Expert: Paul Soderman - 5/6/2009

Question
Hi, my question regards a rotating sting for a supersonic
wind tunnel. Since the model has to rotate in the wind
tunnel, how would you apply the area ratio over 360
degrees? Can you explain how? or perhaps refer me to a book
that can explain it to me?

Many thanks

Answer
Deesha
I don't understand your question.  By area ratio are you referring to the supersonic area rule.  Or are you referring to a wind tunnel interference effect.  If the former I would refer you to Ashley and Landahl:  Aerodynamics of Wings and Bodies.  Dover press... and Lomax and Heaslet:  Recent Developments in the Theory of Wing-Body Wave Drag; J. Aeron. Science 23, no. 12, 1061-1074, 1956. If the latter, I refer you to Rae and Pope:  Low-Speed Wind Tunnel Testing; Wiley Interscience.
Paul