这些装置没有反馈管来控制主喷流，也没有射流的附壁效应。它们的结构很简单可以自激振荡。
These devices have neither feedback pipes to control the main jet nor wall attachment effect of the jet on them.
研究了自由涡射流对透射激光产生的气动透镜效应，给出了计算结果。
The aerodynamic lens effect of laser beam through aerodynamic window is investigated and the conclusion is provided.
在理论分析了水中等离子体产生机理及其推进效应的基础上，建造了由水射流等离子弧推进系统、供水系统及控制系统组成的推进模型。
The thrust model made of propulsion system, water supply and control system was designed on the basis of analysis on the mechanism of water plasma and thrust effect.
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