The aerofoil probe method of measuring turbulence has been successfully adapted for use in liquids. The new instrument offers considerable advantage over its main competitor/ the hot film anenometer. The key feature of the probe is a very small lift force sensor which responds to angle of attack fluctuations in the oncoming flow. A piezoelectric transducer generates an output voltage which varies linearly with the lift force and hence with the v or w component of turbulence velocity. In its present configuration the probe comprises an axisymmetric lift sensor of 0.095 in. diameter coupled directly to a miniature preamplifier unit (0.25 in. diameter). Turbulence measurements in the wakes of cylinder models mounted in a water tunnel indicate uniform frequency response over a nominal range of 1 Hz to 500 Hz, with signal/noise ratios as large as 1000 to 1. Application considerations and methods of calibration are discussed.

Media Info

  • Features: References;
  • Pagination: p. 435-439

Subject/Index Terms

Filing Info

  • Accession Number: 00128732
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Jan 14 1976 12:00AM