An incident weak oblique shock is reflected as a weak oblique shock from the wall, as shown. Which relation between shock angles β₁, β₂ and flow-deflection magnitudes θ₁, θ₂ is correct?
The reflected shock turns the flow back parallel to the wall, so θ₂=θ₁ in magnitude. The first shock reduces Mach number. On the weak-shock branch, producing the same turning angle at the lower incident Mach number requires a larger shock angle. Thus β₂>β₁, B.
More Compressible flows: isentropic flow, normal and oblique shocks, Prandtl-Meyer flow, nozzles and diffusers questions
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