Discussion
Match each shock feature in List I with its description in List II.
List I
A. Mach wave
B. Weak oblique shock
C. Strong oblique shock
D. Detached bow shock
List II
1. Leaves the flow subsonic, and appears only under an imposed back pressure
2. An infinitesimally weak wave, effectively isentropic
3. Usually leaves the flow supersonic and is the solution normally observed
4. Stands off ahead of a body when no attached solution exists
Select the correct match.
Answer: C
These four cover the whole range of shock strengths. A Mach wave is the vanishing limit, the weak and strong branches are the two roots of the theta-beta-Mach relation, and the detached bow shock is what forms once the deflection asked for exceeds anything an attached shock can supply.
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