スクロールレス遠心ファンの空力特性と騒音に関する研究 : 羽根車入口・出口角度の影響

概要

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The influence of the inlet and outlet angles of the centrifugal fan without scroll casing were investigated in relating to the characteristics of aerodynamics and noise. The following results are obtained. The inlet angle of the impeller, which is estimated by the radial inflow condition, gives the extremely low angle for the inflow condition. The cause is that the leakage flow from the clearance between the front shroud and the bell mouth is very large and has the tangential component of velocity. And we proposed the new charts of the performance on the fan noise. They clearly indicate the effect of the inlet and outlet angles of the impeller to the performance of the fan noise. From the charts, the optimal design parameters and the sensitivity of them to the fan noise can be easily obtained.