Effect of Swirl on Rotordynamic Forces Caused by Front Shroud Pump Leakage
نویسندگان
چکیده
Unsteady forces generated by fluid flow through the impeller shroud leakage path of a centrifugal pump were investigated. The effect of leakage path inlet swirl (pump discharge swirl) on the rotordynamic forces was re-examined. It was observed that increasing the inlet swirl is destabilizing both for normal and tangential rotordynamic forces. Attempts to reduce the swirl within the leakage path using ribs and grooves as swirl brakes showed benefits only at low leakage flow rate. @DOI: 10.1115/1.1511164#
منابع مشابه
The Influence of Swirl Brakes on the Rotordynamic Forces Generated by bischarge-to- Suction Leakage Flows in Centrifugal Pumps
Increasing interest has been given to swirl brakes as a means of reducing destabilizing rotordynamic.forces due to leakage flows in new high speed rocket turbopumps. Although swirl brakes have been used successfully in practice {such as with the Space Shuttle HPOTP), no experimental tests until now have been pegormed to demonstrate their beneficial effect over a range of leakage flow rates. The...
متن کاملModel Predictions and Experimental Results for the Rotordynamic Characteristics of Leakage Flows in Centrifugal Pumps
Adiei GlIinzburg is a Research Scientisl at the l nsfifll l de Machines Hydrau /iques et de Mecaniqlle des Fluides at the EcoLe Polytechn ique Federate de Lausallne, Switzerland. She IIo/eisa B.Sc. degree in AeronaMical Engineeringfrom the University a/the Witwatersrand and M.S. and Ph.D. degrees from the CaLifornia Institute a/ Technology. Christopher E. Brennen is a Professor of Mechanical En...
متن کاملThe Influence of Swirl Brakes and a Tip Discharge Orifice on the Rotordynamic Forces Generated by Discharge-to-suction ?.. Leakage Flows in Shrouded Centrifugal Pumps
Recent experiments conducted in the Rotor Force Test Facility at the California Institute of Technology have examined the effects of a tip leakage restriction and swirl brakes on the rotordynamic forces due to leakage flows on arl impeller undergoing a prescribed circular whirl. The experiments simulate the leakage flow conditions and geometry of the Alternate Turbopump Design (ATE)) of the Spa...
متن کاملRotordynamic Forces from Discharge- to-Suction Leakage Flows in Centrifugal Pumps
The rotordynamic forces generated by the fluid flow through the impeller leakage path of a centrifugal pump are now well established. The present paper examines the effects of modifying the leakage path geometry by changing the front shroud, from a conical shape to a more typical curved design, and the effects of low pressure seal design on these forces. It is found that only the cross-coupled ...
متن کاملFluid Flow Equations For Rotordynamic Flows In Seals And Leakage Paths
Fluid-induced rotordynamic forces produced by the uid in an annular seal or in the leakage passage surrounding the shroud of a pump or turbine, are known to contribute substantially to the potential excitation forces acting on the rotor. In this paper we explore some of the important features of the equations governing bulkow models of these ows. This in turn suggests methods which might be use...
متن کامل