Analysis of the Bugatti data for turbulent parameters |
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| Institution: | 1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China;3. School of Science and Engineering, University of the Sunshine Coast, Maroochydore DC, QLD 4558, Australia;4. Centre for Advanced Materials Processing and Manufacturing, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Queensland, 4072, Australia;5. Northwest Institute for Nonferrous Metal Research, Xi''an 710016, China |
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| Abstract: | The high frequency measurements of N2 and Ar concentrations by rocket borne mass spectrometers in the region 95 to ∼ 120 km are analysed for turbulence coefficients. The data, measured every 2m, are averaged over 20 m, and spectrally analysed. The spectra in the lower altitude region (Z < 108 km) are representative of lower atmospheric turbulence wherein the spectrum displays the “inertial” behavior. Thus we may determine turbulent parameters such as: viscous dissipation (ϵ), Reynolds stress (<u‘w’>), density flux (<w‘n’), diffusivity (Kϱ), the flux Richardson number, mean wind shear and an estimate of local temperature.Also determined at the upper region (108<z<120 km) is a non-“turbulent” noise-like fluctuation that diffusively transfers mass, but demonstrates random statistics. Density, spectral distributions, analytic processes and statistical characteristics of the two atmospheric mechanisms will be given. |
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