Screw Centrifugal Pump Vane Variable-pitch Design And Numerical Simulation

With the development of technology and economy, Hydraulic machinery are widely used to transport all kinds of solid matter in many fields. As a new kind of impurity pump, Screw centrifugal pump combines the advantages of screw pump and centrifugal pump, and the special structure can bring into play their advantages sufficiently. Comparing with the traditional impurity pump, screw centrifugal pump has a series of strong points, such as: good though condition, not easily building up, little abrasion in flowing parts, high efficiency, good nature life, low expense, and good accommodation.Impeller is a very Important components of impeller pump, One could even say that it is the heart of impeller pump, Impeller pump properties is good or bad largely depends on whether a reasonable impeller design,and the vane shape have a decisive impact to the impeller hydrodynamic characteristics.For screw centrifugal pump which Transportate liquid-solid two-phase flow media,because of it's impeller flow state complexition, the impeller curved surfaces equation of equal-pitch screw line have been unable to meet Design fine Hydraulic properties impeller's needs. From the solid-liquid two-phase media in the screw centrifugal pump impeller state of the sport, it's impeller make fluid from axial to radial completion of the transition, fluid axial velocity Into small,and Radial velocity on the contrary. This requires that the impeller pitch from import and export do large to small changes in the smooth.In this paper, The general equation of variable-pitch screw line is analyzed first. According to the movement characters with non-constant axial-velocity of liquid-solid two-phase flow in the screw centrifugal impeller and the screw centrifugal pump impeller structure characters, the vane variable-pitch profile equation for screw centrifugal pump is given. According to 150×100LN-32 screw centrifugal pump structure size and vane variable-pitch profile equation for screw centrifugal pump, Designed eight vane variable-pitch screw centrifugal pump.To the eight pump we use fluent software model water media and the solid-liquid two-phase medium Numerical Simulation, Discussion the vane variable-pitch impact to the screw centrifugal pump lift, Efficiency, internal flow field and adoption of the two-phase.