Page 70 - Advanced Gas Turbine Cycles

46 Advanced gas turbine cycles

200 Joo Qoo 500 600 700 800
SPECIFIC WORK Mlkg
Fig. 3.16. Overall efficiency and specific work of several irreversible gaq turbine plants (with T,, = 1200°C).
[CHTXIr cycle is much lower than that of the [CHTII cycle. The optimum pressure
ratio for maximum specific work falls between these two pressure ratios.
(c) The major benefits of the addition of reheating and intercooling to the unrecuperated
plants are to increase the specific work. However, when these features are coupled with
heat exchange the full benefits on efficiency are obtained.

References

[l] Hawthorne, W.R. and Davis, G.de V. (1956). Calculating gas turbine performance, Engineering 181,
361 -367.
[2] Horlock, J.H. and Woods, W.A. (2000), Determination of the optimum performance of gas turbines, Proc.
Instn. Mech. Engrs. J. Mech. Engng. Sci. 214(C), 243-255.
[3] Frost, T.H., Agnew, B. and Anderson, A. (1992). Optimisation for Brayton-Joule gas turbine cycles, Proc.
Instn. Mech. Engrs. Part A, J. Power Energy 206(A4), 283-288.
[4] Haywood, R.W. (1991). Analysis of Engineering Cycles, 4th edn, Pergamon Press, Oxford.
[5] Guha, A. (2003), Effect of internal combustion and real gas properties on the optimum performance of gas
present status turbines, Instn. Mech. Engrs., in press.
161 Keenan, J.H. and Kaye, J. (1945). Gas Tables, Wiley, New York.
[7] Young, J.B. (1998). Computer-based Project on Combined-Cycle Power Generation. Cambridge University
Engineering Department Report.
[8] Horlock, J.H., Watson, D.T. and Jones, T.V. (2001), Limitations on gas turbine performance imposed by
large turbine cooling flows, ASME J. Engng Gas Turbines Power 123(3), 487-494.
[9] Guha, A. (2000), Performance and optimization of gas turbines with real gas effects, Proc. Instn. Mech.
Engnrs. Part A 215,507-512.
[IO] Wilcock, R.C., Young, J.B. and Horlock, J.H. (2002), Real Gas Effects on Gas Turbine Plant Efficiency.
ASME Paper GT-2002-30517.