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将液路计算中偏微分方程模型化成有限阶数的常微分方程组 ,由一维液体瞬变管流方程的特征线差分格式 ,提出了一种计算管腔互联结构形式的液体推进剂供应管路中瞬变流的一维有限元方法 ,它兼有特征线方法的特点。数值计算表明对单根等截面圆管阀门关断问题的计算结果与特征线方法计算结果吻合。利用本文方法计算了一个模型发动机的脉冲工况动态过程 ,取得了很好的效果。
The partial differential equations in fluid path calculation are modeled as finite-order ordinary differential equations. By the characteristic-line difference scheme of one-dimensional liquid transient flow equations, a liquid propellant supply tube One-dimensional finite element method of transient flow in the road, which combines the characteristics of the method of characteristic line. The numerical results show that the calculation results of the single-sectioned cross-section pipe valve are consistent with the calculation of the characteristic line method. By using this method, the dynamic process of a model engine in the pulse condition is calculated and good results have been achieved.