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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. And it is based on two assumptions : (i) noise levels are in proportion to the relative velocities at the edge of the blade raised to the sixth power and (ii) the velocities on the outside of the fan's impeller have an especially close relation to the noise level. Computational fluid dynamics is used to obtain the necessary velocity field data for this model. It was found that the noise levels calculated by this model agree well with the measured noise levels of a test impeller. This agreement confirms that noise level of a conventional cross-flow fan can be predicted by this simple model, since relative velocity data is readily available from frequently executed computational analyses. 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, it has a lower noise level and higher performance.

nihon kikai gakkai ronbunshū. b

Prediction of Aerodynamic Noise Level of Cross-Flow Fans for Air Conditioners (2nd Report, Development of Cross-Flow Fans by means of Aerodynamic Noise Prediction Model)