This document summarizes a seminar presentation on scramjet engines. It begins with an introduction to propulsion systems and classifications of propulsive engines such as propellers, turboprops, and turbojets. It then discusses ramjet and scramjet engines as examples of athodyd engines that use ambient air without compressors or turbines. The main portion of the document explains the working of scramjet engines, which can operate at supersonic speeds from Mach 6 to Mach 10 or higher. Scramjets provide integrated engine and vehicle design and allow combustion to occur within supersonic airflow. Potential applications include hypersonic missiles, military craft, and future civilian aircraft. Advantages are high speeds without moving parts,

1. SEMINAR ON
SCRAMJET ENGINE
Presented by:
SHREENIDHI R
1RE13ME151
Department of Mechanical Engineering

2. CONTENTS
 Introduction to propulsive devices
 Classification of propulsive engines
 Athodyd engines
 Scramjet Engine
 About the Engine
 Working of Engine
 Comparison of scramjet
 Applications
 Advantages and Disadvantages
 Conclusion

3. What is propulsive Device?
 A Propulsion system is a machine that produces thrust to push an
object forward .
 All the phenomenon of propulsive devices are based on Newton’
second and third law.
 In these devices a change in momentum of mass of propellant
imparts its energy due to combustion and the reaction of
accelerating fluid mass results in a propulsive force or thrust.

4. Classification of Propulsive Engines

5. Those which make use of ambient air
INDIRECT REACTION ENGINE DIRECT REACTION ENGINE
PROPELLER
TURBOPROP
TURBOJET

6. What is ATHODYD?
 Athodyd is nothing but an AERO-THERMODYNAMIC DUCT.
 Athodyd is a straight duct type of engine without a compressor and
a turbine wheels.
 The entire compression is obtained by a ram, eliminating the need
of turbine.
 Athodyd’s are used for pilot less aircrafts and missiles.
 The Ramjet, Scramjet and Pulse jet are the examples for athodyd
engines.

7. Some Basic Terminologies

8. Supersonic Combusting RAM Jet
 Scramjet is an variant of Ramjet air breathing engine, in
which combustion takes place in supersonic air flow.
 The scramjet provides the most integrated engine vehicle
design for air craft and missile.
Before we look into SCARMJET it is necessary
to understand the working of RAMJET engine.
Since SCRAMJET is an advanced version of a RAMJET

9. RAMJET ENGINE
Ramjet works most efficiently at supersonic speeds around Mach3.
This type of engines can operate up to speed of Mach 7
APPLICATIONS: Extensively used in missile technology and space
research.

10. Now what is SCRAMJET?
 A scramjet is a variant of a ramjet air breathing jet engine in
which combustion takes place in supersonic airflow.
 By contrast, the air flow in a pure scramjet remains supersonic
throughout the combustion process and does not require a
choking mechanism, which provides optimal performance over a
wide operating range of Mach number.
 The propulsion system consists of five major engine and two
vehicle components, which is very much simple and light weight
compared to conventional jet engines.
 Modern scramjet can work as both a ramjet and a scramjet and
seamlessly make the transition between the both.
 Scramjet engine seems to be the future hope of modern fighter
jet and missile engine. There is a range of possible application for
scramjet, including missile propulsion, hypersonic cruiser
propulsion, and a part of a staged space access propulsion
system.

11. About SCRAMJET Engine Design
The propulsion system consists of five major engine and two vehicle components:

12. PRINCIPLE OF OPERATION
Scramjet starts to operate when the speed of the craft reaches
Mach6.
The speed of the air in combustion chamber remains supersonic .
The operating range of scramjet is from Mach6 to Mach
10,12,14,?

13. Lets see How it works….

14. Comparison of Propulsive Devices

15. APPLICATIONS
HYPERSONIC MISSILE ROCKET PROPULSION
MILITARY APPLICATION CIVIL AIRCRAFT

16. ADVANTAGES
NO OXIDIZER HIGH SPEED NO MOVING PARTS
ACCESS TO OUTER SPACE HYPERSONIC SPEED

17. DISADVANTAGES
EXPENSIVE INITIAL PROPULSION REQUIREMENT
TESTING DIFFICULTIES

18. CONCLUSION
The scramjet is the most effective solution to the problem of achieving
hypersonic speeds with aircraft using an air breathing engine. In
experimental flight tests and ground test scramjet has exceeded
expectations . Although there is more testing to be done before it is put
into production , these engines are the propulsion systems of the
future. They are capable of achieving speeds up to Mach 15.
Implementing scramjet technology in military and aerospace
applications will keep the Indian air force (IAF) and ISRO on the
cutting edge of aviation technology .
With continued research and understanding not only scramjet engines
change the way we reach outer space and fight our wars , they could
change the way we travel and interact with other forms around the
world.