Planar laser-induced incandescence for the study of soot production in a multi-sector RQL Jet A combustor

Russell McGrath , Jeremiah Juergensmeyer , Robert Bond , Ezekiel Bugay , Shawn Wehe , David Wu , Adam Steinberg , Wenting Sun , Yi Chen Mazumdar
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Abstract

Understanding the production of non-volatile particulate matter (nvPM), which is composed primarily of soot, is critical not only for reducing emissions but also for improving engine performance. While there has been significant prior work studying the fundamentals of soot formation, there is significantly less work that investigates soot formation with realistic aeroengine geometries, injectors, and fuels in high pressure conditions. In this work, soot production in a three-sector rich-quench-lean (RQL) aeroengine combustor is studied with Jet A fuel. Global equivalence ratios ranging of 0.10 to 0.20 and pressures ranging from 2.7 to 6.9 bar absolute (40 to 100 psia) are tested. In order to characterize in-situ soot production near the fuel injectors, two-dimensional laser-induced incandescence is utilized to estimate single-shot and average soot volume fractions. Time-resolved laser-induced incandescence is then used to create single camera and single laser-shot incandescence decay time images in order to infer how soot particle sizes evolve. Results show a significant increase in soot production at higher global equivalence ratios and higher pressures. Incandescence decay times, however, do not change significantly over the same range of conditions. These measurements can not only help understand soot distributions in practical RQL systems but also help improve future aeroengine combustor designs.

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平面激光诱导炽热,用于研究多扇区 RQL Jet A 燃烧器中的烟尘产生情况
了解主要由烟尘组成的非挥发性颗粒物 (nvPM) 的产生不仅对减少排放至关重要,而且对提高发动机性能也至关重要。虽然之前已有大量研究煤烟形成基本原理的工作,但研究在高压条件下使用实际航空发动机几何形状、喷油器和燃料形成煤烟的工作却少得多。在这项工作中,研究了使用喷气 A 燃料的三扇区富淬冷(RQL)航空发动机燃烧器中的烟尘生成情况。测试了 0.10 至 0.20 的全局当量比和 2.7 至 6.9 巴的绝对压力(40 至 100 psia)。为了确定燃料喷射器附近原位烟尘产生的特征,利用二维激光诱导炽热来估算单次和平均烟尘体积分数。然后利用时间分辨激光诱导炽热成像技术创建单相机和单激光照射炽热衰减时间图像,以推断烟尘颗粒大小的演变过程。结果表明,在较高的全局当量比和较高的压力下,烟尘的产生量明显增加。然而,在相同的条件范围内,炽热衰减时间并没有显著变化。这些测量结果不仅有助于了解实际 RQL 系统中的烟尘分布,还有助于改进未来的航空发动机燃烧器设计。
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