Laser-based multiparameter measurements in a jet engine burner

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 field, the distributions of the majority species H 2 , O 2 , H 2 O, and N 2 , and the turbulence intensity distribution σ 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 flow 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.