关键词: 双脉冲固体火箭发动机 隔舱 运动过程 仿真 试验

Abstract: Compared with traditional one, dual pulse solid rocket motor with energy management characteristic has more complex structure, which makes it difficult to study its dynamic feature. In order to improve its reliability, numerical simulation and experimental study were carried out for the debris movement process of pulse separation device. Firstly, based on LS-DYNA, monitoring function, logic-switching function and load driving function were used in the analysis to simulate the continuous force of gas flow on debris. With the method above, the spatial distribution of debris at different times, the position of impact area and the internal damage of the motor were simulated completely, which ensures the high fidelity approximation of the moving process of debris. Meanwhile, in order to verify the accuracy of simulation, the dynamic characteristics of the debris were obtained by firing tests simulating the initial operation of the second pulse motor. It was found that the simulation results of the impact location and damage degree of debris were in good agreement with the test, and the prediction error of the impact location was less than 9%, which proved that the model established was correct. Consequently, the model suitable for analyzing the whole moving process of pulse separation device of dual pulse solid rocket motor was systematically proposed.

Key words: dual pulse solid rocket motor; pulse separation device; moving process; numerical simulation; experimental study