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27-06-2020 | Regular Paper | Issue 5/2020

Journal of Visualization 5/2020

Affordable schlieren visualization methods for understanding three-dimensional supersonic flows

Journal:
Journal of Visualization > Issue 5/2020
Authors:
S. Vaisakh, T. M. Muruganandam
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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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