A control scheme is proposed, in which liquid engine of constant thrust and impulse thruster are chosen to achieve hover task.

提出一种近月面定点悬停的控制方案，选用常推力液体发动机和脉冲式发动机实现悬停任务。

youdao

When calculations are compared with the performance parameters of solid engine and liquid engine, it is concluded that PDE has very superior performance. It is necessary to continue research on PDE.

最后将算例的计算结果与常规液体火箭发动机及固体火箭发动机的相关参数作了对比，脉冲爆震发动机具有更优越的整体性能，因此，有必要对它进行更进一步的研究。

youdao

One of the four-engine cutoff, or ECO, sensors inside the liquid hydrogen section of the tank gave a false reading.

四个引擎中的一个关车(eco)，燃料箱中液氢燃料区的一个传感器给出了错误的读数。

youdao

He said he believed his liquid air engine would prevail against other storage technologies because it did not rely on potentially scarce materials for batteries.

BBC: Liquid air 'offers energy storage hope'

To get to them, the company teamed with Porsche to build a liquid-cooled engine.

FORBES: Love into Money

Previous attempts to make an engine with liquid pistons have foundered for the obvious reason that liquids are less stable than solids.

ECONOMIST: An engine made of water