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首页> 外文期刊>Combustion Science and Technology >EXPERIMENTAL STUDY OF STABILITY, STRUCTURE AND CH~* CHEMILUMINESCENCE IN A PRESSURIZED LEAN PREMIXED METHANE TURBULENT FLAME
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EXPERIMENTAL STUDY OF STABILITY, STRUCTURE AND CH~* CHEMILUMINESCENCE IN A PRESSURIZED LEAN PREMIXED METHANE TURBULENT FLAME

机译：加压稀混合甲烷湍流火焰的稳定性，结构和CH〜*化学发光的实验研究

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摘要

The present experimental study investigates the main parameters governing structure and stability of a natural gas premixed lean flame, close to conditions encountered in gas turbines. A scale-model of a gas turbine combustion chamber has been equipped with a quartz tube in order to visualize flame and to perform measurements of CH~* chemiluminescence. The combustion chamber can be pressurized up to 0.4 MPa, and combusting air temperature can be preheated up to 673K. The influence of swirl number, equivalence ratio, pressure, combusting air temperature, and flow rate are studied. Stability domain and possible operating range depend on swirl number. For a given swirler and for fixed conditions of pressure and temperature, different flame regimes are encountered and flame regime limits depend only on equivalence ratio. Moreover blow-off limit can be strongly decreased by increasing combusting air temperature whereas pressure increase has no significant influence. The evolution of mean global flame CH~* emission as function of pressure, temperature, and equivalence ratio is found to be similar to that observed by other authors in a laminar flame, except close to the blow-off limit.
机译：本实验研究调查了天然气预混稀薄火焰的结构和稳定性的主要参数，接近燃气轮机遇到的条件。燃气轮机燃烧室的比例模型已装有石英管，以便可视化火焰并进行CH〜*化学发光的测量。燃烧室可加压至0.4 MPa，燃烧空气温度可预热至673K。研究了旋流数，当量比，压力，燃烧空气温度和流量的影响。稳定性域和可能的工作范围取决于旋流数。对于给定的旋流器以及在固定的压力和温度条件下，会遇到不同的火焰状态，并且火焰状态限制仅取决于当量比。此外，可以通过提高燃烧空气温度来大大降低吹扫极限，而压力的升高没有明显的影响。发现平均总体火焰CH〜*排放量随压力，温度和当量比的变化与其他作者在层流火焰中观察到的相似，只是接近吹散极限。

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