Numerical analysis of flows in main nozzle with convex point in local needle and acceleration tube

Abstract

When the thin weft yarn through the slightness acceleration tube, the weft may drift in the cavity due to the turbulence flow in the main nozzle. In order to analyse the turbulence influence during weft insertion, a kind of new main nozzle is designed by adding convex point in local needle and inside the acceleration tube. This paper focus on a numerical analysis of transonic/supersonic flows in the new main nozzle with a three-dimensional model. A compressible Reynolds Average Navier-Strokes method is used. The pressure and velocity along the center line of the main nozzle are obtained by changing the air tank pressures and number of air diversion groove.