进气装置对燃烧室内流场的影响研究

Influence Research of Air Inlet Unit of Combustor

针对采用双轴向旋流器的单头部矩形燃烧室模型,利用粒子图像测速仪(PIV)技术测量了常温常压状态旋流器下游速度场,分析PIV瞬态结果,研究了上下射流之间的相互作用对流场的影响。结果表明,速度场变化剧烈,上下射流的相互作用影响回流区和二次区的形成,回流区和二次区涡的运动有明显的三维特征;同向旋流器下游速度场对称性好,回流区轴向延伸更大,主燃射流倾角更大;而反向旋流器下游掺混射流速度较大,射流穿透性更强。

For a single-dome annular combustor rectangular model with dual-swirler, including two co-axis axial air swirlers, the velocity field in primary zone was measured with Particle Image Velocimetry （PIV） in isothermal condition. The results indicate that instantaneous flow-field changes rapidly. The interaction between primary jets influenced recirculation zone. The movement of center recirculation zone was three dimensional. Better symmetry properties, longer axial length of center recirculation zone, and greater dip angle of primary jet were found in co-swirl downstream, Ihigher speed and stronger penetrability of dilution jet in counter-swirl downstream.