基于图像处理的模拟尾流气泡幕研究

利用图像处理技术,对模拟的尾流气泡幕进行了定性和定量分析.压强较小时,位于不同层面上气泡的重叠少,通过二值图像处理可清楚地观察气泡的尺度大小及密度分布;而当压强较大时,不同层面气泡重叠幅度大,大部分气泡的边界难以判断,不能够得到气泡尺度参量及密度分布等信息.利用区域分割技术对获取的气泡幕灰度图像进行伪彩色显示,定性分析了气泡幕中气泡尺度、分布等信息.基于形状分析的等效直径、气泡幕剩余面积和剩余面积变化显示,不同压强下气泡的等效直径分布均在5～100像素范围,平均等效直径为55像素,压强较小条件下小气泡比例较大.

Research of Stimulated Wakes' Bubble Film Based on Image Processing

Qualitative and quantitative analysis of stimulated wakes′ bubble film (SWBF) is carried out based on image processing technology. Scales and the density distribution (SDD) of bubbles are observed clearly under minor pressures as the overlap of bubbles layered is fine, vice versa. Pseudo color displays of bubble film gray images are got based on area separating technology, also information such as SDD is analyzed qualitatively. Arrangement of ED, residual and differential proportion of bubble films based on shape analysis show that ED of bubbles with different pressures ranges from 5 to 100 pixel, the average ED is about 55 pixel, and mall bubbles possess a great proportion with minor pressure.