• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Congress of the International Council of the Aeronautical Sciences; 20060903-08; Hamburg(DE) >INVESTIGATION OF A COMBUSTOR USING A PRESUMED JPDF REACTION MODEL APPLYING RADIATIVE HEAT LOSS BY THE MONTE CARLO METHOD
【24h】

INVESTIGATION OF A COMBUSTOR USING A PRESUMED JPDF REACTION MODEL APPLYING RADIATIVE HEAT LOSS BY THE MONTE CARLO METHOD

机译：使用蒙特卡罗方法的推定JPDF反应模型研究应用辐射热损失的燃烧器

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

In order to predict the stability limits of a model gas turbine combustion chamber, a non-adiabatic presumed-pdf reaction model applying a global chemical kinetics scheme has been developed. Radiative heat loss in the combustor has been taken into account by means of the Monte Carlo Method. The investigations are carried out for aerodynamically stabilised flames under high turbulence and lean mixture conditions applying modern airblast nozzles. Such applications cover a wide range of operation conditions where stable combustion has to be guaranteed. Therefore, a growing demand exists for the knowledge of lean blow out limits, which is an important design parameter for the dimensioning of combustor airflows. The reaction kinetic of the combustion process is influenced by the state of mixing as well as by the temperature distribution in the flow field. Hence, to consider the influence of the temperature distribution on the chemical reaction process in turbulent flames, in terms of the spatial temperature distribution and temperature fluctuations is essential for flame stability. The claim for numerical models to predict stability, thus, is very challenging. In contrast to many stability models which mainly are based on global quantities, numerical models using local quantities offer the highest possible flexibility concerning variation of examined geometry and operating conditions. In case of confined diffusive swirl-flames, the consideration heat transfer processes is crucial but, the exclusive consideration of convec-tive heat transport has proven to be unsuitable. Thus, for an adequate prediction of the temperature distribution in a combustor and on the combustor walls, respectively, both phenomena have to be accounted for. Both of these processes, heat release and heat transfer, are described by statistical approaches in this work due to the high accuracy that can be achieved by these model types.
机译：为了预测模型燃气轮机燃烧室的稳定性极限，已经开发了使用整体化学动力学方案的非绝热假定pdf反应模型。已经通过蒙特卡洛方法考虑了燃烧室中的辐射热损失。使用现代喷气喷嘴对在高湍流和稀薄混合条件下的空气动力学稳定的火焰进行了研究。这种应用涵盖了必须保证稳定燃烧的广泛运行条件。因此，对于稀薄吹气极限的知识的需求不断增长，稀薄吹气极限是燃烧器气流尺寸确定的重要设计参数。燃烧过程的反应动力学受混合状态以及流场中温度分布的影响。因此，要考虑温度分布对湍流火焰中化学反应过程的影响，就空间温度分布和温度波动而言，对于火焰稳定性至关重要。因此，要求使用数值模型来预测稳定性是非常具有挑战性的。与许多主要基于全局量的稳定性模型相比，使用局部量的数值模型在检查几何形状和操作条件的变化方面提供了最大的灵活性。对于局限性扩散旋流火焰，考虑传热过程至关重要，但仅考虑对流传热是不合适的。因此，为了适当地分别预测燃烧器中和燃烧器壁上的温度分布，必须考虑两种现象。由于这些模型类型可以实现很高的准确性，因此在本工作中通过统计方法描述了这两个过程，即放热和传热。

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