喷气织机辅助喷嘴结构参数对流场特性的影响

doi:10.13475/j.fzxb.20181103007

摘要/Abstract

摘要：

为降低辅助喷嘴能耗,增强辅喷气流的集束性,提高生产效率和织物质量,分析了辅助喷嘴结构参数和供气压力对射流特性的影响。运用流体动力学软件Fluent对不同供气压力下单圆孔、正三角形孔和星形孔3种典型辅助喷嘴结构的三维流场模型进行数值模拟,得到在0.2~0.4 MPa供气压力下3种辅助喷嘴对称面的速度云图、中心轴线速度、耗气量及引纬速度平稳性,提出了评定辅助喷嘴综合性能的方法。并将单圆孔辅助喷嘴数值计算得到的中心线速度和径向速度与实验值进行了比较,验证了数值仿真结果的正确性。结果表明,当供气压力相同时,星形孔辅助喷嘴气流集束性、引纬平稳性最好,耗气量小,综合性能最优。

关键词: 喷气织机, 辅助喷嘴, 异形筘, 数值模拟, 星形喷嘴

Abstract:

In order to reduce the energy consumption of the auxiliary nozzle, enhance the bundling of the air jet and improve the production efficiency and fabric quality, the influences of structural parameters of the auxiliary nozzle and the supply pressure on the characteristics of flow field were studied. The numerical simulation of three-dimensional flow field model were carried by fluid dynamics software Fluent. Three typical auxiliary nozzle structures under different gas supply pressures were investigated, such as the single circular hole, regular triangular hole and star hole. The velocity contours of the symmetry planes, the central axis speed, the air consumption and the weft insertion stability were acquired under the air supply pressure of 0.2 MPa to 0.4 MPa. The numerical results of the central line velocity and the radial velocity of the single circular hole were verified by experiment. Comparisons between these two results indicate that the overall trend of speed change is consistent with the experimental results. On this basis, the influence of different orifice type auxiliary nozzles on the flow field was explored. The results showed that when the air supply pressure is same, the star-hole auxiliary nozzle has better airflow bundling, better weft insertion stability and less air consumption.

Key words: air jet loom, auxiliary nozzle, profiled reed, numerical simulation, star hole

中图分类号:

TS103.3

李斯湖, 沈敏, 白聪, 陈亮. 喷气织机辅助喷嘴结构参数对流场特性的影响[J]. 纺织学报, 2019, 40(11): 161-167.

LI Sihu, SHEN Min, BAI Cong, CHEN Liang. Influence of structure parameter of auxiliary nozzle in air-jet loom on characteristics of flow field[J]. Journal of Textile Research, 2019, 40(11): 161-167.

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压力P/ MPa	总压P₁/ MPa	静压P₂/ Pa	湍动能κ/ (m²·s^-2)	湍动能耗散率 ε/(m²·s^-2)
0.2	0.2	198 366	5.7	9 942.8
0.3	0.3	297 554	5.1	8 480.5
0.4	0.4	396 703	4.8	7 724.4

速度/(m·s^-1)	等效圆直径/mm
速度/(m·s^-1)	数值模拟	文献[4]实验值
100	3.1	3.5
80	4.6	4.5
60	6.5	6.7
40	8.5	9.5
20	10.0	12.5

孔形	最大速度/(m·s^-1)	耗气量/(m³·h^-1)
单圆孔	432	1.357
正三角形孔	457	1.380
星形孔	497	1.215

孔形	不同压力下等效圆半径
孔形	0.3 MPa	0.4 MPa
单圆孔	1.45	1.82
正三角形孔	1.54	1.96
星形孔	1.92	2.12