Surface pressure and near rotor velocity measurements, using a laser Doppler facility, have been made at six radial positions for a 1 m diameter two-bladed rotor (based on the LM 17 m design), over the stalling range of tip speed ratios at typical Reynolds' numbers of 300 000. Velocity measurements have been used to quantify local incidence and results illustrate clearly the development of enhanced lift incidence due to a delay in the loss of leading edge suction peaks compared to 2D behaviour. Static hysteresis in the stall behaviour has also been identified. Power comparisons with full scale data indicate fairly good agreement in peak power coefficient and tip speed ratio at the onset of stall but also show significant Reynolds number effects in the stalling and post stall regions.
