异纤分拣机剔除喷管结构参数对其性能的影响

Influence of different nozzle structures and parameters on nozzle performance of foreign fiber sorters

为探究不同异纤分拣机剔除喷管结构及其参数对喷管性能的影响,采用数值模拟分析方法,对上扩口喷嘴、下扩口喷嘴、锥形喷嘴、矩形喷嘴4种剔除喷管喷嘴结构及参数的三维流场进行模拟仿真,得到入口压力0.6 MPa下剔除喷管入口质量流率、外部空气流场域内40 mm截面位置速度及内、外喷嘴位置速度衰减曲线。结果表明:除矩形喷嘴外,其余3种喷嘴结构均能提高喷管性能,其中上扩口喷嘴喷管性能相对最优,截面平均速度和最大速度相对原始喷管最大分别提升33.4%和12.9%;下扩口喷嘴喷管相对于原始喷管截面平均速度增大11.6%,且入口质量流率减少0.17%;锥形喷嘴喷管在整体速度分布上优于上扩口喷嘴喷管,但入口质量流率上升较大。

In order to investigate the influence of different nozzle structures and parameters on the nozzle performance of the foreign fiber sorters,nozzles with the upper flaring,lower flaring,conic and rectangular structures and parameters were analyzed by three dimensional fluid simulations.The mass flow rate at the nozzle inlet,the velocity at the 40 mm section in the external air flow field and the velocity attenuation curves at the inner and outer nozzles were obtained under the 0.6 MPa inlet pressure.The results show that the performance of the nozzle can be improved by the three nozzle structures mentioned above except the rectangular nozzle,and the performance of the upper flaring nozzle is the best,of which the average velocity and maximum velocity are 33.4%and 12.9%,respectively,higher than that of the original nozzle.Compared with the original nozzle,the average velocity of the lower flaring nozzle is increased by 11.6%,and the inlet mass flow rate decreased by 0.17%.The overall velocity distribution of the conical nozzle is better than that of the upper flaring nozzle,but with big increase of inlet mass flow rate.