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Considering only tunnel Mach numbers of 1.5, 2 and 3, with test section cross-sectional areas of 6 x 6 in and 12 x 12 in

Considering only tunnel Mach numbers of 1.5, 2 and 3, with test section cross-sectional areas of 6 x 6 in and 12 x 12 in and a diffuser divergence angle of 3°; calculate the following. 

An angle of the sidewalls of the test section that would be required to keep the Mach number in the test section constant. Use a test section length of 2 times its height.

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