TURBULENT DIFFUSION OF A THREE-DIMENSIONAL WALL JET : 2ND REPORT, TURBULENT STRUCTURE

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概要

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• In order to examine the diffusion of a slightly heated jet on a plane wall, intermittency factors, crossing frequencies, conditional zone averages, power spectrum densities and probability densities of velocity and temperature as a passive scalar were evaluated by digital processing of instantaneous temperature and three velocity components. The intermittency factor distributions indicate that intermittent regions extend more in sparwise direction than in normal direction. This presumably results in a larger entrainment from sparwise edges and explains the cause of anisotropic growth of the three-dimensional wall jet observed in the 1st report. Turbulent zone averages of velocity and temperature are larger than those in non-trubulent zones. Probability densities of velocity and temperature have only one peak and their spectra have no spike in far field from the jet exit. Flow field is characterized by rather random and three dimensional turbulence. These results are confirmed by flow visualization of cross sections normal to jet axis.

• 一般社団法人日本機械学会の論文

著者

• Ohashi Hideo

  Faculty Of Agriculture Gifu University

• KOSO TORU

  Research Institute of Industrial Science, Kyushu University

• Koso Toru

  Research Institute Of Industrial Science Kyushu University

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