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JET ENGINE THEORY AND DESIGN

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JET ENGINE THEORY AND DESIGN ( jet-engine-theory-and-design )

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 Air compression depends solely on “ram effect.”  A limited amount of heat is added.  Considerable heat is lost by radiation. The next step is to improve the method of adding heat, through internal combustion. Figure1-7 shows a divergent-convergent duct. Fuel is injected and burned, releasing heat directly into the airstream. This simple “Aero Thermo Dynamic Duct” (ATHODYD) or RAMJET is used in remotely piloted vehicle (RPV), cruise missiles, and National Aeronautics and Space Administration (NASA) on their X-15 and X-34 projects. Figure 1-6 — A convergent discharge nozzle. Figure 1-7 — the ramjet engine. The “intermittent impulse” jet engine (Figure1- 8), known as the aero-pulse or pulsejet, improves compression by sacrificing the principle of continual power generation. The pulsejet is like the ramjet, but with a series of non-return shutter valves. Fuel injection nozzles located just aft of the shutter valves provide fuel. As the engine travels through the air, pressure on the nose opens the valve and rams air into the duct, mixing air with fuel. Igniting the combustible mixture creates a high pressure (from the expanding gases), closing the valves. The violent ejection of the gases forms a relatively low pressure area inside the duct, admitting a fresh charge of air through the flat spring valves. Because of the temperature of the duct and the return of part of the flaming exhaust gases, the rest of the charges burn without an igniter plug. This operating cycle or pulsation creates a loud buzzing The Pulsejet Engine 1-3 Figure 1-8 — The Aeropulse or pulsejet.

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