喷气织机辅助喷嘴喷孔结构优化设计

为寻求喷气织机辅助喷嘴的最优结构来改善辅助喷嘴引纬的综合性能，建立辅助喷嘴的三维模型，利用 ＣＦＤ 软件的Ｆｌｕｅｎｔ 对辅助喷嘴引纬流场进行值模拟，得到0.3ＭＰａ 供气压力下辅助喷嘴出口射流中心线的速度曲线、辅助喷嘴入口的质量流、以及距离辅助喷嘴出口４０ ｍｍ 处截面上的速度分布。为验证辅助喷嘴结构的优化设计，通过引纬平稳性、能耗和最大流速进行综合分析。结果表明：锥角为６°的单孔辅助喷嘴综合性能最优，最大流速和引纬平稳性分别提高了4.4％和36.7％；长宽比为3.3 左右的矩形孔辅助喷嘴综合性能最优，引纬平稳性提高了7.3％；双孔辅助喷嘴根据上述３ 种指标获得对应指标下的最优组合以满足实际引纬的不同要求。

Structure optimization design of auxiliary nozzle for air-jet loom

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.