将药柱贴壁浇注的固体火箭发动机燃烧室简化为中间管型药两端容腔的形式,建立了突变截面H型声腔的物理模型,求解了此种声腔纵向振频的理论解和有限元解,以对称声腔与非对称声腔为对象,分析了一些关键几何尺寸对纵向声振频率变化的影响规律.计算结果表明,声振频率受装药长度与燃烧室长度的比值、装药内外径比值以及药柱浇注位置的共同影响.从合理的装药装填率考虑,初始振荡频率小于圆柱型声腔的振频,并随燃面退移连续增大. The solid rocket motor combustion chamber with the sticking of the medicine stick is simplified to the form of the cavity at both ends of the intermediate tube type. The physical model of the H-type acoustic cavity with the abrupt cross section is established and the theoretical solution and finite element The effects of some key geometric dimensions on the longitudinal vibration frequency are analyzed.The results show that the acoustic vibration frequency depends on the ratio of charge length to combustion chamber length, Ratio and the position of pouring of grain.The initial oscillation frequency is less than the vibration frequency of the cylindrical sound cavity and increases continuously with the combustion surface retrofitting.