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RESEARCH PAPERS: Gas Turbines: Heat Transfer

Phase-Averaged Wall Shear Stress, Wall Pressure, and Near-Wall Velocity Field Measurements in a Whirling Annular Seal

[+] Author and Article Information
G. L. Morrison, R. B. Winslow, H. D. Thames

Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843

J. Eng. Gas Turbines Power 118(3), 590-597 (Jul 01, 1996) (8 pages) doi:10.1115/1.2816689 History: Received February 16, 1995; Online November 19, 2007

Abstract

The flow field inside a 50 percent eccentric whirling annular seal operating at a Reynolds number of 24,000 and a Taylor number of 6600 has been measured using a three-dimensional laser-Doppler anemometer system. Flush mount pressure and wall shear stress probes have been used to measure the stresses (normal and shear) along the length of the stator. The rotor was mounted eccentrically on the shaft so that the rotor orbit was circular and rotated at the same speed as the shaft (a whirl ratio of 1.0). This paper presents mean pressure, mean wall shear stress magnitude, and mean wall shear stress direction distributions along the length of the seal. Phase-averaged wall pressure and wall shear stress are presented along with phase-averaged mean velocity and turbulence kinetic energy distributions located 0.16c from the stator wall, where c is the seal clearance. The relationships between the velocity, turbulence, wall pressure, and wall shear stress are very complex and do not follow simple bulk flow predictions.

Copyright © 1996 by The American Society of Mechanical Engineers
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