The formation of soot is an artifact of the non-premixed combustion and the pressure has a significant degree of influence on soot processes. In gas turbines for aircraft propulsion and in diesel engines, where the mode of operation is for the most part is non-premixed and partially-premixed combustion, a reliable and consistent combustion process is possible with overall equivalence ratios much lower than the lean flammability limits. In addition, these engines operate at pressures exceeding 40 atm in gas turbines and 100 atm in diesel engines for thermal efficiency and compactness concerns. However, tractable soot related measurements at elevated pressures are extremely limited and most of the information available is at atmospheric pressure. Since the chemical reactions governing the various flame processes are intrinsically nonlinear, the responses of combustion events to pressure changes are not usually monotonic. Therefore, it is extremely difficult to scale measurements at atmospheric flames to high-pressure combustion. In this talk, soot measurements at elevated pressures at UTIAS in non-premixed laminar flames of various gaseous and liquid fuels will be presented and the relevance of the results to practical combustion systems will be discussed.
Ömer Gülder, University of Toronto
Room number or other detail:
Friday, October 16, 2015 - 3:30pm
Dr. Gülder is a professor at the University of Toronto Institute for Aerospace Studies (UTIAS) since 2001 and associate director of UTIAS since 2007. Before joining UTIAS as a faculty member, he worked as a researcher and then as the section head of the combustion laboratory at the National Research Council of Canada. Dr. Gülder completed his PhD at the University of Manchester, UK, and his undergraduate and MSc degrees at the Middle East Technical University, Turkey. His current research interests include high pressure combustion, soot formation, turbulent combustion, bio-fuels for aviation, and aviation fuel thermal stability. He has published over 250 papers on combustion related subjects and served on the editorial boards of Combustion and Flame, International Journal of Thermal Sciences, and International Journal of Engine Research. He shares three patents on non-intrusive soot diagnostics. He was the chair of the Canadian Section of the Combustion Institute for 10 years and was on the board of directors of the Combustion Institute for 12 years. In addition to his fundamental research activities in combustion and propulsion, he is involved in industrial research efforts in collaboration with the major gas turbine engine manufacturers in Canada. Dr. Gülder is a fellow of the Canadian Academy of Engineering.