模拟尾流泡幕及实际尾流光学性质对比研究  

Comparison Research of Simulated and Effective Wakes

作　　者：张建生[1,2] 林书玉[1] 何俊华[3] 陈良益[3] 

机构地区：[1]陕西师范大学物理系 [2]西安工业大学数理系,西安710032 [3]中国科学院西安光学精密机械研究所

出　　处：《光子学报》2007年第10期1920-1923,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(10274046);武器装备预研基金(51448030101ZK1801)资助

摘　　要：对模拟尾流泡幕及实际尾流光学性质进行了对比研究.结果表明,实验室模拟尾流气泡幕的散射光平均照度均值随着压强变化梯度大,可据此定性区别不同压强的气泡幕.实际尾流随着航速增大,散射光照度减小,但这种减小不是线性的.散射光照度一定周期性的规律,说明随着航速的增大,尾流气泡幕逐渐增强,气泡幕中气泡密度、不同直径气泡分布等均随之变化,这可能预示着气泡幕的增强存在饱和度.实验室模拟尾流气泡幕与实际尾流的散射光信号在轮廓方面是相似的,都随着压强或航速的增加而减小.通过比较实验室模拟气泡幕和实际尾流的差值信号,可以有效地消除杂散光或自然光的影响,利用Haar小波对差值信号的分析也得到相同的结论.Comparison research of simulated and effective wakes is carried out. Investigation reveals that mean illumination of scattered light from simulated bubble films possesses great gradient against N2 pressure. Accordingly, bubble films under different pressures can be differentiated qualitatively. Illumination of effective wakes decreases nonlinearly with the ship speed. Bubble film builds up gradually,the thickness and distribution with diameters and etc change,along with the increasing of the speed of ship, based on the periodicity of scattered light illumination. As prefigures possibly a saturation of the enhancement of bubble film. Both simulated and effective wakes have analogous outline of scattered light semaphore which breaks down along the growth of pressure or ship speed. Effects of stray and natural light can be eliminated availably comparing the difference signals of simulated and effective wakes. The same verdict is based on Haar wavelet analysis to the difference.

关 键 词：光学性质 尾流 气泡幕 小波 HAAR小波 

分 类 号：O439[机械工程—光学工程]