Adopt ceramic nozzle can be the nozzle, that is set to zero height vent end direct contact with the surface is cut, can achieve very good result.

采用陶瓷外喷嘴可以将喷嘴高度设为零，即喷口端面直接接触被切割表面，可以获得很好的效果。

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The alcohol group burning nozzle comprises the pneumatic cutting knife, a tubular fixing seat, an air vent, a gas and liquid conduit, a fixing cap and a gas and liquid cutting seat.

醇基燃烧喷嘴含有所述气动剪切刀、管式固定座、通气孔、气液疏导管、固定帽和气液切割座。

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In this configuration, the HTP is passed over a catalyst pack to decompose it into steam and oxygen, but instead of igniting a fuel grain, this superhot gas is allowed simply to vent through the chamber nozzle.

BBC: Science & Environment