Boundary layer receptivity to freestream turbulence
Boundary layer receptivity to freestream turbulence
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DOI：
10.2514/6.1990-1504
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发表时间：
1990-06
影响因子：
3.7
通讯作者：
J. Kendall
中科院分区：
文献类型：
--
作者：
J. Kendall
弱但强度可调的自由湍流入射到平板试验模型上，引起Tollmien-Schichting（TS）波和波包。使用新开发的传感器对这些进行了研究，通过该传感器，可以从几乎最小临界雷诺数到转变开始的站点跟踪数据包。这些研究得出的结论是：（1）在Blasius边界层中，弱的自由脉动湍流引起TS波包，（2）波包在传播过程中通过横向和纵向尺度的扩展以及峰值振幅的增加而增强，（3）观测站的平均波强与自由脉动速度不成线性关系，和（4）包通常演变成湍流点。
Freestream turbulence of weak but adjustable intensity incident upon a flat plate test model induced Tollmien-Schichting (TS) waves and wave packets. These were studied using a newly-developed sensor by which the packets could be followed from a station nearly as far forward as the minimum critical Reynolds number to the onset of transition. Conclusions reached from these studies were: (1) weak freestream turbulence induced TS wave packets in a Blasius boundary-layer, (2) packets gained strength during propagation through expansion of lateral and longitudinal scales, and through an increase in peak amplitude, (3) the average wave strength at stations of observation was not related to the freestream velocity fluctuation in a linear manner, and (4) packets typically evolved into turbulent spots.