In-Flight Investigations of Tollmien-Schlichting Waves
In-Flight Investigations of Tollmien-Schlichting Waves
复制标题
托尔米恩-施利希廷波的飞行研究
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
K. Horstmann
中科院分区：
文献类型：
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作者：
A. Seitz;K. Horstmann
进行飞行测试是为了更多地了解边界层转变中自然发生的托尔米恩-施利希廷波的技术重要情况。多元件热膜阵列放置在飞行试验台 LFU-205 的右侧机翼上，用于感测层流边界层中传播的 Tollmien-Schlichting 扰动引起的表面摩擦波动。实验数据的时间和空间傅里叶分析表明，信号中涉及 2d 和 3d Tollmien-Schlichting 波的宽带频谱，这是波包的典型特征。这些波包的出现是随机发生的，并且发现它们的强度和展向范围各不相同。对弦向分布的传感器的信号时间历史的检查表明，信号中的尖峰表明，湍流的破裂是从振幅最强的波包内开始的。
Flight tests were performed in order to learn more about the technically important case of naturally occurring Tollmien-Schlichting waves in boundary layer transition. A multi-element hot-film array, placed on the right hand wing of the flying test bed LFU-205, was used to sense skin friction fluctuations provoked by Tollmien-Schlichting disturbances propagating in the laminar boundary layer. Fourier analysis in time and space of the experimental data revealed that a broadband spectrum of 2d and 3d Tollmien-Schlichting waves is involved in the signals, typical for wave packets. Occurrence of these wave packets happens stochastically and it was found that they vary in intensity as well as in their spanwise extent. Examination of signal time histories from sensors distributed in chordwise direction showed that breakdown to turbulence, indicated by spikes in the signal, starts from within the wave packets with the strongest amplitudes.