Observation of mixing and combustion processes of H2 jet injected into supersonic streamwise vortices
We will present the main results of our experimental investigation of the supersonic mixing and combustion processes of gaseous hydrogen injected into the streamwise vortices in the Mach 2 and 2.5 vitiation airflow. Instantaneous Mie scattering and OH-PLIF images clearly show 1) the evolution of various scale turbulent eddies and coherent eddy structures within the large-scale streamwise vortices, 2) breakdown of streamwise vortices due to combustion, which lead to more uniform fuel distribution, and 3) the turbulent flame structures, in which the distributions of OH-emission and of its intensity show remarkably unsteady and random patterns in various spatial scales. These features demonstrate the ability of streamwise vortices to promote strong turbulent mixing and combustion in supersonic flows.
KeywordsStreamwise Vortex Strut Thickness Side View Image Flight Mach Number Expansion Ramp
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