Abstract: In this paper，to analyze the characters of the flow field of the auxiliary nozzle，an analysis software Fluent based on Computational Fluid Dynamics(CFD) is used to investigate the three-dimensional flow field of an auxiliary nozzle of an air-jet loom. The flow velocity change along with the center line and the pressure change under 0.28MPa source supply pressure are systematically analyzed. Similarly，a detailed flow velocity distribution with different source supply pressures is also calculated. Results showed that the flow velocity at the nozzle exit is up to 404m/s when the supply pressure is 0.28MPa and there is a negative pressure region near the nozzle exit. Furthermore，numerical date indicate that the flow velocity at the nozzle exit will increase about 50m/s for each 0.1MPa increment of supply pressure. Finally，the comparison between the present numerical results and other investigators’ experimental results has been made and shows that the numerical results are in good agreement with the experimental ones.

Key words: air-jet loom , auxiliary nozzle , CFD , Fluent , flow field