基于图像方法模拟尾流气泡分布特性的研究

舰船尾流中气泡对尾流特性研究起着重要的作用,研究气泡数密度分布对于追踪舰船有着重要意义.用图像方法来研究气泡,具有直观、简便的优点.采用激光片光源限定采样区域,利用数学形态学的方法对气泡图像进行了处理.通过剪切、变灰度、调整照明和亮度、填充、膨胀、腐蚀等操作获得理想的图像并进行统计.用上述方法对记录气泡消散过程的图片进行处理,可以看出气泡的消散过程基本符合指数衰减的规律.

Simulation of Wake Bubble Distribution Characteristics Based on Image Method

The bubbles in the ship wake are very important for the research on wake characteristics. Bubble density distribution is significant to track ship. It is direct and easy for bubble research by using image method. Sampling area is limited by laser chip source and bubble image is processed by using mathematical morphology. The ideal image is obtained by cropping, grey-scale transformation, illumination and brightness adjustment, filling, dilating and eroding, and then statistics is made. The image recording the bubble dissipation course is processed by the methods mentioned above. It is shown that bubble dissipation course is accord with the exponential attenuation rule.