Control of a swept-wing boundary layer perturbed by free-stre am turbulence

受自由流湍流扰动的后掠翼边界层的控制

• 批准号: EP/I033173/1
• 负责人: Pierre Ricco
• 金额: $ 12.72万
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2011
• 资助国家: 英国
• 起止时间: 2011 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FI033173%2F1
• 关键词: Control; swept; wing; boundary; layer

Wall suction has been used extensively to reduce the growth of laminar boundary layer disturbances, such as Tollmien-Schlichting waves, cross-flow vortices and, more recently, Klebanoff modes, namely unsteady streamwise-elongated low-frequency disturbances generated by free-stream vortical perturbations. Wall suction has resulted in a delay of transition to turbulence with major benefits, such as reduction of viscous drag, noise, and fuel consumption.The central aim of the proposed work is to apply wall suction to attenuate the intensity of Klebanoff modes arising in swept-wing laminar boundary layers due to free-stream turbulence. These flow structures have never been studied over large scale aerodynamic bodies, despite their vast importance in numerous industrial and technological applications, such as the design of aircraft wings and turbine blades. The effects of wall suction have not been investigated for these technologically relevant flows. A reason for the dearth of works is the extreme difficulty in predicting and controlling such flows.The problem will be tackled by a combination of mathematical and numerical techniques. The proposed approach will offer a fast and numerically robust toolkit in line with the long-standing effort of the fluid mechanics community to control pre-transitional flows in an efficient manner.

壁吸力已被广泛用于减少层流边界层扰动的增长，例如 Tollmien-Schlichting 波、交叉流涡流以及最近的 Klebanoff 模式，即由自由流涡旋产生的不稳定流向伸长低频扰动扰动。壁吸力导致了向湍流过渡的延迟，带来了重大好处，例如减少粘性阻力、噪音和燃料消耗。拟议工作的中心目标是应用壁吸力来减弱扫掠中产生的 Klebanoff 模式的强度- 由于自由流湍流而产生的机翼层流边界层。尽管这些流动结构在许多工业和技术应用中非常重要，例如飞机机翼和涡轮叶片的设计，但从未在大型空气动力体上进行过研究。对于这些技术相关的流动，尚未研究壁吸力的影响。缺乏相关工作的一个原因是预测和控制此类流动极其困难。该问题将通过数学和数值技术的结合来解决。所提出的方法将提供一个快速且数值稳健的工具包，符合流体力学界长期以来为有效控制过渡前流动所做的努力。

项目成果

Streamwise-travelling viscous waves in channel flows.

河道流动中沿河道行进的粘性波。

• DOI: http://dx.10.1007/s10665-018-9953-y
• 发表时间: 2018
• 期刊: Journal of engineering mathematics
• 影响因子: 1.3
• 作者: Ricco P

Laminar Streaks in Oscillating Boundary Layers

振荡边界层中的层流条纹

• DOI: http://dx.10.1016/j.piutam.2015.03.049
• 发表时间: 2015
• 期刊: Procedia IUTAM
• 作者: Hicks P

Laminar streak growth above a spanwise oscillating wall

展向振荡壁上方的层流条纹生长

• DOI: http://dx.10.1017/jfm.2015.98
• 发表时间: 2015
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Hicks P

Growth of boundary-layer streaks due to free-stream turbulence

由于自由流湍流而导致边界层条纹的增长

• DOI: http://dx.10.1016/j.ijheatfluidflow.2016.05.003
• 发表时间: 2016
• 期刊: International Journal of Heat and Fluid Flow
• 影响因子: 2.6
• 作者: Ricco P