Accession Number : AD0270617

Title :   A SHOCK TUBE STUDY OF THE KINETICS OF NITRIC OXIDE AT HIGH TEMPERATURES

Corporate Author : AVCO EVERETT RESEARCH LAB EVERETT MASS

Personal Author(s) : WRAY,KURT L. ; TEARE,J. DEREK

Report Date : JUN 1961

Pagination or Media Count : 1

Abstract : A shock tube program was carried out in which the NO concentration was followed as a function of time behind the shock front by absorption of 1270A radiation, where ground vibrational state O2 and N2 are essentially transparent. The absorption coefficients of the species NO, O2 and N2 as functions of the respective vibrational temperatures were determined by measuring theABSORPTION BY THE SHOCK-HEATED GAS AT A POINT IN THE TIME HISTORY CORRESPONDING TO COMPLETE VIBRATIONAL RELAXATION BUT BEFORE THE ONSET OF DISSOCIATION. Time history analyses were made on a total of 42 shock tube runs covering a temperature range of 3000-8000 K on the following six mixtures: 1/2% NO, 1/2% NO + 1/4% O2, 10% NO, 50% NO, 20% air and 100% air. The diluent in all cases was argon. An IBM 704 computer was programmed to integrate the vibrational and chemical rate equations as a function of time behind the shock front, subject to the constraints of the conservation equations. The pertinent rate constants were varied in a systematic trial and error manner in order to get the best fit to all the data. (Author)

Descriptors :   *REACTION KINETICS, *RAREFIED GAS DYNAMICS, HIGH TEMPERATURE, NITROGEN COMPOUNDS, OXIDES, RECOMBINATION REACTIONS, SHOCK TUBES, SHOCK WAVES

Distribution Statement : APPROVED FOR PUBLIC RELEASE