Hot-Film Velocity Measurement Uncertainty for DARPA SUBOFF Experiments

The uncertainty associated with measuring the three-component velocity for the DARPA suboff experiments has been investigated. Bias uncertainty due to temperature variation, probe alignment, analog to digital conversion, speed calibration and angle calibration resulted in an overall 2 sigma bias unc...

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Bibliographic Details
Main Authors: Blanton, Jame N, Forlini, Thomas J, Purtell, L P
Format: Report
Language:English
Subjects:
ALIGNMENT
ANALOG TO DIGITAL CONVERTERS
ANGLES
CALIBRATION
COMPUTATIONAL FLUID DYNAMICS
DARPA SUBOFF PROJECT
FLOWMETERS
Fluid Mechanics
HOT FILM ANEMOMETERS
INTENSITY
LEVEL(QUANTITY)
LOW LEVEL
MEASUREMENT
PE63569N
PROBES
TEMPERATURE
Test Facilities, Equipment and Methods
TURBULENCE
TURBULENT FLOW
VARIATIONS
VELOCITY
WU11542123
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Summary:The uncertainty associated with measuring the three-component velocity for the DARPA suboff experiments has been investigated. Bias uncertainty due to temperature variation, probe alignment, analog to digital conversion, speed calibration and angle calibration resulted in an overall 2 sigma bias uncertainty of + or - 2.21% for u/U sub ref and + or - 2.28% for v/W sub ref 1.79% for w/U sub ref. Precision (random) 2 sigma uncertainty depended slightly on turbulence intensity levels. For low turbulence intensity levels (TI approx 0.5%), precision uncertainty was + or - 0.04% for u/U ref, + or - 0.04% for v/U sub ref, and + or - 0.06% for w/U sub ref. For high turbulence intensity levels (TI approx 4%), precision uncertainty was + or - 0.28% for u/U sub ref, + or - 0.16% for v/U sub ref, and + or - 0.20% for w/U sub ref.