Abstract:

In order to deeply understand the properties of weft inaertion flow dield of auxiliary nozzle and the effects of correlative structure parameter, and further provide basis for improving the craftwork of weft insertion, the flow field model of a combination of auxiliary nozzle and profiled reed is built a ccording to the actual condition of weft insertion. The numerical simulation is carried out by the computational fluid dynamics software called Fluent. The velocity distribution curve of the combinational flow field centerline is obtained and the rationality of numerical simulation is verified by experiment. On this basis, further research about the effect of the the underlip obliquity of profiled reed and the distance between auxiliary nozzle and profiled reed on the combinational flow field is implemented. The results showed that experimental velocity is lower than simulative velocity at the outlet of auxiliary nozzle, but they are in good agreement as a whole. When the air supply pressure is 0.3 MPa and 0.4 MPa, the air velocity performance of 12 degrees and 3 degrees of the underlip obliquity is optimal, respectively. Moreover, the suitable distance between auxiliary nozzle and profiled reed is 9 mm or 10 mm.

Key words: auxiliary nozzle, profiled reed, numerical simulation, flow field, air-jet loom