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

已经通过引入一对流向涡旋，直径和强度暂时变化的壁式涡流，进行了一项实验研究。将重点放在首位，以了解管理对壁层自相似性中湍流涡流出现的层次结构的影响。实验性工作是在三种壁湍流中进行的，即边界层，二维通道流动和湍流的壁式射流。从实验研究中获得的结论总结如下1。在拒绝压力梯度下，在边界层的壁层中证实了壁定律的层次结构和存在。2。将直径暂时变化和强度暂时变化的一对流向涡流引入了平面湍流壁式射流的内层。可以看出，管理层可有效使用实际应用；流向动量通量被增加并运输到……更多的墙。3。壁界剪切流由直径暂时变化的流向涡流管理，并且强度恢复的速度比没有临时变化的流向涡流更快。可以理解，具有暂时变化的流向涡流类似于未受干扰的壁层中的湍流涡流4。对定期速度成分在动力学中的影响的详细研究通过相位平均技术和瞬时波动速度成分的三重分解进行。对雷诺涉及的生产术语的评估剪切应力和湍流能量方程式显示了周期性成分对动量和能量平衡的贡献。5。通过三重分解对能量传输的研究表明，考虑到大规模运动引起的非本地效应，涡流粘度模型的有效性。实验研究表明，考虑到层次结构的流向涡流的管理，剪切层恢复到相似性曲线的速度更快，并增强了自由流液体的两个入口和动量向墙的运输。较少的