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In this paper,the performances and the acoustic noise of the traditional type micro multi-blade fan were investi- gated experimentally and numerically,to optimize the specifications of the fan for the resident circumstances. The acoustic noise level decreases but the efficiency deteriorates slightly with the increase of the blade number of the impeller.Besides,the acoustic noise decreases with the increase of the distance between the impeller outlet and the volute tongue,in accompanying with the increase of the input and the deterioration of the fan efficiency.
In this paper, the performances and the acoustic noise of the traditional type micro multi-blade fan were investi- gated experimentally and numerically, to optimize the specifications of the fan for the resident cases. The acoustic noise level decreases but the efficiency deteriorates slightly with the increase of the blade number of the impeller.Besides, the acoustic noise decreases with the increase of the distance between the impeller outlet and the volute tongue, in accompanying with the increase of the input and the deterioration of the fan efficiency.