Optimum pressure ratios for different gas turbine cycles

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Abstract
It is important to know the optimum pressure ratios for maximum power and efficiency of gas turbine engines. Their use would improve performance and reduce component design complexities and cost and help to select the appropriate cycle combination to meet the requirements of a specific application of the gas turbine engine, In this work optimum pressure ratios for maximum power r wand efficiency r’l were derived for eight alternative gas turbine cycles involving intercooling, heat exchange and reheat. The independent variables were maximum cycle temperature ratio t, compressor efficiency 11e, and turbine efficiency 11t. Due to the non-linear nature of the r’l equations, a numerical technique was used for the solution. Results show that rw is more sensitive to changes in the operating parameters than r’l’ especially in cycles which involve heat exchange. The final decision may be a thermo-economic optimum pressure ratio for the selected cycle, which is likely to be between rw and r’l’

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