一种新型旋流燃烧器内甲烷扩散燃烧特性  

Methane Diffusion Combustion Performance in a Novel Cyclonic Combustor

作　　者：孙婷 田力 宋金瓯[2] 祁海鹰[3] 李科[1] Sun Ting;Tian Li;Song Jin’ou;Qi Haiying;Li Ke(School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,China;State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;Key Laboratory for Thermal Science and Power Engineering of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]内蒙古科技大学能源与环境学院,包头014010 [2]天津大学内燃机燃烧学国家重点实验室,天津300072 [3]清华大学热科学与动力工程教育部重点实验室,北京100084

出　　处：《燃烧科学与技术》2018年第6期558-564,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51266008)

摘　　要：采用两步总包反应机理、标准亚网格应力模型与有限速率/涡耗散燃烧模型等对一种新型旋流燃烧器内甲烷-空气扩散燃烧过程进行大涡模拟.凭借旋流离心效应和涡旋效应来控制反应混合和火焰传播特性,实现了一种热流分布均匀、温度波动小的蓝色旋涡状火焰.此外,通过平面激光诱导荧光技术(OH-PLIF)对反应流的OH基分布进行定性测量.研究表明,燃烧核心区与壁面隔离,使得壁面具有自冷却的效应;切向速度沿径向分布呈现中心对称的双峰结构;高速射流经过突扩的喉部强烈吸卷周围的气流,对其起到预热作用,有利于燃料空气的混合和燃烧效率的提高.A new methane-air diffusion combustion process in a swirl combustor was simulated via a two-step overall package reaction mechanism,using the Lilly sub-grid stress and finite-rate/eddy-dissipation combustion models.Reaction mixing and flame propagation were controlled by the centrifugal and vortex effects of swirling flow.The results showed that a blue swirl flame with uniform heat flow distribution and low temperature fluctuation occurred.Furthermore,the OH distribution of the reaction flow was qualitatively measured using planar laserinduced fluorescence(OH-PLIF).The results suggest that the combustion core area was isolated from the wall,which induces a self-cooling effect in the wall.The radial distribution of tangential velocity presents a centrosymmetric double-peak structure.The methane-air mixture was sucked around the sudden expansion of the throat due to high-speed jet flows,which is beneficial to both the preheating and mixing of fuel-air and the improvement of combustion efficiency.

关 键 词：旋流燃烧器 大涡模拟 自冷却 蓝色火焰 

分 类 号：TK16[动力工程及工程热物理—热能工程] TK402