The air mass flow rate at the inlet of a jet engine is 10 kg/s. At...

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The air mass flow rate at the inlet of a jet engine is 10 kg/s. At the exit of the turbine the stagnation enthalpy is 600 kJ/kg. The mass flow rate of fuel in the jet engine combustor = 0.04 kg/s and in the afterburner is mfAR is 0.06 kg/s. The combustion efficiency is mfc in the afterburner is AB = 0.5. The mass flow rate of air that is left at the exit from the afterburner is 6 kg/s. The maximum temperature in the afterburner is 1650 K. 1. What is the excess air XAB in the afterburner? 2. What is the excess air λc in the jet engine combustor? Note: for standard fuel, LHV = 43,500 kJ/kg and minL = 14.66. The air mass flow rate at the inlet of a jet engine is 10 kg/s. At the exit of the turbine the stagnation enthalpy is 600 kJ/kg. The mass flow rate of fuel in the jet engine combustor = 0.04 kg/s and in the afterburner is mfAR is 0.06 kg/s. The combustion efficiency is mfc in the afterburner is AB = 0.5. The mass flow rate of air that is left at the exit from the afterburner is 6 kg/s. The maximum temperature in the afterburner is 1650 K. 1. What is the excess air XAB in the afterburner? 2. What is the excess air λc in the jet engine combustor? Note: for standard fuel, LHV = 43,500 kJ/kg and minL = 14.66.

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