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Investigation of Reduced Kinetics Mechanisms for Accurate LES and Scaling of the Dynamics of Premixed Swirling Oxy-Fuel Combustion

机译:预混旋转氧燃烧燃烧动态的准确作用减少动力学机制

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In this paper, we examine the role of reduced chemical kinetics mechanisms in predicting the flow structure using multi-dimensional large-eddy simulations in complex geometries. We investigate the attributes of the kinetics mechanisms required to predict flow structures such as recirculation zones. Premixed methane-oxy combustion is modeled in a swirl-stabilized combustor. Results show that kinetic mechanisms that accurately predict the extinction strain rate of the underlying flames were able to predict the evolution of the flame macrostructure with equivalence ratio and the associated velocity profiles. The recirculation zone length was found to linearly scale with the extinction strain rate, in agreement with previous findings in different fuel-oxidizer mixtures and combustor geometry. The scaling holds regardless of fuel or oxidizer type, Reynold's number or inlet temperature. Surprisingly the scaling also held well for two different combustor geometries.
机译:在本文中,我们研究了减少化学动力学机制在预测使用复杂几何形状中的多维大涡模拟预测流动结构的作用。 我们研究了预测再循环区域的流动结构所需的动力学机制的属性。 预混合的甲烷 - 氧气燃烧采用涡流稳定的燃烧器。 结果表明,能够精确预测底层火焰的消光应变率的动力学机制能够预测火焰大圆体与等同率和相关的速度谱的进化。 发现再循环区长度与消光应变率线性规模,同时与不同的燃料氧化剂混合物和燃烧器几何形状中的先前发现。 无论燃料或氧化剂类型,Reynold的数量或入口温度如何,缩放保持。 令人惊讶的是,这两个不同的燃烧室几何形状也保持良好。

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