Question

In: Mechanical Engineering

Air enters the diffuser of a turbojet engine at 18 kPa, 216 K, with a volumetric...

Air enters the diffuser of a turbojet engine at 18 kPa, 216 K, with a volumetric flow rate of 230 m3/s and a velocity of 265 m/s. The compressor pressure ratio is 15, and its isentropic efficiency is 87%. Air enters the turbine at 1560 K and the same pressure as at the exit of the compressor. The turbine isentropic efficiency is 89%, and the nozzle isentropic efficiency is 97%. The pressure at the nozzle exit is 18 kPa. Use an air-standard analysis.

a)

Determine the rate of heat input to the combustor, in MW.

Solutions

Expert Solution


Related Solutions

Air enters the diffuser of a ramjet engine at 22 kPa, 228 K and a velocity...
Air enters the diffuser of a ramjet engine at 22 kPa, 228 K and a velocity of 920 m/s, decelerating to a negligible velocity at the point at which heat is added. Using cold airstandard analysis with constant specific heats at 300K, determine the following if the exit pressure is 22 kPa and heat is added at 750 kJ per kg of air: (a) The pressure at the diffuser exit, in kPa. (b) The velocity at the nozzle exit, in...
air at 110 kpa and 25 degrees C enters a diffuser with diameter of 10 cm...
air at 110 kpa and 25 degrees C enters a diffuser with diameter of 10 cm and 25 cm at entrance and exit. if the velocity of air at the entrance is 15 m/s and leaving the diffuser at 1.5 m/s. determine a.) mass rate of air b.) density of air at the exit
1. Air enters a steady-state diffuser at T1 = 20 °C, P1 = 100 kPa and...
1. Air enters a steady-state diffuser at T1 = 20 °C, P1 = 100 kPa and leaves at P2 = 105 kPa. You may assume an adiabatic diffuser and constant specific heats. Find T2 if: a) V1 = 10 m/s, V2 = 0 m/s b) V1 = 100 m/s, V2 = 90 m/s c) V1 = 500 m/s, V2 = 490 m/s d) V1 = 1000 m/s, V2 = 990 m/s
Air enters the compressor at 100 kPa, 300 K and is compressed to 1000 kPa. The...
Air enters the compressor at 100 kPa, 300 K and is compressed to 1000 kPa. The temperature at the inlet to the first turbine stage is 1400 K. The expansion takes place isentropically in two stages, with reheat to 1400 K between the stages at a constant pressure of 300 kPa. A regenerator having an effectiveness of 100% is also incorporated into the cycle. The turbine and the compressor each have am isentropic efficiency of 80%. Determine the following: (a.)...
Air enters the compressor of an ideal air-standard Brayton cycle at 100 kPa, 300 K, with...
Air enters the compressor of an ideal air-standard Brayton cycle at 100 kPa, 300 K, with a volumetric flow rate of 5 m3/s. The turbine inlet temperature is 1800 K. For a compressor pressure ratio of 9, determine: (a) the percent thermal efficiency of the cycle. (b) the back work ratio. (c) the net power developed, in kW.
Air enters the turbine of a gas turbine at 1400 kPa, 1400 K, and expands to...
Air enters the turbine of a gas turbine at 1400 kPa, 1400 K, and expands to 100 kPa in two stages. Between the stages, the air is reheated at a constant pressure of 350 kPa to 1400 K. The expansion through each turbine stage is isentropic. Determine: (b) the heat transfer for the reheat process, in kJ/kg of air flowing. (c) the increase in net work as compared to a single stage of expansion with no reheat.
Air enters a compressor operating at steady state at 1.05 bar, 300 K, with a volumetric...
Air enters a compressor operating at steady state at 1.05 bar, 300 K, with a volumetric flow rate of 48 m3/min and exits at 12 bar, 400 K. Heat transfer occurs at a rate of 8 kW from the compressor to its surroundings. Assuming the ideal gas model for air and neglecting kinetic and potential energy effects, determine the power input, in kW.
Air enters the compressor of an ideal cold air-standard Brayton cycle at 100 kPa, 300 K,...
Air enters the compressor of an ideal cold air-standard Brayton cycle at 100 kPa, 300 K, with a mass flow rate of 6 kg/s. The compressor pressure ratio is 10, and the turbine inlet temperature is 1400 K. For k = 1.4 and Cp = 1.005 kJ/kg, calculate: (a) the percent thermal efficiency of the cycle. (b) the back work ratio. (c) the net power developed, in kW
Air at 400 kPa, 980 K enters a turbine operating at steady state and exits at...
Air at 400 kPa, 980 K enters a turbine operating at steady state and exits at 100 kPa, 670 K. Heat transfer from the turbine occurs at an average outer surface temperature of 315 K at the rate of 30 kJ per kg of air flowing. Kinetic and potential energy effects are negligible. Assuming the air is modeled as an ideal gas with variations in specific heat, determine (a) the rate power is developed, in kJ per kg of air...
An air compressor is operating at a steady state. The air enters at with a volumetric...
An air compressor is operating at a steady state. The air enters at with a volumetric flow rate 1.2 m^3/s at 170 kPa and 22 degrees celsius with negligible velocity and leaves at 1500 kPa with velocity of 200 m/s. The power to the compressor is 60 kW and the compressor is cooled at a rate of 15 kJ/kg. Determine the exit area.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT