锤片式揉碎机气流场数值模拟与试验  

Air Flow Field Numerical Simulation and Test of Hammer Rubbing Machine

作　　者：刘飞[1] 王伟[1] 张涛[1] 麻乾[1] 赵满全[1] 

机构地区：[1]内蒙古农业大学机电工程学院,呼和浩特010018

出　　处：《农业机械学报》2018年第S1期227-232,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51665047);内蒙古自治区自然科学基金项目(2016BS0516)

摘　　要：为研究揉碎机锤片结构参数与揉碎效率之间的关系,实现高效能揉碎,从空气动力学角度出发,分析在T型结构锤片的激励下,揉碎机内腔气流场结构与物料运动之间的关系。运用计算流体动力学(CFD)技术,分析揉碎机内腔气流场的压力场分布形态和速度场分布形态。模拟结果表明:揉碎机内腔气流轴向速度梯度较大,环流层的悬浮输送特性有利于物料充分揉搓和输送,整个揉碎室内从入料口到出料口轴向气流速度逐渐变大,流场速度梯度明显。设计验证试验,对模拟所得的风速与试验测得的值相比较,结果表明,仿真值与试验值变化趋势基本一致,二者最大相对误差为8%。Straw rubbing machine has many problems such as high energy consumption,low efficiency and high production cost,which seriously restrict the promotion and development of rubbing machine. In order to achieve efficient rubbing,the relationship between the hammer of rubbing machine structure parameters and rubbing efficiency was studied. From the perspective of aerodynamics,the relationship between rubbing machine cavity flow field structure and material movement in T type structure of hammer excitation was analyzed. And then the T type hammer excitation rubbing machine cavity flow field pressure distribution and velocity field distribution were obtained by using computational fluid dynamics(CFD) technology. The simulation results showed that the rubbing machine cavity air axial velocity gradient was large,and the transport characteristics of suspension circulation layer were high. The axial air velocity was increased gradually,and the flow field velocity gradient was obvious. Validation test was designed,and the simulation results of wind speed and test values were compared. Results showed that the simulation results were in agreement with the experimental values,and the maximum relative error of the two was about 8%. The results also showed that the numerical simulation of the flow field in the type9 R-40 straw rubbing machine was reasonable which can correctly indicate the distribution of flow field when the machine was no-load. The flow structure inside the machine can provide a new direction to optimize the rubbing,and also provide a theoretical basis for the optimization design of mechanical rubbing.

关 键 词：揉碎机 锤片 数值模拟 气流场 

分 类 号：S817.12[农业科学—畜牧学]