Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 11, 2022 - September 14, 2022
With the accelerating global adoption of electric vehicles, the automotive industry is about to reach a major turning point. In this context, we focused on centrifugal force and agitation for stable lubrication and delivery of oil inside the drive unit, which is indispensable to achieve the compact and high-speed motor technology that is so important. We quantitatively measured the ratio of the oil supply to the oil discharge by placing three discharge holes at each point of the circular tube. Based on the experiments, Ansys Fluent was used to reproduce the gas-liquid two-phase flow using the VOF method, and the rotational expression was analyzed numerically on a periodic boundary using MRF with fixed mesh and considering centrifugal and Coriolis forces. The percentage of discharge flow rate at each hole was evaluated for every 1000 [rpm] of rotation at different temperatures and different number of discharge holes. As a result, the results could not be perfectly reproduced because it was not clear whether the oil temperature in the high-temperature range was strictly controlled under the experimental environment, but the trend could be captured as the discharge from the first discharge hole became dominant at high rpm for both the 2-hole and 4-hole models. The trend could be captured.
