High-Speed Laser Diagnostics for Understanding the Physicochemical Processes of Turbulent and Reacting Flows
Speaker: Jeff Sutton, The Ohio State University
Series: MAE Departmental Seminars
Location: Bowen Hall Room 222
Date/Time: Friday, October 3, 2014, 3:30 p.m. - 4:30 p.m.
Turbulent combustion processes currently account for the majority of the worlds energy usage and will continue to do so for the foreseeable future. Applications, which range from power generation to transportation, will rely on advancements in combustion systems that simultaneously increase efficiency, decrease harmful emissions, and offer increased fuel flexibility through the use of alternative fuels. However, such advancements are quite challenging due to the complex nature of turbulent combustion environments found in modern energy-conversion systems. Turbulent flows are inherently time-varying, multi-dimensional phenomena, and when coupled to chemical reactions, create a highly dynamic physicochemical system occurring on multiple length and time scales. In this seminar, I will discuss the targeted development and application of advanced laser diagnostic methods for examining and understanding flow turbulence, mixing, and turbulence-chemistry interaction in turbulent and reacting flow environments. The first part of the seminar will describe the scientific challenges (and requirements) of quantitative measurements in turbulent combustion systems. A primary focus concerns acquiring and interpreting data that is useful for both understanding the governing physical and chemical processes and providing benchmark data for combustion model assessment. I will also discuss the tremendous opportunity for unprecedented insight into turbulent combustion physics through the use of high-speed laser-based imaging. I will focus on recent advances made in my research group in the application of multi-kHz-rate planar laser-induced fluorescence (PLIF), Rayleigh scattering, and Raman scattering imaging in turbulent and reacting flows. I will describe the development of our unique high-energy pulse burst laser system, which has provided new opportunities to investigate turbulence and combustion dynamics. Examples include the investigation of large-scale mixing dynamics in turbulent jets and non-premixed flames and the role of temperature, mixture fraction, and scalar dissipation rate on the auto-ignition of transient fuel injection into hot, vitiated oxidizer streams.
Jeffrey Sutton received his Ph.D. (2005) in Aerospace Engineering from the University of Michigan and subsequently accepted a National Research Council Postdoctoral Fellowship within the Chemistry Division of the Naval Research Laboratory in Washington, D.C. In 2008, Prof. Sutton joined the faculty at Ohio State University, where he is currently an Associate Professor in the Department of Mechanical and Aerospace Engineering. Prof. Suttons current research interests include turbulent mixing and combustion, the development and application of advanced laser diagnostics, vaporization and gas-phase mixing in turbulent sprays, auto-ignition dynamics, turbulent combustion of alternative fuels, inter-scale energy transfer in high-Reynolds number flows, and plasma-assisted combustion. Prof. Sutton is the recipient of the National Science Foundation CAREER award, the Air Force Office of Scientific Research Young Investigator Program award, the American Chemical Society Petroleum Research Foundation New Doctoral Investigator award, and the Distinguished Paper award at the 31st International Symposium on Combustion.