微型燃机低污染燃烧室的流动分析与优化设计

【作者】 徐世泊；

【导师】 冀春俊；

【作者基本信息】 大连理工大学 ， 动力机械与工程， 2004， 硕士

【摘要】 微型燃气轮机具有高效、可靠、外形紧凑及污染物排放量少等优点，应用前景十分可观。燃烧室是燃气轮机的关键部件之一，其几何结构和内部流动非常复杂，设计难度较高，数值模拟的方法是研究其流动规律的一种有效途径。本文利用STAR-CD等软件为基础建立了一个基于完整真实的三维几何结构的燃烧室内部流动数值分析平台；微型燃机燃烧室的设计采用贫预混的方式实现低污染排放，本文利用所建立的计算分析平台对其内部流动进行了较深入细致的研究，针对流动中存在的问题，提出了一系列的改进措施，有效的改进了燃烧室内部流场的结构，初步实现了燃烧室的结构优化。在建立模型的过程中，基本实现了燃烧室几何结构的完整真实性，在划分计算网格时又对细小的结构进行了网格的局部细化，这些措施都保证了计算结果能够更加真实的描述燃烧室流场中的各种流动特征。数值试验的结果表明，本文所建立的数值分析平台对燃烧室的设计优化提供了一个实用的工具。更多还原

【Abstract】 Combustion chamber is one of the key components in gas turbine. The design of he combustion chamber is a challenging task because of the highly complexity of the geometry structure and the internal flow of the combustion chamber. A successful design needs the detailed study of the flow inside the combustion chamber based the state-of-art CFD techniques and experimental research works. A numerical analytic system based on the real three-dimensional geometry structure and powerful commercial software such as STAR-CD, Pro-E, Pro-am’ was established in this thesis for the study of the internal flow and the optimization of the geometry structure of the combustion chamber. Numerical analysis was carried out for the primary design of one low emission combustion chamber for micro gas turbine. The main features of the flow field were obtained successfully and the problems in the flow field were analyzed. Solutions for the problems existed inside the flow field were proposed. Numerical experiments indicate that those modifications are very effective and a satisfactory flow structure inside the combustion chamber was established. The analytic system established has some advantages over the currently used models in that there is no simplification for the geometry at all. It can provide a powerful tool for the engineering analysis of the internal flow and geometry optimization for the combustion chamber.更多还原