Skin-Friction Measurements on a Rotor in Hover

摘要

A means of acquiring skin-friction measurements on a fixed wing using an oil-flow interferometric technique was developed at Ames in the early 1990s. As long as flow conditions are steady, as they are in hover, this technique can be applied to rotary wings also. During the March 1997 hover test of a full-scale XV-15 tiltrotor in the Ames 80- by 120-Foot Wind Tunnel, this technique was used for the first time to provide detailed skin-friction measurements on a rotor over a wide range of thrust conditions.