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ISSN Печать: 2150-766X
ISSN Онлайн: 2150-7678
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PREDICTION OF HYBRID FUEL REGRESSION RATE IN CONFINED TURBULENT BOUNDARY LAYER COMBUSTION
Краткое описание
An efficient parabolized numerical procedure is developed for calculating a highly confined, chemically reacting turbulent flow. The conservation equations of mass, momentum, energy, and species concentration, together with the strong coupling of heat and mass transfers at the solid burning surface are numerically solved using a finite volume method. The standard k−ε turbulence model is used, and turbulence closure is achieved using a two-layer model that takes into account the wall-injection effect arising from the burning surface. Interaction between turbulence and combustion is modeled by Eddy-Dissipation Concept with fast chemistry. A two-dimensional adaptation of the Discrete Ordinates Method is used for estimating the flame radiation energy to the burning wall. The influence of various parameters (crossflow mass flux, radiation, oxygen concentration and confinement) on the regression rate, the flow velocity and the temperature was investigated. The predicted regression rate is in relatively good agreement with the available experimental data, and is a function of the crossflow mass flux raised to the nth power with n=0.681 for the confined flow.