Hot wire spatial resolution effects in measurements of grid generated turbulence

A. Ashok, M. Hultmark, A. J. Smits, S. C.C. Bailey

Research output: Contribution to conferencePaper

Abstract

We use grid generated homogeneous isotropic turbulence as a benchmark flow to test the effects of spatial resolution on turbulence measurements with hot wires. The grid turbulence is generated in a low speed 0.6 m by 0.9 m closed circuit wind tunnel using a square mesh grid placed at the test section inlet. Measurements of the turbulence statistics and spectra downstream of the grid were made using hot-wires of varying length. An empirical correlation for the attenuation of the energy due to spatial filtering is constructed as a function of the parameter l/ν. The effect of spatial filtering on the streamwise spectrum function is observed to extend to almost all wavenumbers, even those significantly lower than the length of the hot wire itself. It is shown that these grid turbulence results relate directly to the nearwall region of wall-bounded flows, where the effects of spatial filtering are most acutely felt.

Original languageEnglish (US)
StatePublished - Jan 1 2011
Event7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada
Duration: Jul 28 2011Jul 31 2011

Other

Other7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011
CountryCanada
CityOttawa
Period7/28/117/31/11

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

Fingerprint Dive into the research topics of 'Hot wire spatial resolution effects in measurements of grid generated turbulence'. Together they form a unique fingerprint.

  • Cite this

    Ashok, A., Hultmark, M., Smits, A. J., & Bailey, S. C. C. (2011). Hot wire spatial resolution effects in measurements of grid generated turbulence. Paper presented at 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011, Ottawa, Canada.