축류형 팬의 공기역학적 성능 및 소음 예측방법

Proposed is a prediction method for analyzing both the aerodynamic performance and the noise of axial flow fan. Fan aerodynamic performance is predicted by combining pitch-averaged quasi 3-D flow analysis and pressure loss models for blade boundary layer and wake, secondary flow, end wall boundary layer and tip leakage flows. Fan noise is assumed to be radiated as dipole distribution, and the noise generation is assumed to be mainly due to the vortex street shed from blade trailing edge. The fluctuating pressure and lift on the blade surface are analyzed by incorporating the wake vortex street model with thin airfoil theory. The aero-acoustic performance prediction results by the present method are in good agreement with the measured results of several axial fans.