IGTC-57 PURELY THREE-DIMENSIONAL ANALYSIS OF A FLOW IN AN AXIAL ROTOR BY PANEL METHOD(Session B-5 Computational Aerodynamics II)

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In this paper, purely three-dimensional, incompressible, inviscid flow analysis by means of a panel method is presented for an axial-flow fan composed of a single-stage rotor. The field equation based on Green's theorem is used as the governing equation for velocity potential φ. The foundations to obtain the solution with acceptable accuracy are described, such as how to choose the particular solution to φ or how to incorporate the Kutta condition. The method is applied to a rotor of free vortex flow pattern designed by referring to the carpet diagram of NACA 65-series blades. The calculated results are compared with the two-dimensional flows calculated quasi-three-dimensionally, and the alleviation of spanwise head variation is confirmed in the purely three-dimensional calculation. Other results include pressure distributions around blade elements at hub, mid-span and shroud, and pressure contours and velocity vectors on the pressure- and suction-surfaces of the blade.
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