able to utilize the SPH method for engineering thermal applications.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Poiseuille flow, mini-channel, CFD analysis, Heat transfer, SPH, FVM
National Category
Energy Engineering Fluid Mechanics and Acoustics
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-41275 (URN)10.1016/j.egypro.2019.01.533 (DOI)000471031706043 ()2-s2.0-85063895098 (Scopus ID)
Conference
10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China
Projects
MR-OMDO
Available from: 2018-11-01 Created: 2018-11-01 Last updated: 2019-07-11Bibliographically approved
Aslanidou, I., Zaccaria, V., Pontika, E., Zimmerman, N., Kalfas, A. I. & Kyprianidis, K. (2018). Teaching gas turbine technology to undergraduate students in Sweden. In: Proceedings of the ASME Turbo Expo: . Paper presented at ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018, 11 June 2018 through 15 June 2018; Code 138886. American Society of Mechanical Engineers (ASME), 6
Open this publication in new window or tab >>Teaching gas turbine technology to undergraduate students in Sweden
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2018 (English)In: Proceedings of the ASME Turbo Expo, American Society of Mechanical Engineers (ASME) , 2018, Vol. 6Conference paper, Published paper (Refereed)
Abstract [en]

This paper addresses the teaching of gas turbine technology in a third-year undergraduate course in Sweden and the challenges encountered. The improvements noted in the reaction of the students and the achievement of the learning outcomes is discussed. The course, aimed at students with a broad academic education on energy, is focused on gas turbines, covering topics from cycle studies and performance calculations to detailed design of turbomachinery components. It also includes economic aspects during the operation of heat and power generation systems and addresses combined cycles as well as hybrid energy systems with fuel cells. The course structure comprises lectures from academics and industrial experts, study visits, and a comprehensive assignment. With the inclusion of all of these aspects in the course, the students find it rewarding despite the significant challenges encountered. An important contribution to the education of the students is giving them the chance, stimulation, and support to complete an assignment on gas turbine design. Particular attention is given on striking a balance between helping them find the solution to the design problem and encouraging them to think on their own. Feedback received from the students highlighted some of the challenges and has given directions for improvements in the structure of the course, particularly with regards to the course assignment. This year, an application developed for a mobile phone in the Aristotle University of Thessaloniki for the calculation of engine performance will be introduced in the course. The app will have a supporting role during discussions and presentations in the classroom and help the students better understand gas turbine operation. This is also expected to reduce the workload of the students for the assignment and spike their interest.

Place, publisher, year, edition, pages
American Society of Mechanical Engineers (ASME), 2018
Keywords
Curricula, E-learning, Fuel cells, Gas turbines, Gases, Machine design, Structural design, Teaching, Engine performance, Gas turbine design, Gas Turbine Technologies, Hybrid energy system, Performance calculation, Turbomachinery components, Undergraduate Courses, Undergraduate students, Students
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-41126 (URN)10.1115/GT2018-77074 (DOI)000456908700049 ()2-s2.0-85053912750 (Scopus ID)9780791851128 (ISBN)
Conference
ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018, 11 June 2018 through 15 June 2018; Code 138886
Available from: 2018-10-08 Created: 2018-10-08 Last updated: 2019-02-14Bibliographically approved
Aslanidou, I., Zaccaria, V., Rahman, M., Oostveen, M., Olsson, T. & Kyprianidis, K. (2018). Towards an Integrated Approach for Micro Gas Turbine Fleet Monitoring, Control and Diagnostics. In: : . Paper presented at Global Power and Propulsion Forum 2018, Zurich, Switzerland.
Open this publication in new window or tab >>Towards an Integrated Approach for Micro Gas Turbine Fleet Monitoring, Control and Diagnostics
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2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Real-time engine condition monitoring and fault diagnostics results in reduced operating and maintenance costs and increased component and engine life. Prediction of faults can change the maintenance model of a system from a fixed maintenance interval to a condition based maintenance interval, further decreasing the total cost of ownership of a system. Technologies developed for engine health monitoring and advanced diagnostic capabilities are generally developed for larger gas turbines, and generally focus on a single system; no solutions are publicly available for engine fleets. This paper presents a concept for fleet monitoring finely tuned to the specific needs of micro gas turbines. The proposed framework includes a physics-based model and a data-driven model with machine learning capabilities for predicting system behaviour, combined with a diagnostic tool for anomaly detection and classification. The integrated system will develop advanced diagnostics and condition monitoring for gas turbines with a power output under 100 kW.

National Category
Aerospace Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-43169 (URN)
Conference
Global Power and Propulsion Forum 2018, Zurich, Switzerland
Available from: 2019-04-21 Created: 2019-04-21 Last updated: 2019-06-03Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8466-356X

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