小型軸流ファンにおける翼周り流れの数値解析

抄録

Numerical simulations were conducted by using LES (Large Eddy Simulation) with DSM (Dynamic Smagorinsky Model) about two kinds of axial flow small fan for cooling electronic devices. In this study, the tested fans have non-axisymmetric casing (Normal fan) and axisymmetric casing (Silent fan). The numerical simulations of the flow around those fan blades were compared. Therefore, the both of fans have low pressure (Cp≤-0.6) area in center of suction side surface in blade tip. Especially in normal fan, the pressure level of low pressure areas fluctuate by fluctuation of tip vortex. This fluctuation of tip vortex is caused by fan blades passing small radius parts with separating flow and large radius parts without separating flow alternately.