Investigation of the Calmed Region Behind a Turbulent Spot
Investigation of the Calmed Region Behind a Turbulent Spot
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调查湍流点背后的平静区域
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
N. Melwani
中科院分区：
文献类型：
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作者：
J. Gostelow;G. Walker;W. J. Solomon;G. Hong;N. Melwani
本文给出了在受控扩散逆压梯度作用下，触发波包和湍流斑后平静区的风洞实验测量结果。轴流压气机的定子叶片也进行了类似的测量，转子尾流的通过引起了湍流斑。其目的是获得一个升值的湍流点的行为下，一个强大的逆压梯度的基础上，更准确地模拟点及其环境的过渡边界层流动的预测。在逆压梯度下，点后的平静区很大;它与周围紊流层的相互作用很复杂，取决于周围自然边界层是层流还是紊流。一些见解收集有关的行为的平静的区域，随后将被用于试图模拟平静的区域。尽管这些对平静区的基本研究已经广泛开展，但仍有许多问题有待了解。
Measurements are presented of the calmed region behind triggered wave packets and turbulent spots under a controlled diffusion adverse pressure gradient in a wind tunnel. Similar measurements are also presented from the stator blades of an axial flow compressor, where turbulent spots are induced by the passing of rotor wakes. The purpose is to gain an appreciation of turbulent spot behavior under a strong adverse pressure gradient as a foundation for the more accurate modeling of spots and their environment in predictions of transitional boundary layer flows. Under an adverse pressure gradient the calmed region behind the spot is extensive; its interaction with the surrounding turbulent layer is complex and is dependent on whether the surrounding natural boundary layer is laminar or turbulent. Some insights are gleaned concerning the behavior of the calmed region which will subsequently be used in attempts to model the calmed region. Although these fundamental investigations of the calmed region have been extensive much remains to be understood.Copyright © 1996 by ASME