大型固体发动机燃烧室立式贮存研究

Research on vertical storage of large-scale SRM chamber

为研究大型固体发动机对特殊立式贮存环境的适应性,开展了大型固体发动机立式贮存状态的受力分析以及立式贮存试验研究。基于大型固体发动机立式贮存环境条件的分析,综合考虑固化降温、充气内压等因素对发动机立式贮存的影响,开展了联合载荷作用下的计算分析。研究结果表明,发动机立式贮存状态相对初始状态前、后人工脱粘间隙都增大,前人工脱粘间隙增大较多,前人工脱粘开口部位轴向位移最大,中孔径向位移最大;发动机充气后药柱的变形量、前后凸环形药柱界面及药柱中孔处等效应力应变随内压提高有所提高,但前后凸环形药柱界面和药柱中孔处受力状态从三向或两向受拉变为三向受压状态,设计合适的充气内压有利于发动机的长期立式存放。燃烧室立式贮存试验实测了药柱立式贮存后的变形,实测结果与计算结果趋势一致。

In order to study the adaptability of large-scale solid rocket motor to the special vertical storage environment,FEM a-nalysis and experimental study were carried out. Based on the analysis of storage environment,considering the influence of curing and inner pressure on the vertical storage grain,calculation and analysis under combined loading were carried out. Calculation re-sults show that the gaps of fore and aft stress release boot become bigger in vertical storage state than that in the initial state.The gap of the fore stress release boot increase more than that of the aft one. The biggest axial displacement occurs on the opening position of the stress release boot.The biggest radial displacement of the grain occurs on the perforation.After filling gas in the motor,the de-formation of the grain,the equivalent stress/strain of the fore/aft grain interface on the root of the stress release boot and the equiva-lent stress/strain of the perforation grain increase with the applied inner pressure.However,the stress state of the fore/aft grain inter-face on the root of the stress release boot and the perforation grain transfer from three-orientation/two-orientation tensile to two-orien-tation compression,so appropriate inner pressure is advantageous to the long-term vertical storage of the motor.Finally,the vertical storage experiment was carried out and the deformation of the grain was measured. Comparison results show that the measured values agree well with the calculation values.