jet engine thermodynamics
TRANSCRIPT
Study of All Components of Turbojet Engine, Its Working
& Complete Study of Its Thermodynamics
What Is A Jet Engine?
• A jet engine is a reaction enginedischarging a fast moving jet thatgenerates thrust by jet propulsionin accordance with Newton's lawsof motion.
• It is a machine designed for thepurpose of creating large volumesof high velocity exhaust gases.
• This is done in order to producethe thrust needed to overcome theaerodynamic drag of an aeroplane.
History Of A Jet Engine
• First jet engine was built byEgyptian scientists during 100B.C.
• These devices were known asAeolipile.
• Dr. Hans Von Ohain patented agas turbine engine on27th August 1939
• First Turbojet airline began in1952
Introduction
• Jet engine is nothing but a Gas turbine.
• It works under the principle of Newton’s third law
• It states that “For every action there is equal and opposite reaction”.
• Gas turbine operates like toy balloon
Parts of A Jet Engine
1. FAN2. COMPRESSOR3. COMBUSTOR4. TURBINE5. NOZZLE
Jet Engine
How A Jet Engine Works?
• The basic operation of a jet engine is:-
1. Air enters and is compressed in a compressor
2. Fuel is than added and ignited
3. The resulting gas spins a turbine
4. The turbine powers the compressor
5. The gas than exits the engine at the tail pipe
• The way a jet engine operates is similar to the way an automobile engine operates i.e intake, compression, ignition, exhaust
Types Of Jet Engine
• Ramjet
• Turbojet
• Turbofan
• Turboprop
• Turbo shaft
Brayton CycleThe Fundamental Thermodynamic Cycle On Which Gas Turbine Engines Are Based
Is CalledThe Brayton Cycle Or Joule Cycle
Jet fuels• Jet A , Jet A-1 & Jet B are the fuels mostly used in jet engines.
• Jet B is used in very cold climates where the temperature drops upto-600C
• Jet A-1 & Jet A has the following properties:-
1. Flash point = 380C
2. Auto-Ignition Temperature = 2450C
3. Freezing point A-1 = -470C
4. Freezing point A = -400C
Flast point of a volatile material is the lowest temperature at which itcan vapourize to form an ignitable mixture in air
Thanks…..
Jet propulsion
• What is propulsion?
• The word is derived from two Latin words:
pro meaning before or forwards, and
pellere meaning to drive.
• Propulsion means to push forward or drive an object forward.
• A propulsion system is a machine that produces thrust to push an object forward.