单板干燥机喷箱外流场仿真及换热特性研究  

Simulation of Outer Flow Field and Heat Transfer Characteristics of Veneer Dryer

作　　者：姜新波[1] 郭晨昊 于丹丹 JIANG Xinbo;GUO Chenhao;YU Dandan(College of Mechanical and Electrical Engineering,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学机电工程学院,哈尔滨150040

出　　处：《森林工程》2021年第5期82-89,共8页Forest Engineering

基　　金：黑龙江省应用技术研究与开发计划项目(GA19A402)。

摘　　要：为研究喷气式单板干燥机喷箱喷孔结构对喷箱外流场换热效果的影响,利用Fluent软件对比圆孔式和圆形翻边式两种喷孔所喷出气流在单板表面的冲击换热特性,并针对对流换热特性较好的圆形翻边喷孔进行进一步研究,系统分析射流喷距H、喷孔喷出端直径d、射流速度v和射流温度T对圆形翻边喷孔射流对流换热的影响。研究结果表明,圆形翻边喷孔能够改善射流与单板间的对流换热均匀性,提高传热效率;热气流与单板间换热能力分别与射流速度和射流温度存在正相关关系;射流喷距和喷孔喷出端直径与对流换热系数之间不存在单一的线性关系,存在一个喷距范围,使射流与单板间的对流换热强度和对流换热均匀性达到最优。本研究为单板干燥机喷箱的设计提供理论依据。In order to study the effect of the nozzle structure of the spray box on the convective heat transfer between the hot air and the veneer in the air-jet veneer dryer,the impact heat transfer characteristics of the air flow from the circular spray hole and round flanging spray hole on the veneer surface were studied by Fluent software.The effects of jet spray distance H,nozzle outlet diameter d,jet velocity v,jet temperature T on the convective heat transfer of the round flanging spray hole were systematically analyzed.The results showed that the round flanging spray hole can improve the convective heat transfer uniformity between the jet and the plate and improve the heat transfer efficiency.The heat transfer capacity between hot air flow and veneer had a positive correlation with jet velocity and jet temperature respectively.There was no single linear relationship between the jet spray distance,the nozzle outlet diameter and the convective heat transfer coefficient,and there was a spray distance range,so that the convective heat transfer intensity and convective heat transfer uniformity between the jet and the single plate were optimized.This paper provided a theoretical basis for the design of veneer dryer spray box.

关 键 词：单板干燥机 对流换热 数值模拟 圆形翻边喷孔 Fluent仿真 

分 类 号：TS642[轻工技术与工程]