Abstract
In order to improve the performance of a diagonal-flow fan with low loading, the effects of solidity and aspect ratio of rotor blading have been investigated experimentally. With a decreasing aspect ratio, the effective operating range expands remarkably in the region of the lower flow rate, and the total pressure and efficiency increase there. In the case of higher solidity, the flow coefficient at stalling point changes little, notwithstanding the total pressure increases, hence a dip in performance characteristics becomes large. From the view-point of stable operation, lower aspect ratio and solidity are desirable. In addition, the validity of the present design method, which is extended from that of a high loading diagonal-flow fan, is examined.
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