IGTC-79 MEASUREMENT OF THE RADIAL FLOW ALONG A LOW SPEED COMPRESSOR BLADING DURING UNSTALLED AND STALLED OPERATION(Session B-11 Unsteady Aerodynamics II)

概要

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A single stage low speed axial flow compressor is used to investigate the radial drift along the rotor blade during unstalled and stalled operation. V-shaped hot wire sensors are installed at 0.4mm from the blade surface on three chordwise locations. The hot wire signals are digitized and processed using a fast Fourier Transform and the phase locked averaging technique. A radial drift along the suction surface is observed in the unstalled region. The occurrence of rotating stall causes a large inward motion in the front part of the channel (-30°) and a radially outward drift of +60°at the 50% chord position. The combination of these observations in the relative motion and the absolute measurements suggest that there exist a large recirculation in the rotating blades.
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