Abstract
It is the purpose of the present study to investigate the flow pattern in a fully three-dimensional poppet valve for oil hydraulic power applications and the vibration of the poppet by means of both numerical and experimental flow visualizations. The numerical simulation by a discrete vortex method is used to analyze the annular axisymmetric jet flow issuing from an orifice of the poppet valve. The experimental flow visualization in the poppet valve is conducted by using two industrial fiberscopes which are connected to two high-speed video cameras from two different directions simultaneously. The flow pattern near the orifice with cavitation and the vibration of the poppet are observed in three dimensions. A digital image processing technique for the image obtained by the flow visualization is employed.
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