Accession Number : AD0675529

Title :   NO2 CHEMILUMINESCENT WAKE RADIATION.

Descriptive Note : Research rept.,

Corporate Author : AVCO EVERETT RESEARCH LAB EVERETT MASS

Personal Author(s) : Schapker,R. L. ; Camac,M.

Report Date : JUN 1968

Pagination or Media Count : 46

Abstract : A flow field and chemical kinetics model is presented for calculating the NO + O to NO2 + photon chemiluminescence wake emission. Numerical results are compared to the wake measurements made by Reis in a ballistic range. The wake NO2 chemiluminescence intensity tends to peak at several hundred body diameters, decreasing in intensity in the far wake. The far-wake structure of these profiles is fit well by our calculations. Peaking of the intensity is due mainly to the drop in the mean wake temperature; final decay is shown to be caused both by atomic O cleanup and by dilution in the growing turbulent wake. For pure air the cleanup reactions are due to NO + O + N2 to NO2 + N2 and O2 + O + N2 to O3 + N2. However, for the ballistic range conditions with approximately 0.01% H2O contamination, the O cleanup was dominated by a reaction chain involving atomic hydrogen. (Author)

Descriptors :   (*NITROGEN OXIDES, *CHEMILUMINESCENCE), (*WAKE, CHEMILUMINESCENCE), ATMOSPHERE ENTRY, REACTION KINETICS, FLOW FIELDS, EMISSIVITY, OXYGEN, WATER VAPOR, REENTRY VEHICLES

Subject Categories : Atmospheric Physics
      Physical Chemistry
      Electric and Ion Propulsion

Distribution Statement : APPROVED FOR PUBLIC RELEASE