Shock detection on airfoils by means of piezo foil- and hot filmarrays

摘要

The authors describe comparative investigations concerning thedetection of shock positions on a transonic airfoil model. A piezo foilarray consisting of 24 separate sensors and a hot film array consistingof 8 separate sensors were used. While the piezo sensors detectincreasing unsteady fluctuations of pressure, wall shear stress, andtemperature in the region of a shock, the hot film sensors only registershear stress fluctuations qualitatively and, if calibrated, the meanwall shear stress too. Owing to their low total height, the two sensorarrays can be mounted on the airfoil model without causing disturbances,and they allow reliable detection of shock positions