1. Hello! I am Ahamath Jalaludeen I am here because I love to give presentations. You can find me at ahamathjalaludeen@gmail.com

2. AIR AUGMENTED ROCKETS

3. Rocket A rocket (Italian rocchetta‚ "little fuse") is a missile, spacecraft, aircraft or other vehicle that obtains thrust from a rocket engine. Rocket engines work by action and reaction. Rocket engines push rockets forward by expelling their exhaust in the opposite direction at high speed.

4. CHEMICAL ROCKETS Solid rocket boosters (SRB), or solid rocket motors (SRM), are used to provide thrust in spacecraft launches from the launchpad up to burnout of the SRBs. Compared to liquid-fuel rockets, the solid-fuel are advantageous for the purpose of boosting launches because they provide greater thrust and do not have the refrigeration and insulation requirements of liquid-fueled rockets. Solid boosters are usually cheaper to design, test, and produce compared to equivalent thrust liquid boosters. It is difficult to stop a solid rocket motor before normal burnout. The NASA Space Shuttle used two Space Shuttle SRBs, which were the largest of their type in production service. The propellant for each solid rocket motor on the Space Shuttle weighed approximately 500 000 kg

5. Launch of Ariane 44LP two solid rocket booster (smaller) and two liquid rocket boosters (larger, with no visible plumes) A liquid rocket booster (LRB) is similar to a solid rocket booster (SRB) attached to the side of a rocket to give it extra lift at takeoff. A liquid rocket booster has fuel and oxidizer in liquid form, as opposed to a solid-fuel rocket or hybrid rocket. Like solid boosters, liquid boosters can considerably increase the total payload to orbit. Unlike solid boosters, LRBs can be throttled down and are also capable of being shut down safely in an emergency, providing additional escape options for human spaceflight.

6. Solid rockets

7. Air-Augmented rocket Air-augmented rockets use air collected during flight to use as additional working mass, leading to greater effective thrust for any given amount of fuel. They represent a hybrid class of rocket/jet engines, similar to a ramjet, but able to also operate outside the atmosphere.

8. Normal Chemical Rocket Engine process An oxidizer and a fuel Combustion se ↑ ↑ in pressure Nozzle Thrust

9. Concept of Air Augmented Rocket Air An oxidizer and a fuel Same process Fuel From Atmosphere

10. Conventional rocket engine is mounted in the center of a long tube, open at the front. As the rocket moves through the atmosphere the air enters the front of the tube, where it is compressed via the ram effect. As it travels down the tube it is mixed with the hot exhaust from the engine, which expands the air just as it would in a jet engine, specifically, a ramjet.

11. In this way a fairly small rocket can be used to accelerate a much larger working mass than normal, leading to significantly higher thrust within the atmosphere.

12. Advantages The effectiveness of this simple method can be dramatic. Typical solid rockets have a specific impulse of about 260 seconds (2.5 kN·s/kg), but using the same fuel in an air-augmented design can improve this to over 500 seconds (4.9 kN·s/kg), a figure even the best hydrogen/oxygen engines can't match.specific impulse This design can even be slightly more efficient than a ramjet as the exhaust from the rocket engine compresses the air more than a ramjet normally would; this raises the combustion efficiency as a longer, more efficient nozzle can be employed.ramjet Another advantage is that the rocket works even at zero forward speed, whereas a ramjet requires forward motion to feed air into the engine.

13. Disadvantages  It might be envisaged that such an increase in performance would be widely deployed, but various issues frequently preclude this.  The intakes of high-speed engines are difficult to design, and they can't simply be located anywhere on the airframe whilst getting reasonable performance – in general the entire airframe needs to be built around the intake design.  Another problem is that the air eventually runs out, so the amount of additional thrust is limited by how fast the rocket climbs.  Finally, the air ducting weighs about 5× to 10× more than an equivalent rocket that gives the same thrust. This slows the vehicle quite a bit towards the end of the burn.

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