流体机械

2021, v.49;No.584(02) 14-22

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基于喉部参数控制的离心泵导叶扩散度研究
Study on guide vane diffusivity of centrifugal pump based on throat parameter control

胡晓东;王维军;
HU Xiaodong;WANG Weijun;AVIC Chengdu Caic Electronics Co.,Ltd.;

摘要(Abstract):

为研究导叶扩散段无量纲参数对离心泵水力性能的影响,通过控制导叶喉部参数设计出5种导叶扩散度方案,采用雷诺时均N-S方程和RNGκ-ε湍流模型对离心泵进行全流场计算,对比分析了不同扩散度方案对上游叶轮、导叶本身以及下游压水室水力性能的影响,并验证了数值分析的可靠性。研究表明:导叶扩散度对上游叶轮水力性能较大,叶轮效率随导叶扩散度的增加而增大,扩散度过小会增大叶轮出口位置液流所受冲击损失;导叶水力性能对扩散度的变化比较敏感,其水力损失随扩散度的增加而增大,且扩散度越大导叶叶片进口工作面上压力波动越剧烈、背面静压提升越明显;导叶扩散度的变化对下游压水室的水力性能影响较小,水力损失随导叶扩散度的增加先减小后增大,导叶扩散度过大会加剧压水室内液体的环流运动、降低压水室的水力性能;泵的扬程随导叶扩散度的增加而减小,效率随导叶扩散度的增加先增大后减小,导叶扩散度K_d位于0.026~0.038之间时离心泵具有较高的运行效率。
In order to study the influence of the dimensionless parameters of the guide vane diffusion section on the hydraulic performance of the centrifugal pump,five kinds of guide vane diffusivity schemes were designed by controlling the parameters of the guide vane throat,and the Reynolds time-averaged N-S equation and RNG κ-ε turbulence model were used to calculate the full flow field of the centrifugal pump,and the effects of different diffusivity schemes on the hydraulic performance of the upstream impeller,the vane itself and the downstream pressurized water chamber were compared,and the reliability of the numerical analysis was verified. The research shows that the vane diffusivity has greater effect on the hydraulic performance of upstream impeller,and the impeller efficiency increases with the increase of the vane diffusivity. If the diffusivity is too small,the impact loss of the flow at the impeller exit would be increased;the hydraulic performance of the vane is sensitive to the change of diffusivity,and its hydraulic loss increases with the increase of diffusivity,and the greater the diffusivity,the more severe the pressure fluctuation on the inlet surface of the vane blade and the more obvious the increase of the back static pressure. The change of the guide vane diffusivity has less influence on the hydraulic performance of down-stream pressurized water chamber.The hydraulic loss decreases first and then increases with the increase of the diffusivity of the guide vane.The excessive diffusivity of the guide vane will increase the circulation movement of the liquid in the pressurized water chamber and reduce the hydraulic performance of the pressurized water chamber.The head of the pump decreases with the increase of the diffusivity of the guide vane. The efficiency increases first and then decreases with the increase of the diffusivity of the guide vane.When the vane diffusivity K_d is between 0.026 and 0.038,the centrifugal pump has higher operating efficiency.

关键词(KeyWords): 离心泵;导叶扩散度;数值模拟;水力性能
centrifugal pump;vane diffusivity;numerical simulation;hydraulic performance

Abstract:

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基金项目(Foundation): 流体机械及工程四川省重点实验室(西华大学)开放课题资助项目(szjj2019-029);; 航空工业成都凯天电子股份有限公司预研项目(Y1910,Y1920)

作者(Author): 胡晓东;王维军;
HU Xiaodong;WANG Weijun;AVIC Chengdu Caic Electronics Co.,Ltd.;

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