Accession Number : ADA470086


Title :   The Aerodynamic Performance of the Houck Configuration Flow Guides


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS


Personal Author(s) : Killian, Dermot N


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a470086.pdf


Report Date : Jun 2007


Pagination or Media Count : 184


Abstract : In an effort to explore efficient wing designs for UAV's, the Air Force is investigating the patented Houck Aircraft Configuration, which is a joined-wing aircraft with curved flow guides of varying camber connecting the upper and lower wingtips. Models were drawn in three-dimensions using Solidworks(registered) with upper and lower wings drawn as identical NACA 2412 airfoil sections for all models. A variety of airfoil sections between the upper and lower wingtips were drawn and rotated to achieve a combination of cant and angle of attack variation. Subsequently, a solid part was lofted through these sections and merged with the upper and lower wings. Each model was built by a rapid prototype machine. A six-component balance in the AFIT low-speed wind tunnel provided measurements yielding the aerodynamic data of each model. Comparisons are made to the same basic planform area without flow guides and to a case where the wingtips are joined with a flat plate. At a Reynolds number of 38K, the increase in skin friction drag outweighed any possible reduction of induced drag. However for Reynolds numbers in the 57K to 120K range, improvements in L/Dmax of about 2-5% over the no flow guide case were measured.


Descriptors :   *AERODYNAMICS , EFFICIENCY , THESES , VORTICES , FLOW VISUALIZATION , LOW VELOCITY , WIND TUNNEL MODELS , LIFT TO DRAG RATIO , WING TIPS , DRONES , WINGS , AIRCRAFT MODELS , WIND TUNNELS , HOT WIRE ANEMOMETERS


Subject Categories : Aerodynamics
      Research and Experimental Aircraft
      Test Facilities, Equipment and Methods


Distribution Statement : APPROVED FOR PUBLIC RELEASE