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首页> 外文期刊>International Journal of Fluid Machinery and Systems >The Numerical Simulation of Unsteady Flow in a Mixed flow Pump Guide Vane
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The Numerical Simulation of Unsteady Flow in a Mixed flow Pump Guide Vane

机译：混流泵导叶内非定常流动的数值模拟

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摘要

In order to investigate the characteristics of unsteady flow in a mixed flow pump guide vane under the small flow conditions, several indicator points in a mixed flow pump guide vane was set, the three-dimensional unsteady turbulence numerical value of the mixed flow pump which is in the whole flow field will be calculated by means of the large eddy simulation (LES), sub-grid scale model and sliding mesh technology. The experimental results suggest that the large eddy simulation can estimate the positive slope characteristic of head & capacity curve. And the calculation results show that the pressure fluctuation coefficients of the middle section in guide vane inlet will decrease firstly and then increase. In guide vane outlet, the pressure fluctuation coefficients of section will be approximately axially symmetrical distribution. The pressure fluctuation minimum of section in guide vane inlet is above the middle location of the guide vane suction surface, and the pressure fluctuation minimum of section in which located the middle and outlet of guide vane. When it is under the small flow operating condition, the eddy scale of guide vane is larger, and the pressure fluctuation of the channel in guide vane being cyclical fluctuations obviously which leads to the area of eddy expanding to the whole channel from the suction side. The middle of the guide vane suction surface of the minimum amplitude pressure fluctuation to which the vortex core of eddy scale whose direction of fluid's rotation is the same to impeller in the guide vane adhere.
机译：为了研究小流量工况下混流泵导流叶片的非定常流动特性，在混流泵导流叶片上设置了几个指示点，该混流泵的三维非定常湍流数值为通过大涡模拟（LES），子网格比例模型和滑动网格技术可以计算出整个流场中的水流。实验结果表明，大涡模拟可以估算扬程和流量曲线的正斜率特征。计算结果表明，导叶进口中段压力波动系数先减小后增大。在导叶出口，截面的压力波动系数将近似为轴向对称分布。导叶入口的截面压力波动最小值在导叶吸入表面的中间位置上方，而导叶中部和出口位于其中的截面压力波动最小值。在小流量工况下，导流叶片的涡流规模较大，导流叶片中通道的压力波动明显为周期性波动，导致涡流面积从吸力侧扩展到整个通道。最小振幅压力波动的导流叶片吸入表面的中部，涡流的涡旋核（流体的旋转方向与导流叶片中的叶轮相同）粘附在该涡旋核上。

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