Abstract
The target mixed flow blowers are required to have high efficiency, low noise, compact size and light weight. The target mixed-flow opentype impeller under consideration deforms due to centrifugal stress, and the blade tip clearance changes. This study investigated the effect of centrifugal stress deformation on fan efficiency using fluid structure interaction analysis. Using the results of fluid analysis, the authors compared the static pressure change in the flow direction inside the impeller with and without centrifugal stress deformation. The centrifugal stress deformation of the impeller has the effect of reducing the loss at the impeller outletside by increasing the impeller outer diameter and decreasing the blade tip clearance. However, deformation due to centrifugal stress increases the tip leakage vortex loss due to the enlarged tip clearance near the leading edge.
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