Effect of Inert Species On the Static and Dynamic Stability of a Piloted, Swirl-Stabilized Flame

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Javier Rodriguez Camacho, Michel Akiki, James Blust, Jacqueline O'Connor
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引用次数: 0

Abstract

Abstract Carbon sequestration and utilization has been proposed as a method for decarbonizing high-efficiency gas turbines operating on natural gas fuels. To increase the efficiency of the carbon removal process, exhaust gas recirculation (EGR) can be used. EGR recycles a portion of the engine exhaust into the inlet, increasing the concentration of inert species in the exhaust stream to improve the performance and cost effectiveness of CO2 separation systems. This strategy can reduce the oxygen concentration in the air, leading to changes in flame stabilization. In this study, we investigate the effect of air diluted with inert gases and the impact that these mixtures have on static and dynamic stability. A swirl-stabilized flame in a single-nozzle, variable-length combustor is used to measure the flame behavior for oxygen concentrations of 15% to 21% by volume. A constant flame temperature test matrix is conducted to mimic operation in an industrial gas turbine. High-speed chemiluminescence imaging is used to determine the change in flame shape and dynamics for each gas composition. As the oxygen concentration decreases, the flame lifts, resulting in an aerodynamically-stabilized flame at the lowest O2 concentrations. Different compositions of gases result in different flame shapes, where higher levels of N2 in the diluents result in more flame stabilization in the outer recirculation zone as compared to those with higher levels of CO2. The flame oscillation mechanisms also change with oxygen concentration, where the lifted flames at low O2 levels exhibit an ignition/extinction oscillation mode.
惰性物质对旋涡稳定火焰静态和动态稳定性的影响
碳封存与利用已被提出作为天然气燃料高效燃气轮机脱碳的一种方法。为了提高除碳过程的效率,可以使用废气再循环(EGR)。EGR将一部分发动机废气回收到进气道中,增加废气流中惰性物质的浓度,从而提高二氧化碳分离系统的性能和成本效益。这种策略可以降低空气中的氧气浓度,从而导致火焰稳定性的变化。在这项研究中,我们研究了用惰性气体稀释空气的影响,以及这些混合物对静态和动态稳定性的影响。在单喷嘴变长燃烧器中,用旋流稳定火焰测量氧气体积浓度为15%至21%时的火焰行为。采用恒火焰温度试验矩阵模拟工业燃气轮机的运行。高速化学发光成像用于确定每种气体成分的火焰形状和动力学变化。随着氧气浓度的降低,火焰升起,在最低的氧气浓度下产生空气动力学稳定的火焰。不同的气体组成导致不同的火焰形状,其中稀释剂中较高水平的N2与较高水平的CO2相比,在外循环区产生更多的火焰稳定。火焰振荡机制也随氧浓度的变化而变化,其中低氧水平下的提升火焰表现出点火/熄灭振荡模式。
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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