摘要
本文采用热线、压力传感器和PIV方法对中等雷诺数下角区湍流流动进行了实验测量。设计了基于小波变换的一种湍流场特征流动结构检测方法 ,辨识出了角区湍流的分离涡结构及其尺度。这些涡结构的发现揭示了角区马蹄涡系运动在低雷诺数下所展示的物理过程在中等雷诺数或充分发展湍流状态下仍然存在。同时 。
The juncture turbulence is measured using hot wire anemometer, mechanical pressure scanner, and PIV system. A new method based on the wavelet transform is introduced to detect flow structures in the juncture turbulence. It is found that the boundary layer releases separate vortexes randomly because of the adverse pressure gradient produced by the cylinder. This procedure is consistent with the observation of the oscillating horseshoe vortex system of juncture flow in low Reynolds number by flow visualization.
出处
《空气动力学学报》
CSCD
北大核心
2001年第4期414-419,共6页
Acta Aerodynamica Sinica
基金
95攀登计划预选项目与国家自然科学基金重大项目 (No 5 9895 410 )
