采用射流冷却的撕碎机刀具热特性仿真分析

Simulation analysis of thermal characteristics of shredder tool with jet cooling

针对撕碎机刀具长时间工作后因温度过高而导致其使用寿命下降的问题,将射流冷却技术应用了到撕碎机刀具中,通过冷却介质冲击撕碎机刀具表面进行了强制对流换热,从而降低了刀具温度。提出了一种新型撕碎机刀具结构,并基于该结构建立了在空气和水两种不同射流介质下的三维冷却模型;利用Fluent软件,选择合理的计算区域和边界条件,采用标准k-ε湍流模型,分析了不同冷却方式对撕碎机刀具热特性的影响。研究结果表明:该冷却系统采用水射流冷却能有效控制刀具温升,改善刀具温度的不均匀性;不同射流口压力下刀具的热特性仿真研究,可指导实际撕碎机刀具冷却系统参数的选取。

Aiming at the problem that the service life of the shredder tool decreased due to the high temperature after working for a long time,the jet cooling technology was applied to the shredder tool,the shredder tool was impacted with cooling medium and its temperature was re-duced by forced convection heat transfer.A three-dimensional cooling model under two different jet media,air and water,were established based on a new shredder tool structure,the influence of different cooling methods on the thermal characteristics of the shredder tool was ana-lyzed by selecting the reasonable calculation area,boundary conditions and the standard k-εturbulence model with Fluent software.The re-sults show that the cooling system can control the temperature rise of the tool effectively and improve the non-uniformity of the tool tempera-ture,with water jet cooling.The simulation of the thermal characteristics of the tool under different pressure can guide the selection of the pa-rameters of the actual shredder tool cooling system.