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The three mean velocity components were measured in a full-scale annular turbine stator cascade with contoured hub end wall using a newly developed laser anemometer system. The anemometer consists of a standard fringe configuration using fluorescent seed particles to measure the axial and tangential components. The radial component is measured with a scanning confocal Fabry-Perot interferometer. These two configurations are combined in a single optical system that can operate simultaneously in a backscatter mode through a single optical access port. Experimental measurements were obtained both within and downstream of the stator vane row and compared with calculations from a three-dimensional inviscid computer program. In addition, detailed calibration procedures are described that were used, prior to the experiment, to accurately determine the laser beam probe volume location relative to the cascade hardware. Goldman, Louis J. and Seasholtz, Richard G. Glenn Research Center RTOP 505-62-21...
A laser anemometer system was used to provide detailed surveys of the three-dimensional velocity field within the NASA low-speed centrifugal impeller operating with a vaneless diffuser. Both laser anemometer and aerodynamic performance data were acquired at the design flow rate and at a lower flow rate. Floor path coordinates, detailed blade geometry, and pneumatic probe survey results are presented in tabular form. The laser anemometer data are presented in the form of pitchwise distributions of axial, radial, and relative tangential velocity on blade-to-blade stream surfaces at 5-percent-of-span increments, starting at 95-percent-of-span from the hub. The laser anemometer data are also presented as contour and wire-frame plots of throughflow velocity and vector plots of secondary velocities at all measurement stations through the impeller. Hathaway, Michael D. and Chriss, Randall M. and Strazisar, Anthony J. and Wood, Jerry R. Glenn Research Center NASA-TP-3527, E-9390, NAS 1.60:3527, ARL-TR-333 RTOP 505-62-52; DA PROJ. 1L1-61102-AH-45...
Experiments with a three-component laser anemometer on the wake and vortex structure behind a model wing at incidence in a 4ft x 3ft subsonic test section are described. Three colours from the output spectrum of an argon-ion laser were used for the three Doppler-difference arrangements. The complete optical system operated in backscatter and was mounted on a single table which could be translated in three orthogonal directions. An integrated data acquisition and reduction system was used incorporating a photon correlator and a Honeywell 6/36 minicomputer. The output data consisted of mean-velocity and turbulence-intensity values for all three components at each measurement point. From these data, the mean-velocity components in the directions of the conventional tunnel axes could be derived by means of a linear transformation. However, the measured turbulence intensities do not yield the turbulence intensities for these components without additional assumptions or supplementary information. (Author).