新型吸水室改善汽蚀性能的数值模拟与实验研究

为了改善离心泵汽蚀性能,结合喷射技术改进吸水室结构。选用IS100-80-160单级离心泵为原模型,基于RNGκ-ε、均质多相模型和Rayleigh-Plesset方程,对改进模型与原模型的流场进行CFD数值模拟。数值模拟所得到的汽蚀特性曲线与试验结果吻合较好,验证了计算方法的准确性。研究结果表明:在不同工况下,改进后的泵汽蚀余量NPSH r均低于原模型,最大降低了0.72 m,离心泵的汽蚀性能提高了33.49%,改善效果非常可观。相比于原模型,改进后的离心泵的流量与扬程有所下降,但在合理范围之内。

Numerical Simulation and Experimental Research of Cavitation Performance Improvement for New Suction Chamber

To improve the cavitation performance of centrifugal pump, the structure of suction chamber was updated through jetting technology. The centrifugal pump IS100-80-160 was selected as original model, on the basis of RNG K- ε turbulence model, homogeneous multiphase model and Rayleigh -Plesset equation, the flow field of centrifugal pump with different suction chambers were simulated with CFD. The trend of simulated NPSH-Q curves were consistent with the experimental data, in addition, the accuracy of numerical simulation was also verified. The results show that under different conditions, compared with original model, the NPSH of updating model is lower, most drop range is 0.72 m, and cavitation performance of centrifugal pump is improved by 33.49%. But the head and efficiency of updating model decline slightly within reasonable range.