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针对一个变截面开槽管状装药单室双推力发动机，讨论如何应用三维声学有限元分析来确定燃烧室内腔的声学特性，以及在此基础上进行发动机燃烧稳定性预估的三维计算方法，目的是为研制部门提供通用的软件。应用本文编制的计算程序进行试算的结果表明：（１）燃烧室内腔前１０阶固有振型的预估误差不大于３％；（２）该发动机的燃烧稳定性接近临界状态，与地面试车情况定性一致。最后，还就声学分析的验证，减少占用内存及计算机时，以及预估方法的进一步改进等问题做了必要的讨论。
Aiming at a slotted single-chamber double-thrust tubular engine with variable section, this paper discusses how to use three-dimensional acoustic finite element analysis to determine the acoustic characteristics of the combustion chamber and the three-dimensional calculation method of engine combustion stability prediction. Is to provide general-purpose software development department. The results of the trial calculation using the calculation program show that: (1) the predicted error of the first ten natural modes in the combustion chamber is no more than 3%; (2) the combustion stability of the engine is close to the critical state, The situation is qualitatively consistent. Finally, the necessary discussions were made on the verification of acoustic analysis, the reduction of memory and computer use, and the further improvement of the estimation method.