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pulsejet
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〔(【引用サイトリンク】title=Pulse Detonation Engine )〕 or no moving parts,〔()〕〔(【引用サイトリンク】title=Patent US6216446 - Valveless pulse-jet engine with forward facing intake duct - Google Patents )〕〔(【引用サイトリンク】title=Valveless Pulsjet )〕 and is capable of running statically (ie it does not need to have air forced into its inlet typically by forward motion).
Pulsejet engines are a lightweight form of jet propulsion, but usually have a poor compression ratio, and hence give a low specific impulse.
One notable line of research of pulsejet engines includes the pulse detonation engine which involves repeated detonations in the engine, and which can potentially give high compression and good efficiency.
==Types==
There are two main types of pulsejet engines, both of which use resonant combustion and harness the expanding combustion products to form a pulsating exhaust jet which produces thrust intermittently.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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