Pre-Whirl Flow and Its Control in a Cross Flow Fan

概要

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In a previous paper, the effect of angle and length of the inlet guide vane on the performance of a cross-flow fan was examined. By installing a guide vane having one sheet in the tongue division side in the suction region, the performance of the cross flow fan resulted in higher pressure and higher efficiency than the case without the guide vane. In this study, a guide vane having several sheets is installed as a more convenient method in the suction region of the cross-flow fan. First, the reason of the generation of inlet pre-whirl flow of the cross-flow fan is investigated. Next, we show that the pre-whirl is controlled by the inlet guide vane. As a result, the following facts became clear. (1) The pre-whirl is generated by drawing in the inlet flow for the eccentric vortex of the interior rotor, and the inlet velocity therefore becomes non-uniform in the circumferential direction. (2) The cross flow fan becomes a high-efficient and high-pressure fan by controlling the pre-whirl using the inlet guide vane.
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