Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (10): 169-175.doi: 10.13475/j.fzxb.20210809907

• Machinery & Accessories • Previous Articles     Next Articles

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

SUN Jian1,2(), JIANG Boyi1,2, ZHANG Shoujing1,2, HU Sheng1,2   

  1. 1. School of Mechanical and Electrical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. Xi'an Key Laboratory of Modern Intelligent Textile Equipment, Xi'an, Shaanxi 710048, China
  • Received:2021-08-02 Revised:2022-03-15 Online:2022-10-15 Published:2022-10-28

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Abstract:

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.

Key words: foreign fiber sorter, nozzle structure, nozzle performance, numerical simulation, mass flow rate

CLC Number: 

  • TS112.7

Fig.1

Original nozzle model. (a) 3-D model of nozzle;(b) Nozzle size diagram"

Fig.2

Schematic diagram of optimized nozzle. (a) Nozzle of upper flaring nozzle;(b) Nozzle of lower flaring nozzle;(c) Nozzle of conical nozzle"

Fig.3

Schematic diagram of boundary conditions"

Fig.4

Position and velocity cloud map of 40 mm section of external air flow field"

Tab.1

Section velocity and inlet mass flow rate of upper flaring nozzle"

H1/mm A/mm V1/(m·s-1) V2/(m·s-1) Q/(g·s-1)
3.6 194.3 326.4 9.778
0.3 4.0 216.0 322.4 9.583
4.4 215.3 322.2 9.435
3.6 220.2 330.5 9.998
0.5 4.0 220.3 331.9 9.859
4.4 218.9 329.3 9.704
3.6 221.4 332.4 10.065
0.7 4.0 216.9 324.5 9.576
4.4 220.5 332.9 9.905
3.6 232.4 338.4 10.053
1.0 4.0 223.2 339.3 10.145
4.4 236.1 348.9 10.103

Fig.5

Velocity curve of upper flaring nozzle when H1=1.0 mm. (a) Velocity distribution curve at center line position of section;(b) Velocity attenuation curve of inner nozzle; (c) Velocity attenuation curve of outer nozzle"

Tab.2

Section velocity and inlet mass flow rate of lower flaring nozzle"

H2/mm B/mm V1/(m·s-1) V2/(m·s-1) Q/(g·s-1)
3.6 193.4 294.7 9.120
0.3 4.0 189.9 300.2 9.118
4.4 183.5 300.8 9.120
3.6 194.1 292.6 9.119
0.5 4.0 189.4 299.0 9.128
4.4 183.1 299.2 9.121
3.6 195.5 295.4 9.118
0.7 4.0 184.6 297.1 9.121
4.4 182.9 298.5 9.119
3.6 197.5 298.9 9.116
1.0 4.0 185.0 285.5 9.117
4.4 181.0 295.4 9.120

Fig.6

Velocity curve of lower flaring nozzle when H2=1.0 mm. (a) Velocity distribution curve at center line position of section;(b) Velocity attenuation curve of inner nozzle;(c) Velocity attenuation curve of outer nozzle"

Tab.3

Section velocity and inlet mass flow rate of conical nozzle"

C/mm V1/(m·s-1) V2/(m·s-1) Q/(g·s-1)
3.6 218.2 321.1 10.267
4.0 224.2 332.4 10.560
4.4 225.5 335.4 10.747

Fig.7

Velocity distribution curve at center line position of section of conical nozzle"

Tab.4

Section velocity and inlet mass flow rate of rectangular nozzles"

K值 V1/(m·s-1) V2/(m·s-1) Q/(g·s-1)
1 167.2 316.5 9.137
2 167.8 317.5 9.163
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