高レイノルズ数スリットノズル固気混相噴流の流れに与える粒子の影響

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  • Effect of Particle Existences on High Reynolds Number Slit Nozzle Gas-Particle Two-Phase Jet.
  • コウレイノルズスウ スリットノズルコキコンソウ フンリュウ ノ ナガレ ニ アタエル リュウシ ノ エイキョウ

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Three-dimensional Eulerian air velocities and Lagrangian particle trajectories are numrically simulated to describe the effect of particle existences on a high Re number(Re=104)gas-particle turbulent jet using a two-way coupling and Large Eddy Simulation in which the effects of particle existences on subgrid-scale flows have been taken into account. The calculated rasults of air and particle turbulent characteristics(mean velocity distributions and turbulent intensity distributions)are in good agreement with experimental data obtained using a laser Doppler anemometer. Comparison of the instantaneous air vorticity iso-contours of gas-particle and clean air jets shows the production of vortices and eddies in the initial and the transitional regions and the reduction of air turbulence in the developed region by the presence of particles. Based on the model for the effects of particle existences on subgrid-scale flows, the flow states which reduce or enhance the air turbulence in high Re number gas-particle flows have been discussed.

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