喷孔锥度对喷气织机环槽型辅助喷嘴性能的影响

Influence of Nozzle Taper on Performance of Annular Groove Auxiliary Nozzle of Air-Jet Loom

为提升引纬质量,课题组设计了一种环形槽型喷孔辅助喷嘴,并通过数值模拟探究辅助喷嘴结构对喷射性能的影响。课题组依据喷射出口面积等效原则,设计了3种环槽型辅助喷嘴,并分别建立了环形槽结合中心式辅助喷嘴的流场模型;利用FLUENT软件对建立的流场模型进行数值模拟,得到供气压力0.3MPa时不同喷孔锥度的各环槽型辅助喷嘴对称面上速度云图、出口流速中心线上速度分布曲线图、气耗量,以及距喷嘴出口20,50,70mm处截面速度分布图。结果表明:对同种环槽型辅助喷嘴,随着喷孔锥度增大,辅助喷嘴的喷射性能明显增强;喷孔锥度大于0°时,喷孔锥度增大各喷嘴出口处射流速度也随之增大。环槽型辅助喷嘴为喷气织机引纬提供了一种效率更高的方法。

In order to improve the quality of weft insertion,an auxiliary nozzle in the form of an annular groove nozzle was designed and the numerical simulation was carried out to explore the effect of the auxiliary nozzle structure on the jetting performance.According to the principle of equivalence of jet outlet area,three different annular groove auxiliary nozzles were designed;flow field models of different annular grooves combined with central auxiliary nozzles were established respectively;the above flow field models were numerically simulated by FLUENT software,and the velocity cloud diagram on the symmetry plane,the velocity distribution curve on the centerline of the outlet velocity,the gas consumption and the sectional velocity distribution diagram at 20,50,and 70 mm from the nozzle outlet were obtained of each annular groove nozzle with different nozzle taper at 0.3 MPa supply pressure.The results show that for the same annular groove type auxiliary nozzle,with the increase of nozzle taper,the spray performance of the auxiliary nozle is significantly enhanced;when the nozle taper is greater than 0°,the larger the nozzle taper is,the larger the jet velocity at the outlet of each type of nozzle.Annular-groove auxiliary nozle provides a more eficient method for weft insertion on air-jet looms.