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为了揭示头部空腔对固体火箭发动机压强振荡的抑制原理,以VKI实验发动机为基础,使用大涡模拟方法,对障碍物旋涡脱落诱发的振荡流场开展了数值研究,获得了压强振荡的频率和幅值,并和实验数据进行了对比。通过在发动机头部加入空腔,发现压强振幅明显减弱,证实了瑞利准则用于指导头部装药抑振设计的有效性。研究结果表明,空腔体积、位置、形状对振幅的影响很大,改变装药结构本质上是质量抽取与注入之间的相互抗争过程。装药头端复杂流场对抑振基本无效,在声压波节处改变药型对抑振基本无效,在声压波腹处加入的质量通量越大,振幅增加越显著,空腔越靠近声压波腹,空腔对声能的阻尼效应越强。
In order to reveal the suppression principle of head cavity on the pressure oscillation of solid rocket motor, based on the VKI experimental engine, a large eddy simulation method was used to study the oscillation flow field induced by vortex shedding. The frequency of pressure oscillation And amplitude, and compared with the experimental data. By adding a cavity into the head of the engine, the amplitude of the pressure was found to be significantly weakened, confirming the effectiveness of the Rayleigh guideline in guiding head charge suppression design. The results show that the cavity volume, location and shape have a great influence on the amplitude. Changing the charge structure is essentially the process of mutual protest between mass extraction and injection. The complex flow field at the tip of the charge has basically no effect on the vibration suppression. The change of the drug type at the node of sound pressure basically has no effect on the vibration suppression. The greater the mass flux is added at the antinode of the sound pressure, the more significant the amplitude increases. Close to the sound pressure antinode, the cavity damping effect on acoustic energy is stronger.