Investigation of Transition in 3D-Boundary Layer

3D 边界层中的转变研究

• 批准号: 11694122
• 负责人: KOHAMA Yasuaki
• 金额: $ 8.89万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11694122/
• 关键词: 3D-Boundary Layer; Next generation aircraft; Drag-reduction method; Transition measurement; Boundary layer control

Through 3 years of this research project, we have succeeded to clarify the complicated 3D transition mechanism. Especially, swept wing boundary layer transition mechanism is as follows : Streamwise stationary vortex system starts to appear as the primary instability. Unsteady wave instabilities of two different frequency modes are induced by this stationary vortices. High frequency secondary instability is considered to be the key sequence for the turbulent transition.Moreover, we succeeded in delaying a transition from laminar to turbulent in 3D-boundary layer on swept-wing effectively, and confirmed the reduction of the frictional resistance of swept wing. By sucking the low momentum flow selectively at the position of stationary vortices, we have succeeded to delay the transition with at least 1/3 of the suction volume compared with the uniform suction case.

通过3年的研究，我们成功地阐明了复杂的三维转换机制。特别是后掠翼边界层转捩机制如下：流向定常涡系开始出现作为主要不稳定性。这种定常涡引起两种不同频率模式的非定常波动不稳定性。高频二次不稳定性被认为是湍流转捩的关键序列，并且我们成功地延迟了后掠翼三维边界层从层流到湍流的转捩，证实了后掠翼摩擦阻力的减小。通过在定常涡位置有选择地抽吸低动量流，我们成功地使转捩延迟，与均匀抽吸情况相比，抽吸体积至少为1/3。

项目成果

M.SHIMAGAKI, Y.KOHAMA: "Possibility of Passive Control on a Swept Flat Plate"Proceedings of the Workshop on Drag Reduction of Aircraft and Ground Transportation. 2-3 (2000)

M.SHIMAGAKI、Y.KOHAMA：“扫掠平板上被动控制的可能性”飞机和地面交通减阻研讨会论文集。

春田善之, 花崎秀史, 小濱泰昭: "後退翼境界層の乱流遷移における撹乱の成長"日本機械学会東北支部35期総会・講演会・講演論文集. AIAA-2001. 8-9 (2000)

Yoshiyuki Haruta、Hidefumi Hanazaki、Yasuaki Kohama：“后掠翼边界层湍流转变中的扰动增长”第 35 届大会记录、讲座以及日本机械工程师学会东北分会的讲座。 2001. 8-9 (2000)

Y.P.KOHAMA, H.ALFREDSSON, Y.EGAMI, M.KAWAKAMI: "Turbulent Energy Production Mechanism in General Boundary Layer Transition"IUTAM Symposium on Laminar Turbulent Transition. 205-210 (1999)

Y.P.KOHAMA、H.ALFREDSSON、Y.EGAMI、M.KAWAKAMI：“一般边界层跃迁中的湍流能量产生机制”IUTAM 层流湍流跃迁研讨会。

M.Kawakami: "Stability Characteristiecs of Stationary Crossflow Vortices in Three-Dimensional Boundary Layer"AIAA Paper(1999), AIAA99-0811. Reno NV. 1-11 (1999)

M.Kawakami：“三维边界层中静止横流涡的稳定性特征”AIAA论文（1999），AIAA99-0811。

Y.P.Kohama: "Turbulent Energy Production Mechanism in General Boundary Layer Transition"IUTAM Symposium on Laminar-Turbulent Transition. 6 (1999)

Y.P.Kohama：“一般边界层转变中的湍流能量产生机制”IUTAM 层流-湍流转变研讨会。