Abstract
This article discusses affordable schlieren methods which can visualize hidden details in three-dimensional high-speed flow. Mainly, two schlieren methods are brought to light, namely inclined schlieren and focusing schlieren. These two methods have been applied to visualize three-dimensional flow fields like normal shock boundary layer interaction in ducts and flows with shock–shock interactions. The paper explains the possibility of measuring normal shock oscillation in spanwise/transverse direction. Shock height variation across the duct span is also illustrated, using inclined schlieren. Scanning of the focusing schlieren setup can give planar views of three-dimensional shock–shock interactions. It is also shown that the two methods can be merged to give the inclined focusing schlieren method which can also be used to understand three-dimensional flow fields. Further, the possibilities and limitations of these flow visualization methods have been discussed.
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Vaisakh, S., Muruganandam, T.M. Affordable schlieren visualization methods for understanding three-dimensional supersonic flows. J Vis 23, 851–862 (2020). https://doi.org/10.1007/s12650-020-00662-x
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DOI: https://doi.org/10.1007/s12650-020-00662-x