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• W2187182892 abstract "NACA RN E52122NATIONAL ADVISORY COMMITTEE FOR AERONAUTICSRESEARCH MEMORANDUM VARIATION IN SMOKING TENDENCY AMONG LOW MOLECULAR / WEIGHT HYDROCARBONS By Rose L. Schalla and Glen E. McDonaldSUMMARY An investigation was made of the variations in smoking tendency among 38 gaseous and liquid pure hydrocarbon compounds when burned as diffusion flames in still air. The maximum rates at which the fuels could be burned smoke-free varied as follows: n-paraffins > iso-paraff ins > monoolefins >alkynes >aromatics. Cyclic paraffins and olefins as well as diolef ins were also studied. Their position over-lapped the trends of several of the series presented. Variations in smoking tendencies within the given homologous series were rather complex, but a tentative explanation is that the greater the strength of the carbon bonds or skeleton of the hydrocarbon molecule, the greater will be its tendency to form smoke during combustion. From this suggested explanation a possible mechanism based on dehydrogenation and subsequent polymerization of the carbon nuclei was proposed as the initial step involved in the formation of. smoke. INTRODUCTION In recent years considerable effort has been made to determine the factors and mechanisms which govern the formation of smoke during the burning of fuels, so that, eventually, methods of controlling smoke for-mation can be devised (references 1 to 3). Particular emphasis has been placed on the problem of preventing smoke formation during the burning of fuels in combustion chambers. Since the type of hydrocarbon present in a fuel is known to affect smoke formation (references 4 and 5), an investigation was conducted as part of the fundamental combustion pro-gram at the NACA Lewis laboratory to determine the maximum rate at which various pure hydrocarbons could be burned without producing smoke. From this investigation, it was hoped that the effects on smoking of such variables as chain length, chain branching, degree of unsaturation, posi-tion of unsaturation, and ring size could be evaluated and an explanation found to account for the variations." @default.
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• W2187182892 date "1952-01-01" @default.
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• W2187182892 title "NACA RESEARCH MEMORANDUM" @default.
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