基于滑移网格技术的揉碎机内流场研究

为研究揉碎机揉碎腔内的流场结构和流动状态,运用计算流体力学方法,基于滑移网格技术,对揉碎机空载时腔内的湍流非定常流场进行了三维瞬态数值模拟,得到了转速为2 800r/min时,揉碎机转子转动1周时间内,揉碎室和抛送室的流场空气动力学特性参数随时间变化规律,准确地反映了瞬态流场结构信息。结果表明:低压区在抛送室中半径为0~20mm附近,最高压力区在抛送叶片与内壁间隙,容易形成回流造成物料排出不易;启动阶段最大速度发生在出料口内侧尖角区域;轴向压力速度分布过于均匀,进而影响整机效率。此研究为揉碎机内部流场结构优化提供了新方法,提出了改进该机型的方向,为优化该机效率奠定了理论基础。

Numerical Simulation on Inner Flow Field of 9 R-40 Rubbing and Breaking Machine Based on Sliding Meshes

So as to studying the structure and status of inner flow field of rubbing and breaking machine , the Turbulent unsteady flow field of unloaded working conditions under rotating rate at 2 800r/min were simulated with computational fluid dynamics( CFD) and moving meshes method .Acquired its properties of flow area inside altering with time , which reflects the transient flow field structure information accurately .The simulated results could show that the low pressure ar-ea appeared in region of 0~20 mm radius near the throwing chamber , while maximum pressure zone formed between the gap of throwing blades and the inner wall forming a reflux resulting in material could not discharge easily .Axial pressure and velocity evenly distributed resulting in airflow of shattered room is short of axial mobile .This article provided a new method for structure optimization of inner flow field of rubbing and breaking machine , suggested directions about impro-ving the models , laid a theoretical foundation in order to optimize the efficiency of the aircraft .