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Visualization and Echo Sounding of Stratified Fluid Disturbances in Front of and Behind a Vertical Plate
Doklady Physics ( IF 0.8 ) Pub Date : 2020-08-18 , DOI: 10.1134/s1028335820040047
Yu. D. Chashechkin , V. E. Prokhorov

Abstract

With the use of the schlieren visualization and echo sounding method, the spatial structure of disturbances in front of a plate and behind it is investigated for the first time in the flow regime of intense internal-wave generation. In the echograms, fine structures are detected both in the upstream disturbances and in the wake within the solid-motion layer. In the schlieren graph, the fields of upstream disturbances are smooth, and thin interfaces are expressed in the confluent wake. Local peaks in the spatial disturbance spectra are expressed on scales that slightly exceed the length of internal waves, and, to a lesser extent, for lower scales. The thinnest interfaces are observed in the schlieren image of the wake immediately behind the plate.


中文翻译:

垂直板前后的分层流体扰动的可视化和回声测深

摘要

通过使用schlieren可视化和回声测深方法,首次在强烈的内波产生流场中研究了板前和板后扰动的空间结构。在回波图中,在上游干扰和固体运动层内的尾流中都检测到了精细的结构。在schlieren图中,上游扰动场是平滑的,并且在汇合的尾流中表示出较薄的界面。空间扰动谱中的局部峰以略大于内部波长度的标度表示,而在较小范围内以较小的标度表示。最薄的界面在板后面紧随其后的尾波的schlieren图像中观察到。
更新日期:2020-08-18
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