Gas Velocity Measurements Within a Compressor Rotor Passage Using the Laser Doppler Velocimeter

[+] Author and Article Information
D. C. Wisler, P. W. Mossey

Aircraft Engine Group, General Electric Company, Cincinnati, Ohio

J. Eng. Power 95(2), 91-96 (Apr 01, 1973) (6 pages) doi:10.1115/1.3445703 History: Received July 27, 1972; Online July 14, 2010


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.

Copyright © 1973 by ASME
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