Seminar- Modeling Interactions among Turbulence, Gas-Phase Chemistry, Soot Particles and Radiation in Flames

01/19/2012 - 3:30pm
Foothills Laboratory 2 - Room 1022

Dan Haworth, Department of Mechanical & Nuclear Engineering The Pennsylvania State University University Park, PA

Complex and sometimes subtle interactions among hydrodynamic turbulence, gas-phase chemistry, dispersed liquid and/or solid phases (e.g., fuel sprays and/or soot) and radiation heat transfer can influence performance and emissions in practical combustion systems. Modeling approaches that neglect these interactions, or that treat them in an over-simplified manner, can yield large errors in computed temperatures, heat-release and heat-transfer rates and pollutant emissions. Similar interactions are important in chemical engineering and atmospheric flows. Transported probability density function (PDF) methods provide a rational modeling framework that captures key physical processes and their interactions in a natural manner. Examples illustrating the importance of turbulence-chemistry-soot-radiation interactions (TCSRI) in laboratory flames and piston engines will be presented. The ability of PDF-based modeling approaches to accommodate realistic chemistry, detailed soot models, spectral radiation treatments and TCSRI will be demonstrated for Reynolds-averaged and large-eddy simulations. Developments aimed at reducing the high computational cost of PDF methods, and in dealing with their somewhat unconventional Lagrangian-particle-based solution algorithms, will be discussed.