Abstract
In order to improve the unstable characteristics of a high specific speed diagonal-flow fan, the effect of design angle of attack on the performance characteristics has been investigated experimentally. In the design of blade elements, two kinds of design angle of attack were specified ; the one corresponding to an optimum incidence angle and the other beeing lower angle of attack near to a negative stall angle. According to the performance test, the rotor with a low design angle of attack indicated a postponement of stall in a low flow range and fan efficiency was improved there. The design method with variable angle of attack extends the degree of freedom and it is effective when off-design conditions have to be taken into consideration in the design of a diagonal-flow fan.
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