The reduction of spatial aliasing by long hot-wire anemometer probes |
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Authors: | J. H. Citriniti W. K. George |
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Affiliation: | (1) Department of Thermo and Fluid Dynamics, Chalmers University of Technology, S-412 96 Gothenburg, Sweden, SE;(2) Department of Mechanical and Aerospace Engineering State University of New York at Buffalo Buffalo, NY 14260, USA, US |
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Abstract: | Experiment and numerical analysis are presented to demonstrate that a hot-wire anemometer probe reduces spatial aliasing of turbulent velocity fluctuations because of the filtering property of the probe sensing element. The experiment focuses on the one-dimensional turbulent velocity spectrum and utilizes a long sensing length hot-wire probe to exaggerate the effect of the sensing element on the turbulent field. The numerical analysis utilizes a model of the hot-wire probe from Wyngaard (1968) along with isotropic turbulence relations to obtain an equation for the hot-wire response in a turbulent velocity field. The model can be used to determine the effect of hot-wire length on the one and three-dimensional turbulent spectra. The experimental study demonstrates that the finite length, hot-wire probe filters out energy in the high wave number region of the one-dimensional spectrum thereby verifying its ability to reduce spatial aliasing. Interestingly, the study also shows that energy in the low wave numbers of the one-dimensional spectrum is attenuated. The numerical study of the hot-wire probe demonstrates that this low wave-number attenuation is purely an artifact of the one-dimensional spectrum and not an effect of the hot-wire probe. Received: 20 May 996 / Accepted: 14 November 1996 |
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