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A flamelet model for turbulent diffusion combustion in supersonic flow

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Abstract

In order to develop a turbulent diffusion combustion model for supersonic flow, the physical argument of the extension of the flamelet model to supersonic flow was presented, and the flow field of a hydrogen/air diffusion combustion generated by axisymmetric supersonic jets was numerically simulated by employing the flamelet model. Using the experimental data, value of the model coefficient of scalar dissipation in the flamelet model was revised specifically for supersonic flow. The computational results of the modified flamelet model were compared with the experimental results, and it was indicated that the precision of the modified flamelet model was satisfying. Based on the numerical results and flamelet theory, the influence mechanisms of turbulence fluctuation on the average state equation and chemical reaction rate were studied for the first time. It was found that the fluctuation correlation of species mass fractions and temperature has little effect on the averaged gas state equation; the temperature fluctuation decreases the product of H2O, but its effect is small; the fluctuation of species mass fractions increases the product of H2O in the region close to oxidizer while decreases the product of H2O in other regions; the fluctuation correlation of species mass fractions and temperature largely decreases the product of H2O.

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Authors and Affiliations

  1. School of Aeronautical Science and Engineering, Beihang University, Beijing, 100191, China

    ZhenXun Gao & ChunHian Lee

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  1. ZhenXun Gao
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  2. ChunHian Lee
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Correspondence to ZhenXun Gao.

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Gao, Z., Lee, C. A flamelet model for turbulent diffusion combustion in supersonic flow. Sci. China Technol. Sci. 53, 3379–3388 (2010). https://doi.org/10.1007/s11431-010-4169-z

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  • DOI: https://doi.org/10.1007/s11431-010-4169-z

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