Discussion
Statement I: A pitot inlet is suitable for flight at Mach 2.5.
Statement II: A normal shock at high supersonic Mach number destroys a large fraction of the total pressure.
In the light of the above statements, choose the correct answer.
Answer: A
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect: a pitot inlet is unsuitable at Mach 2.5.
Statement II is correct and explains why. A pitot inlet decelerates the flow through a single normal shock, and the total pressure loss across a normal shock grows rapidly with Mach number - at Mach 2.5 the recovery would be around 0.5, which is unusable. Supersonic inlets therefore use a system of oblique shocks, each weaker than a normal shock, with variable geometry to keep them correctly positioned.
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