Local equilibrium temeperature as a measure of stretch and preferential diffusion effects in counterflow H_2/air premixed flames

摘要

The effects of stretch and preferential diffusion on the structure and extinction of hydrogen-air premixed flames are investigated numerically.A symmetric double-flame configuration in a counterflow is adopted as a model porblem.A local totla enthalpy and enthalpies of formaiton of local mixture and corresponding equilibrium composition are discussed in conjunction with the energy status of local mixtures.Based on these,a local adiabatic equilibrium temeprature is proposed as a measrue of energy loss and gain caused by preferential diffusion,flame stretch,and reaction incompleteness.