Applying Circulation Control Method to Designing Centrifugal Impeller
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摘要: 采用流线曲率法求解S2流面反问题,为了考虑由于流体粘性损失造成的熵增,将Galvas的一维管流损失模型修改后应用于二维通流计算中并与主方程耦合求解,并编制了一套离心叶轮“可控涡”通流设计程序。为了探讨加入同等的欧拉功条件下不同环量分布方式对叶轮流场及性能的影响,以某给定设计目标的离心叶轮为研究对象,在满足后加载的前提下针对叶片尾缘附近环量的导数采取两种不同的分布方式进行通流设计,并进行了全三维粘性流动分析比较。结果表明:气流环量及环量沿流向的导数分别对叶片通道内的速度分布和叶片表面的载荷分布有着显著地影响。Abstract: The streamline curvature method is assessed to solve the inverse problem for the S2 stream surface. In order to consider the entropy rise caused by fluid viscosity, the duct-flow loss model by Galvas is modified and coupled with the solving of a control equation in the through-flow calculation. Finally, the through-flow design program of a centrifugal impeller based on the circulation control method is established. Furthermore, to investigate the influence of circulation distribution on the flow field of the centrifugal impeller and its performance, an impeller is designed by using two kinds of circulation distribution with a slight difference at the trailing edge. Then, 3-dimensional numerical analysis is made, and the analysis results show that the circulation distribution has a significant effect on the velocity and blade load distribution of the centrifugal impeller.
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