首页|Performance comparison of aero-ramp and transverse injector based on gas-pilot flame
Performance comparison of aero-ramp and transverse injector based on gas-pilot flame
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A direct performance comparison between the four-hole aero-ramp injector and single transverse injector in a dual-mode scramjet combustor was conducted.The mixing characteristics of two injectors were calculated by solving the three-dimensional (3-D) compressible Reynolds-averaged Navier-Stokes equations (RANS),with the help of the shear-stress-transport (SST) k-ω turbulence model.The numerical results show that the far field mixing efficiency of the aero-ramp injector is higher than that of the single transverse injector.High enthalpy vitiated air was heated to a total temperature of 1 200 K by hydrogen-oxygen combustion,entering the isolator entrance at a Mach number of 2.0.Non-reacting experimental conditions involved sonic injection of nitrogen to safely simulate ethylene injected into the combustor at a jet-to-free stream momentum flux ratio of 2.6.Schlieren photographs were obtained to analyze the shock structure around the injectors.Reacting test conditions involved sonic injection of ethylene at the jet-to-free stream momentum flux ratios ranging from 0.5 to 2.7.High speed camera was used to capture the flame structures in the near-field combustion.The experimental results show that the aero-ramp injector produce sustained combustion over a wider range of fuel-air ratios than the single transverse injector.At the identical jet-to-free stream momentum flux ratio,the aero-ramp has a larger isolator margin than the single transverse injector,demonstrating a better ability for avoiding overflows.However,the air specific impulse and total temperature recovery of two injectors,which are calculated by the one-dimensional (1 D) performance analysis code,are almost identical.
dual-mode scramjetaero-ramp injectortransverse injectorgas-pilot flamemixing and combustion performance
SONG Gang-lin、ZHANG Yan、WEI Bao-xi、TIAN Liang、XU Xu
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School of Astronautics,Beijing University of Aeronautics and Astronautics, Beijing 100191, China
Xichang Satellite Launch Center,Chinese People's Liberation Amry General Armament Department,Xichang Sichuan 615608, China
Department of Civil Engineering,Nanyang Institute of Technology, Nanyang Henan 473004, China
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