摘要
该文对初始稳定流开始的液流通过节流孔的过渡过程进行了数值解析计算。压力差为阶跃变化的情况下数值计算结果说明了收缩部的断面积的时间变化减少了收缩部的惯性效果。流量变化时收缩部的断面积也变化 ,而收缩部的平均流速保持一定 ,所以收缩部的惯性对系统的动特性没有什么影响 ,为了迅速地对流量的动特性进行仿真 ,本文提出了简单易算的等效惯性长公式。理论模型和数值计算结果一致。
The transient flow through a pipe orifice starting from an initial steady flow has been studied via numerical analysis. Time dependent calculation for a suddenly imposed pressure gradient has shown that variation of the cross sectional area reduces inertial effect in the contraction flow region. The flow rate change results in the variation of the cross sectional area of the contraction flow region, while the mean velocity in the contraction region remains constant, so the inertia of contraction flow region has little influence upon the dynamic behavior of the system. In order to simulate the dynamic behavior of the flow rate rapidly, this paper gives a simple formula equivalent inertial length. The theoretical model shows a good agreement with result from numerical analysis.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2003年第3期302-305,共4页
Chinese Journal of Hydrodynamics
基金
国家自然科学基金 ( 6 0 0 74 0 32 )
