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Premixed jet flame behavior in a hot vitiated crossflow of lean combustion products

机译：稀薄燃烧产物的热通风横流中的预混喷射火焰行为

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Improvement in NOx, emissions from gas turbine combustors requires development of safe and reliable lean-premixed combustion systems. In this paper, the flame stabilization behavior of a premixed ethylene-air jet injected normal to a hot vitiated crossflow (JICF) of lean combustion products was studied experimentally. The equivalence ratio of the premixed jet was varied from lean to rich conditions. Measurements of the flame were conducted using high-speed chemiluminescence imaging and simultaneous particle image velocimetry (PIV), hydroxyl (OH) and formaldehyde (CH2O) planar laser-induced fluorescence (PLIF). From the PLIF measurements, pixel-by-pixel multiplication of OH and CH2O fluorescence signals was conducted to estimate the heat release zone of the JICF flame front. The unsteady windward flame exhibited both attached and lifted flame behavior, while the leeward flame branch remained consistently attached to the jet exit. When the windward flame was lifted, chemiluminescence imaging showed that both flame propagation and auto-ignition kernel formation contributed to flame anchoring. From the PLIF imaging, formaldehyde signal was observed upstream of the lifted windward flame base, suggesting pre-ignition behavior due to mixing between the jet reactants and the hot cross flow. The windward flame base was always in the jet shear layer and the trailing flame remained in the shear layer under lean conditions but traversed the shear layer into the bulk jet flow for stoichiometric and rich conditions. Alignment between 2D dilatation and heat release was seen to vary depending on the location of the flame relative to the shear layer. Two-dimensional dilatation and heat release location aligned best when the flame resided away from the shear layer, where jet and crossflow mixing and out-of-plane motion are minimal. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：燃气轮机燃烧器中NOx排放的改善要求开发安全可靠的稀薄预混燃烧系统。在本文中，实验研究了预混合乙烯空气射流的喷射稳定性，该射流垂直于稀薄燃烧产物的热通风横流（JICF）。预混合射流的当量比从稀薄条件变化到浓淡条件。使用高速化学发光成像和同步粒子图像测速（PIV），羟基（OH）和甲醛（CH2O）平面激光诱导荧光（PLIF）进行火焰测量。从PLIF测量中，进行了OH和CH2O荧光信号的逐像素乘法运算，以估计JICF火焰前沿的放热区域。不稳定的迎风火焰同时表现出附着和升起的火焰行为，而下风向火焰分支则始终保持附着在喷口上。当迎风火焰抬起时，化学发光成像显示火焰传播和自燃核形成均有助于火焰锚定。从PLIF成像中，在抬起的迎风火焰底座上游观察到甲醛信号，这表明由于喷射反应物和热横流之间的混合而导致了提前点火行为。在稀薄条件下，迎风火焰基部始终位于射流剪切层中，而尾随火焰保留在剪切层中，但在化学计量和浓状态下，横穿剪切层进入整体射流。可以看到2D膨胀和放热之间的对准根据火焰相对于剪切层的位置而变化。当火焰远离剪切层时，二维的膨胀和放热位置对齐得最好，在剪切层中，射流和横流混合以及平面外运动最小。 （C）2016年燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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