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为了研究丙烷/空气贫油直接喷射燃烧室的燃烧特性,设计了两种轴向旋流器和一种均布直射式丙烷喷注结构,建立了丙烷/空气贫油直接喷射燃烧平台,改变轴向旋流器叶片安装角和丙烷喷注结构位置,探讨轴向旋流器结构、旋流器和喷注结构匹配等因素对丙烷/空气贫油直接喷射燃烧特性影响及变化规律。研究结果表明:(1)60°叶片安装角旋流器结构,在相同进气条件下压力损失更大,有效面积更小;(2)随着丙烷喷注结构端面与文氏管出口距离的增加,45°安装角对应的旋流器结构的燃烧室总压损失减小,有效面积增加,而60°安装角对应的旋流器结构的燃烧室总压损失和有效面积均不呈现单调变化趋势,存在最优位置;(3)45°叶片安装角旋流器结构的燃烧温度高于60°叶片安装角旋流器结构;(4)相同条件下,60°叶片安装角旋流器结构的点火当量比低于45°叶片安装角旋流器结构,45°叶片安装角旋流器结构的点火当量比可达到0.7,60°结构所对应的最低当量比则为0.6。
In order to study the combustion characteristics of a propane / air lean direct injection combustor, two axial cyclones and a homogeneous direct injection propane injection structure were designed. A propane / air lean direct injection combustion platform was established to change the axial The influences of axial hydrocyclone structure, matching of swirler and injection structure on the direct injection combustion characteristics of propane / air lean oil and its variation were discussed. The results show that: (1) The structure of the 60 ° blade-mounted cyclone has a larger pressure loss and a smaller effective area under the same conditions of intake; (2) With the distance between the end face of the propane injection structure and the outlet of the venturi The total pressure loss of the combustion chamber of the cyclone structure corresponding to the installation angle of 45 ° decreases and the effective area increases while the total pressure loss and the effective area of the combustion chamber of the cyclone structure corresponding to the installation angle of 60 ° do not monotonically change (3) 45 ° blade mounting angle swirler structure of the combustion temperature is higher than 60 ° blade mounting angle cyclone structure; (4) under the same conditions, 60 ° blade mounting angle cyclone structure Ignition equivalence ratio is less than 45 ° blade mounting angle cyclone structure, 45 ° blade mounting angle cyclone structure ignition equivalence ratio can reach 0.7, 60 ° structure corresponding to the minimum equivalent ratio is 0.6.