The airflow distribution characterised by different large- and small-scale eddies in the aircraft cabin is the most important factor to maintain passengers' thermal comfort and to remove contaminants. The airflow distributions in narrow-body aircraft cabins are based on the principle of mixing ventilation. Opposing jets from air diffusers can cause stream deflection and oscillation, which results in the asymmetry of large-scale instantaneous airflow structures. This dynamic airflow structure is very important for analysing time series parameters. Therefore, this study applied numerical simulation to examine the oscillation and asymmetry of instantaneous airflow field structures and phase space reconstruction and used spectrum analysis to evaluate the oscillation amplitude and period of dynamic airflow structure. We also studied the factors that influence the dynamic airflow structure, such as air supply speeds, air supply angles and the strength of the thermal plume. The results showed that as the air supply speed increased, the swing amplitude of the instantaneous airflow structure increased, while the period decreased. The air supply angle affected the jet attachment and collision angle, which in turn affected the swing amplitude and period. The thermal plume restrained the formation of large-scale swings and contributed to the appearance of small-scale structures.

机舱中不同大小的涡流具有不同的气流分布，这是保持乘客的热舒适性并清除污染物的最重要因素。窄体飞机机舱内的气流分布基于混合通风原理。来自空气扩散器的相反射流会导致气流偏转和振荡，从而导致大型瞬时气流结构的不对称性。这种动态气流结构对于分析时间序列参数非常重要。因此，本研究采用数值模拟方法研究了瞬时气流场结构的振荡和不对称性，并进行了相空间重构，并使用频谱分析法评估了动态气流结构的振荡幅度和周期。我们还研究了影响动态气流结构的因素，例如送风速度，送风角度和热羽流强度。结果表明，随着送风速度的增加，瞬时气流结构的摆幅增大，而周期减小。空气供应角度会影响喷射附件和碰撞角度，进而影响摆动幅度和周期。热羽限制了大型秋千的形成，并有助于小规模结构的出现。空气供应角度会影响喷射附件和碰撞角度，进而影响摆动幅度和周期。热羽限制了大型秋千的形成，并有助于小规模结构的出现。空气供应角度会影响喷射附件和碰撞角度，进而影响摆动幅度和周期。热羽限制了大型秋千的形成，并有助于小规模结构的出现。