The Preston tube in adiabatic compressible flow |
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Authors: | P J Finley L Gaudet |
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Institution: | (1) Department of Aeronautics, Imperial College of Science, Technology and Medicine, SW7 2BY London, England;(2) Department of Civil Engineering, University of Surrey, GU2 5XH Guildford, Surrey, England |
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Abstract: | A new procedure for the reduction of Preston tube data is introduced, based on the van Driest transformation. It appears to give results agreeing with the better calibration experiments, although a significant assumption in its derivation is violated.List of Symbols
M
s
Mach number sensed by Preston tube
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M
Friction Mach number (=u /wall sound speed)
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R
Gas constant
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T
w
Wall temperature
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d
Diameter of Preston tube
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h
Height of effective centre of Preston tube
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p
Preston tube pressure difference reading
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p
i
Equivalent incompressible Preston tube reading
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p
w
Wall pressure
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r
Recovery factor (=0.896)
- u
Friction velocity (= w/wall density]1/2)
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Empirical constant allowing for departure from Crocco temperature-velocity correlation (=0.975)
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Specific heat ratio
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Fluid kinematic viscosity
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w
Wall shear-stress |
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Keywords: | |
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