If operational requirements for turbojet-powered aircraft require inlet to operate off-design at reduced inlet mass-flows, theoretical additive drag can be significant in magnitude, compared to basic aircraft drag; this could be equivalent to large penalties in range; proper cowl design will allow much of potential drag increment to be cancelled by a cowl suction force; for subsonic inlets at subsonic Mach numbers, test results show that about 80% of theoretical additive drag can be recovered with reasonably short and thin cowl; for same subsonic inlets at low supersonic Mach numbers, about 50% to 60% can be recovered; other findings.
Additive drag on inlet cowls and its effect on aircraft performance
AGARDograph
1965 Inlets
1965
30 pages
Conference paper
English
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Effect of inlet additive drag on aircraft performance
AIAA | 1964
|Effect of inlet additive drag on aircraft performance
AIAA | 1965
|