颗粒加速规律研究及其在沙尘暴防治中的应用

对气固两相流中的颗粒加速运动规律进行了研究，给出了在克莱契柯(Klyachko)和普特内木(Putnam)阻力系数下的颗粒加速时间和加速长度的解析解和数值解，对不同粒径的固体颗粒在不同风力作用下的颗粒起动加速长度和加速时间进行了分析，并将理论及数值研究成果应用于沙尘颗粒的初始运动规律研究，提出沙尘暴的防治关键在于预防沙尘颗粒被风蚀起动的观点。通过分析对比，给出了有关沙尘暴防治方面的几点建议。

STUDY ON THE LAW OF PARTICLE ACCELERATION MOTION AND ITS APPLICATION TO PREVENTION OF SANDSTORM

The law of particle acceleration motion in gas-solid two-phase flow is studied. The analytical solution and the numerical one of the acceleration time and the acceleration length are given for particles under the action of Klyachko and Putnam forces. The acceleration time and the acceleration length are studied for the single spherical particle with different diameters and velocities of wind,and the results are applied to the acceleration motion of the dust and sand particles. In the end of this paper,it is presented that the key to prevent sandstorm is to prevent the particle from wind erosion and acceleration,and some suggestions on prevention of sandstorm are made by analysis and comparison.