基于大涡模拟的输油泵性能预测及内流场分析

Performance Prediction and Internal Flow Field Analysis of Oil Pump Based on Large Eddy Simulation

为研究输油泵的性能和内部流动特性,基于k-ω湍流模型和大涡模拟(LES)湍流模型,采用ANSYS CFX软件对设计工况下的输油泵性能进行数值模拟计算,得到了泵内压力分布图、速度流线图和相对速度分布图,并对比了k-ω湍流模型和LES湍流模型计算结果的差异。计算结果表明,LES湍流模型可以较好地预测输油泵的性能,叶轮进口处存在低压区,导叶内存在高压区。采用2种湍流模型计算得到的压力分布没有明显不同,但LES湍流模型计算得到的出口段速度流线比k-ω湍流模型的紊乱,通过LES湍流模型得到的泵内速度变化情况更贴近输油泵实际内部流动情况。

In order to study the performance and internal flow characteristics of the oil pump,based on the k-ωturbulence model and large eddy simulation(LES)turbulence model,ANSYS CFX was used to simulate the oil pump under design conditions.The maps including pressure distribution,velocity streamlines and relative velocity distribution of the pump were analyzed,and the difference between the calculation results of the k-ωturbulence model and LES turbulence model was compared.The results show that a large eddy simulation turbulence model could predict the performance of the oil pump well.There is a low-pressure area at the impeller inlet and a high-pressure area in the guide vane.The pressure distributions calculated by the two turbulence models are not significantly different,but the turbulence of the outlet section velocity line calculated by the LES turbulence model is severer than that calculated by the k-ωturbulence model.The velocity change of the oil pump from the LES turbulence model is also closer to the actual internal flow situation.