Rotordynamic Forces Due to Turbine Tip Leakage: Part II—Radius Scale Effects and Experimental Verification

[+] Author and Article Information
S. J. Song

Department of Aerospace Engineering, Inha University, Namgu, Inchon, Korea

M. Martinez-Sanchez

Department of Aeronautics/Astronautics, MIT, Cambridge, MA 02139

J. Turbomach 119(4), 704-713 (Oct 01, 1997) (10 pages) doi:10.1115/1.2841180 History: Received February 01, 1996; Online January 29, 2008


This paper presents a radius scale actuator disk model, which describes the flow response to a whirling/spinning rotor in an unshrouded turbine. At each azimuth, the upstream-downstream flow variables are matched by the results from a steady blade scale analysis presented in a companion paper, with allowance for mass storage in the stator-rotor region. The new model can accurately predict the magnitude of both direct and cross excitation forces as well as their breakdown into work extraction and pressure effects. The trends versus the mean flow coefficient and interblade distance are predicted. While underpredicted, a trend versus mean rotor tip clearance height is also indicated. Thus, the new model captures the dominant physical effects caused by a whirling/spinning rotor in an unshrouded turbine.

Copyright © 1997 by The American Society of Mechanical Engineers
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