Study on Sediment Wear Characteristics of Solid-liquid Two-phase Flow in Centrifugal Pumps at Different Specific Speeds
Centrifugal pumps are often used for agricultural irrigation in pumping stations along the Yellow River.The wear problem of the flow passage components caused by the large sediment content of the Yellow River seriously threatens the normal operation of the pumping station.Specific speed is an important factor affecting blade shape and im-peller parameters.According to the difference of impeller of centrifugal pump with different specific speed,the wear characteristics of 5 centrifugal pumps with different specific speed were studied by using the numerical calculation method of solid-liquid two-phase flow.The results show that the blade wear distribution of the centrifugal pump with different specific speed is mainly concentrated in the inlet and outlet of the blade.With the increase of the specific speed,the cen-tral block wear area of the blade disappears,and the wear on the blade gradually decreases.The effects of flow rate,head and speed on blade wear decrease successively.The solid phase volume fraction is higher at the head of the blade,and a high solid phase volume distribution zone appears at the head with the increase of the specific speed.The solid phase vol-ume distribution on the blade is not obvious similar to the wear distribution,and has little effect on the wear of the blade.With the increase of the specific speed,the solid phase velocity in the center of the blade changes from higher than the head and tail to lower than the head and tail,which is the main reason for the disappearance of the massive wear area in the center of the blade.The distribution of the solid phase velocity on the blade is almost consistent with the wear distri-bution of the blade,which has the most obvious influence on the wear performance of the blade.It provides reference for hydraulic design and performance optimization of centrifugal pump in Yinhuang pumping station.
specific speedcentrifugal pumpsolid-liquid two-phase flowsand wear
万方数据
维普
