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为研究无导叶对旋轴流叶轮联立流道的内部流场特性及前后叶轮之间的流场干涉情况,本文应用标准k-ε紊流模型和SIMPLEC算法进行了定常三维紊流流场的数值模拟,得到了叶片吸力面与压力面、联立流道下轮毂与轮缘位置轴向剖分的周向截面的压力等值线图及速度矢量分布图,以此直观地认识无导叶对旋轴流叶轮内部流动的耦合与干涉机理。由数值模拟获得的前置叶轮进口前、前后叶轮中间干涉面、后置叶轮出口后过流截面的压力和环量分布,根据本文给出的外特性预测方法可以获得前置叶轮、后置叶轮及联立对旋轴流叶轮各自的外特性,为评价反问题设计结果提供有效的预测手段。
In order to study the internal flow field and the flow field interference between the impeller and the impeller, the standard k-ε turbulence model and the SIMPLEC algorithm are used to simulate the three-dimensional turbulent flow field , The pressure contour and velocity vector distribution of the axial cross section of the suction side and the pressure side of the blade and the axial separation between the hub and the rim of the parallel runner are obtained. Coupling and Interference Mechanism of Leaf - Rotary Axial Flow Impeller Internal Flow. The pressure distribution and annular distribution of the cross section of the front impeller before and after the impeller is obtained by numerical simulation, the interference between the front impeller and the rear impeller at the outlet of the impeller are obtained. According to the prediction method of the external characteristic given in this paper, the front impeller, And the counter-rotating axial-flow impeller of the respective external characteristics, to evaluate the design of inverse problems provide an effective means of forecasting.