The n-heptane jet with subcritical and supercritical inlet temperatures injected into a supercritical environment filled with multi-component gas, has been numerically investigated using large eddy simulation. Mainly attentions are paid on the effects of density-gradient, thermodynamic and transport properties on the flow evolution. We find that large density-gradients are easier formed in transcritical injection and the larger specific heat has the effects of increasing the density gradients. While the diffusion coefficient decrease in the larger density gradient regions, suggesting that large density gradient has the effects of suppressing the flow diffusion mixing. In addition, when the fluid transits across the pseudo boiling temperature, the specific heat obtained a maximum value, while this value is suppressed by the dissolution effects, indicating that multi-component injection is different from the single species injection and a special investigation is needed.
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