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RESEARCH PAPERS

Turbine Heat Flux Measurements: Influence of Slot Injection on Vane Trailing Edge Heat Transfer and Influence of Rotor on Vane Heat Transfer

[+] Author and Article Information
M. G. Dunn

Aerodynamic Research Department, Calspan Advanced Technology Center, Buffalo, N.Y. 14225

J. Eng. Gas Turbines Power 107(1), 76-83 (Jan 01, 1985) (8 pages) doi:10.1115/1.3239700 History: Received January 12, 1984; Online October 15, 2009

Abstract

This paper describes the measurement of heat flux distributions obtained for a Garrett TFE 731-2 hp turbine. Measurements were obtained for a full turbine both with and without injection and for the nozzle guide vanes with and without a rotor. A shock tube is used as a short-duration source of heated air and miniature thin-film gages are used to obtain the heat flux measurements. Results are presented for values of the blowing parameter (ρc Vc /ρ∞ V∞ )at SLOT , in the range of 0.8–1.3. The injection gas (air) as a percentage of turbine weight flow, Wc /Wo , was in the range of 2.1–3.5 percent. A comparison is presented between results obtained with the rotor operating at 100 percent of corrected speed and those obtained with the rotor replaced by a row of flow straighteners. The results suggest that: (i) the reduction of heat flux due to injection is a function of the blowing parameter, the temperature ratio, and the physical location relative to the tip or hub endwall and (ii) the presence of the rotor has a significant affect on the vane trailing edge Stanton number, increasing it by 15 to 25 percent. The vane leading edge and midchord regions were generally unaffected.

Copyright © 1985 by ASME
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