Discussion
Which of the following statement is NOT TRUE across an oblique shock wave?
Answer: D
The statement that is NOT TRUE is Static pressure increases, total temperature decreases.
A shock wave is adiabatic and does no work on the gas, so the total enthalpy, and for a perfect gas the total temperature, is the same on both sides. Total temperature does not decrease.
The other statements are true. Across an oblique shock the flow is compressed, so static pressure and static temperature both rise, while the shock is irreversible, so entropy rises and total pressure falls. Each true statement pairs one of these increases with constant total temperature or falling total pressure.
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