Accession Number:

AD0617732

Title:

TURBULENT MIXING OF AXISYMMETRIC JETS OF PARTIALLY DISSOCIATED NITROGEN WITH AMBIENT AIR.

Descriptive Note:

Final technical rept., for Feb 64-Jun 65,

Corporate Author:

AVCO CORP WILMINGTON MASS RESEARCH AND ADVANCED DEVELOPMENT DIV

Report Date:

1965-07-15

Pagination or Media Count:

115.0

Abstract:

Recent attempts to predict the heat transfer from a high enthalpy, compressible free jet impinging upon surfaces in its path have suffered from a complete lack of knowledge concerning the behavior of turbulent jets of dissociated gases. Although it had been assumed that high enthalpy gas streams would exhibit the characteristics of cold jets, which have been subjected to extensive study, there had been no experimental evidence to support this contention. A research program was conducted to determine radial and axial variations in fluid properties, i.e., velocity, density, enthalpy, etc., in compressible free jets of dissociated gases produced by electric-arc plasma generators. Experimental investigations were confined to the near flowfield of the jets, since 90 percent of change in jet fluid properties, from their initial values at the arc nozzle-exit plane to the properties of the ambient fluid, was accomplished within 40 nozzle radii from the jet origin. Heat-transfer rates from these jets, when impinging upon a flat surface perpendicular to the jet axis, were determined experimentally. Correlation of this data could then be accomplished by means of a relationship similar to those for stagnation-point heat transfer to blunt bodies in a uniform stream when local jet properties were employed. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE