Experiences from Flow Field Measurements in Industrial Transonic Wind Tunnels for Comparison with Numerical Results

Abstract

The progress made at the development of modern flow measurement techniques as Particle-Image Velocimetry (PIV) and Pressure Sensitive Paint (PSP) allow to provide flow data of increased quality and accuracy. Particularly PIV and PSP are able to capture a huge amount of experimental data during a wind tunnel test campaign. PIV provides instantaneous as well as averaged flow velocity fields in different planes of the flow and allows the detection of large and small spatial flow structures. Using PSP the pressure distribution on a whole surface can be determined giving much more insights in details of the flow topology than would be possible by discrete pressure taps. The combined application of both techniques offer new possibilities for detailed flow investigations but also will provide possible an excellent data base for comparisons with numerical results.