Discussion
Consider the following statements about a flat plate at incidence in supersonic flow:
1. The upper surface carries an expansion at the leading edge.
2. The lower surface carries an oblique shock at the leading edge.
3. The plate experiences no drag in inviscid flow.
Which of the statements given above is or are correct?
Answer: C
The first two correctly describe the wave pattern. The third is false: unlike the subsonic case, a supersonic plate carries wave drag even with no viscosity, because the pressures on its forward- and rearward-facing surfaces no longer balance.
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