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# Analysis of aircraft jet engine real cycles Notes | EduRev

## : Analysis of aircraft jet engine real cycles Notes | EduRev

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1
Lect-10
Page 2

1
Lect-10
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
2
Lect-10
In this lecture...
• Real cycle analysis
– Turbojet engine
– Turbojet with afterburning
– Turbofan engine
– Turboprop and turboshaft engines
Page 3

1
Lect-10
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
2
Lect-10
In this lecture...
• Real cycle analysis
– Turbojet engine
– Turbojet with afterburning
– Turbofan engine
– Turboprop and turboshaft engines
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
3
Lect-10
Real cycle for turbojet engines
a 1 2 3 4 5 6 7
Compressor
Diffuser
Combustion chamber/burner
Turbine
Afterburner
Nozzle
Schematic of a turbojet engine and
station numbering scheme
Page 4

1
Lect-10
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
2
Lect-10
In this lecture...
• Real cycle analysis
– Turbojet engine
– Turbojet with afterburning
– Turbofan engine
– Turboprop and turboshaft engines
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
3
Lect-10
Real cycle for turbojet engines
a 1 2 3 4 5 6 7
Compressor
Diffuser
Combustion chamber/burner
Turbine
Afterburner
Nozzle
Schematic of a turbojet engine and
station numbering scheme
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
4
Lect-10
Real cycle for turbojet engines
• The different processes in a turbojet cycle are
the following:
• a-1: Air from far upstream is brought to the
air intake (diffuser) with some
acceleration/deceleration
• 1-2: Air is decelerated as is passes through
the diffuser
• 2-3: Air is compressed in a compressor (axial
or centrifugal)
• 3-4 The air is heated using a combustion
chamber/burner
Page 5

1
Lect-10
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
2
Lect-10
In this lecture...
• Real cycle analysis
– Turbojet engine
– Turbojet with afterburning
– Turbofan engine
– Turboprop and turboshaft engines
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
3
Lect-10
Real cycle for turbojet engines
a 1 2 3 4 5 6 7
Compressor
Diffuser
Combustion chamber/burner
Turbine
Afterburner
Nozzle
Schematic of a turbojet engine and
station numbering scheme
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
4
Lect-10
Real cycle for turbojet engines
• The different processes in a turbojet cycle are
the following:
• a-1: Air from far upstream is brought to the
air intake (diffuser) with some
acceleration/deceleration
• 1-2: Air is decelerated as is passes through
the diffuser
• 2-3: Air is compressed in a compressor (axial
or centrifugal)
• 3-4 The air is heated using a combustion
chamber/burner
Prof. Bhaskar Roy, Prof. A M Pradeep, Department of Aerospace, IIT Bombay
5
Lect-10
Real cycle for turbojet engines
• 4-5: The air is expanded in a turbine to obtain
power to drive the compressor
• 5-6: The air may or may not be further
heated in an afterburner by adding further
fuel
• 6-7: The air is accelerated and exhausted
through the nozzle.
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