Abstract
The multi-blade fan is used for an air conditioner widely because of the high flow rates and high pressure as compared to its size. For the permeation of the multi-blade fan, the noise reduction would required as the comfortable air conditioning supplier. The purpose of our development is to decrease the noise of multi-blade fan used for air conditioner. In the present study, we assembled a small pressure sensor on the fan blade directly, and we measured a pressure fluctuation on the blade surface. And we discussed the relations of a pressure fluctuation between the blades and the noise generation. As a result, a remarkable pressure fluctuation was observed before the tongue passage and was able to confirm that pressure fluctuation were different by flow rate.
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