遠心ブロワ用スリットディフューザの高効率低騒音化に関する研究

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  • A Study on High Efficiency and Low Noise of a Diffuser Vanes with Slits for a Centrifugal Blower

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In order to improve the efficiency and decrease the noise level of centrifugal blowers at the same time, we have developed a “slit diffuser” which has a slit structure that connects the flow passages of neighboring diffuser vanes. We investigated the influence of slit structure in terms of performance, internal flow field, as well as noise level. We obtained the following conclusions. Compared with non-slitted diffusers, for the diffusers with slits, the stagnation area generated from the diffusers decreases near the slits and there is less diversion of the mainstream flow. Owing to the flow that goes through the slits from the pressure side to the suction side, the stagnation inside the diffuser is improved and the adiabatic efficiency increases by 0.8%. Compared with non-slitted diffusers, it is possible with slit diffusers to reduce the blade-passing frequency noise and to suppress the acoustic resonance.

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