印染热定型机风道流场分析与试验研究

Analysis and Experimental Study on the Flow Field Characteristics in the Air Duct of Printing and Dyeing Heat-setting Machine

针对现有印染热定型机风道风嘴处气流速度不均匀现象,利用Fluent软件对风道内部三维流场进行数值模拟,获得了风道风嘴处气流速度矢量图、速度变化曲线图以及风道内部压力变化曲线图,着重分析了风道的倾斜角度及风嘴高度对气流速度的影响。研究结果表明：风嘴高度对风嘴处气流速度方向影响较大,而风道的倾斜角度对风嘴处气流速度均匀性影响较小,但对风嘴处气流速度大小影响较大;据此得出风嘴高度在12mm、风道端面积与风嘴总出风面积相等时,风道流场更有利于提升热定型效率及质量。试验验证了模型的正确性。该研究可为印染热定型机风道的结构优化设计及改善定型效果提供理论依据。

In order to solve the uneven air flow velocity in the tuyere of the air duct of existing printing and dyeing heat-setting machine,the Fluent software was used to conduct numerical simulation for the internal three-dimensional flow field of air duct to obtain the vector diagram for airflow speed at tuyere of the air duct,velocity change curve diagram and curve diagram for internal pressure changes of air duct;the influences of tilt angle of air duct and tuyere height on airflow velocity were mainly analyzed.The results indicates that the tuyere height has a significant influence on its air flow direction,while the tilt angle of air duct has a small impact on the velocity uniformity at tuyere;but it has a great impact on the magnitude of the airflow velocity at air duct.Based on the analytical result,it can verify that when the tuyere height is 12 mm and the air duct area is equal to the total air-out area oftuyere,the flow field of air duct can help to better improve the heat-setting efficiency and quality.The experiment verified the correctness of the model.The study can provide the theoretical basis for the optimal structure design of air duct of printing and dyeing heat-setting machine as well as the improvement of setting result.