氧化锆基涂层壁面改善火焰稳定性研究  

Study on enhancing flame stability using zirconia-based coating walls

作　　者：李凡 姜奥林 杨浩林[1] 曾小军[1] 蒋利桥[1] 汪小憨[1] LI Fan;JIANG Aolin;YANG Haolin;ZENG Xiaojun;JIANG Liqiao;WANG Xiaohan(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;Funan Commercial Grain Bureau,Fuyang 236300,Anhui,China)

机构地区：[1]中国科学院广州能源研究所,广东广州510640 [2]阜南县商务粮食局,安徽阜阳236300

出　　处：《化工学报》2021年第11期5883-5892,共10页CIESC Journal

基　　金：广州市科技计划项目(201903010019);广东省重点领域研发计划项目(2020B1111360004)。

摘　　要：从调控燃烧室壁面热和化学性能角度出发,利用大气等离子喷涂技术制备了ZrO_(2)和ZrO_(2)+Al_(2)O_(3)两种陶瓷涂层壁面,并结合OH平面激光诱导荧光(OH-PLIF)技术研究了涂层材料对平板通道内甲烷/空气预混火焰特性的影响。涂层材料表征结果显示,高温热喷涂能使混合材料内部形成部分Zr-Al固溶体,表面分布的晶格氧含量明显增加。ZrO_(2)基混合材料热导率的增加也会增强流向导热作用。狭缝燃烧实验证实相比使用纯ZrO_(2)涂层,混合一定量Al_(2)O_(3)在不同壁温、当量比条件下均能有效降低火焰淬熄间距,表现出更好的燃烧稳定性。特别是随着壁温升高、通道间距缩小,ZrO_(2)+Al_(2)O_(3)近壁面区域以及火焰核心区OH基浓度均显著提高。From the perspective of controlling the thermal and chemical properties of the combustion chamber wall,this paper uses atmospheric plasma spraying technology to prepare two ceramic coating walls,ZrO_(2)and ZrO_(2)+Al_(2)O_(3),and studies coating material effects on the flame characteristic of methane/air mixtures in a narrow channel based on the planar laser induced fluorescence technique.Coating characterization shows that thermal spraying treatment can realize partial Al-Zr solid solution,and increases the oxygen content distributed on the surfaces.Mixing Al_(2)O_(3)also renders a larger thermal conductivity of the coating wall and then enhances streamwise heat conduction.Finally,slot combustion tests confirm that using ZrO_(2)+Al_(2)O_(3)coating wall can effectively reduce the quenching distance and show a better flame stability under various wall temperatures and equivalence ratios rather than pure ZrO_(2)case.In particular,as the wall temperature increases and channel spacing decreases,the OH radical concentration in the close vicinity of ZrO_(2)+Al_(2)O_(3)coating wall and in flame core areas are both elevated significantly.

关 键 词：氧化锆+氧化铝涂层 OH-PLIF 晶格氧 淬熄间距 强化稳燃 

分 类 号：TK16[动力工程及工程热物理—热能工程]