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Annular linear induction pump (ALIP) is considered as an ideal type of coolant pump in liquid metal cooled reactors. However, the low pump efficiency and the flow instability have yet been solved, especially for large-scale pump design. In this work, a two-dimensionally symmetrical ALIP model is developed and both single-sided (SS) and double-sided (DS) windings in stators are simulated in the designed ALIP model. The pump performance characteristics (H-Q curve) are obtained by calculating the differential pressure between inlet and outlet at varying flow rate conditions. The simulated results are validated with the previously published experiment. The results show that the differential pressure of the DS-type pumps is slightly lower than that of SS pump with the same input energy while the radial velocity profile in the channel of the DS pumps with the winding number of outer stator twice that of inner stator shows the best uniform velocity distribution. By peeking into the Lorentz force and induced magnetic field, the DS pump with equal winding numbers at inner and outer stators actually deteriorates the induced magnetic field, resulting in a highly non-uniform Lorentz force in the channel radial direction, particularly at high flow rate. The results demonstrate the importance of finding an appropriate ratio of winding numbers in the DS-type pump design in order to improve the pump performance.

No abstract

With the continuous development of the coal mining industry in recent years, major mine accidents caused by colliery flood emerge in endlessly in China. Therefore, mine flood has been one of the bottlenecks restricting to China's exploitation of resources and large submersible pump is the only effective equipment for the prevention and rescue in mine-flood accident. Based on the BQW50 mine pump, this paper presented a new-type explosion-proof submersible mine pump with inner motor, and put forward the explosion-proof design, structural design and hydraulic design of mine pump. In addition, three-dimension unsteady turbulent flow calculations were implemented for this mine pump, and the strain caused by water pressure in the volute could be obtained by using the elastic finite element method for non-steady-state. Moreover, through the iterative coupled calculations between the fluid mechanics and solid mechanics, coupled analyses in the volute with the material of QT600-3 were obtained. The results indicate that the maximum stress appears at the junction between the volute tongue and the cover plate while the maximal strain comes out in the front cover plate in front of the volute tongue. In the case of normal working conditions, the resonance caused by the pressure pulsation appears unlikely. This paper is instructive to the proper design on the mine pump.