Slurry pumps are the key component of a dredger. The performance of a slurry pump is closely related to the movement of the particles in its impeller. The relative velocities of medium sends (with particle diameter of 0.2~0.4mm) and coarse sands (with particle diameter of 0.8~1mm) in an impeller are severally measured using the measurement of Particle Image Velocimetry (PIV). The results show that,the variation of the relative velocity of medium sands is similar to that of the liquid phase in the flow channel, wherea high-speed region appears in the first half with a low-speed region in the second half. Themedium sands are faster than the liquid phase in the whole flow channels. In contrast,the variation of the relative velocities of coarse sands along the flow channel is smaller. The movement of the coarse sands are slower than the liquid phase in the first half of the flow channel, but little different from the liquid phase in the second half.%泥泵是挖泥船的核心设备,泥泵性能与叶轮内泥砂颗粒的运动密切相关.本文采用PIV(粒子图像测速)测量技术,分别对中砂(粒径0.2~0.4 mm)和粗砂(粒径0.8~1 mm)在叶轮内的运动速度进行了测量.研究表明:中砂颗粒沿流道的相对速度变化趋势与液相相似,均在流道前半段出现高速区,在后半段出现低速区,且中砂颗粒的相对速度值均高于液相;而粗砂颗粒在叶轮流道内相对速度值变化较小,在流道前半段低于液相,在后半段与液相相差不大.
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