Discussion
Match each phenomenon in List I with where it occurs in List II.
List I
A. Inlet buzz
B. Spillage drag
C. Re-ingestion
D. Jet mixing noise
List II
1. At the inlet when the engine swallows less than is captured
2. At a supersonic inlet with an unstable shock system
3. At the exhaust shear layer
4. During reverse thrust at low ground speed
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
Each phenomenon is matched to where it arises. Inlet buzz (A) occurs at a supersonic inlet with an unstable shock system (2). Spillage drag (B) occurs at the inlet when the engine swallows less than is captured (1).
Re-ingestion (C) occurs during reverse thrust at low ground speed (4), when the aircraft no longer outruns its own efflux. Jet mixing noise (D) arises at the exhaust shear layer (3). Two belong to the inlet, one to the exhaust and one to a transient ground condition.
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