Question

Select the incorrect statement for the properties concerned with a flow.

(a) a* and a0 are constant at a point

(b) a* and a0 are constant along the streamline for an adiabatic, inviscid, steady flow

(c) a* and a0 are constant along the entire flow for an adiabatic, inviscid, steady flow

(d) a* and a0 are related but not equal

This question was posed to me in an interview for job.

I need to ask this question from The Basic Normal Shock Equations in chapter Normal Shock Waves of Aerodynamics

Answer 1

The correct answer is (c) a* and a0 are constant along the entire flow for an adiabatic, inviscid, steady flow

For explanation: a* and a0 are the defined properties of the flow, constant at a point. They are related to each other but not same. For an adiabatic, inviscid, steady flow they are constant along the streamline. And if all the streamlines are coming from same uniform free-stream, they are constant along the entire flow.