离心泵叶片设计经验系数取值范围分析

通过Fluent软件,运用雷诺时均方程和标准k-ε湍流模型并结合SIMPLEC算法对半螺旋型吸水室的双吸离心泵在设计过程中出现的经验系数取值范围偏大的问题进行三维全流道数值模拟。由模拟结果计算得出了不同流量下各流线上经验系数的值,经比较发现,设计阶段使用的经验公式中经验系数的取值较大,从而对同种类型的泵,可适当缩小经验系数的取值范围;同时,由模拟结果计算了所选用的泵在大流量下叶轮进口边各流线处的冲角,以此分析了该泵在大流量下的运行状况,发现该泵不宜在大流量下工作。

Analysis of Empirical Coefficient Scope to the Design of Blade in Centrifugal Pump

In order to research the problem that the value of empirical coefficient appears too large in the design of the double suction centrifugal pump using semi-spiral suction chamber,Reynold time-average equation,standard k-εturbulence mode and the SIMPLEC algorithm were employed to simulate the models.In the simulation result,the value of empirical coefficient under different flow and streamline was calculated.In comparison with the value of empirical coefficient appearing in empirical formula,we found that the scope of empirical coefficient is large for the pump of this type and can be properly narrowed.Meanwhile,the blade angle of attack was calculated under large flow and different streamline to analyze the running states,the result indicated that the pump is not suitable to work in large flow.