声场扰动下预混旋流管状火焰动态响应特性

余筱; 赵晓尧; 马康

doi:10.13224/j.cnki.jasp.2020.08.010

声场扰动下预混旋流管状火焰动态响应特性

doi: 10.13224/j.cnki.jasp.2020.08.010

基金项目: 国家自然科学基金重大研究计划重点项目（91641204）; 国家自然科学基金（51676016）

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出版历程
- 收稿日期: 2020-01-23
- 刊出日期: 2020-08-28

Characteristics of premixed swirling tubular flame under acoustics perturbation,

1.
School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China
2.
Research Institute of Collaborative Innovation of Military-Civilian Integration,North University of China,Taiyuan 030051,China

摘要

摘要: 针对预混旋流管状火焰不稳定问题,开展不同空气体积流量和当量比甲烷/空气火焰对轴向声场扰动响应特性的实验研究,揭示了火焰对不同声场频率的动态响应范围,获得了声场扰动下火焰结构、声压、OH*等的变化规律。结果表明:火焰对声场的响应呈现低通滤波特性,高频声场对火焰影响较弱,中、低频声场迫使火焰发生同频振荡,甚至引发熄火现象。通过调整入口体积流量发现低通滤波特性的特征频率和低频熄火频率受混合燃气的体积流量及当量比的影响较小。熄火拉伸率计算表明:相对于高当量比火焰,当量比小于等于065时火焰抗熄火能力较弱,在中频声场扰动下火焰局部熄火致使火焰抬升。
- 旋流燃烧 /
- 管状火焰 /
- 声场扰动 /
- 热声共振 /
- 火焰结构
Abstract: To investigate the combustion instability of the premixed swirling tubular flame, the responses characteristics of methane/air premixed flames to longitudinal acoustic field was experimentally studied with different air volume flow rates and methane equivalent ratios. The dynamic response range of flame to different acoustic frequencies was revealed,and the variation of flame structure,acoustic pressure and OH* fluctuations under acoustics perturbation were studied. The results showed that the flame presented the low-pass filtering characteristic, demonstrating very weak response to the high acoustic frequency. For middle and low acoustic frequency, the flame was forced to oscillate at the same frequency, and even quenched at a lower acoustic frequency. In addition, the low-pass filtering behaviors were slightly affected by the flow rate and equivalent ratio. According to the calculated extinction strain rate, near lean extinction limit (eg, equivalence ratio equaling to 065), the flame was much sensitive to middle acoustic frequency owing to low extinction strain rate, generally presenting flame lift-off.
- swirl combustion /
- tubular flame /
- acoustics perturbation /
- ,thermoacoustic oscillation /
- flame structure

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