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为了揭示90°弯曲管道结构对预混火焰传播特性的影响,以丙烷-空气预混火焰为研究对象,运用高速纹影摄像、微细热电偶以及离子探针等测试手段对火焰在90°弯曲管道内的传播过程进行了实验研究.结果表明,预混火焰结构在水平管道内发生了明显变化,由规则的球形层流火焰转变为具有轴对称结构向内凹陷的湍流火焰,并伴随火焰阵面的皱褶分层.火焰进入90°弯曲管道后,受几何形状影响,火焰阵面发生畸变,对称结构被破坏,下壁面处的火焰阵面逐渐超过上壁面处的火焰阵面.由于弯管内部多波叠加作用以及湍流的影响最终使得火焰速度呈现脉动振荡.
In order to reveal the influence of 90 ° curved pipe structure on the propagation characteristics of premixed flame, a propane-air premixed flame was used as the research object. By using high-speed schlieren photography, micro thermocouple and ion probe, The experimental results show that the pre-mixed flame structure changes obviously in the horizontal pipe and changes from a regular spherical laminar flame to an inwardly turbulent flame with axisymmetric structure, Of the corrugated stratification.Flame into the 90 ° curved pipe, the geometry of the impact, the flame front distortion, the symmetrical structure is destroyed, the lower wall of the flame front gradually surpass the upper wall of the flame front.As the elbow The effects of internal multi-wave superposition and turbulence eventually lead to pulsating oscillations in flame velocity.