mech3020-s11-hw05 - enters the first compression stage at...

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MECH 3020 Thermodynamics II: Homework set #5, Due 2/4 1. Consider a simple and ideal gas turbine cycle. Inlet conditions are 300 K, the pressure ratio is 8, and the maximum temperature is 1400 K. (a) Calculate the work per unit mass and the thermal efficiency assuming the compressor and turbine are isentropic. Assume constant specific heats. (b) The compressor is now made reversible and isothermal. Calculate net work and thermal efficiency. (c) Along with the changes in b), an ideal regenerator is now installed. Perform the same calculations. 2. A gas turbine power cycle employs a two–stage compressor with intercooling and a regenerator. Air
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Unformatted text preview: enters the first compression stage at 300 K and 1 atm, and is compressed to 3 atm. The air is then cooled in the intercooler to 310 K, followed by the second compression stage to 9 atm. The air leaves the combustor at 1400 K, and a single turbine is used to expand the air. The regenerator has an effectiveness of 0.9, both compressor stages are isentropic, and the turbine has an isentropic efficiency of 0.85. The engine produces a net power output of ˙ W =2 MW. Calculate the volumetric flow rate of air entering the cycle and the cycle thermal efficiency. Assume constant specific heats. 1...
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