The Mach number ofan ideal turbojet that flies at 27,000 ft is 0.82. The airflow
is 205 lbm/s, and the burner total temperature is 2550 OR. The heating value of
the fuel is 17,700 Btu/Ibm. Ifthe thrust is to be maximized, find the resulting
compressor ratio and TSFC. How sensitive is the thrust to this pressure ratio
that is, if the pressure ratio is increased by 4 percent, how much will the
thrust drop? How much will the TSFC drop? Comment.
manual solution Fundamentals of Jet Propulsion with Applications by Flack. R.D
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Eng.Yazan Jarrah
The Mach number ofan ideal turbojet that flies at 27,000 ft is 0.82. The airflow
is 205 lbm/s, and the burner total temperature is 2550 OR. The heating value of
the fuel is 17,700 Btu/Ibm. Ifthe thrust is to be maximized, find the resulting
compressor ratio and TSFC. How sensitive is the thrust to this pressure ratio
that is, if the pressure ratio is increased by 4 percent, how much will the
thrust drop? How much will the TSFC drop? Comment.
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A turbojet operates at sea level and moves at 800ft/s. It ingests 113.4kg/s of air and has negligible fuel flow. The area of the exit is 3 f2. The exit pressure is 151.7kPa and the exit velocity is 1300ft/s. What is the thrust generated?P0=120kpa
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