Experimental test

The first test campaign concerned the isolated PFSU profile for which a large amount of well-documented data has been obtained during the experi­ments located at Onera Modane in the S3 transonic wind tunnel. Steady and unsteady measurements have been performed for inlet Mach numbers of 0.5 to 0.75, with various static incidence angles (0 to 5 degrees) and pitching move­ments of the profile at a frequency of 40 Hertz. Beside this, the LDV (Laser Doppler Velocimetry) technique was used to assess the velocity profile in the vicinity of the profile, in order to get a proper description of the separated zone, which occurs at the leading edge.

The second test campaign aimed at improving the knowledge of the aerody­namic fbw field around the central blade of a straight blade cascade (Leconte et al., 2001). This test took place in ONERA R4 blow-down wind-tunnel for both steady and unsteady configurations. Conventional measurement techniques such as steady and unsteady pressure recording on the surfaces of the blades were used. To acquire a knowledge of the flow velocity field in the channels contiguous to the central blade of the cascade, PIV (Particle Image Velocime – try) technique was used. The test matrix featured various Mach numbers (sub – sonic, transonic and supersonic), cascade angle-of-attack, plunging and pitch­ing movements of the central blade.