Study of Stability and Instability of Boundary Layer Flow on Rotating Curved Wall

旋转曲墙边界层流稳定性与不稳定研究

• 批准号: 11450076
• 负责人: KIKUYAMA Koji
• 金额: $ 8.13万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450076/
• 关键词: Boundary Layer; Transition; Coriolis Force; Centrifugal Force; Wall Curvature; Velocity Distribution; Goertler Vortex; Tollmien-Schlichting Waves

The boundary layer flows in rotating channels such as impeller passages of turbomachinery are dominated by the centrifugal and Coriolis forces due to the wall curvature and system rotation, respectively, which predominate the boundary layer development by suppressing or promoting the turbulent motion. Though many studies have been made about the turbulent boundary layer over a concave or convex surface in the stationary state, the resultant effects due to the Coriolis force in the rotation frame have scarecely been made.In the present project, the velocity and turbulent intensity are measured near the concave surface in channels whose centerline radii of curvature are 1,000mm and 2,000mm, respectively, for different rotating conditions.Main results can be summarized as follows ;(1) The Coriolis force exerting normally toward the wall promotes the Goertler instability and advances the transition of the flow from laminar to turbulent state, but that exerting from the wall delays the transition.(2) The transition occurrs when the Reynolds number based on the momentum thickness exceeds a critical value, regardless of the difference in the rotation rate and the main flow velocity.(3) At negative rotation rates the fluctuating component is suppressed and a further decrease generates a different type of instability.

旋转通道（例如涡轮机械的叶轮通道）中的边界层流动分别由壁曲率和系统旋转引起的离心力和科里奥利力主导，它们通过抑制或促进湍流运动来主导边界层的发展。尽管人们对静止状态下凹面或凸面的湍流边界层进行了很多研究，但对旋转坐标系中科里奥利力的综合效应却很少研究。在本项目中，在不同的旋转条件下，分别测量了中心线曲率半径为1,000mm和2,000mm的通道凹面附近的速度和湍流强度。主要结果可总结如下 ;(1) 正常向壁面施加的科里奥利力会促进戈特勒不稳定性并促进流动从层流状态向湍流状态的转变，但从壁面施加的科里奥利力会延迟该转变。(2) 当基于动量厚度的雷诺数超过临界值时，无论旋转速率和主流速度的差异如何，都会发生转变。(3) 在负旋转速率下， 波动成分被抑制，进一步减少会产生不同类型的不稳定。

项目成果

菊山功嗣 他3名: "回転曲面上の境界層流れの安定性に関する研究"日本機械学会講演論文集. 00・14. 277-277 (2000)

Koji Kikuyama等3人：“旋转表面上边界层流的稳定性研究”日本机械工程师学会会议记录00・14（2000）。

K.Kikuyama, et al.: "Study on Boundary Layer Flow on Rotating Curved Wall"Fluid and Heat engineering Research. 34-2 (in Japanese). 21-28 (1999)

K.Kikuyama等：“旋转曲壁上的边界层流动研究”流体与热工程研究。

K.Kikuyama, et al.: "Study on Stability of Boundary Layer Flow in Rotating Curved Channel"Proceedings of JSME Fluid Engineering Division. 00-14 (in Japanese). 277-277 (2000)

K.Kikuyama等：“旋转曲线通道中边界层流动稳定性研究”JSME流体工程分部论文集。

菊山功嗣 他3名: "回転曲面上の境界層流れに関する研究"流体熱工学研究. 34・2. 21-28 (1999)

Koji Kikuyama等3人：“旋转表面上的边界层流动的研究”流体热工研究34・2（1999）。