Lei Shi , Haijian Lou  , Da Gao  , Xiaowei Liu  , Fei Qin  , Guoqiang He

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018_1690847

Sufficient back pressure resistance of RBCC inlet is one of the most important performance requirements for an RBCC engine during its whole flight, especially in the near flight duration after the inlet starts at a low Mach number. Higher back pressure resistance of RBCC inlet leads to robust engine operation, more efficient combustion and thus a higher engine thrust and specific impulse. Two-dimensional numerical simulations were conducted based on an RBCC inlet model operating at Mach 2.5. The dynamic generation and movement of the shocks in the inlet were simulated under a certain back pressures. The influence rules of the embedded rocket operation conditions and configuration on the maximum back pressure resistance of the RBCC inlet were also numerically investigated. (1) The embedded rocket significantly increases the back pressure resistance of the inlet by enhancing the total pressure and momentum of the captured flow and sweeping the boundary layer flow near the upper wall. (2) The chamber pressure of embedded rocket influences the maximum back pressure resistance of the RBCC inlet most significantly. The Pb,max was effectively enhanced at most by 52.6% when the Pc increased from 0MPa to 9MPa. (3) The influence of the chamber temperature is slight while the expansion angle of rocket nozzle almost had no effect on the back pressure resistance.

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In Categories: High-Speed Aerodynamics and Aerothermodynamics, HiSST 2018, Hypersonic Propulsion, Materials and Structures
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