文档介绍：华北电力大学
毕业设计(论文)附件
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原文标题:Numerical analysis of flame behavior in gas bustors using LES
2008年月日
外文文献翻译原文
Numerical analysis of flame behavior in gas bustors using LES
J. Shinjo, Y. Mizobuchi and S. Ogawa
National Aerospace Laboratory of Japan
7-44-1 Jindaiji-higashimachi, Chofu, Tokyo 182-8522 JAPAN
Investigation of lean bustion dynamics in gas bustors is numerically conducted based on Large Eddy Simulation (LES) methodology. The bustors are a swirl-bustor and a flame holder bustor. Unsteady flame behavior is captured inside bustors. The unstable flame motions are mainly governed by acoustic resonance, velocity field fluctuations and heat release fluctuations. They are all coupled to bustion instabilities. Velocity field analysis around the flame holder in the bustor is also conducted to understand local flame shapes for further improvement of flame holder designing. It is demonstrated that numerical methods based on LES are effective prehending real-bustion dynamics bustors.
1. Introduction
Reduction of NOx emissions is a key issue in modern gas bustor systems due to environmental requirements. Lean bustion is one promising way to reduce emissions because the flame temperature is pared to conventional non-bustion. However, lean bustion is prone bustion instabilities, and this sometimes may lead to detrimental damage bustor systems. In order to attenuate unstable
combustion behavior, combustion control is considered effective. Our final goal is to achieve bustion over a wide range of operation conditions by passive/bustion control.
Toward the final goal bustion control, a detailed understanding bustion dynamics bustor systems is necessary because several factors are bustion behavior in plicated way. Mechanisms bustion instabilities have been investigated worldwide both experimentally and numerically [1,2]. bustion experiments, especially for high-pressure tests, measurements are usually difficult to conduct.