Discussion
A supersonic aircraft designed for Mach 2 is found to suffer inlet buzz above Mach 1.6.
What does this indicate about the inlet?
Answer: A
Correct answer: The shock system is unstable and mismatched
Buzz is an unsteady oscillation of the shock system, and it occurs when the inlet is running away from its matched condition - typically capturing more air than the engine will swallow, so the terminal shock is expelled and drawn back repeatedly.
That it appears from Mach 1.6 on an aircraft designed for Mach 2 says the geometry is correct only near the design point and the schedule is wrong below it. A diffuser that is too long, or an oversized diverter, would degrade recovery steadily rather than produce an instability.
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