ME 326 - Chapter 9 Homework

# ME 326 - Chapter 9 Homework - Chapter 9 Homework ME326...

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Chapter 9 Homework ME326 Prepare a T-s diagram and a state table for each problem. PROBLEM E-9.2: A gas turbine powerplant operates with an 8:1 pressure ratio starting with inlet conditions of 20 ° C and 1 atm. The combustor provides 0.2 MJ/s, producing a turbine inlet temperature of 1000°C. Assume both compressor and turbine have efficiencies of 90%, and do not assume constant specific heats. a). What is the airflow rate in both kg/s and m 3 /s at the inlet? b). What are the net power output, cycle efficiency, and the percentage of the turbine work used by the compressor ("back-work ratio")? 2 3 1 4 T 1 = 20 o C P 1 = 1 atm Turbine Comp. Combustor T 3 = 1000 o C P 2 = 8P 1 IN Q = 200 kJ/s = 200 kW ± IN W ± OUT W ± P 4 = P 1 PROBLEM E-9.7: An ideal turbojet with afterburner operates at altitudes where the ambient pressure is 10 kPa. The inlet air temperature is -20 °C, and the pressure ratio is 7.5:1. The maximum turbine temperature allowable is 1500 °C.

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## This note was uploaded on 09/18/2011 for the course ME 326 taught by Professor Schmidt during the Fall '07 term at University of Texas at Austin.

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ME 326 - Chapter 9 Homework - Chapter 9 Homework ME326...

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