Accession Number : AD0870184

Title :   Hydrogen Fluoride Tracer Molecule Spectroscopy Applied to Turbulent Mixing and Combustion.

Descriptive Note : Technical rept. 15 Nov 68-15 Nov 69,

Corporate Author : MICHIGAN UNIV ANN ARBOR DEPT OF AEROSPACE ENGINEERING

Personal Author(s) : Malte, Philip C. ; Nicholls, James A.

Report Date : MAY 1970

Pagination or Media Count : 95

Abstract : Turbulent mixing between coaxial streams of dissimilar gases is experimentally studied. The inner stream is tagged with a tracer molecule, hydrogen fluoride. Species concentrations and turbulent mixing extents are determined spectroscopically. Details of the technique for radiatively absorbing cold jets are given. Experiments with cold jets at subsonic and transonic Mach numbers show that the mixing layer width increases with nondimensional mass flux difference, and decreases with increasing Mach number level. Supersonic mixing and combustion of hydrogen and air is obtained using a three phase AC arc heater to heat the air. Schlieren photographs show a substantial increase in the rate of jet spread when combustion occurs. Preliminary determinations of temperature and concentration profiles, using the HF tracer, are presented. (Author)

Descriptors :   (*SUPERSONIC COMBUSTION, JET FLAMES), TURBULENCE, SCHLIEREN PHOTOGRAPHY, INFRARED SPECTRA, COMPRESSIVE PROPERTIES, TRACER STUDIES, FLUORIDES, HYDROGEN.

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE