无轴式磁悬浮离心泵水动力性能研究  

Study on hydrodynamic performance of shaftless magnetic suspension centrifugal pump

作　　者：刁伟成 陈肇麟 王贝易 丁强 孙涛 DIAO Weicheng;CHEN Zhaolin;WANG Beiyi;DING Qiang;SUN Tao(School of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Shengyi Semiconductor Technology(Wuxi)Co.,Ltd.,Wuxi 214000,China)

机构地区：[1]南京航空航天大学航空学院,南京210016 [2]盛奕半导体科技(无锡)有限公司,江苏无锡214000

出　　处：《流体机械》2025年第3期44-51,共8页Fluid Machinery

基　　金：中央高校基本科研业务费专项资金资助项目(NS2023006);国家自然科学基金项目(12032011);国家自然科学基金青年科学基金项目(12002161)。

摘　　要：为了实现无轴式磁悬浮离心泵的稳定运行,对悬浮转子的受力展开研究。采用数值计算结合试验验证的方法,对离心泵运行时的内部流场进行计算,重点研究离心泵在不同入口流量工况下,离心泵所受径向力、轴向力随时间的变化,同时探究悬浮转子内部阀片高度、转子入口直径对转子受力的影响。结果表明,离心泵在转速7 000 r/min、流量低于43.3 L/min时,离心泵悬浮转子在旋转中心处形成稳定涡核,低压区均匀分布,转子水力激振力呈稳定周期性波动;流量为75.0 L/min时,涡核破碎,转子旋转中心处低压区随时间无规则变化,转子水力激振力无规则波动,且波动幅值较高;内部阀片高度对径向力影响可以忽略,但是对轴向力影响显著,在入口流量为65.0 L/min时,阀片高度平均每增加1 mm,转子所受轴向力下降20 N;转子入口直径对转子受力影响较小,但是在高流量65.0 L/min时,D+1模型效率比D模型提高了2.1%。研究结果可为优化离心泵结构参数,减小悬浮转子受力,提高离心泵水力性能提供指导。In order to achieve stable operation of a shaftless magnetic suspension centrifugal pump,this study investigates the hydrodynamic forces acting on the suspended rotor through numerical simulations and experimental validation.The internal flow field was analyzed under varying inlet flow rates,focusing on temporal variations of radial and axial forces.Additionally,the effects of valve plate height and rotor inlet diameter on rotor forces were examined.Results demonstrate that at 7000 r/min with flow rates below 43.3 L/min,a stable vortex core forms at the rotor center accompanied by uniform low‑pressure distribution,yielding periodic hydraulic excitation forces with amplitude stability.At 75.0 L/min,vortex breakdown induces chaotic low‑pressure fluctuations and irregular high‑amplitude force oscillations.Valve plate height negligibly affects radial forces but significantly influences axial forces,showing a 20 N reduction per 1 mm height increase at 65.0 L/min.Although rotor inlet diameter minimally impacts force characteristics,the D+1 configuration improves efficiency by 2.1%than D configuration at high flow rate of 65.0 L/min.These findings provide critical guidelines for optimizing pump geometry to minimize rotor loads and enhance hydraulic performance.

关 键 词：磁悬浮离心泵 入口流量 阀片高度 轴向力 涡核 

分 类 号：TH311[机械工程—机械制造及自动化]