Laser-Based Multiparameter Measurements

Abstract

Novel ultraviolet laser-based multidimensional measurement techniques were applied to the burner exit of a H 2 ± air jet engine. Two-dimensional Rayleigh scattering and one-dimensional Raman scattering were used to measure the mean temperature ® eld, the distributions of the majority species H 2 , O 2 , H 2 O, and N 2 , and the turbulence intensity distribution ¾ T /T in the burner exit plane. The wealth of data allows are elucidation of the turbulent mixing and combustion processes inside the burner. For example, the majority species distributions show that unburned H 2 occurred in certain regions in the burner exit plane that were essentially free of O 2 and vice versa. This pattern was constant in time. This means that certain¯ow structures in the burner caused rich mixing in some areas and lean mixing in others, and it explains why overall combustion was not complete in this particular burner.