遠心羽根車内ポテンシャル流れのパネル法による完全三次元解析

概要

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A panel method of obtaining accurate three-dimensional incompressible potential flow in a centrifugal impeller is presented. The basic equation is the surface integral representation for velocity potential based on Green's identity, which reduces to a set of linear equations by discretization procedure. Numerical calculations are performed at flow rates 100% and 75% for an impeller designed by the conventional method. The one-dimensional flow obtained by a simple one-dimensional theory, a two-dimensional calculation and the present three-dimensional one are compared to clarify the degree of approximation of each flow. The three-dimensional characteristics are investigated examining the pressure distribution along the blade elements on the hub, mid and shroud stream surfaces, the pressure contour and the relative velocity vector on the pressure and suction surfaces of the blade, the head distribution at the impeller outlet surface, and so on.
1986-12-25