Spreading of a turbulent disturbance.
Spreading of a turbulent disturbance.
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骚乱的蔓延。
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
M. Fischer
中科院分区：
文献类型：
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作者：
M. Fischer
文中给出了局部马赫数对相对于壁面的湍流扰动传播角和横向扰动传播角的影响。几乎所有相对于壁面的扰动角都是通过调查来确定的，调查中获得了‘层流’边界层的热线等值线或热膜调查。横向扰动扩散角是从各种条件的调查中获得的，包括湍流爆发、横向污染的报告观测和观测的过渡流。指出相对于壁面的扰动扩展角随马赫数的变化基本不变，而侧向扩展角随马赫数的增大而急剧减小。横向扰动扩展角数据与湍流射流扩展角随马赫数变化的数据具有很好的一致性，表明在横向尺度上，边界层中的湍流发展可能基本上没有壁面约束(类似于自由剪切层)。
The presented paper shows the effect of local Mach number on the turbulent disturbance spreading angle relative to the wall and on lateral disturbance spreading angles. Almost all the disturbances angles relative to the wall were determined from investigations where hot-wire contours or hot-film surveys of a 'laminar' boundary layer were obtained. Lateral disturbance spreading angles were obtained from investigations of various conditions including turbulent bursts, reported observations of transverse contamination, and observed transitional flow. It is noted that the disturbance spreading angle relative to the wall seems to remain essentially invariant with Mach number, while the lateral spreading angle decreases sharply with increasing Mach number up to about 6. The good agreement between lateral disturbance spreading angle data and data for the variation of turbulent jet spreading angle with Mach number implies that in the lateral dimension, turbulence in a boundary layer may develop essentially free of wall constraints (similar to a free shear layer).