軸流送風機の低流量域に生じる後ろ回り振動について

抄録

In this study, computational fluid dynamics (ANSYS-Fluent 2019 R3, ANSYS-CFX 2020 R1) were used to investigate fluid vibrations in the low flow region of axial fans. Previous studies have shown that reverse rotational vibrations occur near the fan blades at low flow rates. The vibration of the fluid propagated in the circumferential direction on the tip side. The vibration of the fluid did not rotate on the hub side but was transmitted in the opposite direction from the hub side to the chip side on the envelope. In this study, based on what was assumed in the previous study at a blade frequency of 20 Hz, 2D and 3D calculations were performed in the region around the blade, and the fluid in the low flow region when the blade frequency was changed to 15 Hz. The vibration was visualized, and the propagation process between blades and the propagation in the envelope direction were investigated.