微型高速泵小流量工况空化特性数值分析

发布时间：2018-04-03 19:09

本文选题：微型高速离心泵　切入点：数值模拟　出处：《热能动力工程》2017年08期

【摘要】：通过CFturbo与UG软件建立及优化模型,基于RNG k-ε湍流模型和Rayleigh-Plesset空化模型,利用CFX(计算流体力学)软件对微型高速离心泵进行数值模拟。通过小流量和不同进口总压工况,对叶轮进口段流动特性、叶片表面和叶轮流道的静压分布以及叶轮流道内空泡数分布3个方面进行流场分析。结果表明:流量对叶轮进口段回流影响较大;叶片前缘到后缘的压力逐渐增大,叶轮流道进口到出口的压力也逐渐增加;扬程系数陡降前的振动是叶轮空化不稳定引起的,随着空化系数的降低,空泡体积数逐渐占据整个叶轮流道,空泡分布也由不对称转变为对称结构;为微型高速泵的设计和研究提供了理论基础。
[Abstract]:Based on the RNG k- 蔚 turbulence model and Rayleigh-Plesset cavitation model, the numerical simulation of micro high speed centrifugal pump is carried out by using CFX (Computational fluid Dynamics) software.Through small flow rate and different inlet total pressure conditions, the flow field of impeller inlet section, the static pressure distribution of blade surface and impeller passage, and the distribution of cavitation number in impeller runner are analyzed in three aspects: flow characteristics of impeller inlet section, static pressure distribution of blade surface and impeller runner and distribution of cavitation number in impeller runner.The results show that the flow rate has a great influence on the reflux of the inlet section of the impeller, the pressure from the front edge to the rear edge of the blade increases gradually, and the pressure from the inlet to the outlet of the impeller passage increases gradually, and the vibration before the steep drop of the lift coefficient is caused by the cavitation instability of the impeller.With the decrease of cavitation coefficient, the cavitation volume number gradually occupies the whole impeller flow channel, and the cavitation distribution changes from asymmetry to symmetrical structure, which provides a theoretical basis for the design and research of micro high speed pumps.
【作者单位】：西华大学能源与动力工程学院;
【基金】：国家自然科学基金项目(51678508) 四川省科技厅项目(2016JY0187) 四川省教育厅重大培育项目(14CZ0013) 流体及动力机械教育部重点实验室开放基金(szjj2016-003) 西华大学研究生创新基金项目(ycjj2017207)
【分类号】：TH311

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