Detonation development from a hot spot in methane/air mixtures: Effects of kinetic models

Su, Jingyi1; Dai, Peng2; Chen, Zheng1

2020-08-02

10.1177/1468087420944617

International Journal of Engine Research   影响因子和分区

1468-0874

2041-3149

Natural gas is a promising alternative fuel which can be used in internal combustion engines to achieve low carbon emission and high thermal efficiency. However, at high compression ratio, super-knock due to detonation development might occur. In this study, the autoignitive reaction front propagation and detonation development from a hot spot were investigated numerically and the main component of natural gas, methane, was considered. The objective is to assess the performance of different kinetic models in terms of predicting hot spot-induced detonation development in methane/air mixtures. First, simulations for the constant-volume homogeneous ignition in a stoichiometric methane/air mixture were conducted. The ignition delay time, excitation time, critical temperature gradient, thermal sensitivity and reduced activation energy predicted by different kinetic models were obtained and compared. It was found that there are notable discrepancies among the predictions by different kinetic models. Then, hundreds of one-dimensional simulations were conducted for detonation development from a hot spot in a stoichiometric CH4/air mixture. Different autoignition modes were identified and the detonation regimes were derived based on the peak pressure and reaction front propagation speed. It was found that even at the same conditions, different propagation modes can be predicted by different kinetic models. The broadest detonation development regime was predicted by the reduced GRI mechanism, while a relatively narrow regime was predicted by the recent kinetic models such as FFCM-1 and Aramco 3.0. The present results indicate that super-knock prediction strongly depends on the kinetic model used in simulations. Therefore, significant efforts should be devoted to the development and validation of kinetic models for natural gas at engine conditions.

Detonation development REACTION FRONT PROPAGATION autoignition N-HEPTANE/AIR MIXTURE hot spot LAMINAR FLAME SPEEDS methane IGNITION DELAY kinetic model PRE-IGNITION AUTO-IGNITION SUPER-KNOCK TEMPERATURE-GRADIENT CHEMICAL-KINETICS COMBUSTION

SCI ; EI

英语

其他

National Natural Science Foundation of China[91741126][51861135309]

Thermodynamics ; Engineering ; Transportation

Thermodynamics ; Engineering, Mechanical ; Transportation Science & Technology

WOS:000555485900001

SAGE PUBLICATIONS LTD

20203209015566

Gases ; Ignition ; Kinetic parameters ; Mixtures ; Combustion knock ; Forecasting ; Natural gas ; Kinetic theory ; Activation energy ; Temperature ; Detonation ; Thermal efficiency

Fuel Combustion:521.1 ; Gas Fuels:522 ; Internal Combustion Engines, General:612.1 ; Fluid Flow, General:631.1 ; Thermodynamics:641.1 ; Heat Transfer:641.2 ; Organic Compounds:804.1 ; Classical Physics; Quantum Theory; Relativity:931

Web of Science

1.Peking Univ, Dept Mech & Engn Sci, Coll Engn, SKLTCS,CAPT,BIC ESAT, Beijing 100871, Peoples R China;
2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen, Guangdong, Peoples R China

Su, Jingyi,Dai, Peng,Chen, Zheng. Detonation development from a hot spot in methane/air mixtures: Effects of kinetic models[J]. International Journal of Engine Research,2020,22:2597-2606.

Su, Jingyi,Dai, Peng,&Chen, Zheng.(2020).Detonation development from a hot spot in methane/air mixtures: Effects of kinetic models.International Journal of Engine Research,22,2597-2606.

Su, Jingyi,et al."Detonation development from a hot spot in methane/air mixtures: Effects of kinetic models".International Journal of Engine Research 22(2020):2597-2606.