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Influence of surface roughness on particle deposition distribution around multi-slot cabin supply air nozzles of commercial airplanes

机译：地表粗糙度对商用飞机多槽舱供应空气喷嘴周围粒子沉积分布的影响

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摘要

Enhanced soiling due to particle deposition is often observed around multi-slot cabin supply air nozzles in commercial airplanes. This study aimed to investigate the influence of surface roughness on the particle deposition distribution around multi-slot cabin supply air nozzles of commercial airplanes. This investigation constructed a half-row cabin mockup installed with three 3D-printed supply air nozzles of a twin-aisle commercial airplane. A cutting method was proposed to measure the detailed particle deposition velocity distribution on the target surface of the nozzles covered by different grades of sandpaper with different roughness heights. This study also conducted numerical calculations for the particle deposition velocity distribution using an Eulerian particle deposition model. Both the experimental and modeling results show that strong particle deposition occurred on the cut samples near the slot dividers. When the surface roughness height was greater than or equal to 6 mu m, the particle deposition velocity increased significantly with the surface roughness height. However, when the surface roughness height was less than or equal to 3 mu m, the particle deposition velocity was relatively insensitive to the surface roughness. The analysis indicated that polishing the surfaces of cabin supply air nozzles may not effectively solve the problem of enhanced soiling in the aircraft cabin.
机译：在商用飞机中的多槽舱供应空气喷嘴周围经常观察到由于颗粒沉积引起的增强的污染。本研究旨在研究地表粗糙度对商用飞机的多槽舱供应空气喷嘴周围的粒子沉积分布的影响。这项调查构建了一艘半排舱样机，安装了三个双相演商业飞机的三个3D印刷供应空气喷嘴。提出了一种切割方法来测量由不同曲面覆盖的喷嘴的靶表面上的详细粒子沉积速度分布，其具有不同的粗糙度高度。该研究还使用欧拉粒子沉积模型对粒子沉积速度分布进行了数值计算。实验和建模结果均表明，在狭槽分隔件附近的切割样品上发生强颗粒沉积。当表面粗糙度高于或等于6μm时，颗粒沉积速度随表面粗糙度高度显着增加。然而，当表面粗糙度高于或等于3μm时，颗粒沉积速度对表面粗糙度相对不敏感。该分析表明，抛光舱口供气喷嘴的表面可能没有有效地解决飞机机舱中污染的问题。

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