论文部分内容阅读
针对采用斜切径向双级旋流器的环形燃烧室单头部矩形模型,利用非接触式测量方法粒子成像测速仪(PIV)测量了主燃区的300K冷态速度场。采用Realizableκ-?湍流模型和稳态层流火焰面燃烧模型对燃烧室的冷流和燃烧流场进行数值模拟,得到燃烧室流场的速度分布和流场结构,并与试验测量数据进行对比验证。结果表明:瞬态流场结构变化剧烈,旋流和主燃射流的边界形成大量小尺度漩涡结构,回流区具有强烈的搅拌作用,回流区下游滞止点位置是随机变化的;反向旋流器比同向旋流器产生的回流区尺寸更小,燃烧状态的回流区尺寸比冷流的小,但主要受火焰筒壁面和主燃射流的约束;外旋流在距离头部5mm距离内控制内旋流,保持旋向相同;燃烧增大主燃射流穿透深度,改变流场的对称性。
A 300K cold velocity field in the main combustion zone was measured by the non-contact measurement method of particle image velocimetry (PIV) for a single head rectangular toroidal combustion chamber model with a chamfered radial two-stage cyclone. Realizable κ-turbulence model and steady-state laminar flame combustion model were used to simulate the flow field and the flow field in the combustion chamber. The velocity distribution and flow field structure of the flow field in the combustion chamber were obtained and compared with the experimental data . The results show that the structure of the transient flow field changes drastically, a large number of small-scale vortex structures are formed on the boundary of the swirl flow and the main jet flow, and the stirring zone has a strong stirring effect. The stagnation point position downstream of the recirculation zone changes randomly. The size of the recirculation zone is smaller than that of the co-cyclone. The size of the recirculation zone in the combustion state is smaller than that of the cold flow. However, the recirculation zone is mainly restrained by the wall of the flame tube and the main jet. Control the internal swirl, keep the same spin; combustion increases the penetration depth of the main jet, changing the symmetry of the flow field.