| 三维扰动波在局部粗糙边界层中的稳定性研究 |
| |
| 作者姓名： | 曹卫东 陆昌根 胡庆喜 |
| |
| 作者单位： | [1]河海大学环境科学与工程学院,中国南京210098 [2]华南理工大学制浆造纸工程国家重点实验室,中国广州510640 |
| |
| 基金项目： | 国家自然科学基金
,
高等学校博士学科点专项科研项目 |
| |
| 摘 要： | 采用局部喷、吸、喷和吸组合来模拟局部粗糙壁面,数值计算获得稳定的三维边界层的基本流.在此基础上研究了三维扰动波在该基本流中的空间演化问题,讨论了局部粗糙的形式、分布结构对三维扰动波的幅值增长率及流动稳定性影响.计算结果表明:三维局部粗糙对三维扰动波的增长、涡的形成都起着激励的作用.扰动波演化产生的平均流修正及局部粗糙诱导展向速度的存在,影响着流体运动稳定性.与光滑壁面相比,三维局部粗糙作用下扰动波的传播角度与相位角发生明显变化,而不同形式的二维局部粗糙壁面边界层显示出不同的稳定特性.
|
| 关 键 词： | 局部粗糙 边界层 三维扰动T-S波 稳定性 local roughness boundary layer 3-D disturbance T-S wave stability 三维扰动波 局部 边界层 稳定性研究 ROUGHNESS LOCAL DISTRIBUTED BOUNDARY LAYER WAVES DISTURBANCE characteristics Propagation direction phase shift modification evolvement finite amplitude existence |
| 修稿时间： | 2007/1/12 0:00:00 |
STABILITY OF 3-D DISTURBANCE WAVES ON BOUNDARY LAYER WITH DISTRIBUTED LOCAL ROUGHNESS |
| |
| Authors: | Cao Weidong Lu Changgen Hu Qingxi |
| |
| Institution: | 1. College of Environmental Science and Engineering, Hohai University, Nanjing, 210098, P. R. China ; 2. State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, P. R. China |
| |
| Abstract: | The numerical solution of the stable basic flow on a 3-D boundary layer is obtained by using local ejection, local suction, and combination of local ejection and suction to simulate the local rough wall. The evolution of 3-D disturbance T-S wave is studied in the spatial processes, and the effects of form and distribution structure of local roughness on the growth rate of the 3-D disturbance wave and the flow stability are discussed. Numerical results show that the growth of the disturbance wave and the form of vortices are accelerated by the 3-D local roughness. The modification of basic flow owing to the evolvement of the finite amplitude disturbance wave and the existence of spanwise velocity induced by the 3-D local roughness affects the stability of boundary layer. Propagation direction and phase of the disturbance wave shift obviously for the 3-D local roughness of the wall. The flow stability characteristics change if the form of the 2-D local roughness varies. |
| |
| Keywords: | local roughness boundary layer 3-D disturbance T-S wave stability |
|
| 点击此处可从《》浏览原始摘要信息 |
| 点击此处可从《》下载免费的PDF全文 |
