An anemometry technique for turbulence measurements at low velocities |
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Authors: | T Tsuji Y Nagano |
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Institution: | (1) Dept. of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, 466 Nagoya, Japan |
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Abstract: | A method using symmetrically bent V-shaped hot-wires has been developed for the accurate measurement of low-speed turbulence. Directional characteristics of V-shaped hot-wires at low velocities are investigated, and a generalized expression is derived for the effective cooling velocity. The measurement with V-shaped hot-wires in a pseudo turbulent field, which is artificially produced by shaking the hot-wires with an accurately known motion in a steady flow, has confirmed that the expression for the effective cooling velocity is also valid for instantaneous velocity fluctuations. The accuracy of a practical technique comprising two V-shaped hot-wires in an X arrangement is investigated by an error analysis in simulated Gaussian velocity fields using a digital computer. |
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