叶片进口边开孔对离心泵空化和湍动能影响的研究

Study on the influence of blade perforation near inlet edge on cavitation and turbulent kinetic energy of centrifugal pump

以某台低比转速离心泵为研究对象,提出了在离心泵叶轮入口处对叶片进行开孔的新方案,基于Realizable k-ε湍流模型和简化的Rayleigh-Plesset空化模型,研究了叶片进口边开孔对离心泵空化和湍动能的影响。对比分析了未开孔和几种不同开孔方案对离心泵性能的影响,计算得出扬程和效率并与实验数据进行对比。结果表明:在叶轮入口处最先产生空化的区域对叶片进行开孔,能够有效抑制离心泵内部空化情况的发生;4×1 mm开孔方案不仅改善了离心泵空化性能,还有助于减小湍动能耗损,使得离心泵内部流场更加稳定。

By taking a centrifugal pump with low specific speed,a new scheme of blade perforation near inlet of centrifugal pump impeller.Based on realizable k-εturbulence model and simplified Rayleigh-Plesset cavitation model,the influence of blade perforation near inlet edge on cavitation and turbulent kinetic energy of a centrifugal pump was studied.The influence of different schemes,such as non-perforation scheme and perforation scheme,on performance of centrifugal pump was compared and analyzed.The head and efficiency were calculated and compared with experimental data.The results show that the blade perforation in the first cavitation area at the impeller inlet can effectively inhibit occurrence of cavitation in the centrifugal pump;the 4×1 mm perforation scheme not only improves the cavitation performance,but also helps to reduce the turbulent kinetic energy dissipation,making the internal flow field of the centrifugal pump more stable.