遠心ブロワにおける非定常流れ場解析（背面隙間の効果）

（背面隙間の効果）

抄録

To improve the efficiency and to reduce the noise of centrifugal blowers, the authors investigated the flow in a vaned diffuser using compressible flow simulation. In this study, the effect of the gap between the impeller and the casing was focused on. From the results of flow simulation, it was confirmed that the reverse flow generated near the leading edge of the diffuser vanes streamed into the gap of the impeller and the casing. Additionally, the secondary flow at the semi-vaneless diffuser region which was observed in a CFD model with the gap was stronger compared to a CFD model without the gap.