Prerotation Flow and Its Control in a Cross-Flow Fan

概要

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In the previous paper, the effect of angle and length of the inlet guide vane on the performance of the cross-flow fan was examined. By installing guide vane of one sheet in tongue division side in the suction region, the performance of the cross-flow fan becomes more high pressure and high efficient than the case without the guide vane. In this study, it is examined that the guide vane of several sheet is installed as a more convenient method in the suction region of the cross-flow fan. To begin with, the cause of generation of inlet prerotation flow of the cross-flow fan is investigated. Next, it is examined that the prerotation is controlled by the inlet guide vane. As the result, following fact became clear. (1) The prerotation is being generated by drawing in the inlet flow for eccentric vortex of the rotor inside, and therefore, the inlet velocity becomes non-uniform in the circumferential direction. (2) The cross-flow fan becomes a high-efficient and high pressure by controlling the prerotation using the inlet guide vane.