Accession Number : ADA257343


Title :   Quantitative-Force Measurements of Pneumatic Control on a Wing/Strake Model


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Willson, James G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a257343.pdf


Report Date : Sep 1992


Pagination or Media Count : 119


Abstract : A low-speed wind-tunnel study to quantitatively measure the lift and drag effects of pneumatically controlling a leading edge vortex generated by a half-span, generic-fighter-wing model was conducted. The study measured the added lift and drag upon the model, throughout a range of angles of attack, utilizing blowing tubes of different geometry and orientations. The effects of blowing upon the high pressure side of the strake were also investigated. Results showed that the effects of blowing were limited to changes in lift with no apparent changes in drag. Blowing appeared to reattach the flow during the initial stages of wing stall. Blowing increased lift by a maximum of 3.75% at angles of attack greater than 25 degrees. The effects of blowing appeared oscillatory with respect to angle of attack. Blowing rates were varied from Cmu = 0.0 to 0.0035 in an attempt to determine an optimum. It was found that changes in blowing rates had little effect upon delta CL. Strake, Vortex control, Blowing, Vortex interaction, Enhanced lift.


Descriptors :   *AERODYNAMIC DRAG , *WINGS , *LIFT , *WIND TUNNELS , VELOCITY , CONTROL , MODELS , INTERACTIONS , EDGES , GEOMETRY , FLOW , DELTAS , TUBES , STRAKES , DRAG , LEADING EDGES , ATTACK , RATES , HIGH PRESSURE , ANGLE OF ATTACK , PRESSURE


Subject Categories : Aerodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE