The Effect of Turbine Blade Cooling on the Cycle Efficiency of Gas Turbine Power Cycles
Author:
Wilcock R. C.1, Young J. B.1, Horlock J. H.1
Affiliation:
1. Hopkinson Laboratory, Engineering Department, Cambridge University, Trumpington Street, Cambridge CB2 1PZ, UK
Abstract
A thermodynamic cycle analysis computer code for the performance prediction of cooled gas turbines has been used to calculate the efficiency of plants with varying combustor outlet temperature, compressor pressure ratio, and turbomachinery polytropic efficiency. It is shown that the polytropic efficiency exerts a major influence on the optimum operating point of cooled gas turbines: for moderate turbomachinery efficiency the search for enhanced combustor outlet temperature is shown to be logical, but for high turbomachinery efficiency this is not necessarily so. The sensitivity of the cycle efficiency to variation in the parameters determining the cooling flow rates is also examined. While increases in allowable blade metal temperature and film cooling effectiveness are more beneficial than improvements in other parameters, neither is as important as increase in turbomachinery aerodynamic efficiency.
Publisher
ASME International
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference13 articles.
1. MacArthur, C. D., 1999, “Advanced Aero-Engine Turbine Technologies and Their Application to Industrial Gas Turbines,” ISABE 14th Int. Symp. on Air-Breathing Engines, Florence, Paper 99-7151. 2. Horlock, J. H., Watson, D. T., and Jones, T. V., 2001, “Limitations on Gas Turbine Performance Imposed by Large Turbine Cooling Flows,” ASME J. Eng. Gas Turbines Power, 123, pp. 487–494. 3. Wilcock, R. C., Young, J. B., and Horlock, J. H., 2002, “Gas Properties as a Limit To Gas Turbine Performance,” ASME Turbo-Expo 2002, Amsterdam, Paper GT-2002-30517. 4. Young, J. B., and Wilcock, R. C., 2002, “Modelling the Air-Cooled Gas Turbine: Part 1-General Thermodynamics,” ASME J. Turbomach., 124, pp. 207–213. 5. Young, J. B., and Wilcock, R. C., 2002, “Modelling the Air-Cooled Gas Turbine: Part 2-Coolant Flows and Losses,” ASME J. Turbomach., 124, pp. 214–221.
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