Abstract
According to the phenomenon of cavitation in the deep-sea mining pump and the instability of the pump’s speed, the pump’s cavitation characteristic under different speeds is studied. Based on the theory of multiphase flow and cavitation nucleus, the Euler model and Schnerr-Sauer cavitation model are used to simulate the pump’s steady state of cavitation under different rotational speed. The pressure distribution and gas volume distribution are analyzed as well as the pump’s external characteristics, and it is verified by experimental. The results show that the low pressure and cavitation appears on the inlet of the impeller blade at the pump’s first stage. Along the streamline direction, the pressure increases gradually and the gas disappears. With the rotational speed increases from 960r/min to 2000r/min, the area of the low pressure expands rapidly as well as the cavitation, the efficiency of the pump and the NPSHa drop to 30% and 1.05m respectively, the H adds to 90.89m. The calculation formula of the pump installation height is derived as (21). When the speed is the designed 1450r/min, the pump has the best installation position about 108m under the sea level.
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