旋转阀配流用平板阀阀口的流量系数OA

For a flat valve under rotating conditions,experimental and numerical methods are used to investigate the flow coefficients and their variation laws under rotating and non-rotating conditions for both forward and reverse flows.The results show that the flow coefficient is proportional to the valve port overlap and inversely proportional to the opening height.This effect weakens as the rotational speed and valve opening increase.Under rotating conditions,centrifugal force dominates the flow behavior.For forward flow,the flow coefficient increases with rotational speed,whereas it decreases for reverse flow.The Coriolis force breaks the axisymmetric inlet velocity distribution and counteracts the centrifugal effect within the flow-control region.As a result,the forward-flow coefficient decreases with increasing discharge velocity,while the reverse-flow coefficient increases.The variation of the flow coefficient is jointly characterized by the rotational Reynolds number and the discharge Reynolds number.At high rotational Reynolds numbers(about 93000)and high discharge Reynolds numbers(about 5500),the flow coefficients converge to 0.72～0.73 for forward flow and 0.52～0.53 for reverse flow.At a constant discharge Reynolds number,increasing rotational speed raises the forward-flow coefficient above 0.73 and reduces the reverse-flow coefficient below 0.52.At a constant rotational Reynolds number,increasing discharge velocity drives both coefficients toward the stable values under non-rotating conditions(approximately 0.57～0.65).