中文摘要：

为了更深入地研究高速离心泵进口段的回流漩涡对流场的不利影响,通过在诱导轮进口前方设置孔板,可以有效地减少高速离心泵回流漩涡的危害。初步对传统形式孔板进行了分析,从而设计了3种不同形式的新型孔板。利用ANSYS-CFX软件,基于RNG k-ε模型对某一高速离心泵进行数值模拟,分析4种不同形式的孔板对回流漩涡的控制效果。通过分析进口段的流线和速度矢量变化情况,对比孔板对诱导轮叶轮压力和内部流场的影响,并对不同孔板形式的性能曲线进行分析。计算结果表明：C型孔板即上半剖抛物线形孔板能较好地改善回流漩涡,减少诱导轮叶轮的低压区域,对高速泵的水力性能有一定的提高。

英文摘要：

In order to study the negative effect of backflow vortex in depth, we try to prove that an orifice plate in front of the inducer can decrease the harm caused by backflow vortexes. Preliminary forms of traditional plates were analyzed. Three new types of orifice plates were designed for comparison. The number of a high-speed centrifugal pump was simulated based on ANSYS-CFX software and RNG k-ε Four different forms of orifice plate were analyzed whether it can control the backflow vortex or not. Import flow and the velocity vector in import section were analyzed. The performance curves of different orifice plate were analyzed. C type orifice can improve the backflow vortex by a comprehensive comparison and analysis, which can decrease the low pressure area of backflow vortex and improve the hydraulic performance of high-speed pumps.