Influence of Number of Threads on the Performance of Single Screw Pump for Higher Angular Velocities

摘要

Fluid flow in a screw pump which rotates at very high angular velocity isnumerically analyzed.Numerous studies have been done in this field focused on low Reynolds number regime.In the present study, flow under high Reynolds number, of the order of 105, is considered.Screw pump has two major elements, aplain shroudwhich is a stationary element and a rotating hubwith helical grooves contained within the shroud.In thispaper, threevariants of hubs with different number of thread starts (TS) numbering six, eight and twelvein combination with a plain shroud is studied.Each of the three possible combinations are analyzed on the basis of pressure rise developed, efficiency and shaft power.It was seen that pressure rise, efficiency and shaft power increases as the number of threads increases in the range of mass flow rates studied.