Accession Number : ADA137079

Title :   Ionic Mechanisms of Carbon Formation in Flames.

Descriptive Note : Annual rept. 1 Apr 81-31 Mar 82,


Personal Author(s) : Calcote,H F ; Olson,D B

PDF Url : ADA137079

Report Date : Jan 1983

Pagination or Media Count : 58

Abstract : The chemi-ion ion-molecule mechanism of soot formation has gained further support by detailed studies of ion profiles through sooting flames. Langmuir probes have been used to obtain absolute ion concentrations in premixed acetylene-oxygen flames over a range of equivalence ratios extending from nonsooting to sooting flames. These data have been used in a preliminary calibration of the mass spectrometer. The effect of initial temperature on the tendency of several flames to soot has been measured. For a given premixed flame the tendency to soot decreases with increasing temperature but for a series of fuels with increasing tendency to soot, the temperature at which soot occurs increases with the tendency to soot. Ion concentrations will be measured in this set of flames. Calculations of particle electronics and coagulation rates have been initiated to determine whether the large molecular ions observed in sooting flames are the cause or effect of soot formation and in preparation for quantitative modeling of soot formation. (Author)

Descriptors :   *Carbon, *Soot, *Flames, *Ions, Molecules, Molecular ions, Interactions, Combustion, Coagulation, Rates, Nucleation, Concentration(Chemistry), Acetylene, Oxygen, Langmuir probes, Mass spectrometers, Calibration, Temperature, Mixing, Particles, Molecular structure, Hydrocarbons, Fuels

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE