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CH_(4)/O_(2)反扩散撞击火焰稳定性及光谱辐射特性研究

Study on Stability and Spectral Radiation Characteristics of CH_(4)/O_(2) Inverse Diffusion Impinging Flame
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摘要 反扩散火焰是射流扩散火焰中一种重要形式之一,燃烧火焰形成的化学自由基所释放的化学发光被应用于多个领域。基于光谱辐射诊断技术对CH_(4)/O_(2)反扩散撞击火焰进行研究,探究了不同撞击距离(H)对火焰稳定性及光谱辐射特性的影响,利用OH^(*)对火焰形态及结构进行表征。结果表明:存在阻流体时的举升高度相较于没有阻流体更高,且随着H的减小而增大。在吹熄方面,存在阻流体时火焰吹熄极限更大,并且吹熄极限与H呈负相关。然而火焰的举升极限与H的大小并不存在相关性。火焰光谱辐射特性表明:OH^(*)辐射强度随H的减小逐渐减弱,随氧气流速(u_(O_(2)))的增加也逐渐减弱。然而,在H为10 mm时,举升火焰的OH^(*)辐射强度随u_(O_(2))的增加逐渐增强。同时,沿着火焰传播方向火焰的峰值位置随着H的减小而逐渐远离喷嘴。火焰处于举升状态的OH^(*)辐射强度整体大于附着状态,但H对峰值强度的影响不是很大。另外,当H为10 mm时,火焰的核心区与撞击区相互重合。H大于10 mm的火焰,在撞击区域附近的火焰均存在一个OH^(*)辐射峰,且随着H的减小,撞击区的辐射强度逐渐增大。 Inverse diffusion flame is one of the most important forms of jet diffusion flame.The chemiluminescence released by chemical radicals from combustion flame is applied in a variety of field.Based on the spectral radiation diagnostic technology,the CH_(4)/O_(2) inverse diffusion impinging flame was studied,and the influence of different impinging distances(H)on flame stability and spectral radiation characteristics was explored.The shape and structure of flame were characterized by OH^(*).It is found that the liftoff height of the flame was higher when the bluff body existed.With the decrease of H,the liftoff height of the flame gradually increased.In terms of blowout,the blowout limit of the flame became larger with the bluff body,and the blowout limit was negatively correlated with H.While,the liftoff limit of the flame was unrelated to the impinging distances.The flame spectral radiation characteristics show that the OH^(*)radiation intensity gradually decreased with the decrease of H,and also gradually decreased with the increased of u_(O_(2)).When H was 10 mm,the OH^(*)radiation intensity of the liftoff flame gradually increased with the increase of u_(O_(2)).At the same time,the peak position of the flame gradually keep away from the nozzle with the decrease of H.The OH^(*)radiation intensity of the liftoff flame was greater than attachment state,while,the influence of H on the peak intensity was not evident.In addition.When H was 10 mm,the core area of the flame and the impinging area overlapped.When the H was higher than 10 mm,there was an OH^(*)radiation peak near the impinging area.With the decrease of H,the radiation intensity in the impinging area gradually increased.
作者 石美玉 吴润民 宋旭东 苏暐光 于广锁 SHI Meiyu;WU Runmin;SONG Xudong;SU Weiguang;YU Guangsuo(State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,School of Chemistry and Chemical Engineering,Ningxia University,Yinchuan,Ningxia 750021,China;Institute of Clean Coal Technology,East China University of Science and Technology,Shanghai 200237,China)
出处 《工程热物理学报》 EI CAS CSCD 北大核心 2022年第11期3093-3102,共10页 Journal of Engineering Thermophysics
基金 国家自然科学基金(No.22108132) 宁夏重点研发计划(No.2019BCH01001) 宁夏自然科学基金(No.2021AAC03076)。
关键词 反扩散撞击火焰 撞击距离 OH^(*)光谱辐射特性 稳定性 光谱诊断 Inverse diffusion impinging flame impinging distance OH^(*) spectral radiation characteristics stability spectral diagnosis
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