雪面侵蚀系数及其概率分布研究

Study on Surface Erosion Coefficient and Its Probability Distribution

近年来,计算流体动力学(CFD)的方法被应用于对风致积雪漂移运动进行数值模拟。其中,雪面侵蚀系数是一个重要参数,计算时通常假定其为一个常数。为了探讨雪面侵蚀系数的影响因素,基于空旷风场条件推导了计算雪面侵蚀通量公式中侵蚀系数的表达式,将其表达为空气密度、雪颗粒密度、雪颗粒粒径及雪颗粒粘结强度的函数,分析了这些参数对侵蚀系数取值大小的影响,给出了其概率分布特性及对应的取值范围,对其工程应用提出了适当的建议。

In recent years,computational fluid dynamics（ CFD） method is applied to simulate wind-induced snow drifting. The erosion flux is an important parameter in this method. It is always assumed to be a constant for all cases. To explore the factors affecting this parameter,the expression is deduced based on empty flow area. The erosion coefficient is expressed as the function of air density,snow particle density,snow particle radius and snow particle bond strength. Then the effect of these parameters to erosion efficient are analyzed. At last,the probability distribution and range of the value of the erosion coefficient is also presented in this paper. Some suggestions for engineering are put forward based on the analysis.