卡门常数研究现状及存在的问题  

Research Status and Existing Problems of Karman Constant

作　　者：柳小珊 卢金友[1] 廖小永[1] 吴昌洪[1] 

机构地区：[1]长江科学院河流研究所,武汉430010

出　　处：《长江科学院院报》2014年第6期1-6,共6页Journal of Changjiang River Scientific Research Institute

摘　　要：挟沙水流卡门常数是反映固液两相流中泥沙对水流结构影响的重要参数之一。鉴于此,回顾了卡门常数的来历、实质和卡门常数的影响因素、物理意义,总结了国内外因考虑因素不同而导出的卡门公式,接着对研究得到的卡门常数作了一个简要客观的评价,最后指出卡门常数进一步研究需要注意的问题:从能量输移理论进一步弄清楚能量分配机制,同时需要更精确的试验资料进行分析。The Von Karman constant of sediment-laden flow is considered as one of the most important parameters reflecting the influence of sediment transport on flow structure. To describe the flow structure, the origins of the Karman constant in real terms, the Karman constant factors and physical significance are reviewed, then the Karman formulas in China and abroad in consideration of different factors are summarized. Lastly, a brief and objective assessment on the Karman constant is made, and the problems that need further research are pointed out： the energy distribution mechanism should be explored in terms of energy transport theory, and more accurate test data are required.

关 键 词：卡门常数 挟沙水流 对数流速分布 混掺长度 

分 类 号：TV142[水利工程—水力学及河流动力学]