レーザー・ドップラー流速計による室内乱流統計量の測定

概要

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The turbulent recirculating flows in a room model are measured in detail, where not only mean velocity vector components but also the turbulent energy κ, the Reynolds stress <u_iu_j>^^^-, the eddy viscosity ν_t, and the turbulent energy dissipation rate ε, are precisely measured with a 2-colors 3-beams backscattering type Laser Doppler Velocimeter (LDV). The eddy viscosity ν_t are calculated from the Reynolds stress and mean shear distribution through its original definition of eddy viscosity modelling. The turbulent energy dissipation rate are estimated through the relation of ν_t, κ, and ε;ν_t=C_μ・κ^2/ε. Here, C_μ is estimated as at 0.09. These detailed analyses of turbulent air flow in rooms make it possible to verify the validity of numerical simulations by comparing these results with results of simulations. As present only a LDV system makes it possible to measure such fine structures of complicated 3-D turbulent recirculating flow in rooms.
社団法人日本建築学会の論文
1990-07-30