往复泵水头损失及空化现象的数值仿真优化

为减轻往复泵的水头损失及空化现象，以提高吸入性能，根据魏斯特法尔理论分析了泵阀运动特性，基于阀盘结构和活塞冲次等参量，提出了水头损失和空化量的优化模型。采用Fluent动网格技术进行动态数值模拟，分析了各参量对吸入过程水头损失和空化现象的影响及其发展过程，优选出了最佳阀盘结构参数和活塞冲次，可有效减小液缸内的水头损失，降低因阀盘开启滞后而产生的空化现象，改善泵的吸入性能和汽蚀现象。得出了往复泵吸入过程水头损失最小、活塞端面的空化量最小时的阀盘锥角及最优的工作冲次，为往复泵的吸入特性研究提供了参考依据。

Numerical Simulation Optimization of Head Loss and Cavitation for Reciprocating Pump

In order to reduce head loss and cavitation of reciprocating pump and improve suction performance, motion characteristics of pump valve are analyzed according to the Westphal theory. Based on the parameters of valve disc structure and piston stroke, an optimization model of head loss and cavitation is proposed. By the Fluent dynamic mesh technology, a dynamic numerical simulation of the model is performed. The influence of various parameters on head loss and cavitation during suction process and its development process is analyzed, and the optimal valve structure parameters and piston stroke are optimized. A utility model can effectively reduce the head loss in a liquid cylinder, reducing the cavitation which is caused by opening delay of valve plate, and improving the suction performance and the cavitation phenomenon of the pump. The minimum head loss in the suction process of reciprocating pump, the valve disc cone of the minimum cavitation of piston end and the best working stroke are obtained, which provide a reference for study of suction characteristics of reciprocating pumps.