マグヌス力がおよぼす油圧L字型配管内ボール挙動への影響

抄録

This paper presents a control method of a check ball in hydraulic L-shaped pipe by Magnus effect. The spring-driven ball-type check valve is one of the most important components of hydraulic systems: it controls the position of the ball and prevents backward flow. In this paper, by using CAE tool, we evaluated the relationship between the position of the inlet pipe and the levitation time. By moving the position of the inflow pipe from the center of the housing, a strong swirling flow is generated in the entire housing to give rotational motion to the check ball. Magnus force was exerted by this rotation and it was found that the levitation time was advance. The check ball is arranged as a check valve in the L shape piping of the hydraulic cylinder. The check ball is supported by a spring to ensure the check operation. However, the spring must be eliminated due to various problems. This causes the check ball to rotate and translate. In the experiment, it is difficult to confirm the behavior of the check ball and the detailed flow around it. The purpose of this study is to clarify the effect of the Magnus force acting on the rotation of the check ball by using CAE tool. It was found that there is a difference in the time to check depending on the rotation direction and rotation speed of the check ball.