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首页> 外文期刊>Combustion Science and Technology >Flame Stability Characteristics of Two-Dimensional Trapped Vortex Combustor
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Flame Stability Characteristics of Two-Dimensional Trapped Vortex Combustor

机译：二维截留式涡流燃烧器的火焰稳定性特征

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摘要

Flame stability characteristics of a two-dimensional (2D) trapped-vortex combustor (TVC) are investigated experimentally by considering two injection strategies, namely: (i) Inj-1 and (ii) Inj-2, for certain operating conditions. Injection strategy 1 (Inj-1) reinforces the shear driven stream-wise vortex flow structure within the cavity, whereas for Inj-2, a counter stream-wise vortex is established within the cavity. The study indicates that for a particular injection strategy, mainstream Reynolds number (Re-ms) and mainstream equivalence ratio (phi(ms)), the cavity fuel-flow rates have to be increased with the primary airflow rate for sustaining cavity flame. Besides this, for the same operating condition, Inj-1 has a wider flame stability limit as compared to that of the Inj-2 case. For the Inj-1 case, fuel-air distribution within the cavity is almost near stoichiometric; however, for the Inj-2 case, the cavity region is found to be fuel lean. Analysis of this result also indicates that cavity equivalence ratio (phi(c)) at the flame blowout condition increases with MFR up to a critical value, beyond which it drops down. This critical MFR value demarcates two physical situations, namely: (i) non-merged and (ii) merged cavity flames. Besides this, an attempt has been made to bring out the phenomenology of flame blowout by analyzing the natural luminosity images near blowout condition. Furthermore, a plausible mechanism for flame blowout is proposed for 2D TVC. A semi-empirical correlation for the flame blowout data in terms of Da and MFR is obtained in this work, which can be useful for the design and development of TVC in the future.
机译：通过考虑两种喷射策略，即（i）Inj-1和（ii）Inj-2，在某些操作条件下，通过实验研究了二维（2D）陷涡燃烧器（TVC）的火焰稳定性。注入策略1（Inj-1）增强了腔体内剪切驱动的流向涡流结构，而对于Inj-2，则在腔内建立了逆流向涡流。研究表明，对于特定的喷射策略，主流雷诺数（Re-ms）和主流等效比（phi（ms）），为了维持型腔火焰，型腔燃料流率必须随主要气流速率增加。除此之外，在相同的工作条件下，与Inj-2情况相比，Inj-1具有更宽的火焰稳定性极限。对于Inj-1情况，型腔内的燃料-空气分配几乎接近化学计量。但是，对于Inj-2情况，发现空腔区域贫油。对这个结果的分析还表明，当MFR达到临界值时，在火焰喷出条件下的腔当量比（phi（c））会增加，超过此临界值就会下降。该临界MFR值划分了两种物理情况，即：（i）非合并和（ii）合并腔火焰。除此之外，还尝试通过分析接近爆燃条件的自然光度图像来找出火焰爆燃的现象。此外，为2D TVC提出了一种合理的火焰喷射机制。在这项工作中，获得了以Da和MFR表示的喷燃数据的半经验相关性，这对将来TVC的设计和开发很有用。

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