SCRAMJET Engine

• The wall of Ramjet will tend to fail at the higher temperature around 2500k,
• Like Turbojets, Conventional ramjets are also limited by material problem at high Mach Number.
• When the temperature of the air entering the combustor is too high, during which the fuel injected, it will be decomposed by the higher temperature instead been burned (Fuel will absorb rather than producing energy).
• The engine will become a Drag producing machine instead for a Thrust producing device.
• When the air flow is decrease by the scramjet the relative velocity and kinetic energy both decrease, during that energy required that any missing kinetic energy will reappear as internal energy.
• When the flight Mach number exceeds about 6 led to decelerate the flow to subsonic speeds.

Advantage

• No moving parts easies to manufacture.

• Has less weight and simple design.

• Does not have to carry oxygen tank.

• High seed could be achieved easier, so cheaper access to outer space in the future.

Disadvantage

• Scramjet cannot produce efficient thrust unless achieves high speed, around Mach 5.

• Testing a Scramjet design requires a expensive equipments (hypersonic test chambers and launching vehicles).

• Lack of strength.

 

 

 

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