Design Method of the Axial-Flow Blade Row on Modified Isolated Aerofoil Theory with Interference Coefficient : Part 2,The Influence of the Aerodynamic Parameter on the Fan Performance at Low Rate

概要

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The influence of the blade aerodynamic shape such as aspect ratio, solidity, hub-tip ratio and flow pattern on the fan performance in the off-design points has been investigated. From the experimental results, the following conclusions have been obtained. The fan stall point was moved to smaller flow rate for the blading with smaller aspect ratio because the adverse pressure gradient over the blade chord became small, and the blading with large solidity showed a remarkable total pressure rise across the impeller. Generally speaking, the sector type blade was effective to avoid the blade stalling in the blade tip. When the hub ratio is large, the fan performance is influenced by the blading geometry and the maximum efficiency decreases slightly owing to an increase in annulus loss. Design flow pattern and the shape of profile have slight influence on the fan performance.
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