抄録
The turbulent noise from the sirocco fan was predicted with the simple method of the potential theory, which is provided with the transformation of the cascade to the linear cylinders. And the flow characteristics of the impeller were examined with the experiments. The prediction of the turbulent noise was compared with the experimental results. The predicted noise levels are roughly similar to the experimental ones. The flow characteristics at the outlet of the impeller were large partial to the hub side. The partial flow condition becomes large with the flow rate. Then the noise level is varied with the flow rate in experiments.
