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.

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实验研究表明，利用喷流的有益干扰，可使主弹体零阻显著下降，从而得到一种优化的后体外形。

Experiment investigation shows: The main body zero drag can be reduced by faovurable interference of jet flow. Then an optimuns afterbody configuration can be obtained.

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