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The traditional valved pulsejet has one-way valves through which incoming air passes. When the fuel mix is ignited, the valves close, which means that the heated gases can only leave through the engine's tailpipe, thus creating forward thrust. The second type is the valveless pulsejet. [5]
In 1938 he demonstrated a pulse jet–powered pilotless bomber, but the project was shelved by the Air Ministry as the prototype lacked range and accuracy and was expensive to construct. That same year, however, the Argus Company began work on a flying bomb using Schmidt's engine. Schmidt later joined Argus in 1940. [2]
It does this because when the pulse ignites, there is still some exhaust gas in the exhaust pipe. That is sucked in before any additional oxygen is sucked in. Of course, the air intake pipe has already supplied the oxygen by that point and the pulse reignites. A valveless pulsejet (or pulse jet) is the simplest known jet propulsion device ...
Reed valves are used in the cheap but inefficient pulse jet engine, such as the one used by the Argus As 014 engine in the German V-1 (flying bomb). The valves at the front of the cylindrical engine are opened by the low pressure in the combustion chamber caused by the resonance of the air column in the engine, fuel is squirted into the ...
Argus 109-014: pulse jet engine for V-1 flying bomb and Tornado boat Argus 109-044: [ 4 ] Pulse jet similar to the Argus 109-014, but with "square intake" main valve bank at front Unmanned Aerial Vehicles
Argus As 014 (aka "Argus 109-014") – pulse jet engine for V-1 flying bomb and Tornado boat; Argus As 044 [37] Argus As 16 4-cylinder inverted inline 40 hp [37] Argus As 17 6-cylinder inverted inline 225 hp / 285 hp [37] Argus As 401 development and renumbering of the As 10; Argus As 402 [37] Argus As 410 12-cylinder inverted V [37]
The Valved pulsejet uses a combination of mechanical valve and aerodynamic valve; the mechanical valve at the front (controlling induction) and an aerodynamic valve operating in the tailpipe. The valveless pulsejet uses aerodynamic valves at both ends of the duct. So we now have partial confinement from both ends of the duct.
The Luftwaffe supported the project, and Schmidt's pulse engine, with extra development, was used to power the V-1 flying bomb, the first cruise missile. The engine was based on a 3.6 metre long tube resonator. It had a valve matrix at its entrance, and a laval nozzle at its exit, and used it for periodic re-ignition (at about 50 Hz). [7]