Characteristic analysis of flow field and experimental investigation on traction force of weft yarns of auxiliary nozzle in an air-jet loom

Arising from the key issue in the process of weft insertion of auxiliary nozzles in an air-jet loom,flow field of the auxiliary nozzle for weft insertion was simulated with CFD software Fluent. The velocity distributions of the airflow centerline at the exit of the auxiliary nozzle are also obtained. In order to verify the rationality of the numerical result,the velocities of the airflow centerline at the exit of several kinds of auxiliary nozzles in an air-jet loom are attained under different air-supply pressures through the experimental test. Comparisons between these two results indicate that overall trend of speed change of the experimental result is basically consistent with the velocity curve of the numerical result. To a certain extent,it proves that it is feasible to conduct the numerical simulation on flow field of auxiliary nozzle for weft insertion by Fluent. The test of weft traction force on different kinds of yarns for two auxiliary nozzles is further obtained respectively. It can be concluded that single-hole auxiliary nozzle is characteristized by powerful jet,high stability and good cluster.