流体机械2018，Vol.46Issue(1)：1-5,5.DOI:10.3969/j.issn.1005-0329.2018.01.001
叶片数对泵作液力透平的性能影响
Effect of Blade Number on Performance of Pump as Turbine
摘要
Abstract
The number of blades is one of the main geometrical parameters of the pump for the hydraulic turbine. In order to make clear the influence of the number of blades on the performance of the pump for the hydraulic turbine,based on N-S equation and standard k-ε turbulence model,using SIMPLE algorithm,the flow field simulation software Fluent was applied to the numerical calculation of the pump for different blade numbers. The external characteristic curves of the hydraulic turbine with different blade numbers were obtained and the internal flow pattern was analyzed. Results show that with the gradual increase of the number of blades,the flow rate decreases from the maximum efficiency point to the small flow rate,and the efficiency is increased at first and then decreases. In addition,the maximum efficiency point of the hydraulic turbine is offset to the small flow rate. With the change of the number of blades,the pressure head is relatively small,but the increase of the number of blades increases with the increase of the number of the large flow condition. Internal flow field analysis showed that with the gradual increase of the number of blades,the vortex area of the turbine impeller is gradually reduced,and the flow inside the impeller is greatly improved. However,the increase of the number of blades increases the friction loss on the surface of the blade. Therefore,for the specific parameters of the combination of hydraulic turbine,there is the best number of blades makes the performance of the pump for the hydraulic turbine to achieve the best.关键词
叶片数/泵作液力透平/数值计算/漩涡/摩擦损失Key words
blade number/pump as turbine/numerical calculation/vortex/friction loss分类
机械制造引用本文复制引用
苗森春,杨军虎,王晓晖,史凤霞,史广泰..叶片数对泵作液力透平的性能影响[J].流体机械,2018,46(1):1-5,5.基金项目
国家自然科学基金资助项目(51569013) （51569013）
甘肃省科技基金计划(17JR5RA110) （17JR5RA110）
流体及动力机械教育部重点实验室(西华大学)开放基金项目(szjj2017-091) （西华大学）
