New Experiences on Transition Detection by Infrared Images

Abstract

With the usually existing temperature differenccs hctwccii thc modcl and the wind tunnel air, a temperature differcncc builds up between the laminar and the turbulent part of the model surface. As heat transfer in laminar flow is low, the laminar part keeps the model tcmpcrature. On the other hand in turbulent Ilow the hcat translcr IS high and therefore the model adopts nearly the i c q x " u r c of thc air.