Accession Number:

AD0669582

Title:

STUDIES OF NITRIC OXIDE CHEMILUMINESCENCE USING BOUNDARY LAYER APPROXIMATIONS.

Descriptive Note:

Final rept. Feb-Dec 67,

Corporate Author:

MITHRAS INC CAMBRIDGE MASS

Report Date:

1968-04-01

Pagination or Media Count:

80.0

Abstract:

The interface layer generated when a sonic jet is directed against a supersonic stream was analyzed by means of the boundary-layer equations for stagnation point flow. The gas from the jet is assumed to react chemically with the free-stream gas in a second order reaction. The parameters defining a particular solution are the normalized jet gas blowing rate and a Damkohler number relating the reaction rate to the velocity gradient along the interface layer. Numerical solutions were obtained covering a range of values of both parameters. The results presented emphasize the variation in concentration profiles through the layer as the Damkohler number is changed. They show that as the Damkohler number increases the total reaction between the two streams changes from a rate-controlled to a diffusion-controlled regime. The results were applied to the chemiluminescent reaction NO O yields NO2 photon and compared with measurements obtained in a low-density supersonic wind tunnel. The measurements clearly illustrate the transition between the two regimes and yield the bimolecular rate constant k 1.6 x 10 to the -12th power ccmole sec. Author

Subject Categories:

  • Aerodynamics
  • Atmospheric Physics
  • Physical Chemistry
  • Radiation and Nuclear Chemistry
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE