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仿生微凹坑表面叶片对离心泵空化性能的影响

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空化现象是影响离心泵性能的关键因素,为研究仿生微结构对离心泵空化性能的影响,以比转速为112.4的离心泵为研究对象,基于海滑虫的仿生气包微纹理表面,提出一种类蘑菇状凹坑微结构叶片.利用CFD仿真软件对模型进行非定常空化数值模拟,研究微结构不同凹坑深度比对离心泵空化性能的影响.结果表明:仿生微结构对离心泵水力性能影响较小,扬程变化为-1.42%~1.38%;不同深度比对离心泵空化性能影响较大,当深度比为2.5时,抑制空化效果最佳,在空化初生阶段空泡体积减少54.75%,断裂扬程提高17.07 m;在吸力面进口 1/3处布置仿生类蘑菇状凹坑后,减少了叶轮进口处低压区分布,减小了流道内空泡横截面积,抑制流道内空化的初生和发展.
Effect of Bionic Blade with Micro-pitted Surface on the Cavitation Properties of Centrifugal Pump
Cavitation phenomenon is a key factor affecting the performance of centrifugal pump,in order to study the effect of bionic microstructure on the cavitation performance of centrifugal pump.Taking the centrifugal pumps with a specific rotational speed of 112.4 as the research object,a class of mushroom-like pit microstructure blade is proposed based on the gas-entrapping microtextured surfaces of sea skaters.Numerical simulations of non-stationary cavitation is carried out on the model using CFD simulation software to study the effect of different pit depth ratios of the microstructure on the cavitation properties of centrifugal pump.The finding indicate that the bionic microstructure exerts a negligible influence on the hydraulic performance of centrifugal pump,with a marginal change of head:-1.42%~1.38%.Different depth ratios have a greater effect on the cavitation properties of centrifugal pump,when the depth ratio is 2.5,the best effect of inhibiting cavitation,the volume of vacuole in the incipient stage of cavitation is reduced by 54.75%,and the fracture head is increased by 17.07 m.The arrangement of bionic mushroom-like pits in front of the suction front at the first 1/3,reduces the distribution of low-pressure zone at the impeller inlet,reduces the cross-sectional area of the vacuole in the flow channel,and inhibits the incipient and development.

centrifugal pumpcavitation propertiesbionic bladenumerical simulation

林煦程、胡亚辉、李沁阳、王雨霖、陈坚

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天津理工大学 海运学院,天津 300384

天津市先进机电系统设计与智能控制重点实验室,天津 300384

离心泵 空化性能 仿生叶片 数值模拟

天津市自然科学基金天津理工大学2023校级研究生科研创新实践项目

23JCYBJC00620YJ2388

2024

液压与气动
北京机械工业自动化研究所

液压与气动

CSTPCD北大核心
影响因子:0.453
ISSN:1000-4858
年,卷(期):2024.48(10)