Accession Number : AD0831896

Title :   SUPERSONIC MIXING AND COMBUSTION.

Descriptive Note : Annual technical rept. no. 1, 15 Nov 66-15 Nov 67,

Corporate Author : MICHIGAN UNIV ANN ARBOR GAS DYNAMICS LABS

Personal Author(s) : LaPointe, Clayton W.

Report Date : MAR 1968

Pagination or Media Count : 97

Abstract : One of the least understood but yet most important aspects of Scramjet Scientific Technology is the rate of turbulent mixing and combustion of supersonic fuel and air streams. An appreciable portion of this uncertainty stems from the lack of knowledge of the pertinent turbulent transport coefficients. This research is directed at improving the fundamental understanding of these phenomena by the application of non-interference diagnostics to well controlled experiments involving supersonic mixing with and without combustion. The report represents the first year's effort on this study. Design details of an experimental facility to investigate supersonic turbulent mixing are presented. Infrared spectroscopy, direct species sampling, and shadow photography are to be employed to determine, initially the rate of free mixing of both coaxial and paraxial streams at Mach 3. The working fluids are air and hydrogen or a hydrocarbon with hydrogen fluoride as a tracer molecule. The absorption of the fundamental rotation-vibration band of hydrogen fluoride is related to HF concentration by Abel integral inversion. It is shown that the Ladenburg-Reiche spectral line strength theory is applicable to non-homogeneous absorp media. (Author)

Descriptors :   *JET MIXING FLOW), (*SUPERSONIC COMBUSTION RAMJET ENGINES, SUPERSONIC COMBUSTION), (*SUPERSONIC COMBUSTION, TURBULENCE, VORTICES, VISCOSITY, EXPERIMENTAL DESIGN, TRACER STUDIES, HYDROGEN COMPOUNDS, SAMPLING, FLUORIDES, INFRARED SPECTROSCOPY, EQUATIONS OF MOTION, SUPERSONIC CHARACTERISTICS, ABSORPTION SPECTRA, SPARK SHADOWGRAPH PHOTOGRAPHY.

Subject Categories : Fluid Mechanics
      Combustion and Ignition
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE