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Jet engine thermodynamics


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It describe basic concepts about jet propulsion, Thrust & all Components of Turbojet Engine, Working & Complete Study of their Thermodynamics.

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Jet engine thermodynamics

  1. 1. Study of All Components of Turbojet Engine, Its Working & Complete Study of Its Thermodynamics
  2. 2. What Is A Jet Engine? • A jet engine is a reaction engine discharging a fast moving jet that generates thrust by jet propulsion in accordance with Newton's laws of motion. • It is a machine designed for the purpose of creating large volumes of high velocity exhaust gases. • This is done in order to produce the thrust needed to overcome the aerodynamic drag of an aeroplane.
  3. 3. History Of A Jet Engine • First jet engine was built by Egyptian scientists during 100 B.C. • These devices were known as Aeolipile. • Dr. Hans Von Ohain patented a gas turbine engine on 27th August 1939 • First Turbojet airline began in 1952
  4. 4. 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
  5. 5. Parts of A Jet Engine 1. FAN 2. COMPRESSOR 3. COMBUSTOR 4. TURBINE 5. NOZZLE
  6. 6. Jet Engine
  7. 7. 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
  8. 8. Types Of Jet Engine • Ramjet • Turbojet • Turbofan • Turboprop • Turbo shaft
  9. 9. Brayton Cycle The Fundamental Thermodynamic Cycle On Which Gas Turbine Engines Are Based Is Called The Brayton Cycle Or Joule Cycle
  10. 10. 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 it can vapourize to form an ignitable mixture in air
  11. 11. Thanks…..  
  12. 12. 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.