Discussion
Arrange the steps of sizing a subsonic inlet in order:
1. Choose a capture area from the engine's mass flow demand
2. Establish the engine's airflow requirement across the envelope
3. Check spillage drag at off-design conditions
4. Shape the diffuser to deliver low Mach number at the fan face
Select the correct sequence.
Answer: B
The engine states its demand, the capture area follows, the diffuser then slows the flow to what the fan wants, and the off-design penalty is assessed last. Choosing an area before knowing the demand would be arbitrary.
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