Know Which Way the Wind Blows

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Know Which Way the Wind Blows

机译：知道风向

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IN THE EARLY DAYS OF FLIGHT, wind tunnels were as unsophisticated as the airplanes they tested. Put a box fan in a circuit of ductwork and you'll have a pretty good representation of an early wind tunnel. Arguably the most important advancement, as well as the most critical component, was the converging nozzle, which modestly accelerated airflow. You can accelerate the airflow from a fan or compressor by constricting the area the air is flowing through. But regardless of the number or power of tunnel compressors working to increase airflow, the fastest speed the early tunnels could achieve was Mach1.

机译：在飞行的早期，风洞就像他们测试的飞机一样简单。将风箱风扇放在管道系统中，您会很好地表示早期的风洞。可以说，最重要的进步也是最关键的组成部分是收敛喷嘴，它适度地加速了气流。您可以通过限制空气流过的区域来加速风扇或压缩机的气流。但是，不管隧道压缩机的数量或功率如何增加气流，早期隧道可以达到的最快速度是Mach1。

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《Air and Space》 |2011年第3期|p.64|共1页
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Know Which Way the Wind Blows

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