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A gas turbine unit has a pressure ratio of 5/1 and a maximum cycle temperature of...

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Mechanical Engineering

A gas turbine unit has a pressure ratio of 5/1 and a maximumcycle temperature of 550⁰C. The turbine drives the compressor andan electric generator., the mechanical efficiency of the drivebeing 97%. The ambient temperature is 20⁰C and the isentropicefficiencies of the compressor and turbine are 0.8 and 0.83respectively.

Calculate the power output in kilowatts for an airflow of15kg/s. Calculate also the thermal efficiency and the work ratio.Neglect changes in kinetic energy, and the loss of pressure in thecombustion chamber.

Take cp = 1.005 kJ/kg K and ɣ=1.4 for thecompression process, and take cp = 1.15 kJ/kg Kand ɣ=1.333 for all combustion and expansion processes.

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