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RESEARCH PAPERS: Gas Turbines: Electric Utilities

Dynamic Stability of a Water Brake Dynamometer

[+] Author and Article Information
R. A. Van den Braembussche

von Karman Institute for Fluid Dynamics, Waterloosesteenweg, 72, 1640, Sint-Genesius-Rode, Belgium

H. Malys

Technip, Tour Technip, 92090, Paris La Defense, France

J. Eng. Gas Turbines Power 120(1), 89-96 (Jan 01, 1998) (8 pages) doi:10.1115/1.2818092 History: Received August 16, 1996; Online November 19, 2007

Abstract

A lumped parameter model to predict the high frequency pressure oscillations observed in a water brake dynamometer is presented. It explains how the measured low frequency variations of the torque are a consequence of the variation in amplitude of the high frequency flow oscillations. Based on this model, geometrical modifications were defined, aiming to suppress the oscillations while maintaining mechanical integrity of the device. An experimental verification demonstrated the validity of the model and showed a very stable operation of the modified dynamometer even at very low torque.

Copyright © 1998 by The American Society of Mechanical Engineers
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