Ground-to-air flow visualization using Solar Calcium-K line Background-Oriented Schlieren

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• 作者：Michael A. Hill ; Edward A. Haering Jr.
• 刊名：Experiments in Fluids
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：58
• 期：1
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-1114
• 卷排序：58

文摘

The Calcium-K Eclipse Background-Oriented Schlieren experiment was performed as a proof of concept test to evaluate the effectiveness of using the solar disk as a background to perform the Background-Oriented Schlieren (BOS) method of flow visualization. A ground-based imaging system was equipped with a Calcium-K line optical etalon filter to enable the use of the chromosphere of the sun as the irregular background to be used for BOS. A US Air Force T-38 aircraft performed three supersonic runs which eclipsed the sun as viewed from the imaging system. The images were successfully post-processed using optical flow methods to qualitatively reveal the density gradients in the flow around the aircraft.