隔板对燃烧室声学特性的影响

为了研究液体火箭发动机燃烧室出现的横向一阶切向燃烧不稳定,通过冷态声学试验和理论算例的计算,研究了不同参数的隔板装置对一阶切向声学频率及阻尼特性的影响,结果表明:增加轴向隔板长度和径向隔板数目均会降低一阶切向声学频率,同时增强声阻尼效果;喷嘴式隔板产生的声阻尼效果,比典型直板形状的隔板要好得多,隔板喷嘴最佳间隙在0.1~0.4mm,采用最佳隔板喷嘴间隙能够在较短的轴向隔板长度上得到较高的阻尼能力,从而改善冷却问题.

Effects of baffle on combustion acoustic characteristics of liquid rocket engine

Cold acoustic tests have been performed to elucidate the effect of baffle on the damping characteristics of the first-tangential acoustic mode in a liquid rocket engine.Different kinds of baffle parameters were researched by acoustic tests.The results agree well with the theory typical example and show that when increasing the axial baffle length and the radial baffle number,the acoustic frequency of the first-tangential acoustic mode decreases and the acoustic damping capacity increases.Injector-forming baffles have some advantages over the typical straight baffles in acoustic damping capability;an optimal acoustic damping capacitance has been achieved in 0.1~0.4mm;axial baffle length can be reduced by using the optimal baffle gap,providing a possible solution of thermal cooling problems.