Investigation of the mixing characteristics in a transverse hydrogen injection combustor with an inlet compression ramp

摘要

A shock-enhanced mixing in a transverse hydrogen injection combustor with an inlet compression ramp is carried out by using Large-eddy simulation (LES). Effects of a shock train induced by the inlet compression ramp on the mixing process have been investigated at three jet to cross-flow momentum flux ratios, J. The counter-rotating vortex pairs (CVP), promoting the mixing process of the fuel jet plume and mainstream air, is significantly affected by the reflected shock. The vorticity analysis is constructed to further understand the turbulent mixing mechanism. The shock-induced baroclinic torque is found to play an important role on the generation of the vorticity in the near field of the fuel jet, and the place where the reflected shock interacts with the jet plume. In addition, the probability density function (PDF) of mixture fraction is also investigated.