期刊
JOURNAL OF PROPULSION AND POWER
卷 37, 期 1, 页码 47-58出版社
AMER INST AERONAUTICS ASTRONAUTICS
DOI: 10.2514/1.B37942
关键词
-
The study found that an equivalence ratio of 0.79 in the primary combustion zone of a gas turbine combustor is optimal for high efficiency and low NOx emissions while maintaining flame stability. However, approaching the lean blowout limit can lead to intermittent low-frequency, high-amplitude pressure oscillations.
Lean operation in the primary combustion zone of a gas turbine combustor is advantageous from NOx reduction point of view. The present work deals with the influence of lean primary zone operation on combustion performance, NOx emissions, and flame stability of a model gas turbine combustor with simplex atomizer. Air distribution is varied to operate the primary combustion zone from stoichiometric to leaner operating conditions (phi(pri)=1.04-0.61), at fixed fuel flow rate and overall air-fuel ratio. Combustor performance is quantified with the help of gas temperature profile at exit and species concentrations at the end of primary zone. It is found that a primary zone equivalence ratio of 0.79 is optimal for high combustor efficiency and low NOx emissions, with a stable flame. When the primary zone equivalence ratio approaches the lean blowout (LBO) limit (phi(pri)similar to 0.5), intermittent low-frequency, high-amplitude pressure oscillations arise, especially at higher primary zone air flow rates. Inclusion of a metallic ring in the primary combustion zone widens the equivalence ratio for flame stability, with a small reduction in combustion efficiency. It also reduces the noise level and suppresses the intermittent high-amplitude oscillations close to LBO.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据