A new method for probing the turbulence scalar spectrum by ultrasonic sonar scanning |
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Authors: | C Shen U Lemmin |
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Institution: | (1) Laboratoire de recherches hydrauliques Ecole Polytechnique Fédérale de Lausanne CH-1015 Lausanne, Switzerland, CH |
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Abstract: | A new method is proposed to obtain a turbulent scalar spectrum and the energy dissipation rate in turbulent flow from ultrasonic
frequency scanning data. A scanning sonar with frequency varying from 0.5 MHz to 5 MHz has been used to directly probe the
energy dissipation rate ɛ and the three-dimensional scalar spectrum E
θ(k). Experiments were conducted in a laboratory open-channel flow in clear water with Reynolds numbers varying from 1.2×105 to 6.9×105. Good agreement is found between measured spectra and those predicted by the Batchelor theory. The energy dissipation rates
compare favourably with those obtained from acoustic Doppler velocimeter measurements.
Received: 20 March 1997/Accepted: 27 September 1997 |
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