A simple automated hot-wire positioning technique for near-wall measurements

4 Summary A simple hot-wire sensor positioning technique is presented. The technique is easily integrated with a personal computer to achieve a completely automated system. A single initial calibration of the system outside of the test section is all that is necessary and no subsequent manual re-positioning is required during experimentation. This gives the capability of performing multiple measurements of near-wall velocity at different locations on a wall surface without the need of cumbersome and extensive alignment of the traverse system with respect to the wall surface. Preliminary tests indicate that the technique is viable for near-wall velocity measurements.