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Vacuum engine
A vacuum engine (also called flame-licker engine) derives its force from air pressure against one side of the piston, which has a partial vacuum on the other side of it. At the beginning of an outstroke, a valve in the head of the cylinder opens and admits a charge of burning gas and air, which is trapped by the closing of the valve and expands. Towards the end of the stroke the charge comes into contact with a water- or air-cooled part of the cylinder and is chilled, causing a sudden drop in pressure sufficient to suck the piston – which is open towards the crank – back on the return stroke. The valve opens again in time for the piston to expel the burnt gases before the next outstroke begins.
==History==
(詳細はgas engines worked on the "vacuum" or "atmospheric" principle in a similar way to the Newcomen steam engine. A mixture of gas and air was drawn into the cylinder and ignited; the mixture expanded and part of it escaped through the exhaust valve; the valve then closed, the mixture cooled and contracted, and atmospheric pressure pushed the piston in. Such engines were very inefficient and were superseded by engines working on the Otto cycle.
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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