Accession Number : AD0714072

Title :   Shock Tube Studies of Nitrogen Vibrational Relaxation and Methane Oxidation.

Descriptive Note : Final rept.,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY N Y RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : White,Donald R.

Report Date : JUN 1970

Pagination or Media Count : 62

Abstract : The report summarizes the research performed under this contract in the general areas of vibrational relaxation and shock tube chemistry. The authors have unsuccessfully attempted to generate cylindrical detonations in H2-O2 under conditions such that the reaction zone and shock front could be observed first to separate and hopefully then to reattach. The induction time for methane has been measured over a wide range of pressure, temperature, stoichiometry, and diluent using both incident and reflected shock waves. An activation energy of about 51 kcal/mole is found, larger than that of several other investigators largely due to our observation of longer times at the lower temperatures. In the H2/CO/O2 system the combination of flame and interferometric shock data has earlier proved valuable in selection from among alternative kinetic schemes, but laminar reaction zones have been unattainable in methane oxidation without use of an additive to speed the reaction. Qualitatively, acetone, methyl alcohol, and acetylene all accelerate the reaction to a decreasing extent. Hydrogen has been used as an additive to obtain density profiles adequate for comparison with computed profiles using a complex reaction scheme. A first attempt at computer reconciliation of flame and shock tube data has been made with encouraging results, and changes to be incorporated in the next iteration of the kinetic system have been identified. (Author)

Descriptors :   (*METHANE, *OXIDATION), (*SHOCK TUBES, METHANE), DETONATIONS, REACTION KINETICS, OXYGEN, VIBRATION, MOLECULAR ENERGY LEVELS, RELAXATION TIME, HYDROGEN

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE