叶片角度对采用肘形流道的轴流泵装置特性的影响
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摘要
基于RNG k-ε湍流模型和雷诺时均N-S方程,运用CFD技术对采用肘形流道的某泵站轴流泵装置分别在叶片角度为-2°,0°和+2°时进行三维流动数值模拟,以探究不同叶片角度下肘形流道的流动特性,以及肘形流道与叶片角度对轴流泵装置性能的影响,并对肘形流道内进行了非定常计算。通过计算得到叶片角度对肘形流道内水流流动状态会产生影响,叶片角度的不同导致肘形流道内的流态也会不同,不同叶片角度下叶轮进口的流速均匀度也会产生差异。在不同叶片角度下,轴流泵装置的肘形进水流道内压力脉动同样会产生很大的差异,压力脉动的差异会对机组的振动产生影响,通过对比叶片角度对采用肘形流道的轴流泵装置特性的影响,可以为工程中轴流泵装置叶片角度的调节提供一定的参考。
Based on the RNG k-ε turbulence model and the Reynolds time-averaged NS equation,the CFD software was used to carry out three-dimensional flow numerical simulation on the axial flow pump device with the elbow flow passage at a pumping station at-2°,0°,and +2°respectively,in order to investigate the flow characteristics of the elbow flow passage at different blade angles,and the influence of elbow flow passage and blade angle on the performance of the pump device,and the unsteady calculation was carried out for the elbow flow passage. The blade angle obtained by calculation would have a great influence on the flow state of the flow in the elbow flow passage.Different blade angles would result in different flow patterns in the elbow flow passage,and the uniformity of flow velocity at the impeller inlet would be different at different blade angles.At different blade angles,the pressure pulsation in the elbow inlet flow passage of the axial flow pump device would also produce a big difference. The difference in pressure pulsation would affect the vibration of the unit. By comparing the influence of the blade angle on the characteristics of the axial flow pump device with elbow flow passage,it can provide a certain reference for the adjustment of blade angle of the axial flow pump device in the project.
Based on the RNG k-ε turbulence model and the Reynolds time-averaged NS equation,the CFD software was used to carry out three-dimensional flow numerical simulation on the axial flow pump device with the elbow flow passage at a pumping station at-2°,0°,and +2°respectively,in order to investigate the flow characteristics of the elbow flow passage at different blade angles,and the influence of elbow flow passage and blade angle on the performance of the pump device,and the unsteady calculation was carried out for the elbow flow passage. The blade angle obtained by calculation would have a great influence on the flow state of the flow in the elbow flow passage.Different blade angles would result in different flow patterns in the elbow flow passage,and the uniformity of flow velocity at the impeller inlet would be different at different blade angles.At different blade angles,the pressure pulsation in the elbow inlet flow passage of the axial flow pump device would also produce a big difference. The difference in pressure pulsation would affect the vibration of the unit. By comparing the influence of the blade angle on the characteristics of the axial flow pump device with elbow flow passage,it can provide a certain reference for the adjustment of blade angle of the axial flow pump device in the project.
引文
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[2]郑源,刘君,周大庆,等.大型轴流泵装置模型试验的压力脉动[J].排灌机械工程学报,2010,1(28):51-55.
[3]杨帆,刘超,汤方平,等.箱涵式进水流道的立式轴流泵装置水动力特性分析[J].农业工程学报,2014,30(4):62-69.
[4]刘超,成立,周济人,等.水泵站开敞进水池三维紊流数值模拟[J].农业机械学报,2002,33(6):53-55.
[5]成立,刘超,周济人.基于RNG湍流模型的双向泵站出水流道流动计算[J].水科学进展,2004,15(1):109-112.
[6]黄欢明,高红,沈枫,等.轴流泵内流场的数值模拟与试验[J].农业机械学报,2008,39(8):66-69.
[7]刘超,梁豪杰,金燕,等.立式轴流泵进水流场PIV测量[J].农业机械学报,2015,46(8):33-41.
[8]宋希杰,刘超,杨帆,等.水泵进水池底部压力脉动特性试验[J].农业机械学报,2017,48(11):196-203.
[9]王福军,张玲,张志民,等.轴流泵不稳定流场的压力脉动特性研究[J].水利学报,2007,38(8):1003-1009.
[10]郭楚,郑源,周大庆,等.导叶叶片数及导叶相对位置对低扬程轴流泵装置性能的影响[J].排灌机械工程学报,2019,37(3):204-210.
[11]宋希杰,刘超,罗灿,等.轴流泵装置中侧壁旋涡特性及消涡研究[J].流体机械,2018,46(6):27-32.
[12]张德胜,施卫东,张华,等.不同湍流模型在轴流泵性能预测中的应用[J].农业工程学报,2012,28(1):66-70.