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By Robert Espey

Ramjets

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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 - PowerPoint PPT Presentation

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Page 1: Ramjets

ByRobert Espey

Page 2: Ramjets

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

Page 3: Ramjets

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

Page 4: Ramjets

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

Page 5: Ramjets

No moving parts Higher efficiencies Speeds limited

only by temperatures and pressures engine can handle

Schematic of a Ramjet

Schematic of a Scramjet (air remains supersonic)

VS.

Page 6: Ramjets

Low Fuel Efficiency Caused by low compression ratios High speed creates drag

Only operates at speeds above Mach1

Page 7: Ramjets

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

Page 8: Ramjets

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

Page 9: Ramjets

“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>