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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Combustion dynamics linked to flame behaviour in a partially premixed swirled industrial burner
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Combustion dynamics linked to flame behaviour in a partially premixed swirled industrial burner

机译：与部分预混合旋流工业燃烧器的火焰行为相关的燃烧动力学

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Previous work [Biagioli, F., Stabilization mechanism of turbulent premixed flames in strongly swirled flows, Combustion, Theory and Modelling 10 (3) (2006) 389-412; Guethe, F., Lachner, R., Schuermans, B., Biagioli, F., Geng, W., Inauen, A., Schenker, S., Bombach, R., Hubschmid, W., Flame imaging on the ALSTOM EV-burner: thermo acoustic pulsations and CFD-validation, in: AIAA Paper 2006-437 presented at the 44th AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada, January 9-12, 2006] has shown that turbulent dry low NO, (partially premixed) flames in high swirl conical burners may be subject to a large change of their anchoring location at the symmetry axis when a critical value of the bulk equivalence ratio is reached, i.e. they are bi-stable. This flame behavior is linked here to combustion pressure dynamics measured in an atmospheric test rig for a prototype version of the Alstom EnVironmental (EV) conical burner. The link is made via the solution of the problem of the 'travelling flameholder', which shows that the unsteady displacement of the flame anchoring location implies an unsteady variation of the flame surface area and therefore unsteady heat release. The relevance of this source of unsteady heat release-which is different from more usual ones due to variations in turbulent burning rate and in the sensible enthalpy jump across the flame-to the generation of combustion dynamics in strongly swirled flows is confirmed here by the strong positive correlation between the tendency of the flame to be displaced and the measured amplitude of pressure pulsations. (C) 2007 Published by Elsevier Inc.
机译：以前的工作[Biagioli，F.，强旋流中湍流预混火焰的稳定机制，燃烧，理论和模型10（3）（2006）389-412; Guethe，F.，Lachner，R.，Schuermans，B.，Biagioli，F.，Geng，W.，Inauen，A.，Schenker，S.，Bombach，R.，Hubschmid，W.，在ALSTOM上进行火焰成像EV-burner：热声脉动和CFD验证，在：2006年1月9日至12日在内华达州里诺举行的第44届AIAA航空科学大会暨展览上提交的AIAA论文2006-437中显示，湍流干燥的低NO当达到整体当量比的临界值（即双稳态）时，高旋流圆锥形燃烧器中的火焰在其对称轴上的锚固位置可能会发生较大变化。这种火焰行为与在大气测试台上为阿尔斯通环境（EV）锥形燃烧器的原型版本测量的燃烧压力动态相关。该链接是通过解决“行进式火焰保持器”的问题而建立的，该问题表明，火焰锚定位置的不稳定位移意味着火焰表面积的不稳定变化，因此热量释放不稳定。这种不稳定的热释放源的相关性与通常的不同，这是由于湍流燃烧速率的变化以及火焰上明显的焓跃变与强烈涡流中燃烧动力学的产生之间的相关性，在此得到了证实。火焰移动趋势与测得的压力脉动幅度之间呈正相关。 （C）2007年由Elsevier Inc.出版

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