Aerospace Engineering > GATE 2009 > Afterburners
A combat aircraft engine is equipped with an afterburner followed by a variable area convergent nozzle
(operating with the nozzle choked). The exhaust gas temperature is 750 K when afterburner is off and
3000 K when it is on. When the afterburner is turned on, (assuming the total pressure remains the same,
the mass of fuel added in the afterburner is negligible i.e., the mass flow rate remains the same, and the
specific heat ratio ( ) remains constant), approximately by what factor must the nozzle area be
changed ?
(operating with the nozzle choked). The exhaust gas temperature is 750 K when afterburner is off and
3000 K when it is on. When the afterburner is turned on, (assuming the total pressure remains the same,
the mass of fuel added in the afterburner is negligible i.e., the mass flow rate remains the same, and the
specific heat ratio ( ) remains constant), approximately by what factor must the nozzle area be
changed ?
Correct : d
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