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Blast Wave Reflection Vs Angle of Incidence

Blast Wave Reflection Vs Angle of Incidence

Blast Wave Reflection Vs Angle of Incidence

(OP)
I'm trying to understand a graph in the publication "Design of Blast Resistant Buildings in Petrochemical Facilities" published by ASCE.

On page 3-7 Fig 3.2a shows the relationship described in the subject of this post for a Shock Wave.  I fail to understand why the reflection coefficient Cr reaches a peak at an angle other than zero.  For example Ps/Po=0.136 has a peak Cr at an angle of incidence of about 67 degrees.

Can anyone explain why this is the case?

Thank you
 

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