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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2004, Vol. 25 ›› Issue (2): 113-116.

• 论文 • Previous Articles     Next Articles

Numerical Simulation on Supersonic Combustion over a Reward Facing Step with Transverse Hydrogen and Air Injection

CUI Yu-feng, XU Gang, HUANG Wei-guang   

  1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2003-02-17 Revised:2003-06-20 Online:2004-04-25 Published:2004-04-25

Abstract: In order to enhance the combustion efficiency of supersonic combustion chamber with a rearward facing step, this paper presents a new method which adds a transverse air injection after the hydrogen injection. A numerical simulation study of this method has been done using Reynolds stress model and finite-rate chemistry model with detailed chemical reaction mechanism of hydrogen-air combustion. The results show that this method may effectively enhance the mixing efficiency of hydrogen and air, and that the combustion efficiency is improved from 60% to 64% under the computational conditions. However, as the static pressure and Mach number of the transverse air injection increase, a separation of the supersonic air stream firstly arises at the corner of the step and then there will be a shock wave at the cross section of the step. After that the position of the shock wave gradually moves upstream. In addition, the total pressure loss increases.

Key words: supersonic combustion, numerical simulation, combustion efficiency, finite-rate model, Reynolds stress model