颗粒流中的冲击力  

Impact force of granule Flow

作　　者：白光富[1] 胡林[1] 孔维姝[1] 

机构地区：[1]贵州大学理学院,贵阳550025

出　　处：《振动与冲击》2012年第22期128-131,162,共5页Journal of Vibration and Shock

基　　金：贵州大学青年基金(2010-11);贵州省省长基金(2010-5)

摘　　要：通过实验研究宽沟道内颗粒流冲击力沿沟道分布与不同半径圆形颗粒冲击力,及冲击力谱曲线的渡越行为。结果表明:颗粒流稳定时,冲击力在沟道横向呈抛物线形分布;冲击力随滑移距离L的增大而衰减;单一尺寸颗粒流,稳定时冲击力随颗粒直径增大而增大;不同尺寸混合颗粒流,冲击力随不同尺寸颗粒质量比增大先增加后趋于饱和,存在指数关系;力谱曲线上升沿与下降沿区别明显。结果对实验研究不同固相比泥石流冲击特性或泥石流理论提供科学借鉴。The impact force distribution of granule flow was experimentally studied in a wide channel. The impact forces with different granular radiis and the transit charactristics of an impact force spectrum were investigated. The experimental results indicated that a parabolic curve distribution of impact force occurs in the lateral direction of the channel, when the granule flow is steady; the impact force decays with increase in sliding distance L; for the granule flow with the same size of particles, the impact force increases with increase in diameter of particle ; for the granule flow with different sizes of particles, the impact force increases with increase in mass ratio of different sizes of particles at first, then gradually and exponentially trends towards saturation; there exists an obvious difference between the up-edge and the down-edge of the impact force spectrum. The results provided a reference for further study on the impact behavior of mud- rock flow with different soild phase ratios.

关 键 词：颗粒流 冲击力 脉动荷载 渡越特征 

分 类 号：O469.3[理学—凝聚态物理]