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为了揭示低比转数离心泵内部流动特征,采用粒子图像测试(PIV)技术对3个工况6个不同相位离心泵内的流动情况进行了试验研究,获得了泵内的动压及速度矢量的分布情况.试验结果表明:设计工况下,不同相位叶轮各流道内的动压分布基本一致,且随着半径的增加,动压值也有所增加;在t=0和t=2T/6相位,相位不同工况w/u比值的最大值靠近吸力面处,而在t=4T/6相位,最大值出现在流道中间区域,这说明隔舌对于流道内的速度分布有较大影响;随着流量的增加,蜗壳内的绝对速度也随之增加,在同一工况的不同相位,蜗壳内的速度基本相同.
In order to reveal the internal flow characteristics of low specific speed centrifugal pumps, the particle image test (PIV) was used to study the flow in three different centrifugal pumps with different operating conditions. The dynamic pressure and velocity vector The experimental results show that the dynamic pressure distribution in each flow passage of different phase impellers is basically the same under the design conditions, and the dynamic pressure value also increases with the increase of the radius. At t = 0 and t = 2T / 6 The maximum value of w / u ratio of phase and phase under different working conditions is close to the suction surface, while at t = 4T / 6, the maximum appears in the middle of the flow channel, which shows that the tongue has a great influence on the velocity distribution in the flow channel As the flow rate increases, the absolute velocity in the volute increases, and the velocities in the volute are basically the same in different phases of the same working condition.