摘要
本文用气固二相流模型模拟了风沙稳定输运过程。若起跳沙粒运动状态分布函数采用由实验得到的正态分布函数形式时,计算出的水平质量流量通量随高度的变化规律与实验结果不同。经深入分析,本文提出一新的起跳沙粒运动状态分布函数形式。其中初始起跳角的分布仍采用正态分布函数形式,而对初始起跳速度则采用指数函数和正态分布函数的分段函数形式。计算结果表明本文提出的起跳沙粒运动状态分布函数与实际情况吻合较好。
The equilibrium Aeolian sand transport is simulated by Lagrange gas-solid two-phase
model in this paper. When the velocity and angle distribution of ejected grains are described by
normal distribution function obtained by Nalpanis & Hunt in their experiment, the simulated profile
of horizontal mass flux is inconsistent with the experimental profile. After detail analysis, we present a
modified splash function in which the angle distribution of ejected grains is fitted by normal function
and the velocity distribution is fitted by a segmented function comprised of exponential distribution
and Gaussian distribution. The simulation result indicates that the modified splash function can well
describe the nature of ejection phenomenon in equilibrium sediment transport.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2004年第3期448-450,共3页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展规划项目资助(No.G2000048702)
关键词
分布函数
沙粒
起跳
splash function
sediment transport
ejected sand
