金属纤维燃烧器的数值模拟研究

发布时间：2018-03-16 08:05

本文选题：金属纤维　切入点：问题描述　出处：《华中科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：金属纤维燃烧器属于多孔介质燃烧技术的应用装置，比起传统的自由扩散火焰燃烧器，既具有污染物排放量小、燃烧强度高、回火安全性高的特点，还具有燃烧负荷范围大、燃烧充分程度高、较低的热惯性、良好的抗冲击性等优势。此外，其排烟损失小、运行噪音低，，符合当今节能减排的需求。本文以金属纤维燃烧器的技术原理为背景，运用Fluent商用软件对燃烧模拟进行研究，形成了初步模型，得出了相应模拟结果与分析结论。（1）首先，对实际金属纤维燃烧器的运行原理、特点、优势进行了详尽描述，总结出了建模难点与依据，提出了单、双排金属丝模型设想。在既定物理模型上，用数值模型与边界条件对其进行约束，形成了完整的问题描述，为数值求解算做好了准备。（2）对特定工况下的单、双排金属丝模型进行了数值模拟，获得了模型区域内的冷、热态气体流动规律，组分浓度分布，温度分布等结果。结果表明，计算完成了对各控制方程和所设置边界条件的表达。与此同时，结果反映出了一个问题，那就是两种模型燃烧反应位置存在失真。（3）针对模拟结果所反映的问题，对模拟结果进行了理论判断与分析。从火焰传播与火焰稳定机制，说明模拟结果存在理论上的失真；通过多工况模拟结果的对比分析、数学控制模型内核的剖析，得出导致模拟结果合理性差异的原因在于计算程序缺乏更为细致的数学控制方程的结论。
[Abstract]:Metal fiber burner belongs to the application device of porous media combustion technology. Compared with the traditional free diffusion flame burner, it has the characteristics of low pollutant emission, high combustion intensity, high tempering safety, and a wide range of combustion load. The advantages of high combustion adequacy, low thermal inertia, good impact resistance, and so on. In addition, its smoke loss is small, the running noise is low, and it meets the demand of energy saving and emission reduction. This paper takes the technical principle of metal fiber burner as the background. The combustion simulation is studied by Fluent commercial software, and a preliminary model is formed, and the corresponding simulation results and analysis conclusions are obtained. First of all, the operating principle, characteristics and advantages of the actual metal fiber burner are described in detail, the difficulties and basis of modeling are summarized, and the model assumption of single and double rows of wire is put forward. The numerical model and boundary conditions are used to constrain the problem, and a complete problem description is formed, which is ready for numerical calculation. (2) numerical simulation of single and double row wire model under specific working conditions is carried out, and the results of cold and hot gas flow, component concentration distribution and temperature distribution in the region of the model are obtained. The equations of control and the boundary conditions are expressed. At the same time, the results reflect the problem that there is distortion in the combustion reaction positions of the two models. 3) aiming at the problems reflected by the simulation results, the theoretical judgment and analysis of the simulation results are made. From the mechanism of flame propagation and flame stabilization, the theoretical distortion of the simulation results is explained. By analyzing the kernel of the mathematical control model, it is concluded that the reason for the difference in the rationality of the simulation results lies in the lack of more detailed mathematical control equations in the calculation program.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU996.7

【相似文献】