本文選題：金屬纖維　切入點：問題描述　出處：《華中科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：金屬纖維燃燒器屬于多孔介質燃燒技術的應用裝置，比起傳統(tǒng)的自由擴散火焰燃燒器，既具有污染物排放量小、燃燒強度高、回火安全性高的特點，還具有燃燒負荷范圍大、燃燒充分程度高、較低的熱慣性、良好的抗沖擊性等優(yōu)勢。此外，其排煙損失小、運行噪音低，，符合當今節(jié)能減排的需求。本文以金屬纖維燃燒器的技術原理為背景，運用Fluent商用軟件對燃燒模擬進行研究，形成了初步模型，得出了相應模擬結果與分析結論。 （1）首先，對實際金屬纖維燃燒器的運行原理、特點、優(yōu)勢進行了詳盡描述，總結出了建模難點與依據(jù)，提出了單、雙排金屬絲模型設想。在既定物理模型上，用數(shù)值模型與邊界條件對其進行約束，形成了完整的問題描述，為數(shù)值求解算做好了準備。 （2）對特定工況下的單、雙排金屬絲模型進行了數(shù)值模擬，獲得了模型區(qū)域內的冷、熱態(tài)氣體流動規(guī)律，組分濃度分布，溫度分布等結果。結果表明，計算完成了對各控制方程和所設置邊界條件的表達。與此同時，結果反映出了一個問題，那就是兩種模型燃燒反應位置存在失真。 （3）針對模擬結果所反映的問題，對模擬結果進行了理論判斷與分析。從火焰?zhèn)鞑ヅc火焰穩(wěn)定機制，說明模擬結果存在理論上的失真；通過多工況模擬結果的對比分析、數(shù)學控制模型內核的剖析，得出導致模擬結果合理性差異的原因在于計算程序缺乏更為細致的數(shù)學控制方程的結論。
[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.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU996.7

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