回転二重円筒狭隘流路における流動場の解明

抄録

Recently, electric vehicles (EV) have been gradually becoming popular, and EV motor have been developed accordingly. The heat inside motor affects the performance of the motor, it is necessary to cool the motor. Currently, oil-cooling motor are being developed for efficient heat removal. However, the flow inside oil-cooling motor is unknown. To improve the heat removal efficiency of oil-cooling EV motors, it is necessary to clarify the flow behavior inside the oil-cooling motor. The purpose of this study to elucidate the flow behavior of gas-liquid two-phase flow in a narrow gap between rotating coaxial cylinders, such as that inside an oil-cooling motor. As a preliminary step to elucidating the flow behavior of gas-liquid two-phase flow in a narrow gap between rotating coaxial cylinders, we investigated the effect of rotation speed on the air single-phase flow. We used PIV and Image analysis to evaluate the flow field, clarified distribution of flow velocity in a narrow gap between rotating coaxial cylinders.