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Chemical reactor networks for combustion systems modeling.

机译：用于燃烧系统建模的化学反应堆网络。

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This study shows the development and application of chemical reactor networks (CRN) for several combustion systems. The CRN development is based on results from computational fluid dynamics (CFD) simulations.; The University of Washington eight-step global kinetic mechanism for methane oxidation and NO formation is updated and validated in the CFD code for an experimental bluff body combustor. The CFD predicted emissions for the bluff body combustor are found to be in a good agreement with the experimental data. The eight-step global mechanism is then used in CFD modeling of generic and industrial gas turbine combustors.; The flow information from CFD modeling is analyzed and represented as an arrangement of chemical reactor elements. The CRN element arrangement, element volumes, and flow splits between the elements are adjusted based on the best agreement with CFD output over the range of pilot fuel flow rates for different premixer fuel-air ratio distributions. The resulting chemical reactor network consists of 31 elements representing zones typical of the generic swirl stabilized combustor: main premixer flame, pilot flame, post-flame, and center and dome recirculation zones. The NOx emissions predicted by CFD and CRN are in good agreement with one another for different injector configurations and for a range of pilot fuel flow rates.; By taking advantage of this detailed information for the generic combustor, the methodology for CFD to CRN translation is then developed. This methodology is applied to the industrial lean-premixed gas combustor. This CRN is applied to two test rig engine configurations for different engine sizes and injector circuit setups. The predicted NOx emissions are compared to the test rig emissions data for a range of pilot fuel flow rates and fuel types. Good agreement between the predicted NOx and the experiment data is found using both the GRI 3.0 mechanism and the global mechanism.; The CRN is able to handle complex chemical mechanisms and can provide significant insight into pollutant formation. Because of its small computational time requirement, the CRN can be used as tool for analysis of combustion systems and can be integrated into combustor design.
机译：这项研究显示了化学反应器网络（CRN）在几种燃烧系统中的开发和应用。 CRN的开发基于计算流体动力学（CFD）仿真的结果。华盛顿大学的甲烷氧化和NO形成的八步全球动力学机制已更新，并在CFD代码中对实验性钝体燃烧器进行了验证。 CFD预测钝体燃烧器的排放与实验数据非常吻合。然后，将八步全局机制用于通用和工业燃气轮机燃烧器的CFD建模。分析了来自CFD建模的流量信息，并将其表示为化学反应器元件的排列。 CRN元件的布置，元件的体积以及元件之间的流量分配是根据与CFD输出的最佳一致性来调整的，该输出在不同预混合器燃料空气比分布的引燃燃料流量范围内。最终的化学反应器网络由31个元素组成，这些元素代表了典型的旋流稳定燃烧器的典型区域：主预混火焰，引燃火焰，后火焰以及中心和圆顶再循环区域。 CFD和CRN预测的NOx排放量在不同的喷射器配置和一系列引燃燃料流量方面彼此非常吻合。通过利用通用燃烧器的详细信息，可以开发出CFD到CRN转换的方法。该方法应用于工业稀薄预混气体燃烧器。此CRN应用于两种试验台发动机配置，以用于不同的发动机尺寸和喷射器电路设置。对于一系列引燃燃料流量和燃料类型，将预测的NOx排放量与测试台排放数据进行比较。使用GRI 3.0机制和全局机制都可以发现预测的NOx与实验数据之间的一致性。 CRN能够处理复杂的化学机制，并且可以提供有关污染物形成的重要见解。由于CRN所需的计算时间短，因此可以用作分析燃烧系统的工具，并且可以集成到燃烧室设计中。

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