Figure 5 Position of the PIV measurement windows with respect to the blade section The PIV system is composed of a Litron NANO-L-200-15 Nd:Yag double pulsed laser with 200 mJ output energy and a wavelength of 532 nm and an Imperx ICL-B1921M CCD camera with a 12 bit, 1952 x 1112 pixel array. The laser was positioned on the top of the wind tunnel test section while the camera is positioned on one side of the test section. The camera was equipped with a Nikkor 50 mm lens. The synchronization of the laser pulses with the camera exposure was controlled by a 6 channel Quantum Composer QC9618 pulse generator. The digital encoder signal mounted on the oscillating model triggered every 1/rev the laser and the camera at the angle of attack of the oscillating model required for the test. The digital images were captured using a GigaEthernet EBus connection. A particle generator PIVpart30 by PIVTEC with Laskin atomizer nozzles was used for the seeding, consisting in small oil droplets with diameter in the range of 1-2 Lm...