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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN En Línea: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v3.i1-6.130
pages 115-131

CARS TEMPERATURE AND SPECIES MEASUREMENTS IN PROPELLANT FLAMES

John H. Stufflebeam
United Technolgies Research Center, East Hartford, CT 06108
Alan C. Eckbreth
United Technolgies Research Center, East Hartford, CT 06108

SINOPSIS

Measurements of species, temperature, and their gradients are necessary for accurate modeling of solid propellant reaction mechanisms and their effect on the combustion characteristics of the propellant. The very difficult experimental problems posed by solid propellant combustion environments challenge even the most modern diagnostic techniques. CARS (coherent anti-Stokes Raman scattering) and DFWM (degenerate four-wave mixing) are coherent nonlinear, laser-based, optical diagnostics with high spatial and temporal resolution that accommodate well to the high interference and restricted optical access environments typical of solid propellant combustion experiments. CARS measurements at our laboratory have confirmed the equilibrium chemistry (temperature and species concentration) of nitramine propellant formulations burning at elevated pressures. A 1-D imaging configuration, realized with cylindrical optics and a 2-D detector, provides enhanced spatial resolution and single-shot data on species and temperature gradients adjacent to the strand surface during high pressure combustion. An experimental program, currently underway to obtain CARS and DFWM measurements near the surface of combusting energetic materials at atmospheric pressure using a motorized strand burner, will also be described.


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