The laser Doppler velocimeter, a new instrument capable of making nondisturbing gas velocity measurements, was used to investigate the flowfield within the rotating blade row of a low speed axial compressor. The velocimeter operates by measuring the transit time of a seed particle across interference fringes produced at the intersection of a split and crossed laser beam. The velocity (magnitude and direction) measurements made with the laser at the rotor inlet and discharge generally agreed within 2 to 3 per cent with measurements made with a hot film anemometer, pitot-static probe and wedge and tuft angle probes. Detailed flowfield measurements within the rotor passage were then obtained and compared with the analytical results from a potential flow model. This technique shows promise in making detailed flow measurements within high speed fans, compressors, turbines and nozzles, including the mapping of shock structures.
Gas Velocity Measurements Within a Compressor Rotor Passage Using the Laser Doppler Velocimeter
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Wisler, D. C., and Mossey, P. W. (April 1, 1973). "Gas Velocity Measurements Within a Compressor Rotor Passage Using the Laser Doppler Velocimeter." ASME. J. Eng. Power. April 1973; 95(2): 91–96. https://doi.org/10.1115/1.3445703
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