Mixing Characteristics in a Supersonic Combustor with Gaseous Fuel Injection Upstream of a Cavity Flameholder |
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Authors: | Ming-bo Sun Hui Geng Jian-han Liang Zhen-guo Wang |
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Institution: | (1) College of Aerospace and Material Engineering, National University of Defense Technology, Changsha, 410073, China |
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Abstract: | Non-reacting experiments and numerical simulations have been performed to investigate the mixing characteristics in a supersonic
combustor with gaseous fuel injection upstream of a flameholding cavity in a supersonic vitiated air flow with stream Mach
number 1.7. Using helium as simulated fuel, the acetone vapor is adulterated into the fuel jet. The fuel distribution in spanwise
and streamwise direction is imaged by the planar laser-induced fluorescence (PLIF) measurement. According to the similarity
of experimental observations with different cavities, the typical L/D = 7 cavity with aft wall angle 45° is chosen and the
flowfield with the injection is calculated by Large Eddy Simulation. Experimental and numerical results have shown that most
of the fuel flow away upon the open cavity with the lifting counter-rotating vortex structures induced by the transverse jet.
Only a small portion of the fuel is convected into the cavity shear layer by the vortex interaction of the jet with cavity
shear layer, and then transported into the cavity due to the cavity shear layer motion and the interaction of the shear layer
with the cavity trailing edge. |
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Keywords: | PLIF Cavity shear layer Cavity flameholder Large eddy simulation |
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