流体机械

2017, v.45;No.544(10) 7-11

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不同转速下液体透平的性能研究
Effect of Blade Number on Performance of Pump as Turbine

苗森春;杨军虎;王晓晖;史广泰;
MIAO Sen-chun;YANG Jun-hu;Wang Xiao-hui;SHI Guang-tai;Lanzhou University of Technology;Key Laboratory of Fluid Machinery and Systems;Key Laboratory of Fluid and Power Machinery,Ministry of Education(Xihua University);

摘要(Abstract):

为了明确转速对离心泵作液力透平的性能影响,本文基于Navier-Stokes方程和标准的湍流模型,采用SIMPLE算法,应用商业软件ANSYS-FLUENT对转速分别为750,1000,1500,2000和2900 r/min下的液力透平进行了数值模拟,得到了不同转速下液力透平的外特性曲线。结果表明:对于所研究模型而言,随着转速的不断增大,液力透平最优效率点的效率呈增大趋势,但增加梯度相对较小;最优效率点的流量与转速呈线性增加的趋势;扬程与功率均随着转速的增加而增大,其中扬程在小流量工况时增加梯度较大,而在大流量工况时增加的梯度相对较小;功率的变化规律恰好与扬程变化规律相反,即功率随着转速的增大在小流量工况时增大梯度较小,而在大流量工况时急剧上升。另外,根据不同转速下液力透平的性能特点得出:在小流量工况时,降速对提高液力透平的效率有显著作用,与之对应,在大流量工况运行时,增加转速也可以提高液力透平的能量回收能力,但前提是需要保证结构强度满足要求。总之,该研究结果可对液力透平的经济运行提供部分参考。
In order to clear the influence of the speed on performance of pump as turbine,based on Navier-Stokes equation,k-ε turbulence model and SIMPLE algorithm,the numerical simulation using commercial software ANSYS-FLUENT for the pump as turbine at different speeds(750,1000,1500,2000 and 2900 r/min was carried out. According to the result of numerical simulation under different speeds,the external characteristic curve and Internal flow characteristics of pump as turbine were obtained of pump as turbine respectively. The results show that:For the research model,with the increasing of the speed,the efficiency of the optimal efficiency of the pump as turbine is gradually increasing,but the gradient is relatively small. The flow rate and rotating speed of the optimal efficiency point is basically linear increasing trend. Both the head and the power increase with the increase of the rotating speed. The head in small flow conditions to increase the gradient is larger,and a large flow condition to increase the gradient is relatively small. The change trend of power is opposite to the change law of the head,i.e. with the increase of the power,the gradient is relatively small when the small flow rate increases,and the power of the large flow rate increases sharply with the increase of the speed. The farther away from the optimal working condition,the more serious the degree of decline in efficiency. According to the performance characteristics of pump as turbine under different rotating speeds,speed reduction has a significant effect on improving the efficiency of pump as turbine in small flow condition. In contrast to the large flow rate conditions,the premise is the need for structural strength to meet the requirements,increasing the speed is beneficial to the energy recovery of the pump as turbine. The results of the study provide a reference for the economic operation of the pump turbine.

关键词(KeyWords): 转速;泵作液力透平;数值模拟;离心泵;梯度
speed of revolution;pump as turbine;numerical simulation;pump;gradient

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51569013);; 甘肃省科技基金计划(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)

作者(Author): 苗森春;杨军虎;王晓晖;史广泰;
MIAO Sen-chun;YANG Jun-hu;Wang Xiao-hui;SHI Guang-tai;Lanzhou University of Technology;Key Laboratory of Fluid Machinery and Systems;Key Laboratory of Fluid and Power Machinery,Ministry of Education(Xihua University);

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