A Study on Performance Inprovement of Cross-Flow Fan by Inlet Guide Vanes.

Abstract

This paper describes the effect of inlet guide vanes on the performance of a cross-flow fan. The prewhirl in the opposite direction to a rotor rotation is generated by the inlet guide vanes. The pressure coefficient of the cross-flow fan increases with increase of guide vane angle γ, because of the increase of Euler's head in the suction cascade of the rotor. In case of γ=30∼50 degrees both efficiency and pressure coefficient are higher than those of the rotor without guide vanes. Moreover, it is found that a cross-flow fan without guide vanes also has a considerable prewhirl at the rotor inlet.