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Which of these characteristics vary as a result of chemically reacting gas compared to the perfect gas?

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Which of these characteristics vary as a result of chemically reacting gas compared to the perfect gas?

(a) Pitching moment coefficient

(b) Temperature

(c) Drag

(d) Lift

I got this question during an internship interview.

I would like to ask this question from Hypersonics and Computational Fluid Dynamics topic in division Numerical Techniques for Nonlinear Supersonic Flow, Elements of Hypersonic Flow, Couette and Poiseuille Flow of Aerodynamics

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Right choice is (a) Pitching moment coefficient

The explanation: Chemically reactive flow affects the pitching moment over the space shuttle in hypersonic flow. Usually, for a chemically reactive gas, the pressure on the forward part of the shuttle body is higher and it is lower in the rearward part. This leads to a positive pitching moment of the shuttle.

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