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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Numerical and experimental investigation of the pressure fluctuation in a mixed-flow pump under low flow conditions
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Numerical and experimental investigation of the pressure fluctuation in a mixed-flow pump under low flow conditions

机译：低流量条件下混流泵压力波动的数值和实验研究

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摘要

In this paper, the large eddy simulation is utilized to simulate the flow field in a mixed-flow pump based on the standard Smagorinsky subgrid scale model, which is combined with the experiments to investigate pressure fluctuations under low flow conditions. The experimental results indicated that the amplitude of fluctuation at the impeller inlet is the highest, and increases with the reduction of the flow rate. The main frequencies of pressure fluctuation at the impeller inlet, impeller outlet, and vane inlet are blades passing frequency, while the main frequency at the vane outlet changes with the flow rate. The results of the simulation showed that the axial plane velocity at impeller inlet undergoes little change under 0.8Q(opt). In case of 0.4Q(opt), however, the flow field at impeller inlet becomes complicated with the axial plane velocity changing significantly. The flow separation is generated at the leading edge of the suction surface at t*=0.0416 under 0.4Q(opt), which is caused by the increase of the incidence angle and the influence of the tip leakage flow. When the impeller rotates from t*=0.0416 to t*=0.1249, the flow separation intensified and the swirling strength of the separation vortex is gradually increased, leading to the reduction of the static pressure, the rise of adverse pressure gradient, and the generation of backflow. The static pressure at the leading edge of the impeller recovers gradually until the backflow is reached. In addition, the flow separation is the main reason for the intensification of the pressure fluctuation.
机译：在本文中，基于标准Smagorinsky子网格比例模型，利用大涡模拟来模拟混流泵中的流场，并与实验相结合以研究低流量条件下的压力波动。实验结果表明，叶轮入口处的波动幅度最大，并且随着流量的减小而增大。叶轮进口，叶轮出口和叶片进口处压力波动的主要频率是叶片通过频率，而叶片出口处的主要频率随流量而变化。仿真结果表明，在0.8Q（opt）以下，叶轮入口处的轴向平面速度几乎没有变化。但是，在0.4Q（opt）的情况下，叶轮入口处的流场变得复杂，并且轴向速度明显变化。在0.4Q（opt）下，在吸力表面的前缘在t * = 0.0416处产生流分离，这是由于入射角的增大和尖端泄漏流的影响所致。当叶轮从t * = 0.0416旋转到t * = 0.1249时，流分离增强，分离涡旋的旋流强度逐渐增加，导致静压降低，逆压力梯度上升并产生回流。叶轮前缘的静压逐渐恢复，直到达到回流为止。另外，流动分离是压力波动加剧的主要原因。

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