Authors: Reid A Berdanier Nicole L Key
Publish Date: 2016/02/17
Volume: 57, Issue: 3, Pages: 29-
Abstract
The single slanted hotwire technique has been used extensively as a method for measuring three velocity components in turbomachinery applications The crossflow orientation of probes with respect to the mean flow in rotating machinery results in detrimental prong interference effects when using multiwire probes As a result the single slanted hotwire technique is often preferred Typical data reduction techniques solve a set of nonlinear equations determined by curve fits to calibration data A new method is proposed which utilizes a lookup table method applied to a simulated triplewire sensor with application to turbomachinery environments having subsonic incompressible flows Specific discussion regarding corrections for temperature and density changes present in a multistage compressor application is included and additional consideration is given to the experimental error which accompanies each data reduction process Hotwire data collected from a threestage research compressor with two rotor tip clearances are used to compare the lookup table technique with the traditional nonlinear equation method The lookup table approach yields velocity errors of less than 5 for test conditions deviating by more than 20 °C from calibration conditions on par with the nonlinear solver method while requiring less than 10 of the computational processing time
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