径向导叶对混流式核主泵水力性能的影响

The Influence of Radial Vanes on Hydraulic Performance of Mixed Flow Nuclear Main Pump

基于三维不可压缩流体的N-S方程和RNG k-ε湍流模型,采用流体计算软件ANSYS-Fluent对设计工况下,不同导叶数及导叶进口边位置的混流式核主泵水力模型的三维湍流流场进行了数值模拟,研究了导叶进口边位置及导叶数对混流式核主泵模型水力性能的影响。计算结果表明:随着导叶数的增加,当导叶数为奇数时,泵的计算扬程和水力效率值都有所增大,且水力效率值增大的趋势在减小;导叶数为偶数时,泵的计算扬程和水力效率值先减小后增大,在导叶数为16片时,泵的计算扬程和水力效率值最小。随着导叶进口边与叶轮出口边夹角θ的增大,泵的计算扬程和水力效率值先增大后减小,当θ=14°时,模型泵的水力性能最好。研究结果可用来了解混流式核主泵水力模型的内部流场特征,并为其高效水力模型优化设计提供有益参考。

Based on three-dimensional incompressible fluid N-S equations and RNG k — ε turbulence model,a numerical simulation has been applied on the study of mixed flow nuclear main pump with different vanes number and vane leading edge position,using computational fluid dynamics software ANSYS-Fluent.The results show that：with the increase of the number of vanes,when the vanes number is odd,the value calculated head and hydraulic efficiency of the pump has increased,and the hydraulic efficiency tends to increase in value is reduced;When the vanes number is even,the calculation of the pump head and hydraulic efficiency value is decreasing firstly and then increasing.In the number of vanes 16 films,both values are lowest.With the increasing of angle θ,which between leading edge of the vane and trailing edge of the impeller,both values first increase and then decrease.When the angle is 14°,the model pump of hydraulic performance is the best.This result can be used to understand the internal flow field characteristics of the mixed flow nuclear main pump hydraulic model,and provide a useful reference to optimizing design of high efficient hydraulic model.