Abstract
This study investigated the low swirl turbulent flow characteristics combined with the hybrid fractal grid, and studied the correlation between the turbulence intensity of the combustion reaction field and structural variables of the grid. The turbulence intensity before the nozzle outlet showed the characteristics of the cross grid. Turbulence intensity increased in the descending order of reduced ratio of bar thickness(RRBT), and the maximum point was located in the down stream. The Borghi-Peter diagram confirmed that the flame region was location in the thin reaction zone, and the height at which the flame floats from the nozzle exit was determined with the number of grid iterations was quantified with an OHSUP*/SUP chemiluminescence image. The combustion reaction field was characterized by variable(χSUP*/SUP) containing structural information of the grid, and the correlation between the characterized flow and I²/(I²)SUBpeak/SUB was identified. The coefficient of determination(R²) differed with the number of iteration and shape of the grid, and at I3, it was the highest in χSUBs/SUBSUB/SUBSUP*/SUP including the square grid variable.
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