【作者】 司洪宇；

【导师】 梅宁；

【作者基本信息】 中国海洋大学 ， 工程热物理， 2008， 硕士

【摘要】 微型燃烧器的燃烧过程是一个复杂的物理化学现象,目前对此的了解只是来源于实验性的结论。因此,有必要对燃烧过程的可视化和数值解进行深入的研究和对设计原型机的性能进行有效的预测。随着燃烧理论的不断发展和计算机运算性能的不断提高,对微型燃烧器内部的流场分布、热交换和燃烧过程的数值模拟成为一种可能。本文就是基于Fluent软件对一款微型燃烧器内部的流场和换热过程进行了计算机数值模拟和实验研究。选用FLUENT中的RNG k-e湍流模型和耦合式换热模型为该微型燃烧器的数学模型,通过和实验结果相比对,对数学模型进行了多次拟合调整。分析最终数值模拟结果,对燃烧器的性能分析和结构改善提出了定性的参考建议。为了进一步改善燃烧器的流场分布、燃烧特性和提高换热性能,对影响燃烧器性能的12个因素在3水平下对燃烧器功率影响的显著性进行了正交试验模拟,最终找出了3个影响明显的结构参数,通过试验验证,证明数值模拟能够准确地反映实验规律。更多还原

【Abstract】 Combustion in a micro-combustor is a complex physical and chemical phenomena.Many current comprehensive to this is based upon experimental results, so that there are needs to understand combustion behaviors visibly and numerically, and even to predict the performances for a design prototype.The understandings to combustion and the improvement of computer performance make it possible to simulate fluid flow,heat transfer and combustion in a micro-combustor.The purpose of this thesis is to investigate internal flow and heat transfer in a micro-combustor based on commercial software FLUENT.A numerical model is established by using the RNG k-e turbulence model and the coupled heat transfer exchanging model of FLUENT.The fluid flow and heat transfer both in combustion chamber and in water cooling chamber of the combustor are simulated. By comparing with the result of experiment,the mathematical model is repeatedly fitted and adjusted.The result of numerical simulation has been analyzed and some qualitative proposals are presented to study the performance and to improve the structure of the combustion.In order to improve the distribution of the flow field,the performance of heat transfer and combustion further,an orthogonal test with 12 factors under 3 levels are simulated in FLUENT to find out the factors that are significant to the power of the combustion.And ultimately it is found that 3 structure parameters are significant.Through experiment,it is verified that the numerical simulation can accurately reflect the experiments’ rules.更多还原