Modeling the Air-Cooled Gas Turbine: Part 2—Coolant Flows and Losses

[+] Author and Article Information
J. B. Young, R. C. Wilcock

Cambridge University Engineering Department, Trumpington Street, Cambridge, CB2 1PZ, United Kingdom

J. Turbomach 124(2), 214-221 (Apr 09, 2002) (8 pages) doi:10.1115/1.1415038 History: Received February 01, 2001; Online April 09, 2002
Copyright © 2002 by ASME
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Young,  J. B., and Wilcock,  R. C., 2001, “Modelling the Air-Cooled Gas Turbine: Part I—General Thermodynamics,” ASME J. Turbomach., this issue, 124, pp. 207–213.
Holland,  M. J., and Thake,  T. F., 1980, “Rotor Blade Cooling in High Pressure Turbines,” J. Aircr., 17, pp. 412–418.
Horlock, J. H., 1966, Axial Flow Turbines, Chap. 8.3.
El-Masri, M. A., 1986, “Prediction of Cooling Flow Requirements for Ad-vanced Utility Gas Turbines: Part I: Analysis and Scaling of the Effectiveness Curve; Part II: Influence of Ceramic Thermal Barrier Coatings,” ASME Papers No. 86-WA/HT-43 and 86-WA/HT-44.
El-Masri,  M. A., 1986, “On Thermodynamics of Gas Turbine Cycles: Part II—A Model for Expansion in Cooled Turbines,” ASME J. Eng. Gas Turbines Power, 108, pp. 151–159.
Kawaike,  K., Kobayishi,  N., and Ikeguchi,  T., 1984, “Effect of Blade Cooling System With Minimized Gas Temperature Dilution on Gas Turbine Performance,” ASME J. Eng. Gas Turbines Power, 106, pp. 766–764.
Hartsell, J. E., 1972, “Prediction of Effects of Mass-Transfer Cooling on the Blade-Row Efficiency of Turbine Airfoils,” AIAA 10th Aerospace Sciences Meeting, San Diego, Paper No. AIAA-72-11.


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Simplified blade cooling model
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Notation for the heat transfer model (stators and rotors)
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Sensitivity of cooling flowrate to changes in operating conditions
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Coolant/mainstream total pressure ratio as a function of mainstream Mach number and momentum flux ratio I
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Fluid friction and heat transfer in a one-dimensional flow
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Definition sketch for mixing analysis
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Variation of cooling losses with cooling flowrate
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Schematic diagram of a cooled gas turbine stage



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