摘要
以水刺加固喷嘴高速射流对聚合物纤维进行水力缠结加固成形的过程为研究对象,通过建立水刺加固喷嘴喷射流场理论模型,经过数值模拟研究了4个不同水刺加固喷嘴高压喷射流场的运动特征,并与粒子图像测速仪系统测试的结果进行了对比。结果表明:采用Realizable k-ε湍流模型描述水刺工艺水腔内喷嘴的喷射流场正确,建立的数值模拟计算求解方法有效,与实验测试值十分吻合;适当增大喷嘴喷口的高度,可使流体在喷嘴喷口轴向方向的速度增大;适当增大射流初始段的长度,可使流体的流量和压力增大,提高水刺非织造纤维网缠结效果;随着射流过渡段长度的增大,混合段(即过渡段和充分发展段)出口压力增大,喷射流体的速度增大,纤维网所受到的冲击力增大;适当减小喷嘴过渡段高度,混合段出口处压力增大,可以实现较大范围内喷射流体速度的增大,改善水刺非织造纤维网缠结效果。
Taking the hydroentanglement and reinforcement process of polymer fibers by high-speed jet of spunlacing nozzle as the research object,the motion characteristics of high-pressure jet flow field of four types of spunlacing nozzles were studied by numerical simulation based on the established jet flow field theoretical model of spunlacing nozzle and were compared with the test results of particle image velocimeter system.The results showed that the Realizable k-εturbulence model correctly described the jet flow field of the nozzle in the water chamber of spunlacing process and the established numerical simulation calculation method was effective and provided the values in good agreement with the experimental test values;the axial velocity of the fluid at nozzle ejector could be increased by appropriately increasing the height of the nozzle ejector;the flow rate and pressure of the fluid could be increased and the entanglement effect of spunlaced nonwoven fiber network could be improved by appropriately increasing the initial section length of the jet;the outlet pressure of the mixing section(i.e.transition section and fully developed section)increased,the jet fluid velocity increased,and the impact force on the fiber network increased with the increase of the length of the jet transition section;and the jet fluid velocity could be increased in a large range and the entanglement effect of the spunlaced nonwoven fiber network could be improved by appropriately reducing the height of the nozzle transition section and increasing the outlet pressure of the mixing section.
作者
赵博
ZHAO Bo(Zhongyuan University of Technology,Zhengzhou 450007)
出处
《合成纤维工业》
CAS
2023年第6期20-24,共5页
China Synthetic Fiber Industry
基金
河南省自然科学基金资助项目—面上项目(162300410343)
河南省高等学校重点科研项目(16A540009)。
关键词
水刺非织造布
喷嘴
流场模拟
验证
spunlaced non-woven fabric
nozzle
flow field simulation
verification
