西安交通大学能源与动力工程学院,西安,710049
网络首发:2009-07-10,
纸质出版:2009
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王大伟 1, 王元 1, 杨斌 1, 等. 沙粒跃移击溅函数的高速数字摄像研究[J]. 西安交通大学学报, 2009,43(7):125-128.
Research on Sand Saltation Splash Function by High Speed Digital Camera[J]. 2009, 43(7): 125-128.
采用高速CMOS数字相机拍摄的方法记录沙粒与床面的碰撞过程
通过分段图像叠加的算法对获得的实验图像进行处理
提取出沙粒运动时序位置
并计算其入射以及反射的速度和角度.通过统计分析得出跃移沙粒与沙床碰撞过程中的控制参数——碰撞平面角、速度和能量恢复系数的分布
都近似满足正态分布.实验结果表明
沙粒与沙床碰撞过程中损失的动能超过总能量的一半
且由于碰撞平面角大于0°的比例达到70%
即使沙粒在碰撞过程中能量有所损失
沙粒与沙床碰撞后垂直分速度增加的现象仍比较普遍
使得沙粒在与气流相互作用的过程中获取更多的能量
从而为沙粒的持续跃移提供了保证.
A high speed CMOS digital camera was used to record the process of sand grain collision with the sand bed. With the subsection addition image processing method
the temporal position of saltating sand grain was extracted from the experimental images
and the speed and angles of impacting and rebounding were also calculated. With the statistical method
some parameters of the collision process were presented
including the distributions of speed
energy recoverable coefficients and collision angles and these parameters displayed normal distribution. The results show that
during the period of collision between the sand grain and the sand bed
the lost kinetic energy is more than half of the total energy. Moreover
because the percentage of collision angles with more than 0° is up to 70%
the vertical speed of sand increases even if the kinetic energy decreases
which ensures that the sand particles can receive more energy from the air to keep on the saltation movement.
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风水流中沙粒相输移的测量.西安交通大学学报,2006,40(7):846-850.
微通道内流的微尺度粒子图像测速技术实验研究.西安交通大学学报,2007,41(11):1355-1359.
粗糙元特征对风洞中大气表面层模拟的影响.西安交通大学学报,2009,43(3):87-91.
一种新的测定流体质扩散系数的全息干涉图像处理方法.西安交通大学学报,2008,42(11):1350-1355.
一种基于小波的Contourlet变换的图像压缩算法.西安交通大学学报,2007,41(4):479-483.
基于双密度双树复数小波变换的图像去噪.西安交通大学学报,2006,40(2):246-248.4,20日完稿5,15一校二校6,16三校6,29
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