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- W2039551798 abstract "Large-eddy simulations (LES) were used to investigate turbulent buoyant jet diffusion flames. The numerical method was based on a projection approach for low Mach number compressible flows. The infinitely fast chemistry of the “mixed-is-burned” type was employed. The dynamic phenomena of flame flickering associated with the formation and evolution of large vortex structures in the near field were well captured. The buoyancy-modified Kelvin-Helmholtz instability mechanism was responsible for the initial roll-up of the vortices, followed by the breakdown of continuous flames. The transition from intermittent to plumelike behavior occurred further downstream. The decay of the centerline mean velocity was proportional to x−1/3 in the plumelike region, where x is the streamwise location, in agreement with experimental observation. The energy spectrum for the mixture fraction field showed both −5/3 and −3 power laws, characteristic of buoyancy-dominated flows. A global quantitative description of the flow field is given in terms of the mean, root mean square (rms), and probability density function (pdf) profiles of the axial velocity, temperature, and mixture fraction. The fluctuation levels of velocity and scalar variables were within the experimentally determined range, whereas a wide range of shapes were exhibited in the pdfs of the mixture fraction." @default.
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- W2039551798 date "2000-01-01" @default.
- W2039551798 modified "2023-09-22" @default.
- W2039551798 title "Dynamic behavior in reacting plumes" @default.
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- W2039551798 doi "https://doi.org/10.1016/s0082-0784(00)80709-2" @default.
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