沈阳航空航天大学毕业设计（论文）
某型航空发动机燃烧室性能数值模拟
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某型航空发动机燃烧室性能数值模拟
摘 要
本文以某型燃气轮机燃烧室为研究对象，该型燃烧室是环形燃烧室，为了取得满意的模拟结果，同时考虑到计算机的计算能力，截取了带有三个头部的火焰筒扇形段作为计算模型。使用Gambit软件完成了燃烧室模型的建立，采用Fluent软件对某型发动机最大状态燃烧室流场及温度场进行数值模拟，得出燃烧室典型截面的流场、温度场，并对计算结果进行了分析。分析计算结果表明，火焰的最高温度位于主燃孔的轴向位置，火焰温度在主燃孔附近达到最高温度后开始下降，燃烧室出口温度场中，出口截面最高温度为1820K，平均温度为1342K，温度分布整体上比较均匀。燃烧室出口的平均速度为128.99m/s,这些数值符合环形燃烧室的燃烧特点，可见数值模拟在一定程度上可以真实反应火焰筒内的气流结构和燃烧过程。这些结果为今后燃烧室的设计、改进、研制和发展提供有价值的参考依据和基础数据。 关键词：燃烧室；温度场；数值模拟；流场；
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沈阳航空航天大学毕业设计（论文）
Numerical Simulation of Combustor Performance of
Certain Aero-Engine
Abstract
This article is aimed at studying certain aero-engine, this type of combustion chamber is annular, in order to obtain satisfactory simulation results, considering calculation capacity of the computer, we have intercepted flame canister fan-shaped section with three heads as a computation model. We have used Gambit software to complete the combustion model, using Fluent software to simulate the peak load of this aero-engine combustion chamber flows and state, to conclude the flow field of combustion chamber typical section, the temperature field .Then the obtained results are analyzed. Analysis shows that the calculation results are acute, it also shows that the highest temperature of flame is in the axial position of the primary holes, the flame temperature on the primary holes began to fall after the highest temperature near the combustion chamber, in the field of outlet temperature, the highest temperature of export section is 1820K, the average temperature is 1342K, the distribution of the temperature is overall even. The average speed of combustion chamber exports is 128.99 m/s, these values match the annular combustion chamber combustion characteristics, it is visible that in some extent numerical simulation could actual response in the combustor liner airflow structure and burning process. These results provide valuable reference basis and data for the design, improvement, development and improvement of the combustion chamber in the future.
Keywords: combustor; Numerical simulation; Velocity field; Temperature field
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某型航空发动机燃烧室性能数值模拟
目 录
1 绪论 ................................................................................................................................... 1 1.1 引言 ............................................................................................................................... 1 1.2 航空发动机燃烧室的工作情况 ................................................................................... 2 1.3 燃烧室的研究方法 ....................................................................................................... 3 1.4 燃烧室数值模拟的现状和发展 ................................................................................... 4 1.5 数值分析在燃烧室模拟中的应用 ............................................................................... 5 1.6 本课题研究对象及内容 ............................................................................................... 6 2 燃烧室数值模拟的数学模型及其数值解法 ................................................................... 7 2.1 基本数学物理模型 ....................................................................................................... 7 2.1.1 基本控制方程 .......................................................................................................... 7 2.1.2 湍流模型 .................................................................................................................. 9 2.1.3 燃烧模型 .................................................................................................................. 9 2.1.4 辐射模型 ................................................................................................................ 13 2.1.5 微分方程组的通用形式 ........................................................................................ 13 2.2 数值计算方法 ............................................................................................................. 14 2.2.1 三维气相燃烧流场的离散方程 ............................................................................ 14 2.2.2 离散化方程的求解 ................................................................................................ 16 3 软件选择与模型建立 ..................................................................................................... 18 3.1 软件的选择 ................................................................................................................. 18 3.1.1 FLUENT软件 ......................................................................................................... 18 3.1.2 GAMBIT软件 ........................................................................................................ 18 3.2 燃烧模型的建立及网格划分 ..................................................................................... 19 3.3 边界条件 ..................................................................................................................... 20 4 模拟结果和分析 ............................................................................................................. 22 4.1 引言 ............................................................................................................................. 22 4.2 温度场模拟结果及分析 ............................................................................................. 23 4.3 速度场模拟结果及分析 ............................................................................................. 27 5 结论 ................................................................................................................................. 32 参考文献 ............................................................................................................................. 34
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沈阳航空航天大学毕业设计（论文）
致 谢 ................................................................................................. 错误！未定义书签。
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