Comparison of Different CH4-Air Combustion Mechanisms in a Perfectly Stirred Reactor with Oscillating Residence Times Close to Extinction
Comparison of Different CH4-Air Combustion Mechanisms in a Perfectly Stirred Reactor with Oscillating Residence Times Close to Extinction
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DOI：
10.1080/00102202.2016.1138810
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发表时间：
2016-05
影响因子：
1.9
通讯作者：
L. Acampora;F. Marra;E. Martelli
中科院分区：
文献类型：
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作者：
L. Acampora;F. Marra;E. Martelli
用有向关系图法对完全搅拌反应器(PSR)中甲烷-空气混合物的燃烧进行了暂态模拟，包括全局一步和两步简化(用有向关系图法)和详细的化学反应机理。仔细选择了模拟条件，以观察振荡停留时间接近消光的PSR的动态特性。在很大的数值范围内，研究了振荡幅度和频率的影响。将全局机理和简化机理的温度响应与GRI Mech 3.0的详细反应机理的温度响应进行了比较。对结果的讨论指出了与采用全球反应机制有关的限制和问题。比较结果表明，对于具有振荡停留时间的PSR中甲烷-空气燃烧的准确描述，采用全局机理是不够的。这种比较突出表明，采用选定的两步机制只增加了很小的好处。相反，简化的反应机理与详细的反应机理表现出很好的一致性。
ABSTRACT Transient simulations of the methane-air mixture combustion in a Perfectly Stirred Reactor (PSR) with global one-step and two-step, reduced (by directed relation graph method) and detailed chemical reaction mechanisms, have been conducted. The simulation conditions were carefully selected to observe the dynamic of a PSR with an oscillating residence time close to the extinction. The effect of the oscillation amplitude and frequency have been investigated over a wide range of values. The temperature response of the global and reduced mechanism has been compared to that of the detailed reaction mechanisms, the GRI Mech 3.0. The discussion of results points out limits and problems associated with the adoption of global reaction mechanisms. The results of the comparison indicate that the adoption of a global mechanism is not adequate in order to obtain an accurate description of methane-air combustion in a PSR with an oscillating residence time. This comparison underlines that only a little benefit is added by the adoption of the selected two-step mechanism. Instead, the reduced mechanism shows an excellent agreement with the detailed reaction mechanism.