Abstract: In order to fully understand the velocity distribution of jet flow of the main nozzle in an air-jet loom, which is used for optimizing the process parameters of weft insertion system, the numerical simulation based on weft insertion flow field of main nozzle is carried out by the computational fluid dynamics software called Fluent. The velocity distribution curve of the flow field centerline and the velocity distribution contour of the cross-sections which are perpendicular to the flow field centerline are obtained. In order to verify the rationality of numerical simulation, the speed of different points in the flow field has been got by the experiment. Finally by comparing the two results it’s indicated that experimental velocity is about 60m/s lower than simulative velocity at the outlet of the main nozzle, then the gap between them is shrinking as the flow field extends, and they are in good agreement since 70mm away from the outlet. So the simulative results deserve being referenced in practice.

Key words: main nozzle, flow field, Fluent, numerical simulation, air-jet loom