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Before the invention of precombustion chamber injection, air-blast injection was the only way a properly working internal air fuel mixture system could be built, required for a Diesel engine. During the 1920s, [2] air-blast injection was rendered obsolete by superior injection system designs that allowed much smaller but more powerful engines ...
The pump's air intake is filtered by a rotating screen or the vehicle air filter to exclude dirt particles large enough to damage the system. Air is delivered under light pressure to the injection point(s). A check valve prevents exhaust forcing its way back through the air injection system, which would damage the pump and other components.
In 1872, George Bailey Brayton obtained a patent on an internal combustion engine that used a pneumatic fuel injection system, also invented by Brayton: air-blast injection. [24]: 413 In 1894, Rudolf Diesel copied Brayton's air-blast injection system for the diesel engine, but also improved it.
The air intake must not draw in hot air; this would reduce the engine's power output. The engine has a Bosch injection pump. It is controlled by a centrifugal control mechanism using a pushrod. The control trap makes it possible to change the injection time at the engine start-up to pump more fuel into the cylinder.
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In this manner, the engine fired on every power stroke and speed and output were controlled solely by the quantity of fuel injected. Bosch later further developed this type of metered injection system. In 1890 Brayton filed a patent (granted in 1892) for another 4 stroke engine with an air blast fuel injection system ( U.S. patent# 432,260) .
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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. Valveless pulsejets are low in cost, light weight, powerful and easy to operate.