Solid-liquid two-phase flow and wear characteristics of high-speed multi-stage deep-well pumps

In order to study the solid-liquid two-phase flow inside the high-speed multi-stage deep-well pump and the wear characteristics of the flow passage components, the discrete phase model（DPM） was used to numerically simulate the internal flow of deep-well pump, and the wear model was used to numerically calculate the wear of the impeller and space guide vane. The flow law of solid-phase particles inside the deep-well pump and the wear of the impeller and space guide vane under different flow rates were analyzed. The research results show that under the low flow rate condition, the trajectory of the particles at the inlet of the impeller blade is relatively disordered, and the particle velocity increases with the increase of flow rate. The particles are mainly distributed on the head and pressure surface of the impeller blade, and the particle distribution area gradually expands with the increase of flow rate. On the space guide vane, the particles are mainly distributed in a band on the pressure surface of the blade near the outer edge, and the particle accumulation on the blade is more serious under the high flow rate. The wear area of the impeller blade expands with the increase of the flow rate, and the wear degree is most serious at the head of the blade. The wear rate and wear area of the space guide vane increase with the increase of the flow rate, and the most serious is located at the pressure surface of the blade near the outer edge under the high flow rate. The maximum wear rate of the first-stage impeller and space guide vane is the largest, and the maximum wear rate of the impeller and space guide vane gradually decreases with the increase of the number of stages. The maximum wear rate of the impeller under the small flow condition is the largest and the maximum wear rate of the impeller under the rated flow condition is the smallest. In the first-stage, the maximum wear rate is 33.5 times and 8.5 times of 2 m~3/h and 4 m~3/h, respectively, when the flow rate is 6 m~3/h. The maximum wear rate of the first-stage space guide vane is greatly affected by the flow rate.