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Comparative study on chemical kinetic schemes for dual-fuel combustion of n-dodecane/methane blends

机译：正十二烷/甲烷共混物双燃料燃烧化学动力学方案的比较研究

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摘要

The ignition characteristics of dual-fuel mixtures consisting of high-reactivity n-dodecane and low-reactivity methane are numerically investigated. The performance of five state-of-the-art n-dodecane chemical mechanisms including comprehensive low hydrocarbon kinetics for single-fuel (SF) and dual-fuel (DF) combustion are studied. The sensitivity of the total fuel to air equivalence ratio (phi) and n-dodecane to methane mole ratio (alpha) on the DF combustion process is investigated. We point out how n-dodecane enables faster methane ignition by rapidly formed radicals. Methane is shown to act as a diluent prolonging the ignition delay time (IDT) compared to a SF n-dodecane case by a factor ranging between 1 and 8 at the present conditions. For the first time, (1) DF combustion for n-dodecane is investigated and IDTs are quantified in terms of alpha and phi, (2) DF IDTs are indicated to be bounded by SF methane and n-dodecane IDTs, (3) performance of the state-of-the-art n-dodecane kinetic schemes for SF and DF combustion are pointed out, (4) the laminar flame speeds for n-dodecane and methane combustion are numerically evaluated and shown to be bounded by the SF flame speeds, and (5) examples on the most sensitive reaction steps in DF cases are pointed out for laminar flame speed. Moreover, the results indicate that a is a key control factor dictating the DF IDT. Finally, the mechanisms which could serve as reasonable candidates for future SF and DF combustion are suggested. (C) 2016 Elsevier Ltd. All rights reserved.
机译：数值研究了由高反应性正十二烷和低反应性甲烷组成的双燃料混合物的着火特性。研究了五种最先进的正十二烷化学机理的性能，包括用于单燃料（SF）和双燃料（DF）燃烧的全面低烃动力学。研究了DF燃烧过程中总燃料与空气当量比（phi）和正十二烷与甲烷摩尔比（α）的敏感性。我们指出正十二烷如何通过快速形成的自由基使甲烷燃烧更快。在当前条件下，与SF n-十二烷相比，甲烷可作为稀释剂，将点火延迟时间（IDT）延长1到8倍。第一次，（1）研究了正十二烷的DF燃烧，并根据α和phi量化了IDT，（2）表明DF IDT受SF甲烷和正十二烷IDT的限制，（3）性能指出了用于SF和DF燃烧的最先进的正十二烷动力学方案，（4）对正十二烷和甲烷燃烧的层流火焰速度进行了数值评估，并显示出受SF火焰速度限制（5）指出了DF情况下最敏感的反应步骤的层流火焰速度。此外，结果表明，a是决定DF IDT的关键控制因素。最后，提出了可以作为未来SF和DF燃烧的合理候选者的机制。 （C）2016 Elsevier Ltd.保留所有权利。

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