木材干燥室集中换气时进排气孔气流的均匀性模拟  

Investigation of airflow uniformity at air-exchange device in drying kiln by numerical simulation

作　　者：杨雪[1] 陈广元[1,2] 冯立宁[1] 李建荣[1] 

机构地区：[1]东北林业大学材料科学与工程学院 [2]东北林业大学生物质材料科学与技术教育部重点实验室

出　　处：《北京林业大学学报》2011年第4期113-117,共5页Journal of Beijing Forestry University

基　　金："948"国家林业局引进项目(2008-4-70);东北林业大学研究生论文资助项目(GRAM09);国家自然科学基金项目(30871981)

摘　　要：为解决木材干燥室强制集中换气装置进排气道孔口气流的均匀性问题,采用理论分析和Fluent数值模拟方法,对进排气道的进排孔口气流流速、流量等进行数值模拟分析和计算,得到了满足生产实际要求的孔口半径和分布。结果表明:进气道各孔口的质量流量差小于5.1%,排气道各孔口的质量流量差小于7.3%,二者均小于质量流量偏差(10%),能保证进排气道各孔口的气流均匀分布;揭示了进排气道末端到入口端的孔口半径分布规律,得到进排气孔半径的二次分布曲线。This reasearch solves the uniformity of the airflow through orifices in the inlet and outlet ducts of the wood drying compulsory centralize air-exchange device . The optimal diameters and distribution of the orifices were obtained by examining the air flux and velocity at the inlet and outlet ducts using the combination of the theoretical analysis and numerical simulation （ CFD）. The results indicated that the difference of air flux in the inlet orifices was less than 5. 1% , while the difference of air flux in the outlet orifices was less than 7.3%. Since both of the differences were less than 10% , it was ensured that the uniform airflow distributions in the inlet and outlet orifices were achieved. In addition, the orifice radius distributions from the end to the beginning of the inlet and outlet ducts were examined. Two quadratic distribution curves of the orifice radius for the air inlet and outlet ducts were developed.

关 键 词：木材干燥 强制集中换气 气流均匀性 进排气道 计算流体力学 

分 类 号：TS652[轻工技术与工程]