溢流阀环形槽抗气穴性能分析及优化设计

Analysis and optimization of resistive cavitation property of annular groove within relief valve

采用RNGk-ε湍流模型数值模拟溢流阀环形槽口的气穴流动现象,并分析环形槽各结构参数对阀腔内气穴流场的影响。结果表明,结构参数θ越大,参数R1和R2取值最优时,抗气穴性能更明显。根据环形槽结构参数的数值模拟数据,利用kriging模型方法得出代理函数,即以阀腔内最大气体体积分数为目标函数,以Gauss函数为相关函数,采用常数回归模型的似然函数。利用改进PSO算法对代理函数进行优化计算,经对比得出优化参数的抗气穴性能显著。

RNG k-ε turbulence model is adopted to simulate the cavitating flow of annular groove within relief valve,and the influence of structural parameters of annular groove on cavititaing flow field is analyzed.The analysis results show that performances of resistive cavitations increase with the rising of structural parameter θ when structural parameters R1and R2 are the optimal values.According to numerical simulation data of annular groove’s structural parameters,the surrogate models is obtained via the kriging calculated method,i.e.the objective function is the maximum gas volume fraction,the correlation function is the Guass function and constant regression model is applied to the likelihood function of surrogate models.The surrogate function is optimized by the improved PSO algorithm,and resistive caviatation property of the optimized structural parameters has higher efficiency compared with other ones.