Abstract:

In order to find optimal structure of the auxiliary nozzle in an air-jet loom to improve its comprehensive performance, a 3-D model of the auxiliary nozzle is developed, and the CFD software Fluent is used to digitally simulate the flow field of the auxiliary nozzle for weft insertion. When the supple air pressure is 0.3Mpa, the velocity distributions curve of the flow centerline at the exit of the auxiliary nozzle, the inlet mass flow rate, and the velocity distributions section which is 40mm from the exit of the auxiliary nozzle are obtained. In order to verify the optimal structure design, the weft insertion stability, the energy consumption and the maximum flow rate are used to synthetically analyze. Results show that the single-hole auxiliary nozzle with a 6 degree angle performs best which increases the maximum flow rate and the weft insertion stability by 4.4% and 36.7%; the rectangle-hole auxiliary nozzle with a length-width ratio of about 3.3 which improves the weft insertion stability by 7.3% is the optimal model; according to the above three indicators, the optimal model of 2-hole auxiliary nozzle under the corresponding indicator is obtained for different requirements of the actual weft insertion.