Abstract

Due to having more complicated inner structural features and obvious influence on the air-jet performance arising from the acceleration tube, the structural optimization of the main nozzle for an air-jet loom is still a difficult problem. Naturally, traditional design method for the nozzle will still prolong the time of type approval and increase the design cost. In this paper, orthogonal test method and numerical simulation are utilized to optimize the structure of subsonic acceleration zone; the optimal structure parameters matched with different air supply pressure are obtained. Results indicate that the external diameter of the nozzle needle has a negative influence on the airflow velocity whereas the diameter of the acceleration tube presents positive effect. Both of them play an important influence on the flow field of the main nozzle field and the other structural parameters have little influence on that. This research is also benefit for structural optimization of the main nozzle and energy conservation of an air-jet loom.

Keywords

Air-jet loom, Main nozzle, Structural optimization, Flow field, Orthogonal test method, Rectification process, Flow field, Jet performance, Acceleration tube, Numerical integration, Adiabatic pipe flow, Weft yarn, Weft insertion, Axial length, Needle tip