Dynamical Management of Boundary Layer with Manipulating Hierarchy Structure of Turbulent Eddy

操纵湍流涡流层次结构的边界层动力学管理

基本信息

批准号：
17560152
负责人：
MOCHIZUKI Shinsuke
金额：
$ 2.3万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560152/
关键词：
Turbulence Boundary Layer Management Self-similarity Streamwise Vortical Structure

项目摘要

An experimental study has been made on management of wall bounded shear flows by introducing a pair of streamwise vortex, with temporal variation in diameter and strength, into the wall layer. The focus was placed to see what effects of the management on the hierarchical structure of turbulent eddy emerge in the self-similarity in the wall layer. Experimental work was made in three kinds of the wall turbulence, namely, boundary layer, two-dimensional channel flow, and turbulent wall jet. Concluding remarks obtained from the experimental study are summarized as follows.1. Under a adverse pressure gradient, hierarchical structure and existence of the wall law is confirmed in the wall layer of boundary layer.2. A pair of streamwise vortex with temporal variation in diameter and strength was introduced into the inner layer of plane turbulent wall jet. It is seen that the management is effective for use of practical application; streamwise momentum flux is increased and transported toward t … More he wall.3. The wall bounded shear flow managed by the streamwise vortex with temporal variation in diameter and strength recovers faster than the streamwise vortex without the temporal variation. It is understood that the streamwise vortex with temporal variation is resemble to turbulent eddies in undisturbed wall layer.4. Detailed study on the effect of periodic velocity components in dynamics was performed with phase averaging technique and triple decomposition of instantaneous fluctuating velocity components. Evaluation of production terms involved in Reynolds shear stress and turbulent energy equations shows considerable contribution of periodic component to momentum and energy balance.5. Investigation of energy transport with the triple decomposition suggests validity of eddy viscosity model considering non-local effect due to large scale motion.The experimental study shows that, with management of streamwise vortex considering the hierarchical structure, the shear layer recovers faster to similarity profile and enhances both entrainment of the free stream fluid and momentum transport toward the wall. Less

在引入仪表和强度的墙壁上进行了一项实验性研究，以查看管理层对壁层涡流结构的层次结构的影响。从实验研究中获得的三种壁湍流，边界ER，二维通道和turberent壁式射击。平面湍流墙的内部射击，用于t的管理式，朝向t的墙壁。3与未扰动的壁层相似。4与瞬时速度组件的三个相位平均和三重分解。实验研究表明，涡流粘度对非本地效应进行建模，表明，层次的层状效果更快地到达较小的河流和夹带