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.
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