As an important means of transportation, an aircraft’s environmental control system plays an important role in ensuring the health and thermal comfort of the cabin environment. To guarantee sufficient lift during flight, the aircraft cabin needs to have a certain angle of attack with the horizontal direction. In this study, the flow field, temperature field and vortex structure characteristics of the cabin were analysed using a scaled 28-row cabin model and computational fluid dynamics (CFD) under different angles of attack (15° and 8°) conditions. The results show that the velocity and temperature in the local area in the longitudinal section were increased when the angle of attack was increased. Compared with the horizontal state (angle of attack 0°), the longitudinal airflow under the condition of a larger angle of attack was enhanced. The overall trend of forward airflow is presented in this paper. The longitudinal airflow would strengthen the separation of the large vortex at the top of the cabin. The vortex structure shows high instability in different times and spaces.

中文翻译：

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基于迎角的飞机机舱内纵向气流特性研究

飞机作为重要的交通工具，其环境控制系统对于保证客舱环境的健康和热舒适性发挥着重要作用。为了保证飞行时有足够的升力，飞机机舱需要与水平方向有一定的迎角。本研究利用缩比28排舱模型和不同攻角（15°和8°）条件下的计算流体动力学（CFD）分析了舱的流场、温度场和涡结构特征。结果表明，当攻角增大时，纵截面局部区域的速度和温度均增大。与水平状态（攻角0°）相比，较大攻角条件下的纵向气流增强。本文介绍了前向气流的总体趋势。纵向气流会加强舱顶大涡流的分离。涡旋结构在不同时间和空间表现出高度的不稳定性。