A scramjet (supersonic combustion ramjet) engine is variant of a ramjet air breathing combustion jet engine in which the combustion process takes place in supersonic airflow.

1. A PRESENTATION ON
Scramjet Engine
Presented by-
Pratyush Shukla

2. CONTENT
 What Is Scramjet Engine?
 Components of Scramjet Engine
 Working Principle
 Comparison with other jet engines
 Advantages
 Disadvantages
 Conclusion

3. What Is Scramjet Engine?
 A scramjet (supersonic combustion ramjet) engine is variant of a ramjet air
breathing combustion jet engine in which the combustion process takes place in
supersonic airflow.
 A scramjet engine is an improvement over the ramjet engine as it efficiently
operates at hypersonic speeds and allows supersonic combustion. Thus it is known
as Supersonic Combustion Ramjet, or Scramjet.

5. Components of Scramjet Engine
The scramjet is composed of three basic components :
 1) A Converging Inlet, where incoming air is compressed and decelerated.
 2) A Combustor, where gaseous fuel is burned with atmospheric oxygen to produce heat.
 3) A Diverging Nozzle, where the heated air is accelerated to produce thrust.

6. Working Principle
 INLET
• The air approaches at supersonic speed into the inlet .
• The air is heated due to compression.
• The hot air is then let into the combustion chamber.
 Combustion Chamber
• Fuel is sprayed on the hot air in the combustion chamber.
• Dissociation of fuel takes place which increases the temperature of the air.
• The whole combustion process takes place at supersonic speeds.
• The ignited fuel along with the air is sent into the nozzle for exhaustion.

7. Working Principle
 Nozzle
• The gases are gushed out through the nozzle.
• The release of the gases produces forward thrust.
• The thrust produced exceeds the drag , which is the cause for forward motion.

8. Comparison with other jet engines
 Turbojet: A compressor pressurizes intake air before mixing it with fuel and
igniting it, causing expansion through a turbine to power the compressor, and out
the back to generate thrust.
 Ramjet: Just like a turbojet, except instead of a mechanical compressor, a scoop is
used to compress “ram air” air being scooped up by the engine. Like all other
engines so far, ramjets combust fuel-air mixture at subsonic speed, even if the
aircraft is supersonic. Ramjets only work after they are already traveling at high
speed, so they have limited application, mostly to upper stages of rocket boosted
missiles and such.
 Scramjet: A ramjet that combusts the fuel-air mixture in a supersonic airflow.

10. Advantages
 Does not have to carry oxygen tank.
 No rotating parts makes it easier to manufacture.
 Less weight and simple design.
 As the hydrogen is used as a propellant and combustion is carried out at
supersonic velocity with the help of oxygen from the atmosphere.
 As a result of that, steam (H2O) is being exhaust gas which is eco-friendly in nature.

11. Disadvantages
 A Scramjet cannot produce efficient thrust unless boosted to high speed, around Mach 5. As
a result an additional propulsion systems are required.
 Lack of stealth.
 Testing difficulties.

12. CONCLUSION
 Scramjet program is a fast developing field in the present world.
 There are many application with scramjet. It provides a cheaper and efficient access
to space.
 Scramjet has the potential for supersonic or hypersonic transportation.
 Scramjet technologies are also used for advanced military applications.

13. THANK YOU