Propulsion: Propulsion is the act to drive a propulsive vehicle forward by producing thrust in flight. Thrust force is developed based on the Newton’s laws of motion.

Propulsive System: It is a machine (engine) that produces thrust to push an object forward. The propulsive system drives the aircraft forward by displacement of working fluid (air & fuel/combustion products) in direction opposite to that in which an airplane is propelled.

Chemical Propulsive systems burn the fuel, whereby the energy stored in the chemical bonds is released; and this energy, in the form of heat, is converted into mechanical motion.

Propulsive Systems (Engines) are broadly grouped into

  1. Internal Combustion Engines
  2. External Combustion Engines
  3. Air Breathing Engines
  4. Non-air breathing Engines

Internal Combustion Engines:

  1. Combustion of fuel occurs in the engine cylinder
  2. Combustion is usually intermittent
  3. 1Fresh mixture of air & fuel is taken in again

External Combustion Engines:

  1. Internal working fluid (air & fuel) is heated by combustion products of an external source in a heat exchanger
  2. The heated working fluid is expanded to provide the useful force to propel the deviceThe working fluid is then cooled, compressed and reused

Posted by sankeerth

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