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RESEARCH PAPERS

Hot Streaks and Phantom Cooling in a Turbine Rotor Passage: Part 2—Combined Effects and Analytical Modeling

[+] Author and Article Information
R. J. Roback, R. P. Dring

United Technologies Research Center, East Hartford, CT 06108

J. Turbomach 115(4), 667-674 (Oct 01, 1993) (8 pages) doi:10.1115/1.2929301 History: Received February 04, 1992; Online June 09, 2008

Abstract

This paper presents experimental documentation and analytical correlations demonstrating the effects of hot streak accumulation and phantom cooling on turbine rotor airfoil surface temperature. In particular, results are shown that quantify the impact of (1) a nonuniform temperature profile at the entrance of a turbine due to combustor-generated hot and cold streaks, and (2) cooling air discharged from the trailing edge of the upstream stator. In Part 1 of this paper, experimental results were shown for a range of controlling variables to identify where streak accumulation and phantom cooling were most likely to be strongest. These variables include streak-to-free-stream density ratio, streak injection location, and coolant-to-free-stream density and velocity ratios. In Part 2 of this paper, experimental results will be shown for the combined effects of hot streak and stator coolant on the adiabatic recovery temperature on the rotor. An analytical model is also developed to correlate the experimental results documented in Parts 1 and 2 of the paper.

Copyright © 1993 by The American Society of Mechanical Engineers
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