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首页> 外文期刊>Journal of Mechanical Science and Technology >Flow characteristics along and above dimpled surfaces with three different dimple depths within a channel
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Flow characteristics along and above dimpled surfaces with three different dimple depths within a channel

机译：沿凹坑表面及上方具有三个不同凹坑深度的凹坑内的流动特性

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摘要

The effects of dimples in altering time-averaged flow behavior occur mostly within one-half of one dimple print diameter from the surface, and the dimples within the arrays periodically eject a primary vortex pair from each dimple, which exists in conjunction with edge vortex pairs that form along the spanwise edges of staggered dimples regardless of three dimple depths. As the dimple depth increases, deeper dimples eject stronger primary vortex pairs, with hig her levels of turbulence transport due to larger deficits of time-averaged, normalized total pressure and streamw ise velocity as the surfaces with deeper dimples are approached. Primary vortex pair ejection frequencies range about 7–9 Hz, and edge vortex pair oscillation frequencies range about 5–7 Hz forR eH =20,000, regardless of dimple depths.
机译：凹痕在改变时间平均流动行为方面的影响主要发生在表面上一个凹痕印刷直径的一半内，并且阵列中的凹痕周期性地从每个凹痕中弹出一个初级涡流对，该初级涡流对与边缘涡流对一起存在沿交错的凹坑的翼展方向边缘形成的区域，与三个凹坑深度无关。随着凹坑深度的增加，较深的凹坑会喷射出更强的初级涡流对，这是由于随着接近深凹坑的表面的平均时间，归一化总压力和流速度的更大缺陷，其湍流传输水平得以提高。对于R eH = 20,000，无论酒窝深度如何，一次涡旋对的喷射频率范围约为7–9 Hz，而边缘涡旋对的振荡频率范围约为5–7 Hz。

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