摘要
气力输送是一种利用气流能量来输送颗粒状物料的技术,广泛应用于粮食加工和储运。在输送过程中,粮食颗粒会因为颗粒与颗粒、颗粒与管道之间的碰撞,导致颗粒破碎,从而增加储存难度、降低粮食品质。因此,研究粮食颗粒在气力输送中的破碎行为及优化输送系统对提高粮食品质具有重要意义,而数值模拟是这类设计的关键依据。综述了气力输送过程中粮食颗粒破碎的数值模拟研究进展,归纳了三种气力输送的数值模拟方法,介绍了计算流体力学和离散元耦合数值方法(CFD-DEM)在粮食输送中的应用。就粮食颗粒的物理特性、力学特性以及对气力输送中的破碎机制做出了总结归纳。针对降低破碎率提出两种方法:设计弯径比和调节输送风速。最后讨论了当前气力输送粮食颗粒模拟研究的局限性,总结了主要结论。
Pneumatic conveying is a technique that utilizes airflow energy to transport granular materials and is ex-tensively applied in grain processing,storage,and transportation.During conveying,grain particles are prone to breakage due to collisions between particles and between particles and pipeline walls,leading to increased storage challenges and diminished grain quality.Therefore,investigating the fragmentation behavior of grain particles in pneumatic conveying and optimizing the conveying system to enhance grain quality is of great importance.Numeri-cal simulation serves as a crucial tool for guiding such design efforts.This paper reviews recent advances in the nu-merical simulation of grain particle breakage during pneumatic conveying,outlines three primary methods of simula-tion,and highlights the application of coupled Computational Fluid Dynamics and Discrete Element Method(CFD-DEM)analysis in grain transportation.The physical and mechanical properties of grain particles and the frag-mentation mechanism in pneumatic conveying are summarized.To mitigate the breakage rate,two methods are pro-posed:optimizing the bend radius-to-diameter ratio and adjusting the conveying air velocity.Finally,the limitations of current simulations in pneumatic grain conveying are discussed.
作者
黄波
杨天成
罗鑫皓
毛根武
董德良
贺波
李晓亮
付迁
唐文强
Huang Bo;Yang Tiancheng;Luo Xinhao;Mao Genwu;Dong Deliang;He Bo;Li Xiaoliang;Fu Qian;Tang Wenqiang(Sinograin Chengdu Storage Research Institute Co.,Ltd.,610091;Xihua University,610039)
出处
《粮食储藏》
2025年第4期74-86,共13页
Grain Storage
基金
四川省科技计划资助(2024NSFSC0435)。
关键词
气力输送
粮食颗粒
CFD-DEM
数值模拟
破碎率
弯径比
输送风速
pneumatic conveying
grain particles
CFD-DEM
numerical simulation
breakage rate
bend radi-us-to-diameter ratio
conveying wind speed
