一级旋流偏置对双旋流杯下游流场的影响

双旋流杯具有良好的综合燃烧性能,在航空发动机燃烧室中已获得广泛应用。但其在装配过程中不可避免地会出现细微的安装误差,为了研究这些细微误差是否会对燃烧性能产生影响,需要更细致地研究双旋流杯局部结构和气动特征对下游流场的影响作用。因此,本文在常温常压条件下采用粒子图像测速(PIV)技术测试了双旋流杯下游冷态流场,探究一级旋流偏置对反向双旋流杯下游流场的影响规律。结果表明,随着一级旋流偏置距离的增加,在无量纲偏置量下游流场无变化,而当继续增加一级旋流的偏置距离时,下游流场会出现明显的偏移,这对旋流器的安装调试提供了参考。

Influence of primary swirl offset on downstream flowfield of dual-swirl cup

Dual-swirl cup has been widely used in aero-engine combustor because of excellent comprehensive combustion performance. But it is inevitable that there will be slight misalignment during its assembly, and in order to examine whether these subtle errors will affect combustion performance, more detailed study of the effect of local structure and aerodynamic characteristics on the downstream flow field in a double swirl cup is required. Therefore, we tested downstream cold flow field of the dual-swirl cup using particle image velocimetry (PIV) technology under normal temperature and pressure conditions to explore the impact law of the offset distance of the primary swirl on downstream flow field of the reverse double swirl cup. The results show that with the increase of the offset distance, in a small non dimensional offset area, downstream flow field does not change, and when the offset distance continues to increase, downstream flow field will apparently shift with excellent symmetry, which provides a reference for swirl cup installation.