CHARACTERISTICS OF THE BOUNDARY LAYER NEAR THE JUNCTURE WITH 3-DIMENSIONALLY SEPARATED VORTICES

本文的目的是对交界处附近有纵向涡的边界层特性进行实验研究。本文主要针对速度场中的浑浊或雷诺应力特性，采用三热线风速仪进行了实验研究，得到了以下结果。研究了平板上的边界层与其上圆柱周围的马蹄涡的相互作用。利用相互作用因子计算了海洋结构物在振荡流中由于粗糙度引起的阻力增量。计算结果与实验测量结果吻合较好。在KSNAJ春季会议上提交了一篇论文，(1994)2.在风洞中用三丝风速仪测量了全船体型周围的流场，以研究湍流和雷诺应力的特性。为验证舰船尾部流场CFD计算结果提供了准确的数据库。一篇论文将在第27届湍流研讨会上发表。(1995)3.利用三热线风速仪对平板边界层与翼尖涡间的相互作用进行了基础研究。计算结果显示了涡心附近湍流和雷诺应力的基本特征。实验结果将在KSNAJ秋季会议上公布。(1995)4.用厚边界理论计算了有自由面和三维分离涡的尾部附近的流场。计算结果与实验结果定性吻合。

The objective of this paper is to investigate experimentally into the characteristics of the boundary layr with longitudinal vortices near the juncture. The investigation on characteristics of turblence or Reynolds stress in the velosity field are mainly aimed using triple hot wire anemome try.The following results are obtained.1. Interaction between boundary layr on a flat plate and horse shoe vortices around circular cylinders on it are investigated. The resistance increse of marine structures due to the roughness in oscilating flows are calculated using the interaction factors. The results shows good agreement with the experimentally measured one. A paper has presented at the spring meeting of the KSNAJ,(1994).2. Flow fields around a full ship form are measured in the wind tunnel by the triple wire anemonetry to investigate the characteristics of turbulence and Reynolds stresses. The accurate data-bases are obtained to validate the CFD results near the ship stern flow field. A paper will be presented at the 27th Symposium on Turbulence. (1995)3. Basic investigation into the interaction between the boundary layr on the flat plate and a wing tip vortex is performed by the triple hot wire anemomertry. The results show the basic characteristics of the turbulence and Reynolds stress near the vortex center. Experimental resuls will be presented at the Autum meeting of the KSNAJ.(1995)4. Thick boundary theorm is applied to calculate the flow field near the stern with free surface and 3-d separated vortices. The results show qualitative agreement with the experimental results.