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A shock polar is a diagram that plots, for a fixed upstream Mach number,

  • A.The relationship between flow deflection and downstream velocity components
  • B.Entropy against temperature across the shock
  • C.Pressure against density along the Hugoniot curve
  • D.Shock thickness against Mach number

Answer: A

The shock polar maps the locus of possible downstream velocity vectors for all admissible shock angles at a given upstream Mach number. It shows at a glance the two solutions for each deflection, the maximum deflection where they merge, and the point at which the downstream flow becomes sonic.

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