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Investigations on several mechanical problems in windblown sand movement
  • 期刊名称：Science Foundation in China
  • 时间：0
  • 页码：56-60
  • 语言：中文
  • 分类：O359.2[理学—流体力学;理学—力学]
  • 作者机构：[1]西部灾害与环境力学教育部重点实验室,甘肃兰州730000, [2]兰州大学土木工程与力学学院,甘肃兰州730000
  • 相关基金：国家自然科学基金中法合作研究项目（10811130470）;国家自然科学基金项目（10772073）;国家自然科学基金重点项目（10532040）; 高等学校博士学科点专项科研基金项目（20060730014）
  • 相关项目：风沙运动研究中的若干基本力学问题
作者： Zheng Xiao Jing|
关键词： 风洞, 粒子图像测速仪, 天然混合沙, 速度分布, 起跳速度, wind tunnel, PIV, nature sand, velocity distribution, take off velocity
中文摘要：

采用PIV（Particle Image Velocimetry）系统测量了天然混合沙风沙两相流中沙粒的速度分布特征,得到了沙粒入射以及起跳的速度分布情况,并且分析了沙波纹对风沙运动的影响。结果表明：沙粒运动过程中的速度分布与沙粒起跳速度的分布可以应用对数正态分布来表明;当有沙波纹存在时,沙粒总体速度分布与平坦沙床面差别很大,是不可忽略的重要因素;平坦沙床面沙粒平均入射速度是起跳平均速度的1.005倍~1.4倍,具体关系可以应用线性函数来拟合。

英文摘要：

Sand velocity in aeolian sand transport is measured using the PIV system（Particle Imaging Velocimetry） in a wind tunnel.The velocity probability distribution of ascending and descending particles,as well the influences of sand ripple on the sand particle motion are analyzed.The results show that velocity distributions of take-off particles and particles during sand movement accord with logarithm normal distribution.The mean incident velocity of sand particles is 1.005-1.4 times higher than take-off ones with different wind speed.It is found that sand ripples play an important role on the sand particles motion,which is a key factor that can not be neglected.

同期刊论文项目
风沙运动研究中的若干基本力学问题
期刊论文 53 会议论文 73 著作 1
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