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The influence of yaw on the unsteady surface pressures over a two-wheeled landing-gear model
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering ( IF 1.1 ) Pub Date : 2020-09-21 , DOI: 10.1177/0954410020959881
WR Graham 1 , A Gatto 2
Affiliation  

Landing-gear noise is an increasing issue for transport aircraft. A key determinant of the phenomenon is the surface pressure field. Previous studies have described this field when the oncoming flow is perfectly aligned with the gear. In practice, the frequent presence of large-scale wind variations introduces the possibility of a quasi-steady cross-flow component; here its influence is investigated experimentally for a generic, two-wheel, landing-gear model. It is found that yaw angles as small as 5{\deg} cause significant changes in both overall flow topology and unsteady surface pressures. Most notably, on the outboard face of the leeward wheel, large-scale separation replaces predominantly attached flow behind a leading-edge separation bubble. The effect on unsteady surface pressures includes marked shifts in the content at audible frequencies, implying that yaw is an important parameter for landing-gear noise, and that purely unyawed studies may not be fully representative of the problem.

中文翻译:

偏航对两轮起落架模型非定常表面压力的影响

起落架噪音是运输飞机日益严重的问题。该现象的一个关键决定因素是表面压力场​​。以前的研究描述了当迎面而来的流动与齿轮完美对齐时的这一领域。在实践中,大尺度风变的频繁出现引入了准稳态横流分量的可能性;在这里,它对通用的两轮起落架模型的影响进行了实验研究。发现小至 5{\deg} 的偏航角会导致整体流动拓扑和不稳定表面压力发生显着变化。最值得注意的是,在背风轮的外侧面上,大规模分离取代了前缘分离气泡后面的主要附着流。对不稳定表面压力的影响包括内容在可听频率的显着变化,
更新日期:2020-09-21
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