Impingement heat transfer from the rib roughened surface within 2 dimensional arrays of circular jet has been experimentally investigated.
实验研究了二维圆射流阵列冲击肋粗糙表面换热。
Instead of using wings, the coleopter employed a circular extension serving as the outer part of the jet engine while helping the aircraft achieve level flight, as well as vertical ascent and landing.
环翼机没有尾翼，而是采用一个延伸的圆形作为外部引擎，帮助飞机完成水平飞行和垂直起飞降落。
The heavier cloud cover to the north and west of this circular pattern was likely a response to a low-pressure system and to jet stream dynamics.
圆形的云型中，北部和西部云量更多，这可能是由于低压系统和急流的作用。
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