数值仿真在泵阀参数优化中的应用

采用RNGk—ε湍流模型、动网格技术以及用户自定义程序，对往复泵泵阀的启闭过程进行了非定常数值仿真，得出了不同弹簧因素下、阀门从开启到关闭的过程中，阀芯的升程随时间的变化规律、阀的迟滞关闭时间以及阀芯落座的瞬时速度．仿真结果表明，在同时保证阀芯有较大的开启度和较短的滞后关闭时间时，弹簧刚度和预紧力因素之间存在着最佳组合：k=10N／cm，f=15N；同等地改变预紧力比改变弹簧刚度，对阀门的运动影响更大．设计了往复泵泵阀试验台；通过对往复泵进行性能测试，对不同弹簧预紧力下阀门升程进行了测定，验证了仿真结果的合理性．该仿真方法对往复泵泵阀参数优化具有一定的借鉴意义．

Application of numerical simulation in optimizing parameters of reciprocating pump valve

In order to optimize the spring of the reciprocating pump valve and establish the best spring factor matching, the unsteady opening-closing process of the poppet valve was simulated. The simulation based on computational fluid dynamics approach, and the dynamic-grid technology and User Defined Function was conducted to depict the law of motion of the poppet valve. The simulation results show that the spring stiffness and initial force have important effect on the poppet valve＇s opening displacement, the delay-closing time and the closing velocity, and there must be an optimal matching between those two spring factors. With the help of performance test of reciprocating pump, the design for the spring was validated. An experiment-bed was also built to test the poppet valve＇s lift displacement. The testing results prove that the simulation was in a correct way. The research method could be applied in the designing and optimizing of reciprocating pump valve.