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Article

Hierarchical Auto-Ignition and Structure-Reactivity Trends of C2–C4 1-Alkenes

1
State Key Laboratory of Multiphase Flows in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
Science and Technology on Combustion, Internal Flow and Thermostructure Laboratory, School of Astronauties, Northwestern Polytechnical University, Xi’an 710072, China
*
Author to whom correspondence should be addressed.
Energies 2021, 14(18), 5797; https://doi.org/10.3390/en14185797
Submission received: 4 August 2021 / Revised: 4 September 2021 / Accepted: 8 September 2021 / Published: 14 September 2021
(This article belongs to the Special Issue Trends and Prospects in Engine Combustion)

Abstract

Ignition delay times of small alkenes are a valuable constraint for the refinement of the core kinetic mechanism of hydrocarbons used in representing combustion properties of real fuels. Moreover, the chemical reactivity comparison of those small alkenes provides a reference in object-oriented fuel design and logical combustion utilization. In this study, the ignition delay times of C2–C4 alkenes (ethylene, propene and 1-butene) were measured behind reflected shock waves first, with a fixed oxygen concentration (XO2 = 6%) and equivalence ratio (φ = 1.0) at various pressures of 1.2, 4.0 and 16.0 atm, in order to facilitate the comparison. Three chemical-based-Arrhenius-type correlations covering a wide range of temperature, pressure, equivalence ratio, and dilution were proposed. The simplified reaction network for pyrolysis and oxidation of 1-alkenes was depicted relying on the reaction classes of alkenes. Nine generally accepted mechanisms were used to simulate the ignition delay times measured by this study as well as literature. All the kinetic models show reasonable structure-reactivity trends for all of the three alkenes, but only NUIGMech 1.1 is capable of representing quantificationally the chemical reactivity at all tested conditions. Generally, ethylene exhibits the highest reactivity while propene presents the lowest at high temperatures. Analyses of sensitivity and flux indicate that the main oxidation pathway of ethylene is chain-branching, which accelerates the accumulation of free radical pools, especially for the Ḣ atom, Ȯ atom and ȮH radical, which results in the highest reactivity of ethylene. For propene and 1-butene, due to the presence of the allylic site, consumption of allylic radicals becomes the decisive step of oxidation and allylic radicals are mostly consumed by the HȮ2 radical. However, there are no such efficient reaction pathways for the formation of HȮ2 radicals during the propene oxidation process, while reaction pathways for HȮ2 formation in 1-butene are efficient. Thus, 1-butene presents higher reactivity compared to propene.
Keywords: 1-alkenes; Arrhenius correlation; reactivity comparison; chemical kinetics 1-alkenes; Arrhenius correlation; reactivity comparison; chemical kinetics

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MDPI and ACS Style

Sun, W.; Zhang, Y.; Li, Y.; Huang, Z. Hierarchical Auto-Ignition and Structure-Reactivity Trends of C2–C4 1-Alkenes. Energies 2021, 14, 5797. https://doi.org/10.3390/en14185797

AMA Style

Sun W, Zhang Y, Li Y, Huang Z. Hierarchical Auto-Ignition and Structure-Reactivity Trends of C2–C4 1-Alkenes. Energies. 2021; 14(18):5797. https://doi.org/10.3390/en14185797

Chicago/Turabian Style

Sun, Wuchuan, Yingjia Zhang, Yang Li, and Zuohua Huang. 2021. "Hierarchical Auto-Ignition and Structure-Reactivity Trends of C2–C4 1-Alkenes" Energies 14, no. 18: 5797. https://doi.org/10.3390/en14185797

APA Style

Sun, W., Zhang, Y., Li, Y., & Huang, Z. (2021). Hierarchical Auto-Ignition and Structure-Reactivity Trends of C2–C4 1-Alkenes. Energies, 14(18), 5797. https://doi.org/10.3390/en14185797

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