This paper aims to elucidate the vortex evolution characteristics generated by the tongue of the semi-spiral suction chamber and its influence on the cavitation of the pump.Based on the turbulent viscosity correction ...This paper aims to elucidate the vortex evolution characteristics generated by the tongue of the semi-spiral suction chamber and its influence on the cavitation of the pump.Based on the turbulent viscosity correction model,the internal flow of a centrifugal pump with a specific speed of 160 was simulated,and experimental data verified the simulation.This study focuses on analyzing the conditions of large flow rate,high-efficiency,and partial flow rate.The results show that the tongue will induce a tongue-induced vortex.The tongue-induced vortex extends from the tongue region to the impeller region,and its shape is curved and slender.The shape and volume of the tongue-induced vortex are related to the flow rate.The vortex’s shape is blurred and small in the partial flow rate.There is a complete and obvious curved slender vortex in the high-efficiency zone.In large flow conditions,the vortex’s shape is consistent with the high-efficiency zone and the volume is larger.The vortex’s strength is positively correlated with the circulation of the inlet,which is in the suction chamber.The tongue-induced vortex affects the distribution position of the low-pressure zone on the blade,thereby promoting the leading edge cavitation.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.52179092,52222904)supported by the State Key Laboratory of Efficient Utilization of Agricultural Water Resources,China Agricultural University.
文摘This paper aims to elucidate the vortex evolution characteristics generated by the tongue of the semi-spiral suction chamber and its influence on the cavitation of the pump.Based on the turbulent viscosity correction model,the internal flow of a centrifugal pump with a specific speed of 160 was simulated,and experimental data verified the simulation.This study focuses on analyzing the conditions of large flow rate,high-efficiency,and partial flow rate.The results show that the tongue will induce a tongue-induced vortex.The tongue-induced vortex extends from the tongue region to the impeller region,and its shape is curved and slender.The shape and volume of the tongue-induced vortex are related to the flow rate.The vortex’s shape is blurred and small in the partial flow rate.There is a complete and obvious curved slender vortex in the high-efficiency zone.In large flow conditions,the vortex’s shape is consistent with the high-efficiency zone and the volume is larger.The vortex’s strength is positively correlated with the circulation of the inlet,which is in the suction chamber.The tongue-induced vortex affects the distribution position of the low-pressure zone on the blade,thereby promoting the leading edge cavitation.
