燃烧和反应

Mechanistic Insights into Effects of Outer Stage Flare Angle on Ignition and Flame Propagation of Separated Dual-Swirl Spray Flames

  • YANG Siheng ,
  • HUI Xin ,
  • ZHANG Chi ,
  • QIAN Weijia ,
  • GAN Xiaohua
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  • 1. National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, School of Energy and Power Engineering, Beihang University, Beijing 102206, China
    2. Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518000, China

网络出版日期: 2023-12-01

基金资助

This work was supported by National Natural Science Foundation of China (Grant No. 91641109) and National Science and Technology Major Project (2017-III-0004-0028).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Mechanistic Insights into Effects of Outer Stage Flare Angle on Ignition and Flame Propagation of Separated Dual-Swirl Spray Flames

  • YANG Siheng ,
  • HUI Xin ,
  • ZHANG Chi ,
  • QIAN Weijia ,
  • GAN Xiaohua
Expand
  • 1. National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, School of Energy and Power Engineering, Beihang University, Beijing 102206, China
    2. Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518000, China

Online published: 2023-12-01

Supported by

This work was supported by National Natural Science Foundation of China (Grant No. 91641109) and National Science and Technology Major Project (2017-III-0004-0028).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

本文针对中心分级光学模型燃烧室,基于火核动力学分析和流动液雾场的激光诊断测试方法研究了外层主燃级翻边角对点火和火核传播的影响。分别针对3种外层主燃级翻边角度8°、16°和25°进行了研究。研究发现,更大的外级翻边角获得更好的点火性能。从6 kHz高速火焰图像中提取了火核速度、火核轨迹等关键参数,并结合通过粒子图像测速(PIV)和平面米氏散射(PMie)测试获得的流场和喷雾进行耦合分析。结果表明,大的外级翻边角诱导了更大的外层旋转射流(SWJ)张角,使得外回流区(ORZ)的涡和内回流区(IRZ)的涡往上游移动。小翻边角下的喷雾分布在点火器附件出现了贫燃料区,这归因于小张角的外层旋流射流的存在阻止了燃油液滴到达点火器附近。沿着火核传播路径,应变率和流动速度降低且液雾浓度在可燃范围内。较低的外级翻边角会增加火核传播早期的应变率和流动速度,导致更长的火核传播路径,从而增加点火失败的风险。

本文引用格式

YANG Siheng , HUI Xin , ZHANG Chi , QIAN Weijia , GAN Xiaohua . Mechanistic Insights into Effects of Outer Stage Flare Angle on Ignition and Flame Propagation of Separated Dual-Swirl Spray Flames[J]. 热科学学报, 2022 , 31(5) : 1642 -1662 . DOI: 10.1007/s11630-022-1656-z

Abstract

The present work investigates the effects of outer stage flare angle on ignition and kernel propagation in a centrally staged optical model combustor based on the kernel dynamics analysis and laser diagnostics of flow and spray fields. Three outer stage flare angles of 8°, 16°, and 25° are researched, respectively. The better ignition performances are found for larger outer stage flare angles. Key properties such as the kernel velocity, kernel trajectory extracted from 6 kHz high-speed flame images are analyzed in combination with the flow and spray measured via Particle Image Velocimetry (PIV) and Planar Mie Scattering (PMie). Results show that the larger outer stage flare angle imposes a larger opening angle of outer swirl jet (SWJ), shifting the vortex in outer recirculation zone (ORZ) and inner recirculation zone (IRZ) upstream. The spray distribution of a smaller flare angle exhibits a fuel-lean zone near the igniter and this is attributed to the presence of low-angle outer swirl jet that prevents the fuel droplets from arriving at the igniter vicinity. The flame kernel propagates along the path where the strain rate and velocity decrease and the spray droplet density is within the flammable limits. A lower outer stage flare angle increases the strain rate and velocity at the early phase of flame propagation, leading to a longer propagation route and thus increasing the risk of ignition failure.

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