[khemraj]

Can we use isentropic relation across compression waves near compression corner? If yes, how compression waves result to non isentropic shock? If No, why?

[FMDenaro]

Originally Posted by khemraj

Can we use isentropic relation across compression waves near compression corner? If yes, how compression waves result to non isentropic shock? If No, why?

If you are talking about steady flows, the shock waves are not isoentropic.

However, if you have a look to the Zucrow's textbook, you will find the omoentropic compression flow produced by a piston moving in a cylinder. This model is valid until the compression waves produce a singularity by coalescence.

[aerosayan]

Shockwaves are non-isentropic, as the process is irreversible, hence the entropy of the entire system decreases. However, the total enthalpy remains constant. Cool stuff, shockwaves.


https://www.grc.nasa.gov/WWW/k-12/airplane/oblique.html