The Effect of Strakes on Vortical Flows Applied to Aircraft.
Final scientific rept. 30 Apr 83-31 Jan 84,
VON KARMAN INST FOR FLUID DYNAMICS RHODE-SAINT-GENESE (BELGIUM)
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The influence of strakes placed along vortical flows has been determined in order to define ways of drag reduction on wake-like flow fields present on aircraft afterbodies. Strakes of different aspect ratio and thickness were tested at different angles of incidence with respect to a vortex path in order to evaluate the best configuration which can reduce, or minimise, the cross flow kinetic energy, thus the vortex drag of a vortical flow. The flow field in the vicinity of the boattail of a scale cargo aircraft was studied. The aircraft was tested with and without strakes placed on its afterbody, the results confirm that when strakes are properly placed on the boattail, a reduction in drag is achievable. Author