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Cool flames: how does it burn differently?

Event Type
Mechanical Science and Engineering
190 Engineering Sciences Building
Oct 12, 2021   4:00 pm  
Professor Yiguang Ju, Department of Mechanical and Aerospace Engineering, Princeton University
Amy Rumsey
Originating Calendar
MechSE Seminars


Matering of fire is a the history of mankind civilization. The recent findings of cool flames and warm flames may lead to new thinkings in the development of low carbon fuels and advanced engines.  In this seminar, a review of the recent progresses in low-temperature flame chemistry and dynamics as well as their impacts on combustion, engine and fuel development will be presented. Specifially, at first, experimental estabilishment and computational modeling of the propagation speeds and burning limits of diffusion and premixed cool flames and warm flames will be introduced. The flammability limit diagrams and temperature-dependent chain-branching reaction pathways for hot, warm, and cool flames will be discussed and analyzed. Secondly, the effect of low temperature auto-ignition at high ignition Damköhler numbers on laminar and turbulent flames speeds will be examined. Thirdly, the impacts of low-temperature combustion on engine knock, deflagaration to detonation transition, fuel design, and chemical kinetic model development will be presented. Finally, a concept of cool flame radical index will be presented for rapid screening of alternative fuels for advanced engines.


About the Speaker

Yiguang Ju is the Robert Porter Patterson Professor at Princeton University. He received his bachelor degree from Tsinghua University in 1986, and his PhD degree in Mechanical and Aerospace Engineering from Tohoku University in 1994.  He was appointed as an Assistant and Associate Professor at Tohoku University from 1995 to 1999, and as a Chang-Jiang Professor and the Director of Thermo-physics Institute at Tsinghua University in 2000. He joined Princeton University in 2001. Ju’s research interests include combustion, fuels, propulsion, plasma, and energy materials for low carbon energy conversion and chemical manufacturing. He has published more than 250 journal articles. He is an ASME Fellow and an inaugural Fellow of the Combustion Institute. He served as the chair of US Sections of the Combustion Institute and is a Board of Director of the Combustion Institute, the NASA rocket study committee and the NAS steering committee for NASA decadal survey on biological and physical sciences research in space. He received the Bessel Research Award from von Humboldt Foundation, NASA Director’s appreciation award, and the AIAA 2021 Propellants and Combustion award, and was a plenary speaker of the 38th International Symposium on Combustion.


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