...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Energy >Numerical simulations of combustion process in a gas turbine with a single and multi-point fuel injection system
【24h】

Numerical simulations of combustion process in a gas turbine with a single and multi-point fuel injection system

机译：具有单点和多点燃油喷射系统的燃气轮机燃烧过程的数值模拟

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The paper presents a numerical study of a medium size model of industrial gas turbine combustor. The research was conducted using the RANS (Reynolds Averaged Navier-Stokes) approach with k-epsilon model and LES (Large Eddy Simulation) with WALE (Wall Adapting Local Eddy viscosity) subgrid model. The simulations were performed in cold and reacting flow conditions. In the latter case, the combustion process was modelled using a steady flamelet model with chemical mechanisms of Smooke with 16 species and 25 elementary reactions, and the GRI-2.11 with 49 species and 277 elementary reactions including NO chemistry. In the first part of the paper, the numerical results were validated against experimental data including velocity field, temperature and species concentrations. The velocity components predicted for the cold flow agree very well with measurements. In the case of the simulations of the reacting flow, some discrepancies were observed in both the temperature field and species concentrations. However, the main flame characteristics were captured correctly. It turned out that the chemical kinetics had a larger impact on the results than the turbulence model. In the second part of the paper, we modified the fuel and air injection method and analysed how the changes introduced affect the flame dynamics. It was shown that: (i) depending on the distribution of air, the velocity, temperature and species composition in the upper part of the combustion chamber can be significantly altered; (ii) more substantial changes can be achieved by shifting the fuel injection points; their location outside the main recirculation zone leads to a dangerous situation resulting in overheating of the walls; (iii) it turns out that substantial differences in the flame characteristics in the upper part of the combustion chamber vanish approaching the outlet plane and the resulting mixture compositions are very similar. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文对工业燃气轮机燃烧室的中等尺寸模型进行了数值研究。该研究是使用RANS（雷诺平均Navier-Stokes）方法和k-ε模型以及LES（大涡模拟）和WALE（壁适应局部涡粘度）子网格模型进行的。模拟是在寒冷和反应流动的条件下进行的。在后一种情况下，使用稳态小火焰模型对燃烧过程进行建模，该模型具有Smooke具有16种和25个基本反应的化学机理，以及GRI-2.11具有49种和277个基本反应（包括NO化学）的化学机理。在本文的第一部分中，对数值结果与包括速度场，温度和物种浓度在内的实验数据进行了验证。为冷流预测的速度分量与测量值非常吻合。在模拟反应流的情况下，在温度场和物质浓度上都观察到一些差异。但是，主要火焰特性已被正确捕获。结果表明，与湍流模型相比，化学动力学对结果的影响更大。在本文的第二部分，我们修改了燃油和空气喷射方法，并分析了引入的变化如何影响火焰动力学。结果表明：（i）取决于空气的分布，燃烧室上部的速度，温度和物质组成可以显着改变； （ii）通过改变燃油喷射点可以实现更大的改变；它们在主循环区之外的位置会导致危险情况，导致壁过热； （iii）结果表明，燃烧室上部的火焰特性的实质差异在接近出口平面时消失，并且所得混合物组成非常相似。 （C）2016 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号