Research on Sand Saltation Splash Function by High Speed Digital Camera

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Research on Sand Saltation Splash Function by High Speed Digital Camera

更新时间：2025-07-09

- Research on Sand Saltation Splash Function by High Speed Digital Camera
- Vol. 43, Issue 7, Pages: 125-128(2009)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： O359
- Online First：10 July 2009，
  
  Published：2009
- 稿件说明：
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Research on Sand Saltation Splash Function by High Speed Digital Camera[J]. 2009, 43(7): 125-128.
DOI：

Research on Sand Saltation Splash Function by High Speed Digital Camera[J]. 2009, 43(7): 125-128. DOI：

摘要

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.

Abstract

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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references

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