4124 騒音予測モデルを用いた貫流ファンの低騒音化(G05-11 翼・翼列,G05 流体工学)  [in Japanese] 4124 Development of Cross-Flow Fans by means of Aerodynamic Noise Prediction Model  [in Japanese]

A model for predicting the noise level of cross-flow fans has been developed. This model uses the relative air-flow velocities on the outside of the fan's impeller. Computational fluid dynamics is used to obtain the velocity field data for this model. A validity of this prediction model was confirmed from functional analysis fo the relative velocities and frequency. Then, it was found that the noise levels calculated by this model agree with the measured noise levels. Accordingly, the predicted noise level was then applied in the design of a new cross-flow fan. This new cross-flow fan has a velocity field that produces a quiet flow. As a result, noise level is decreased 2.0dB [A] at flow rate 0.5.