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Theuncertaintiaerseabesetstimatbeaseodnprecisionb,ias, eluding station 135). Because window curvature and blade andmeasuremrenpteatabilitTy.heprecisioonfthemeasure- span both decrease in the rear of the impeller, the uncertainty menitnstrumenists,ofcourseb,ettetrhantableXIVindicates. in the pitch angle for measurement stations 165 to 178 should Nonrepeatibiliitsythegreatesctontributotrotheestimated be less than +_2° over the entire blade span (except in regions of uncertaintieTsh.ust,herelativuencertaintiaersemuchsmaller high unsteadiness, such as the throughflow wake). in themeasuremecnotsmprisinigndividuaslpanwisperofiles, whichwereacquireadtaparticulaorperatincgonditiownith- outinterruptioonftesting. However, the absolute level of the profile is less certain. Laser anemometer measurements.--The uncertainty of the individual velocity component measurements was estimated from the least-squares calculation to be, on the average, approximately +1.5 m/see throughout most of the impeller pas- sage. Through much of the impeller passage, the throughflow velocity magnitude was on the order of 75 m/see. Thus, the uncertainty of the measured velocity components is generally less than 2 percent of the throughflow component (except in regions of high unsteadiness, such as the throughflow wake). The measured velocity components are subject to the uncer- tainties arising from window curvature, which distorts the laser anemometer probe volume. The uncertainties of the measured velocity components, in turn, propagate into the calculated velocity components. The spanwise velocity component and flow pitch angle are very susceptible to uncertainty propaga- tion and most sensitive to window curvature. The uncertainty in pitch angle, which directly indicates the ability to resolve the spanwise velocity component, is estimated from figure 13 to be less than +_20for measurement locations in the outer 70 percent of blade span (i.e., for all measurement stations up to and in- Summary of Results A laser anemometer system was used to provide detailed surveys of the three-dimensional velocity field within a 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. Flow path coordinates, detailed blade geometry, and pneu- matic 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 incre- ments, 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. Lewis Research Center National Aeronautics and Space Administration Cleveland, Ohio, February 22, 1995 11PDF Image | Laser anemometer measurements of the three-dimensional rotor flow
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