パイロットリレー内ポペット弁まわりの流れに関する研究

概要

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This paper has a purpose of making fluid flow around the poppet valve in the pilot relay used for the valve positioner about the process control system clear. It considers the Law of similarity about the fluid flow and the model which is similar to the actual pilot relay is made of transparent acrylic resin. A visualization experiment for the model is done in the tracer injection method using alumina as the tracer. The visualized photograph of the fluid flow depending on the difference of the beveling angle and the exhaust valve displacement is taken with the still camera. The fluid flow around the poppet valve was analyzed through the visualized photograph of the flow and then the following phenomena became clear. When the beveling angle of an exhaust valve is larger than 60 degrees, the fluid flow around the poppet valve is stable. When the beveling angle is smaller than 45 degrees, however, the fluid flow is unstable and then it is easy for the vibration of the poppet valve to happen. When the displacement quantity of the exhaust valve increase, the fluid flow around the poppet valve has the tendency which biases from the central axis of the exhaust valve.
明治大学の論文