Simultaneous observation of organized density structures and the visible field in pool fires.
Organized d. structures and the visible field of pool fires were obsd. simultaneously with a real-time holog. interferometric method. The organized structures depend on the height above the pool rim, the pool diam., the fuel supply rate, the equivalence ratio, and the fuel type. These structures show mono-, quasi-, and nonperiodic behavior. A d. structure forming concentric ring-shaped interference fringes is defined as a d. parcel. With a simplified momentum equation the axial convection velocity of fire parcels, which is up to 3 times faster than that of the d. parcels, was calcd. Instantaneous mass densities and temps. were calcd. by the Abel inversion, including the concn. profiles of 15 stable fire gas species. From the frequency distributions of the geometric dimensions of d. parcels, macro-, and microscales that agree with the scales obtained from power spectra were detd.
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