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中国沙漠 ›› 2003, Vol. 23 ›› Issue (6): 628-631.

• 研究论文 • 上一篇    下一篇

紊流风场中起跳沙粒的轨迹特征

邢茂, 郭烈锦   

  1. 西安交通大学 动力工程多相流国家重点实验室, 陕西 西安 710049
  • 收稿日期:2002-10-15 修回日期:2002-12-20 出版日期:2003-12-20 发布日期:2003-12-20
  • 作者简介:邢茂(1976-),男(汉族),山西大同人,博士生,主要从事风沙二相流及工程中多相流问题研究。E-mail:xingmaoxm@hotmail.com
  • 基金资助:
    国家重点基础研究发展规划项目(G2000048702)

The Trajectory Characteristics of Jumped Sand Particles in Turbulent Air Flow

XING Mao, GUO Lie-jin   

  1. State Key Lab of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2002-10-15 Revised:2002-12-20 Online:2003-12-20 Published:2003-12-20

摘要: 运用颗粒流体二相流的随机行走扩散模型(DRW)研究了紊流风场下起跳沙粒的运动轨迹特性。得出了轨迹特性(长度、高度、撞击角)随沙粒的大小和风速的变化规律,发现随沙粒粒径的减小紊流脉动对轨迹的影响显著增大。粒径在200μm以下时,紊流风场下计算得的轨迹形状与平均风场下得到的轨迹有明显差异。

关键词: 紊流, 沙粒, 轨迹

Abstract: A discrete random walk dispersion model is applied to study the trajectory characteristics of jumped sand particles in turbulent air flow in this paper.The law of the height and the length of trajectory change with sand diameter and wind velocity are obtained.With the particle diameter increased,the height,length and impact angle of trajectory increased.It is discovered that turbulent oscillation has greater influence on the trajectory of sand particle with smaller diameter.For sand particles with diameter less than 200 μm the trajectory forms computed from oscillate velocity and average velocity have distinct difference.If particle diameter is smaller than 100 μm the particle suspension phenomenon may occur in wind.

Key words: turbulent flow, sand, trajectory

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