Accession Number : ADA112190

Title :   A Numerical Investigation of Two-Dimensional, Subsonic, Linear, Wind Tunnel Interference Theory,


Personal Author(s) : Pollock,N

PDF Url : ADA112190

Report Date : Jun 1981

Pagination or Media Count : 42

Abstract : An investigation of two-dimensional, subsonic, linear wind tunnel interference using the computer program TSFOIL as a 'numerical tunnel' has been carried out for solid, open, porous and slotted walls. The use of a computer code rather than physical experiment has the advantage that test parameters such as wall characteristics and model chord can be varied widely at low cost. The aim of the investigation was to determine the relative merits of the various walls and to establish the limits of applicability of linear interference theory. The most favourable wall type was found to be an ideal slotted wall with the slot parameter appropriate for zero solid blockage (F=1.1844). For this wall type linear interference theory accurately predicted lift and pitching moment corrections for tunnel height to chord ratios greater than 2 and supersonic region height to tunnel height ratios less than 0.2.

Descriptors :   *Two dimensional flow, *Subsonic flow, Wind tunnel tests, Walls, Theory, Numerical analysis, Computer programming, Machine coding, Airfoils

Subject Categories : Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE