The autoignition of turbulent non-homogeneous hydrogen-air mixtures is studied using the Linear-Eddy Model (LEM). The initial solution consists of fully segregated regions of fuel and oxidizer mixtures. The relative size of the these regions represents a measure of the initial dissipation rates, while the specified turbulence conditions determine the subsequent evolution of the dissipation rate field. Chemistry and transport are described accurately using a detailed mechanism for hydrogen-air chemistry and the Chemkin libraries. The simulations are implemented for a range of pressures and initial mixing conditions to identify the effects of mixing on the dominant autoignition chemistry. The simulations show that some of the salient features of the coupling between autoignition chemistry and mixing may adequately be captured by the LEM model.
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