Dr Michael J Pekris
About
Biography
Dr Michael Pekris completed his undergraduate and Masters degree in Engineering Science at the University of Oxford in 2004, and was a member of St Catherine's College. His Masters thesis was on liquid crystal heat transfer measurements in trapezoidal passages with jets for high pressure turbine blade internal cooling. Following a year in industry, working in a technical role at a mobile telecommunications consultancy, Michael returned to the Osney Thermofluids Laboratory in the Department of Engineering Science at Oxford, and by 2010 completed a Rolls-Royce/EPSRC funded doctorate in Mechanical Engineering. His work led to improvements in the industrial design of compliant contacting shaft seal technology for jet engines. He held a stipendiary lectureship at St Hugh's College, Oxford between 2007 and 2009, delivering mechanical engineering modules in the area of thermofluids and turbomachinery.
Before joining Surrey University, Michael worked in applied Research & Development within the Structures & Transmissions department (Gas Turbine Supply Chain) at Rolls Royce. There he led UK government supported research projects into advanced seal technology for civil aircraft, in collaboration with a number of commercial and academic partners and suppliers. He was industrial liaison for the Oxford University Technology Centre in Advanced Seals, and concurrently held the position of Departmental Intellectual Property Manager between 2013 and 2015.
While at Rolls-Royce, Michael was responsible for a range of computational and experimental research, and oversaw a number of in-house development engine and rig test campaigns. He has experience in component design, rig design, systems engineering, experimental methods, numerical simulation, model validation, tribology testing, metallurgical analysis, and mechanical and fatigue testing of materials. Michael received a Rolls-Royce Innovation Award in 2013, and is inventor on several patents in the fields of engine seals and waste heat recovery.
Michael is a Chartered Engineer and Member of the Institution of Mechanical Engineers, Member of the American Society of Mechanical Engineers, and a Fellow of the Higher Education Academy.
University roles and responsibilities
- IMechE Academic Liaison Officer and Senior Mentor
- Administrator for the Surrey University IMechE Monitored Professional Development Scheme (MPDS)
- Royal Academy of Engineering Visiting Professor Scheme - Academic Champion (2021 - 2023)
Affiliations and memberships
Mentor for developing engineers according to the Engineering Council UK-SPEC.
Heat Transfer Committee Member (ASME International Gas Turbine Institute).
News
In the media
ResearchResearch interests
- Environmental technologies including seals, and their application to aero-engines, unmanned aerial vehicles, and land-based industrial machines.
- Sustainable Aviation: More electric aircraft and hydrogen fuelled aircraft feasibility and thermal management.
- Fluid dynamics
- Heat transfer including thermal management and waste heat recovery
- Aerodynamics
- Thermodynamic cycles
- Rotating machinery: measurement and modelling
Research interests
- Environmental technologies including seals, and their application to aero-engines, unmanned aerial vehicles, and land-based industrial machines.
- Sustainable Aviation: More electric aircraft and hydrogen fuelled aircraft feasibility and thermal management.
- Fluid dynamics
- Heat transfer including thermal management and waste heat recovery
- Aerodynamics
- Thermodynamic cycles
- Rotating machinery: measurement and modelling
Teaching
- ENG2088 - 2nd Year Dynamics
- ENG2089 - 2nd Year Heat Transfer
- ENG3169 - 3rd Year Engineering Management
- Professional Training Year Visiting Tutor / Administrative Support.
Publications
Journal Articles
Du, Y., Pekris, M. J., Tian, G., 2023, "Influence of sealing cavity geometries on flank clearance leakage and pressure imbalance of micro-scale transcritical CO2 scroll expander by CFD modelling", Energy, 282:128775. [DOI: https://doi.org/10.1016/j.energy.2023.1287750]
Du, Y., Li, S., Pekris, M. J., Li, W., Tian, G., 2023, "Surrogate-Assisted Multi-Objective Optimisation of Transcritical Carbon Dioxide Scroll Expander Flank Clearance Based on Computational Fluid Dynamics", Energies, 282:116857. [DOI: 10.3390/en16145580]
Du, Y., Li, S., Pekris, M. J., Tian, G., 2023, "CFD analysis of flank clearance sizes on micro-scale transcritical CO2 scroll expander", Applied Thermal Engineering, 232:120980. [DOI: 10.1016/j.applthermaleng.2023.120980]
Farooqui, A., Wu, J., Morrell, R., Wright, L., Pekris, M. J., Whiting, M. J., 2023, “Evaluation of the Effect of Measurement Area on Laser Flash Characterisation of Partially Debonded Artefacts”, Int J Thermophys, 44. [DOI: 10.1007/s10765-023-03176-4]
Du, Y., Tian, G., Pekris, M. J., 2023, "Unsteady and Three-dimensional Computational Fluid Dynamics Modelling of Scroll Expander for Low-grade Waste Heat Recovery Transcritical Carbon Dioxide Micro-scale Power System", Energy Convers. Manag., 282:116857. [DOI: 10.1016/j.enconman.2023.116857]
Farooqui, A., Morrell, R., Wu, J., Wright, L., Lodeiro, M., Whiting, M. J., Pekris, M. J., Saunders, T., 2023, “Development and Characterization of SiC–Mo High-Temperature Multi-layer Laser Flash Artifacts with Partial Debonding”, Int J Thermophys, 44. DOI: 10.1007/s10765-022-03152-4
Liu, Y., Dong, W., Chew, J. W., Pekris, M. J., Benzhuang, Y., Kong, X., 2022, "Flow Conditioning to Control the Effects of Inlet Swirl on Brush Seal Performance in Gas Turbine Engines", Frontiers in Energy Research, Vol 9. [DOI: 10.3389/fenrg.2021.815152]
Farooqui, A., Morrell, R., Wu, J., Wright, L., Hay, B., Pekris, M. J., 2022, "Development of High Temperature Multi-Layer Laser Flash Artefacts". Int J Thermophys 43, 13. [DOI: 10.1007/s10765-021-02928-4]
Du, Y., Tian, G., Pekris, M. J., 2021, "A comprehensive review of micro-scale expanders for carbon dioxide related power and refrigeration cycles", Applied Thermal Engineering, Volume 201, Part A, 117722. [DOI: 10.1016/j.applthermaleng.2021.117722]
Liu, Y., Chew, J. W., Pekris, M. J., Kong, X., 2020, "The Effect of Inlet Swirl on Brush Seal Bristle Deflections and Stability", Journal of Engineering for Gas Turbines and Power, Mar 2020. DOI: 10.1115/1.4046696
Fico, V., Pekris, M. J., Barnes, C., Kha, R-K, Gillespie, D. R. H., 2016, ” CFD and Thermal Analysis of Leaf Seals for Aero-Engine Application”, J. Eng. Gas Turbines Power, GTP-16-1487 [DOI: 10.1115/1.4035595].
Pekris, M. J., Franceschini, G., Owen, A. K., Jones, T. V. and Gillespie, D. R. H., 2016, ”Analytical Modeling and Experimental Validation of Heating at the Leaf Seal/Rotor Interface”, J. Eng. Gas Turbines Power, GTP-16-1367 [DOI: 10.1115/1.4034702].
Pelegrin-Garcia, J-D., Gillespie, D. R. H., Pekris, M. J., Franceshini, G. and Ganin, L., 2016, “Experimental Characterization of Rotor Convective Heat Transfer Coefficients in the Vicinity of a Leaf Seal”, J. Eng. Gas Turbines Power [DOI: 10.1115/1.4034519].
Pekris, M. J., Franceschini, G., Jahn, I.H.J., Gillespie, D.R.H., 2015, “Experimental investigation of a leaf seal prototype at engine-representative speeds and pressures”, J. Eng. Gas Turbines Power, 138, 072502-9 [DOI: 10.1115/1.4031875].
Pekris, M. J., Nasti, A., Jahn, I.H.J., Franceschini, G., Gillespie, D.R.H., 2015, “High-Speed Characterization of a Prototype Leaf Seal on an Advanced Seal Test Facility”, J. Eng. Gas Turbines Power, 138, 082503-9 [DOI: 10.1115/1.4032422].
Pekris, M. J., Franceschini, G. and Gillespie, D.R.H., 2014, An investigation of the flow, mechanical and thermal characteristics of conventional and pressure balanced brush seals, J. Eng. Gas Turbines Power, 136, 062502-1 [DOI: 10.1115/1.4026243].
Conference Papers
Phan, H. M., Pekris, M. J., Chew, J. W., 2023, "Insights into Frictional Brush Seal Hysteresis", ASME Turbo Expo Boston Massachusetts, June 2023.
Wright, L., Farooqui, A., Wu, J., Pekris, M. J., Whiting, M., J., 2019, "Sensitivity Studies of Evaluating Partial De-Bonding Using Laser Flash Method", 34th International Thermal Conductivity Conference (ITCC), June 2019.
Liu, Y., Chew, J. W., Pekris, M. J., Kong, X., 2019, "The Effect of Inlet Swirl on Brush Seal Bristle Deflections and Stability", ASME Turbo Expo Phoenix Arizona, June 2019. [DOI: 10.1115/GT2019-90137]
Bianchi, G., Doherty, J., Pekris, M. J., 2018, "Aerodynamic Investigation of a Boundary Layer Ingesting Wing-Electric Ducted Fan Model", The Future of Aerodynamics - Royal Aeronautical Society, July 2018
Kumar, R., Pekris, M., J., Chew, J. W., Amirante, D. Hills, N. J., 2018, "CFD-FEA Simulation of Leaf Seal Dynamics", AIAA Joint Propulsion Conference, July 2018. [DOI: 10.2514/6.2018-4897]
Sridhar, V., Chana, K., Pekris, M. J., 2017, "High Temperature Eddy Current Sensor System for Turbine Blade Tip Clearance Measurements", European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, January 2017, [DOI: 10.29008/ETC2017-217]
Pekris, M. J., Franceschini, G., Owen, A. K., Jones, T. V. and Gillespie, D. R. H. (2016),”Analytical Modeling and Experimental Validation of Heating at the Leaf Seal/Rotor Interface”, ASME Turbo Expo 2016 GT2016-57577
Fico, V., Pekris, M. J., Barnes, C., Kha, R-K, Gillespie, D. R. H. (2016),” CFD and Thermal Analysis of Leaf Seals for Aero-Engine Application,” ASME Turbo Expo 2016 GT2016-56735.
Pelegrin-Garcia, J-D., Gillespie, D. R. H., Pekris, M. J., Franceshini, G. and Ganin, L. (2016) “Experimental Characterization of Rotor Convective Heat Transfer Coefficients in the Vicinity of a Leaf Seal”, ASME Turbo Expo 2016 GT2016-57603
Pekris, M. J., Franceschini, G., Jahn, I.H.J., Gillespie, D.R.H., 2015, “Experimental investigation of a leaf seal prototype at engine-representative speeds and pressures”, ASME Paper GT2015-43231.
Pekris, M. J., Franceschini, G., Jahn, I.H.J., Gillespie, D.R.H., 2015, “Experimental investigation of a leaf seal prototype at engine-representative speeds and pressures”, ASME Paper GT2015-43465.
Pekris, M. J., Franceschini, G., Gillespie, D.R.H., 2012,” An Investigation of Flow, Mechanical and Thermal Performance of Conventional and Pressure-Balanced Brush Seals”, ASME paper GT2012-68901.
Pekris, M. J., Franceschini, G., Gillespie, D. R. H., 2011, ”Effect of Geometric Changes in an Idealised Contacting Brush Seal Bristle Pack on Typical Key Performance Measures”, ASME Paper GT2011-46492.