Effect of External Components on V-22 Aircraft Forward-Flight Aerodynamics

Abstract

The effects of protuberances, forward-looking infrared, AAR47 sensor fairing, and refueling boom on V-22 forward e ight aerodynamics using computational e uid dynamics are investigated. The multizone Navier ‐Stokes method isapplied to thee ow over a complete V-22 wing ‐fuselage‐nacellecone guration, with and without external components. The angle of attack varies from 0 to 16 deg in forward e ight. A slight increase in drag is found at 0-deg angle of attack for an aircraft cone gured with the external units; this effect decreases as the angle of attack increases from zero to moderate values. However, at high angles of attack, the added e ow disturbances due to attachments seems to worsen tail buffeting and lift-to-drag ratio. The numerical results are in general agreement with recent e ight test data.