The effect of exit strain rate on soot volume fraction in turbulent non-premixed jet flames

Abstract

Laser-Induced Incandescence (LII) measurements from soot were conducted in three attached turbulent non-premixed jet flames spanning various locations in each flame. The effect of the variation of the strain rate on soot behaviour is assessed through the comparison of the mean and integrated data for the three flames. The change is strain rate was achieved through the simultaneous variation of the jet burner diameter and the fuel exit velocity at the nozzle, thus allowing a systematic study of the influence of the exit strain rate in turbulent combustion while keeping the exit Reynold’s number constant. These measurements, which are part of an ongoing comprehensive study of the effect of strain rate on mean, instantaneous, integrated soot volume fraction as well as intermittency data, reveal an inverse relationship between the exit strain rate with the mean and instantaneous soot volume fraction (SVF), and agree with radiation tests performed previously for the same flames.