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Effect of preheated fuel supply by gas reflux on thermodynamic characteristics in a cavity-based integrated combustor

机译：气体回流预热燃料供应对基于腔体集成燃烧器热力学特性的影响

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摘要

For achieving higher combustion performance under the premise of reliable ignition and flame stability, a novel preheated fuel supply method, which consists of the air-entraining parts and evaporation chamber designs, is proposed for the cavity-based integrated combustor. Herein, comparison experiments are conducted under ambient pressure to investigate the discrepancies in terms of lean ignition, blowout, and combustion characteristics accompanied by numerical flow fields. Furthermore, the time-averaged CH* intensity and local equivalence ratio of flame are acquired using a colorful CCD camera and processed via an image-processing algorithm based on probability density function. The results indicate that the novel preheated fuel supply method can widen the maximum Ma number for successful pilot-ignition, and decrease the lean ignition and blowout fuel/air ratio by 42.2% and 45.4% at low inlet temperature, respectively. The CH* intensity within the cavity in the Novel layout is much higher than that in the Original layout, due to the higher equivalence ratio accumulated by the larger recirculation zone. The flame structure in the mainstream is determined by the contest between jet penetration momentum and entrainment of wake-region. Moreover, the altered temperature distribution in Novel layout is more suitable for engineering combustors with higher requirements on circumferential flame propagation. (C) 2020 Elsevier Masson SAS. All rights reserved.
机译：为了实现更高的燃烧性能，在可靠点火和火焰稳定性的前提下，提出了一种由空气夹带部件和蒸发室设计组成的新型预热燃料供应方法，用于基于腔的集成燃烧器。这里，在环境压力下进行比较实验，以研究贫射点火，井喷和燃烧特性的差异，伴随着数值流场。此外，使用彩色CCD相机获取的时间平均CH *强度和局部等效比率，并通过基于概率密度函数的图像处理算法进行处理。结果表明，新型预热燃料供应方法可以扩大成功先导 - 点火的最大MA号，分别在低入口温度下降低42.2％和45.4％的贫射点和井喷燃料/空气比。由于较大的再循环区累积的较高的等效比，新颖布局内的腔内内的CH *强度远高于原始布局中的腔。主流中的火焰结构由喷射渗透动量和唤醒区域之间的竞争决定。此外，新颖布局中的温度分布改变更适合于在周向火焰传播上具有更高要求的工程燃烧器。 （c）2020 Elsevier Masson SAS。版权所有。

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