Abstract
Methods employed and experience gained in measuring random fluid-boundary-layer pressures on the surface of a small-diameter cylindrical rod subject to dense, nonhomogeneous, turbulent, parallel flow in a relatively noise-contaminated flow loop are described. Emphasis is placed on identification of instrumentation problems; description of transducer construction and mounting; and the pretest calibration required to achieve instrumentation capable of reliable data acquisition.
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Abbreviations
- a 1 :
-
rod amplitude at fundamental frequencyf 1
- d :
-
rod diameter
- d t :
-
transducer diameter
- D :
-
outside diameter of annular region
- D h :
-
hydraulic diameter
- f 1 :
-
fundamental rod frequency
- k * :
-
wave numberf/V
- P s :
-
stagnation pressure
- T :
-
turbulent eddy-time period
- V :
-
mean flow velocity
- \(\varrho _f \) :
-
fluid-mass density
- \(\Phi _p \) :
-
spectral density
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Mulcahy, T.M., Lawrence, W. & Wambsganss, M.W. Dynamic surface-pressure instrumentation for rods in parallel flow. Experimental Mechanics 22, 31–36 (1982). https://doi.org/10.1007/BF02325701
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DOI: https://doi.org/10.1007/BF02325701