Heat Transfer, Fouling, and Combustion of Supercritical Fuels
Final rept. 15 Aug 1992-31 Mar 1994
IOWA UNIV IOWA CITY DEPT OF MECHANICALENGINEERING
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The specific objectives of the project were to investigate the dynamics of the vortex and flame interaction in jet diffusion flames and the transport phenomena associated with the injection of supercritical fluids into a sub-critical environment. The vortex-flame interaction in a near-laminar jet diffusion flame was quantified by a planar visualization and the vortex formation in a transitional jet diffusion flame by a line visualization. The measured vortex crossing frequency in transitional jet diffusion flames was used to verify the time-dependent diffusion flame calculations. The experiments also quantified the spray length in two different ambient environments composed of dissimilar species. The mixture pseudo-critical states were calculated for the conditions examined. The spray length, the calculated mixture pseudo-critical states, along with images of instantaneous light scattering and shadowgraph showed that the mixing of dense fluids dictated the spread of mist-like droplets and vapor-phase injector fluid. The supercritical sprays also exhibited flashing-like atomization as concluded from the experiments. Further investigation on the mixing in the super-critical sprays was suggested. Combustion, Jet diffusion flames, Sprays, Supercritical sprays.
- Combustion and Ignition