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RJTF Mach 8 Tests of a Scramjet Engine with Strut and Ramp Compression

机译：具有支柱和斜坡压缩的超燃冲压发动机的RJTF mach 8测试

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To improve combustion efficiency and the inlet start condition, a scramjet model with a ramp combined with a single strut was tested under Mach 8 flight conditions at the Ramjet Engine Test Facility of the Ramjet Propulsion Research Center. The attached ramp shielded some of the fuel injectors. The fuel flow rate from the open injectors to the flow path was designated as the effective fuel flow rate. In the tests, a combustion efficiency of 90% was attained with vertical injection of hydrogen fuel. The thrust increase was 590 N at the effective equivalence ratio of 1.3. However, because the engine geometry was not optimized, a sufficient increase in thrust was not attained. The high temperature and high pressure necessary for ignition and combustion were achieved by the ramp. When the pressure in the isolator was 160 times that of the free-stream air due to combustion, the inlet was in the started condition despite the high pressure. This improved started condition was attained by using the ramp to increase the pressure in the inlet.

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