Presented by:R.DINESH KUMARR.SANDEEPR.RESHMIB.E MATERIALS SCIENCE AND ENGINEERING.,(3RD SEM)

WHAT IS A SCRAMJET ENGINE?

Scramjet stands for supersonic combustion ramjet.

Combustion takes place in supersonic airflow .Air breathing jet engine.Has no turbo machinery.Integrated engine vehicle designed for aircraft

and missile.

COMPONENTS OF SCRAMJET ENGINESThe scramjet is composed of three basic

components:

1. The converging Inlet : incoming air is compressed and decelerated.

2. A Combustor : gaseous fuel is burned with atmospheric oxygen to produce thrust.

3. A diverging Nozzle : heated air is accelerated to produce thrust.

PRINCIPLE OF WORKING:

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.

NOZZLEThe 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.

FUELSHydrogen is the most commonly

used fuel.Steam is produced as a by

product which is eco friendly.Use of hydrogen eliminates the

need for igniters.

Advantages of scramjetDoes not have to carry oxygen.No rotating parts, making it easier to

manufacture.Less weight and simple design.

Disadvantages of scramjetAs scramjet cannot produce efficient

thrust until mach 5,it requires additional propulsion systems.

High costCooling is required.Testing difficulties.

References: BOOKS: Aircraft propulsion – Saeed Farokhi. Aerospace propulsion systems – Thomas A. Ward Aircraft propulsion – V. Babu The scramjet engine(processes and characteristics) – corin

segalJOURNALS: Kristen Nicole Robert ,”Analysis and design of hypersonic

scramjet engine with a starting mach number of four” , Kristen Nicole Robert , August 2008

Epstein ,M &Kutshenreuter, P 1994,”Fuel injection system for scramjet engine”, United States Patent, patent number 5280705.

G.M Sayeed Ahmed ,“Design and analysis of scramjet inlet”, International Journal of Scientific and Research Publications, Volume 3, Issue 1, January 2013.