Effect of 2,5-dimethylfuran addition on ignition delay times of n-heptane at high temperatures

Abstract

The shock tube autoignition of 2,5-dimethylfuran (DMF)/n-heptane blends (DMF0-100%, by mole fraction) with equivalence ratios of 0.5, 1.0, and 2.0 over the temperature range of 1200–1800 K and pressures of 2.0 atm and 10.0 atm were investigated. A detailed blend chemical kinetic model resulting from the merging of validated kinetic models for the components of the fuel blends was developed. The experimental observations indicate that the ignition delay times nonlinearly increase with an increase in the DMF addition level. Chemical kinetic analysis including radical pool analysis and flux analysis were conducted to explain the DMF addition effects. The kinetic analysis shows that at lower DMF blending levels, the two fuels have negligible impacts on the consumption pathways of each other. As the DMF addition increases to relatively higher levels, the consumption path of n-heptane is significantly changed due to the competition of small radicals, which primarily leads to the nonlinear increase in the ignition delay times of DMF/n-heptane blends.

Keywords

ignition delay time / shock tube / kinetic model / 2,5-dimethylfuran (DMF) / n-heptane

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (Grant Nos. 91641124, 51306144) and the Project of Youth Star in Science and Technology of Shaanxi Province (2018KJXX-031). The supports from the Fundamental Research Funds for the Central Universities and the State Key Laboratory of Engines at Tianjin University (K2018-10) are also appreciated.

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