三角形仿生微槽对离心泵定常流动影响的数值研究  

Numerical study of influence of triangular bionic microgrooves on the steady flow of centrifugal pumps

作　　者：王春贺 林培锋[1] WANG Chunhe;LIN Peifeng(Key Laboratory of Fluid Transmission Technology of Zhejiang Province,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学流体传动技术浙江省重点实验室,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2023年第2期246-253,共8页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金联合基金项目(U2006221);国家自然科学基金面上项目(51676173);浙江理工大学521人才培养计划。

摘　　要：在离心泵叶轮的上下盖板处布置三角形仿生微槽,研究该微槽对离心泵内部流动的影响。采用SST k-ω湍流模型,在不同工况下对有、无三角形仿生微槽的离心泵进行了定常数值模拟。结果发现:三角形仿生微槽结构的布置使泵的扬程和效率分别提升了约3.7%和0.8%,扩大了离心泵的稳定工作范围;在0.8~1.2倍标准流量工况下,该微槽不仅减少了叶片压力面附近的漩涡数,还削弱了漩涡强度,显著降低了离心泵叶轮叶片压力面前缘和后缘处的湍动能和拟涡能,其中叶轮流道截面处的拟涡能面平均值降幅为35.0%~78.4%。该研究表明置于叶轮盖板处的三角形仿生微槽可有效提升离心泵的扬程和效率,减小流体冲击导致的能量损耗,从而提高离心泵的内部流动稳定性。A triangular bionic microgroove was arranged at the upper and lower cover plates of the centrifugal pump impeller to study the influence of the microgroove on the internal flow of the centrifugal pump. Using SST k-ω turbulence model, the steady numerical simulations of the centrifugal pumps with and without a triangular bionic microgroove were carried out under different flow conditions. The results showed that the triangular bionic microgroove structure increased the pump head and efficiency by about 3.7% and 0.8%, respectively, expanding the stable working range of the centrifugal pump. Under the flow conditions of 0.8~1.2 times of the standard flow, the triangular bionic microgroove not only reduced the number of vortices near the blade pressure surface, but also weakened the intensity of vortices, which significantly reduced the turbulent kinetic energy and enstrophy at the leading and trailing edges of the centrifugal pump impeller blade pressure surface. The average value of enstrophy surface at the middle section of the impeller channel decreased by 35.0%~78.4%. The research shows that the triangular bionic microgroove placed at the impeller cover plate can effectively improve the lift and efficiency of the centrifugal pump, and reduce the energy loss caused by fluid impact, so that the internal flow stability of the centrifugal pump can be improved.

关 键 词：离心泵 三角形仿生微槽 定常 数值模拟 内部流动 

分 类 号：TH311[机械工程—机械制造及自动化]