喷气织机主喷嘴内部流场的数值计算

由于主喷嘴结构较为复杂，加工制造精度高，难以简单地采用实验方法测量其内部的流场特征，所以采用数值计算的方法，解析主喷嘴内部轴向和径向的气流速度分布规律，并比较不同供气压力条件下流场的变化情况。研究结果表明，主喷嘴内部气流非常复杂，既存在超音速区域，又存在回流现象，并且当供气压力过大时回流现象直接影响到引纬过程，因此供气压力设置范围应确保为0.2～0.4 MPa，研究所得对喷气织机织造工艺的优化具有较好的指导作用。

Numerical simulation of flow field in main nozzle of air jet loom

Due to the complicated structure and high accuracy of the main nozzle,its air field characteristics can not be tested directly,so the numerical simulation is applied in this paper.The distribution of the air flow speed along axial and radial direction in the main nozzle is investigated,and flow fields under various supply pressures are also studied.The results indicate that the flow field in the main nozzle is very complicated,including the supersonic area and the backflow phenomenon,and if the supply pressure is too high,the backflow phenomenon will influence the weft insertion directly,so the supply pressure should be ensured at the range of 0.2-0.4 MPa.This study is helpful to the optimization of air jet loom weaving process.