短纤维链板式松弛热定型机内部流场测试及数值模拟

摘要

A numerical calculation model was founded on partial actual test data of flow field in chain plate type relaxation heat setting machine for staple fiber. The computational fluid dynamics software Fluent was adopted to analyze the numerical result of dryer box unit. The results showed that the chain plate type relaxation heat setting machine did not have a reasonable opening rate of air distribution plate, leading to an uneven flow rate perpendicular to chain plate motion in dryer which resulted in the uneven drying effect. The obvious velocity component parallel with the chain plate motion in the dryer flow field, which was beneficial to enhancing the convective mass transfer effect, resulted from the centrifugal force of the fan and the diversion effect of the volute. The numerical calculation method of the model produced the data similar to the actural test results. The numerical analytical results can be used as the preference for the structure optimization design of chain plate type relaxation heat setting machine for staple fiber, especially for the design of air distribution plate openings and fan volute.%在对短纤维链板式松弛热定型机内气体流场部分实测数据的基础上,建立了数值计算模型,利用流体动力学软件Fluent对干燥机箱体单元进行了数值模拟分析.结果表明:所研究短纤维链板式松弛热定型机的匀风板开孔率布置不合理,使得干燥机内垂直于链板运动方向流速不均匀,导致干燥效果的不均匀；由于风机的离心力及蜗壳的导流作用,使得干燥机流场具有明显链板移动方向速度分量,该分量有助于加强干燥过程中的对流传质效果.所建模型的数值计算方法与实际测试结果相近,数值分析结果可以用来作为短纤维链板式松弛热定型机结构优化设计,尤其是匀风板开孔和风机蜗壳的设计的依据.