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Ramjets

By Robert Espey. Ramjets. What is a Ramjet?. A ramjet is a jet engine that relies on forward momentum to create pressure instead of a moving piston or fan Requires forward motion to produce thrust Uses continuous combustion. How Does it Work?. Incoming air is slowed to subsonic by cone

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Ramjets

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  1. By Robert Espey Ramjets

  2. What is a Ramjet? • A ramjet is a jet engine that relies on forward momentum to create pressure instead of a moving piston or fan • Requires forward motion to produce thrust • Uses continuous combustion

  3. How Does it Work? • Incoming air is slowed to subsonic by cone • Slowed air creates pressure needed for combustion • Fuel injected into pressurized air • Flame ignites mixture • Air expands and flows through nozzle • Exhaust generates forward thrust Must be at least Mach1 before operating

  4. How Does it Work? (Cont.) • The thrust produced is based on pressure differentials at different sides of the plane • Limited by excessive temperatures and pressures at higher speeds and low pressure differentials at low speeds

  5. Advantages • No moving parts • Higher efficiencies • Speeds limited only by temperatures and pressures engine can handle Schematic of a Ramjet VS. Schematic of a Scramjet (air remains supersonic)

  6. Disadvantages • Low Fuel Efficiency • Caused by low compression ratios • High speed creates drag • Only operates at speeds above Mach1

  7. Uses • Ramjets and Scramjets have been used in missiles, helicopters, and the SR71 Blackbird with varying degrees of success.

  8. Applications • The United States funded a nuclear scramjet project for missiles called ‘Project Pluto” • Realized that ICBM’s did the job better and that low flying radioactive reactors weren’t the best idea

  9. Works Cited “Ramjet Engines.” 3 Dec. 2008 <http://www.aardvark.co.nz/pjet/ramjets.htm> “The Ramjet/Scramjet Engine.” 2 Dec. 2008 <http://www.aviation-history.com/engines/ramjet.htm> “Here Comes the Flying Stovepipe.” Time Magazine. 3 Dec. 2008 <http://www.time.com/time/magazine/article/0,9171,834721-1,00.html> “Ramjet.” Wikipedia. 2 Dec. 2008 <http://en.wikipedia.org/wiki/Ramjet>

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