The motion law of solid particles in the pump is the research and development basis of two-phase flow pump, which is an important equipment in deep-sea mining. In this paper, a transparent pump test platform is developed, and the experimental research on the movement of particles in the pump is carried out. At the same time, the test results under the same working condition are compared with the numerical simulation results, and the motion law of particles in the pump is analyzed and obtained.
The motion law of particles in the pump is the research focus of solid-liquid two-phase flow pump at present. The structure of solid-liquid two-phase flow pump is mainly centrifugal, and the research methods include experimental research and numerical simulation. Some characteristics of particle velocity distribution in the pump are obtained by particle image velocimetry. First of all, the particle size has a certain impact on the relative velocity of solid and liquid in the pump impeller. The smaller the particle size is, the smaller the relative velocity between particles and liquid, at the same time, the velocity of large particle size is only gradually close to the liquid at the impeller outlet. Secondly, with the increase of pump speed and particle concentration, the trend of particle movement to the blade pressure surface is more significant (Mehmet et al., 2001; Kadambi et al., 2004; Xu et al., 2017). However, this technology can not obtain the trajectory of particles, and when there are too many particles, it will block the laser illumination. The velocity, trajectory and distribution of particles in the pump can be obtained by high-speed camera technology. The trajectory change law of spherical particles with different particle sizes in the pump is similar, and there is a tendency to move to the back of the blade at the inlet of the impeller, in the process of movement, the particles gradually separate from the back of the blade and close to the pressure face of the next blade (Tan et al., 2021). The volume concentration of small mass particles near the blade pressure surface at the impeller outlet is high, while the distribution of large mass particles is just the opposite (Yang et al., 2006).
