基于FLUENT的压力缝筛波纹形状的改进机制  

Improving mechanism of pressure screen contoured slot shape based on FLUENT

作　　者：陈永利[1] 张健[1] 张辉[1] 

机构地区：[1]南京林业大学,江苏省制浆造纸科学与技术重点实验室,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2012年第6期105-109,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：南京林业大学江苏省制浆造纸科学与技术重点实验室开放基金(201001);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：为了使压力筛中的浆料更好地导向筛缝和提高筛选能力,必须减小或消除压力缝筛波纹处的涡流。利用UG软件对筛缝处的局部流场造型,运用FLUENT软件对筛缝处的流场进行数值模拟;分析比较了不同造型的波纹形状,得到流场的压力、湍流动能和速度的分布云图。结果表明:在实验条件下,筛缝入口倒角值越大,筛缝入口处的浆料流体流线形态越平滑;当倒角半径增至0.4 mm时,涡流状态消失;波纹筛缝入口两侧的圆倒角半径均为0.5 mm时,浆料流动形态最好,通过率最大,比改进前提高了12.4%。In order to turn the pulp in the pressure screen turn into the slot more easily and to improve the screening ability,the vortex near the contoured slot should be reduced or eliminated.The local flow field model of the screen slot was drawn with UG software,and then the flow field model was simulated with FLUENT software.Different improvements of the contoured slot shape were analyzed,and finally the detail distribution contours of the pressure,turbulent kinetic energy and velocity magnitude in the contoured slot field were obtained.The results showed that in the experimental condition the larger the screen slot chamfering angle was,the smoother the fluid flow near the screen slot was.When chamfering angle radius increased to 0.4 mm,the vortex disappeared.When the chamfering angle radiuses of the contoured slot entrance on both sides were 0.5 mm,the pulp flow form was the best,the passage ratio was the largest and improved 12.4 % higher than before.

关 键 词：压力筛 波纹 FLUENT 数值模拟 

分 类 号：TS733.8[轻工技术与工程—制浆造纸工程] TQ019[化学工程]