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氢燃烧室边界层回火机制和预测方法

张晓旭1,肖为2,曹俊2,李维3,周华1,任祝寅4   

  1. 1. 清华大学航空发动机研究院
    2. 中国航发湖南动力机械研究所
    3. 株洲航空动力研究所
    4. 清华大学
  • 收稿日期:2024-07-17 修回日期:2024-09-26 出版日期:2024-09-29 发布日期:2024-09-29
  • 通讯作者: 周华
  • 基金资助:
    MJ专项;航发集团产学研

The mechanism and prediction model of boundary layer flashback in hydrogen-fueled combustor

  • Received:2024-07-17 Revised:2024-09-26 Online:2024-09-29 Published:2024-09-29

摘要: “双碳”背景下,氢气作为一种零碳清洁燃料,得到了航空业的广泛关注。相比于航空煤油,氢气具有更高的火焰传播速度、更薄的火焰厚度,增大了氢燃烧室发生回火的风险。目前广泛使用的微预混燃烧技术虽然可以有效降低核心流回火风险,但是边界层回火的风险依然存在。如何在设计阶段准确预测边界层回火,进而在运行阶段规避喷嘴回火风险,是研制氢燃料燃烧室面临的关键技术挑战。本文针对氢燃烧边界层回火问题,分析了氢燃料分子输运、火焰传播特性对于边界层回火的影响,综述了针对无旋边界层回火和旋流边界层回火的实验测量和数值仿真发现,梳理了近几十年来发展的层流和湍流边界层回火判据,介绍了近期发展的快速边界层回火预测方法,讨论了氢燃料边界层回火研究面临的挑战,展望了氢燃料边界层回火判据与建模的发展趋势。

关键词: 氢燃烧, 边界层回火, 差异扩散, 回火机制, 回火判据

Abstract: In the pursuit of a carbon-neutral society, hydrogen, as a zero-carbon fuel, has gained significant attention in the aviation propulsion systems. Hydrogen has a higher flame propagation speed and a thinner flame thickness, which increases the risk of flashback in the design and operation of hydrogen-fueled combustor. The widely used micro-mixer nozzle effectively prevents core flow flashback by increasing axial velocity. However, the boundary layer flashback remains a challenging issue in hydrogen-fueled combustor. This paper investigates the boundary layer flashback of hydrogen-fueled combustor, examining the flame propagation characteristics and unique molecular transport properties of hydrogen. It reviews experimental and numerical simulations for non-swirling and swirling boundary layer flashback, summarizes classical critical velocity gradient theory for boundary layer flashback, and outlines laminar and turbulent boundary layer flashback criteria developed over recent decades. Finally, this work introduces fast flashback prediction method, discusses the current challenges in boundary layer flashback research in hydrogen-fueled combustor, and outlooks the future development of boundary layer flashback for premixed hy-drogen flames.

Key words: Hydrogen combustion, boundary layer flashback, differential diffusion, flashback mechanism, flashback criteria

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