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A pulsejet engine (or pulse jet) is a type of jet engine in which combustion occurs in pulses. A pulsejet engine can be made with few [ 1 ] or no moving parts , [ 2 ] [ 3 ] [ 4 ] and is capable of running statically (that is, it does not need to have air forced into its inlet, typically by forward motion).
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 ...
The pulse detonation engine is a concept currently [when?] in active development to create a jet engine that operates on the supersonic detonation of fuel. Because the combustion takes place so rapidly, the charge (fuel/air mix) does not have time to expand during this process, so it takes place under almost constant volume .
Solenoid valves. A solenoid valve is an electromechanically operated valve.. Solenoid valves differ in the characteristics of the electric current they use, the strength of the magnetic field they generate, the mechanism they use to regulate the fluid, and the type and characteristics of fluid they control.
An actuator can be just a mechanism that is directly driven by the motions or forces of other parts of the system. An example is the camshafts that drive the intake and exhaust valves in internal combustion engines, driven by the engine itself.
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.