双模态燃烧室激波链/附面层相互干扰研究

研究优化燃烧室控制问题,燃烧引起的压力升高扰动对于双模态燃烧室流场内激波链/附面层相互干扰强度影响,同时由于喷油调节对燃烧效率也影响较大。为解决上述问题,采用变换燃烧室出口反压。计算出燃烧室内燃烧引起压力升高的实际情况,对不同出口反压条件下的双模态燃烧室冷流流场进行了数值仿真,并与试验结果进行对比,两者相互吻合。结果表明,燃烧室内激波链结构强度及位置对于出口反压的变化非常敏感,在实际燃烧室工作中可通过选择合适的供油规律来获得燃烧引起压力扰动对激波链结构强度及位置的气动控制,可实现双模态燃烧室的模态转换,使得燃烧室工作在最优模态。

Investigation of Interaction of Shock Train/Boundary Layer in Dual Mode Supersonic Combustor

The optimization of combustion controlling was investigated.The pressure disturbance induced by fuel combustion has strong influence on the intensity and position of the interactive shock train/boundary layer in dual mode supersonic combustor.Moreover,the fuel injection mode has strong influence on combustion efficiency.To solve the issue mentioned above,we conducted the numerical simulation of the dual mode combustor flow field by changing counter pressure of combustor outlet to simulate the pressure raise of fuel combustion.The simulation results were found to agree with the experimental data well.The results show that,the position and intensity of shock-train are sensitive to counter pressure.In actual working,we can obtain the aerodynamic control of the pressure raise of fuel combustion to the shock train by adjusting fuel supply regulation.Consequently,the mode transition is realized,making the dual mode supersonic combustor working in the optimal state.