Research in Marine Boundary Layer Intermittency
PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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Wind-tunnel calibrations of turbulent-pressure sensors usually reveal deviations from ideal response. These deviations are typically reported in dimensional form e.g., in microbars or as a fraction of the dynamic pressure. Neither presentation gives a direct indication of the reliability of pressure statistics measured in a turbulent flow. We derive a general response equation for a turbulent-pressure probe. The coefficients in the equation are equation are obtainable from standard wind-tunnel calibration results. The form of the response equation makes it straightforward to relate the errors in measured pressure statistics of the turbulence. We demonstrate this by evaluating the reliability of measurements of some important pressure covariances, including the pressure-transport term in the turbulent kinetic energy TKE budget in the unstable surface layer. The preliminary finding is that the Nishiyama-Bedard sensor is capable of measuring pressure transport of TKE there to within 10-20.
- Fluid Mechanics