Soot formation in hydrogen-, allene-, and vinylacetylene-acetylene and acetylene-, allene-, vinylacetylene-, and 1,3-butadienebenzene argon-diluted mixtures was studied behind reflected shock waves by monitoring the attenuation of a 632.8-nm He-Ne laser beam. The experiments were performed at temperatures of 1500-2490 K, pressures of 1.3-3.1 bar, and total carbon atom concentrations of (2.0-6.8) X 1017 atoms/cm3. The addition of molecular hydrogen to acetylene resulted in the decrease of soot production. Synergistic effects on soot formation were observed in the binary hydrocarbon mixtures. The experimental observations were interpreted by using detailed chemical kinetic modeling. The reaction mechanism used in the simulations was composed of 522 reversible reactions and 180 species. The computational results revealed that the mixture effects are caused primarily by the acceleration of acetylene-addition reactions.

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A program was conducted to investigate the feasibility of using the combustion noise acoustic output as a non-intrusive diagnostic of some details of the combustion process. Investigated were an open premixed turbulent jet flame and a gas turbine combustor converted to run on propane. The analysis links the acoustic pressure fluctuations to the distribution of heat release rate fluctuations. Measurement of the sound field in principle yields the heat release rate fluctuation field. It was found, DD FORMA 73 Li 1 JAN 73 14 EDITION OF 1 NOV 65 IS OBSOLETE Unclassifed SECURITY CLASSIFICATION OF THIS PAGE (When Data Entered) SECURITY CLASSIFICATION OF THIS PAGE(Whon Dais &listed)however, that the analytical methods for this inverse problem are too sensitive to small experimental uncertainties. Consequently, it appears that the method is not feasible, in general.SECURITY CLASSIFICATION OF Yu.'" PAGE(IThen Data Entered)

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