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Reducing transonic wind tunnel sting interference effects for concealed store release testing
Journal of Aerospace Engineering
  • Graham Doig, California Polytechnic State University, San Luis Obispo
  • Goran Bogdan, University of New South Wales
  • Kaveh R Kabir, Macquarie University, Australia
  • Murray R Snyder, George Washington University
Publication Date
10-1-2015
Abstract
Internal weapons bays are becoming increasingly common on aircraft for reasons of stealth and aerodynamic performance, and will be even more prevalent on coming generations of unmanned combat aerial vehicles (UCAVs). Wind tunnel testing of store releases to assess forces and moments for safety and clearance must be conducted with a store mounted to an angled strut rather than a conventional rear sting, to allow the full range of motion as the store “drops” from inside the aircraft. Interference from this strut can disrupt the flowfields and thus the reliability of moments obtained, and therefore an investigation was conducted to quantify the potential extent of discrepancies; original small-scale transonic wind tunnel testing was undertaken in a limited program which was supported by extensive numerical work. It was concluded that the precise geometry of the strut/store interface was of critical importance, with a typical design producing non-linear interference at high angles of attack. A simple improved design is proposed – making use of a blended interface and a more appropriate supercritical aerofoil strut cross section – yielding marked improvements in force and moment predictions.
Disciplines
Number of Pages
15
Citation Information
Graham Doig, Goran Bogdan, Kaveh R Kabir and Murray R Snyder. "Reducing transonic wind tunnel sting interference effects for concealed store release testing" Journal of Aerospace Engineering Vol. 230 Iss. 7 (2015) p. 1284 - 1298
Available at: http://works.bepress.com/gcdoig/28/