Abstract
This study describes a velocity profile and a pressure distribution in the hydraulic spool valve in low pressure. The spool valve is made of acrylic resin with the spool diameter of 24 mm. Three slit widths of 0.8 mm, 1.2 mm and 1.6 mm are employed in the experiment. Velocity profile at median plane was measured using laser Doppler velocimeter. Upstream region of the slit, velocity is maximum near the wall of spool in annulus region between two concentric cylinders (d=13 mm and D=24 mm). In the downstream region of the slit, jet changes from straight flow to the attaching flow on the side wall of housing, when the Reynolds number increases. Three dimensional numerical analysis was performed by a finite element method under conditions of steady and turbulent. Calculated velocity profiles in the upstream region of the slit agree with experimental ones, and flow patterns of jet in the downstream region agree with measurements at Re>10 000. Calculated pressure distributions were integrated at both ring-shaped surfaces of the slit side and the upstream side of spool, and axial force acting on spool was calculated.
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