摘要
介绍了后混式射流粉碎技术中射流粉碎工作原理和流动特性。通过理论分析、数值计算和粉碎实验相结合的方法,基于加速管内的气、液、固多相混合介质耦合流动特性,研究了加速管管径对射流的流动特性和粉碎效率的影响,并利用加速分区理论对各加速区域特征参数进行了定量。研究表明:加速管管径对射流流动特性和粉碎效率影响显著;加速管管径越小对射流能量的约束集中效果越好;使颗粒尽量靠近或进入射流高效加速区,可获得更高粉碎效率;管径越大粉碎效率越低。
The working principle and flow characteristics of postmixed jet flow comminuting technology are intro- duced in this paper. Combining with the methods of theoretical analysis, numerical calculation and grinding experi- ments, the effect of accelerating pipe size on jet characteristics and its grinding mechanism are investigated based on the multi-phase mixture coupled flow characteristics in the accelerating pipe which is composed of gas, stream and liquid. Researches show that accelerating tube diameter has significant influence on the jet flow characteristics and grinding efficiency. By using the acceleration zone theory, the characteristic parameters of each acceleration re- gion are fixed quantity. The smaller the accelerating tube diameter is, the better the result on the energy constraint of jet is ; and the larger the diameter is, the lower the grinding efficiency is. The higher grinding efficiency will be obtained when the particles are close to or into the jet high-efficient acceleration zone.
出处
《机械科学与技术》
CSCD
北大核心
2014年第3期354-360,共7页
Mechanical Science and Technology for Aerospace Engineering
基金
陕西省重点学科建设专项资金项目(00X902)资助
关键词
多相射流
射流粉碎
加速分区
粉碎机理
acceleration
boundary conditions
calculations
comminution
computer simulation
efficiency
experiments
grinding （ comminution ）
kinetic energy
mathematical models
muhiphase flow
pipe
schematic diagrams
turbulent flow
velocity distribution
muhiphase jet
jet comminution
acceleration zone
grinding mechanism
