Experimental Study on Flow Coefficient of the Rotating Radial Small Orifice Used in High Speed Shaft-type Commutation
In view of the rotating working condition of radial small orifices used in shaft-type commutation of high speed axial piston pump,the experimental study on flow coefficients of flow passing through small orifices was conducted.The two flow directions involved in this study,namely,the flow from the axis-center of the rotating cylinder block outward through the orifice is positive flow,and vice versa is reverse flow.The results show that the centrifugal force and Coriolis force have significant effects on the flow in rotating small orifice,the centrifugal force exerted on the fluid has the effect of giving energy to the fluid in the positive flow,and the flow coefficients increase with the increase of rotating speed.In reverse flow,the centrifugal force exerted on the fluid in small orifice holds the flow,and the flow coefficients decrease with the increase of rotating speed.With the increase of the average discharge velocity in orifices,the overall effect of the Coriolis forces in both directions is to makes the flow coefficient of positive flow decrease,on the contrary,the flow coefficient of reverse flow increase.When the discharge Reynolds number is large enough,regardless of forward or reverse flow,the flow coefficients of different orifices types have respectively the stable value.The stable values of the flow coefficient of various orifices in positive flow are within the range of 0.65～0.80.
rotating radial small orificesshaft type commutationflow coefficientrotational Reynolds numberdischarge Reynolds number
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