火焰曲率对H_2扩散火焰NO排放影响的数值研究  

Flame Curvature Effect on NO Emission of the Hydrogen Diffusion Flame

作　　者：李琼[1] 王培勇[2,3] 邢菲[4] 邹建锋[4] 

机构地区：[1]华侨大学机电及自动化学院,福建厦门361021 [2]厦门大学航空系,福建厦门361005 [3]Department of Mechanical Engineering,Vanderbilt University,nashvilleusa37235 [4]浙江大学航空航天学院,浙江杭州310027

出　　处：《工程热物理学报》2011年第11期1949-1952,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.10702064);中央高校基本科研业务费专项资金资助项目(No.2010121045)

摘　　要：使用不同的H_2/O_2化学反应机理和NO_x化学反应机理模拟了平面对冲火焰。通过和实验数据比较确定了最优的化学反应机理。使用该化学反应机理模拟了管形对冲火焰。通过对比平面拉伸火焰和管形拉伸火焰,突出了火焰曲率对H_2扩散火焰温度和NO排放的影响。分析显示正曲率提高火焰温度,负曲率降低火焰温度,由于NO生成对温度的敏感性,正曲率火焰的NO排放明显高于平面火焰,反之,负曲率火焰的NO排放大大低于平面火焰。The opposed jet H2 diffusion flames are simulated with OPPDIF code and different H2/O2 and NOx mechanisms. The simulations with 2004 UCSD NOx mechanism and 2005 UCSD H2/O2 mechanism are identified to have the best agreement with the experimental flame temperature and NO emission. With those mechanisms, the tubular H2 diffusion flames are simulated with modified OPPDIF code and compared with the plane opposed jet flames. The comparison result shows that the positive flame curvature enhances the preferential diffusion of H2 and increases the flame temperature and NO emission; and vice versa for the negative curvature. The flame curvature can change the NO emission 6 times for the tested H2 diffusion flames with constant stretch rate 100 s-1.

关 键 词：平面对冲火焰 管形对冲火焰 火焰曲率 NO排放 差别扩散 

分 类 号：TK16[动力工程及工程热物理—热能工程]