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.
本文首次利用数值模拟的方法对喷流换热中一组圆喷嘴射流的流动特性进行了研究，得出了有用的结论并进行了实验验证。
The flowing characteristics of jet through array of round nozzle in impingment heat transfer was investigated by numerical simulation.
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