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Prandtl relation for normal shock waves is_______

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Prandtl relation for normal shock waves is_______

(a) a^2=u1u2

(b) a^*2=u1u2

(c) a*a0=u1u2

(d) a\(_0^2\)=u1u2

I got this question during a job interview.

My query is from Flow Compressible topic in chapter Normal Shock Waves of Aerodynamics

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Right option is (b) a^*2=u1u2

To elaborate: The Prandtl relation for the normal shock waves taking into account combined form of mass and moment equation and alternate forms of the energy equation. The final equation comes out in the form of a^*2=u1u2, where u1, u2 are velocities before and after the normal shock.

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