A linear model is developed to relate the response of energy release rate per unit volume to velocity and pressure oscillations in a liquid-propellant rocket engine. Coaxial injection of fuel (outer flow) and oxygen (inner flow) is considered with chemical reaction in a thin flame and turbulent mixing as the controlling factor in an axisymmetric diffusion flame. The combustion process has a characteristic time for mixing, producing a time lag in the energy release rate relative to pressure. The model applies to an individual injector but can be used to couple the multipoint combustion processes and wave dynamics for a multi-injector chamber. In particular, the impacts of long-wavelength oscillations of pressure and velocity in the surrounding chamber gas on the mixing and burning rates are determined. The results are developed in a way that feedback to the chamber oscillations can be determined for either a computational analysis or a perturbation analysis of the chamber wave dynamics. Both the steady-state behavior and the unsteady linear perturbation for the coaxial jet are studied using an axisymmetric Green’s function. Flame temperature, flame shape, and burning rates are found as a function of mixture ratio and injector size (mixing time). The combustion response factor for oscillatory behavior is also determined.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Coaxial Jet Flame Subject to Long-Wavelength Acoustic Oscillations


    Contributors:

    Published in:

    Publication date :

    2016-05-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Coaxial Jet Flame Subject to Long-Wavelength Acoustic Oscillations

    Sirignano, William A | Online Contents | 2016


    Coaxial Jet Flame Subject to Long-Wavelength Acoustic Oscillations

    Sirignano, William A | Online Contents | 2016


    Flame-Acoustic Interaction in GOX/GH2 Shear-Coaxial Injector Flow-field

    Ghosh, Amardip / Diao, Q / Yu, Kenneth | AIAA | 2006


    Effect of Density Ratio on Shear-Coaxial Injector Flame-Acoustic Interaction

    Ghosh, Amardip / Diao, Qina / Young, Greg et al. | AIAA | 2006


    Effect of Density Ratio on Shear-Coaxial Injector Flame-Acoustic Interaction

    Ghosh, A. / Diao, Q. / Young, G. et al. | British Library Conference Proceedings | 2006