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基于一维管路瞬变流理论,利用特征线有限差分法,建立了推进剂供应系统管路充填过程的数学模型.利用坐标变换方法,将管路内液体与时间相关的求解区域变换为求解较方便的固定求解区域,很好地处理了模型的移动边界问题.对由贮箱、隔离阀、管道组成的系统充填过程进行了仿真计算,并将计算结果与传统的采用特征线方法获得的结果进行对比分析,验证了方法的有效性.进一步研究了最大压力峰值的影响因素,结果表明:增多初始气体压力、减小贮箱压力、增多多变指数可有效减小最大压力峰值.
Based on the theory of transient flow in one-dimensional pipeline, a mathematic model of pipeline filling process of propellant supply system is established by finite-difference method of characteristic line. By using coordinate transformation method, the solution area of liquid- Which is more convenient and fixed to solve the problem and deal well with the moving boundary problem of the model.Finally, the process of system filling consisting of tank, isolation valve and pipeline is simulated and compared with the traditional method of using characteristic line The results show that the method is effective and the influencing factors of the maximum pressure peak are further studied.The results show that the maximum pressure peak can be effectively reduced by increasing the initial gas pressure, reducing the pressure in the tank and increasing the variability index.