Investigation of the effects of a compliant surface on boundary-layer stability
Investigation of the effects of a compliant surface on boundary-layer stability
复制标题
研究柔顺表面对边界层稳定性的影响
DOI：
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发表时间：
1995
影响因子：
3.7
通讯作者：
W. Schwarz
中科院分区：
文献类型：
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作者：
Timothy H. Lee;M. Fisher;W. Schwarz
在低湍流度风洞中研究了被动式单层粘弹性柔性表面对Blasius边界层稳定性的影响。用热线风速仪测量了振动带激发的谐波的波长和增长率。具有不同的剪切模量，材料阻尼系数，和厚度的三个顺应性表面的数据进行了比较，刚性表面的数据。流动引起的表面位移测量使用电光位移传感器。结果表明，与刚性表面相比，柔性表面上不稳定Tollmien-Schlichting波的增长率和（F，Rδ*）平面内不稳定区域的范围都减小了。Tollmien-Schlichting波的抑制伴随着由流场在激励频率下驱动的表面运动。实验结果表明，延迟的发病湍流是可能的，在空气中使用适当的调谐表面特性。对三维扰动模式、流致表面不稳定性和破裂过程的研究还需要进一步的实验。
Some of the effects of a passive, single-layer, viscoelastic compliant surface on the stability of a Blasius boundary layer were investigated in a low-turbulence wind tunnel. Measurements of the wavelength and growth rates of vibrating-ribbon-excited harmonic waves were made by hot-wire anemometry. The data for three compliant surfaces with different shear moduli, material damping coefficients, and thicknesses were compared to rigid-surface data. The flow-induced surface displacements were measured using an electro-optic displacement transducer. The results show that the growth rates of unstable Tollmien–Schlichting waves, and the extent of the unstable region in the (F, Rδ*)-plane are reduced over the compliant surfaces relative to those over a rigid surface with the absence of flow-induced surface instabilities. The suppression of the Tollmien–Schlichting waves is accompanied by a surface motion driven by the flow field at the excitation frequency. The experimental results suggest that a delay of the onset to turbulence is possible in air by using appropriately tuned surface characteristics. Further experiments are needed to study the three-dimensional disturbance mode, the flow-induced surface instabilities and the breakdown process.