Ignition Delay Characteristics and Kinetic Investigation of Dimethyl Ether/n‑Pentane Binary Mixtures: Interpreting the Effect of the Equivalence Ratio and Dimethyl Ether Blending

• Published in: Energy & fuels Vol. 32; no. 3; pp. 3814 - 3823
• Main Authors: Jiang, Xue, Deng, Fuquan, Yang, Feiyu, Huang, Zuohua
• Format: Journal Article
• Language: English
• Published: American Chemical Society 15.03.2018
• ISSN: 0887-0624; 1520-5029
• DOI: 10.1021/acs.energyfuels.7b02682

Measurements of the autoignition delays of dimethyl ether (DME)-enriched n-pentane mixtures were conducted at the equivalence ratios of 0.5–2.0, pressure of 20 atm, and temperatures of 1100–1600 K using a shock tube, and new data were provided for dual-fuel engine design, kinetic model development, and computational simulation. A recently published pentane isomer model was validated and used for kinetic analysis. It is found that the autoignition delay of n-pentane becomes longer as the equivalence ratio (fuel/air) increases. However, for DME, the dependence upon the equivalence ratio is inverse to that of n-pentane. Autoignition delays of DME/n-pentane mixtures become shorter with the increased DME proportion, except for the ϕ = 0.5 conditions, where the autoignition delays of DME and n-pentane are identical.