共查询到19条相似文献,搜索用时 343 毫秒
1.
2.
本文针对某燃气轮机环管型燃烧室三维冷态流场的数值模拟问题进行了研究。根据该型燃气轮机燃烧室的设计图纸建立真实的三维计算几何模型;在计算中采用SIMPLE算法,k-ε双方程湍流模型,对其进行了冷态空气流场的数值模拟;通过对各处流场分布的分析,特别是对主要区域各关键截面的流动分析,可以判断出燃烧室设计的合理性,为进一步优化燃烧室的结构设计、改善流场结构,并为开展燃烧室热态流场的数值模拟奠定了基础。 相似文献
3.
4.
5.
6.
针对某型燃气轮机环形燃烧室,通过数值模拟,对比分析了Standardk—ε、RNGk-ε、Realizable k-ε、Standard k-ω、雷诺应力五种湍流模型以及简单概率密度模型(PDF)、有限速率模型、涡耗散模型(ED)、涡耗散概念模型(EDC)四种燃烧模型对环形燃烧室性能计算的影响。结果表明:Realizable k-ε模型模拟的冷态流场与PIV试验测量结果最符合;EDC模型最能合理的模拟燃烧效果,但在预测NOx排放时不如有限速率模型精确。以上结论为后续该型号燃气轮机环形燃烧室的数值计算和设计提供了参考。 相似文献
7.
燃气轮机燃烧室内部流场的冷态模拟与优化设计 总被引:1,自引:0,他引:1
利用流体分析软件STAR-CD对一个燃气轮机燃烧室的内部流场完整真实的几何结构进行了三维的冷态模拟;得出其内部的流场分布,对其加以分析,找出原设计中存在的问题,并加以改进,得出更加合理的流场分布,从而指导燃烧室的结构设计。改进后的数值模拟结果表明,改进措施的效果是十分明显的,所建立的流动分析系统为燃气轮机燃烧室的优化设计提供了强有力的计算分析工具。 相似文献
8.
9.
10.
对PG9351FA燃气轮机的进气加热系统扩大DLN 2.0 燃烧室预混燃烧工作范围和限制压比超限的作用进行了详细地阐述和分析。 相似文献
11.
Paolo Gobbato Massimo MasiAndrea Toffolo Andrea Lazzaretto 《International Journal of Hydrogen Energy》2011,36(13):7993-8002
The interest for hydrogen-fuelled combustors is recently growing thanks to the development of gas turbines fed by high content hydrogen syngas. The diffusion flame combustion is a well-known and consolidated technology in the field of industrial gas turbine applications. However, few CFD analyses on commercial medium size heavy duty gas turbine fuelled with pure hydrogen are available in the literature. This paper presents a CFD simulation of the air-hydrogen reacting flow inside a diffusion flame combustor of a single shaft gas turbine. The 3D geometrical model extends from the compressor discharge to the gas turbine inlet (both liner and air plenum are included). A coarse grid and a very simplified reaction scheme are adopted to evaluate the capability of a rather basic model to predict the temperature field inside the combustor. The interest is focused on the liner wall temperatures and the turbine inlet temperature profile since they could affect the reliability of components designed for natural gas operation. Data of a full-scale experimental test are employed to validate the numerical results. The calculated thermal field is useful to explain the non-uniform distribution of the temperature measured at the turbine inlet. 相似文献
12.
13.
对中等功率ГТЭ-65发电用燃气轮机装置研制过程和设计理念,包括热力系统参数的选择、3大部套(压气机、燃烧室和涡轮)的设计及其特点、主要部件的模型和试验台试验、应用的可能性和进一步升级改进的途径做了综述。利用已有的研制成果,使用按比例绘制的方式,对压气机采用了全模拟设计。按照DLN或DLE原理,满足为实现燃料低排放燃烧的一系列条件,设计了低排放环形燃烧室。通过方案比较,采用了4级涡轮设计。除第四级动叶外,涡轮所有叶片都是冷却的。ГТЭ-65是符合当代"F"级技术水准的一型中等功率燃气轮机,既可用于简单循环燃气轮机电站,也可用于基于燃气轮机的蒸燃联合循环电站;既可用于基本负荷运行,也可用于半峰值和峰值负荷运行。 相似文献
14.
参考现有某重型燃气轮机环型燃烧室,运用FLUENT软件对其喷嘴结构及燃烧室部分进行三维数据模拟及分析,通过数值模拟分析燃烧过程速度、压力、温度等变量的分布规律,以及对燃烧室不同截面的流场分布规律的分析,特别是对主要区域各关键截面的流场分析,从而判断出燃烧室设计的合理性,为进一步优化燃烧室的结构设计、改善流场结构奠定基础. 相似文献
15.
对一种模型燃气轮机燃烧室中的三维反应流进行了数值模拟,模型燃烧室的燃料是CH4,燃烧类型是预混燃烧,在数值模拟过程中,采用了Spalding于1995年提出来的多流体模型来对燃烧室中的湍流预混燃烧进行了数值模拟,在数值模拟过程中考虑了辐射问题,采用了六通量辐射模型。通过数值模拟给出了速度,压力,湍流脉动动能,湍流动能耗散率,焓值,湍流粘度,温度,密度,燃烧产物质量分数,氧的质量分数,燃料/空气混合比,燃料质量分数,空间三个方向的辐射热通量以及各种流体的质量分数等变量的分布情况,此外,还采用传统的旋涡破碎模型对此燃烧室进行了数值模拟,并对两种方法的结果进行了分析比较,由分析可以看出多流体模型的结果接近于实际情况,对模型燃烧室进行三维反应流数值模拟的工作为今后对实际燃烧室反应流的数值模拟打下了一定的基础。 相似文献
16.
为研究湿度对燃烧特性的影响,采用湍流雷诺应力模型和层流小火焰模型,对湿空气透平(HAT)循环燃气轮机带有旋流器的燃烧室内甲烷扩散燃烧过程进行了数值模拟对比了在4种不同空气含湿量(0、100、200、300g/kg(DA))情况下的燃烧室内部温度场、速度场以及NO组分分布的情况,分析了湿度对HAT循环燃烧室扩散燃烧特性的影响结果表明,加湿降低了整个燃烧室的温度,并使其内部温度分布更加均匀;加湿使燃烧室的NO浓度大大降低;加湿减小了回流区长度。 相似文献
17.
In this article, a design optimization technique for mixing in a gas turbine combustor is presented. The technique entails the use of computational fluid dynamics and mathematical optimization to optimize the combustor exit temperature profile. Combustor geometric parameters were used as optimization design variables. This work does not intend to suggest that combustor exit temperature profile is the only performance parameter important for the design of gas turbine combustors. However, it is a key parameter of an optimized combustor that is related to the power output and durability of the turbine. The combustor in this study is an experimental liquid-fuelled atmospheric combustor with a turbulent diffusion flame. The computational fluid dynamics simulations use a standard k-? model. The optimization is carried out with the Dynamic-Q algorithm, which is specifically designed to handle constrained problems where the objective and constraint functions are expensive to evaluate. The optimization leads to a more uniform combustor exit temperature profile than with the original one. 相似文献
18.
19.
A general-purpose performance prediction program, which can simulate various types of gas turbine such as simple, recuperative, and reheat cycle engines, has been developed. A stage-stacking method has been adopted for the compressor, and a stage-by-stage model including blade cooling has been used for the turbine. The combustor model has the capability of dealing with various types of gaseous fuels. The program has been validated through simulation of various commercial gas turbines. The simulated design performance has been in good agreement with reference data for all of the gas turbines. The average deviations of the predicted performance parameters (power output, thermal efficiency, and turbine exhaust temperature) were less than 0.5% in the design simulations. The accuracy of the simulation of off-design operation was also good. The maximum root mean square deviations of the predicted off-design performance parameters from the reference data were 0.22% and 0.44% for the two simple cycle engines, 0.22% for the recuperative cycle engine, and 0.21% for the reheat cycle engine. Both the design and off-design simulations confirmed that the component models and the program structure are quite reliable for the performance prediction of various types of gas turbine cycle over a wide range of operations. 相似文献