A turbojet engine propels an aircraft at a Mach number of 0.8 in level flight at...
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A turbojet engine propels an aircraft at a Mach number of 0.8 in level flight at an altitude of 10 km. The data for the engine is given below. Stagnation temperature at the turbine inlet- 1200K Stagnation temperature rise through the compressor =175K Calorific value of the fuel-43MJ/kg, Compressor efficiency = 0.75 Combustion chamber efficiency = 0.975 Turbine efficiency = 0.81 Mechanical efficiency of the power transmission between turbine and compressor =0.98 Exhaust nozzle efficiency = 0.97. Specific impulse = 25 seconds. Assuming the same properties for air and combustion gases calculate: (a) fuel-air ratio, (b) Compressor pressure ratio (c) Turbine pressure ratio (d) Exhaust nozzle pressure ratio, and (e) Mach number of exhaust jet. 5 A turbojet engine propels an aircraft at a Mach number of 0.8 in level flight at an altitude of 10 km. The data for the engine is given below. Stagnation temperature at the turbine inlet- 1200K Stagnation temperature rise through the compressor =175K Calorific value of the fuel-43MJ/kg, Compressor efficiency = 0.75 Combustion chamber efficiency = 0.975 Turbine efficiency = 0.81 Mechanical efficiency of the power transmission between turbine and compressor =0.98 Exhaust nozzle efficiency = 0.97. Specific impulse = 25 seconds. Assuming the same properties for air and combustion gases calculate: (a) fuel-air ratio, (b) Compressor pressure ratio (c) Turbine pressure ratio (d) Exhaust nozzle pressure ratio, and (e) Mach number of exhaust jet. 5
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Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
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