多激励射流作用下的纤维束气力传输机理研究

纤维束材料作为基础材料被广泛应用于建筑、船舶、化工管道、汽车、航空、风力发电等领域。目前纤维束主要采用气力输送进行织造，在多个激励射流作用下在30--60毫秒内通过由异型筘和经纱构成的狭小通道完成气力传输过程。但由于纤维束运动数学模型和激励射流场与纤维束之间的耦合作用机理等关键科学问题没有得到有效解决，极大地制约了纤维束气力传输质量和效率。本研究拟以喷气织机引纬流道内的纤维束-气流耦合运动为研究对象，通过理论分析和实验研究，建立气固两相耦合数学模型及气固双向耦合数值计算方法，通过数值模拟和实验研究对多激励射流场特性、纤维束在射流场中气力传输特性开展研究，建立射流场流动参数与纤维束运行特性之间的映射关系，为高性能纤维束织造提供理论依据和技术基础。

As a basic material, fiber bundles are widely used in construction, shipbuilding, chemical pipelines, automotive, aerospace, wind power generation and some other fields. At present, the weaving of fiber bundles mainly depends on pneumatic conveying. Under the effect of multiple incentive jet, the fiber bundles pass through a constricted passage consists of reeds and warps in 30-60 ms to complete its pneumatic transfer process. However, the unresolved yet crucial problems of mathematical model constructing of the fiber bundles and the coupling mechanism between the incentive jet flow and fiber bundle are still great obstacles for the development of fiber bundles’ pneumatic conveying, especially in quality and efficiency. This study focuses on the air- fiber bundle coupling within the weft insertion channel of the air-jet looms. Theoretical analysis combined with experimental study is performed to build the air-solid coupling mathematical model and its two-way coupling numerical method. Furthermore, numerical simulation combined with experimental study is taken to learn the characteristics of the multi-jet excitation field as well as the pneumatic transmission characteristics of the fiber bundle in jet field. At last, this research build up a mapping relationship between jet flow parameters and the motion characteristics of fiber bundle, which provides a theoretical basis and technical foundation for high-performance fiber bundles weaving.