Design of an ejector in carpet industry by the method of Tufting

In this paper a new ejector pump for using in textile and carpet knitting industries has been designed and optimized by numerical method. One of the customary methods in carpet knitting is tufting through which strings are deployed by fluid (air) and particular needles. In this study, a new method for sucking strings into the needles by employing air ejector has been proposed. Navier-Stokes equations for two-dimensional domain for a compressible turbulent steady flow have been solved. Furthermore, the Realizable k-ε method has been employed for the turbulent flow. The numerical method is verified by prior experimental data for similar ejector pump and good agreements are achieved. In this study, geometric parameters as length and divergence angle in mixing chamber, diffuser outlet diameter and initial inlet pressure are investigated. Numerical results suggest optimum values for divergence angle and length of the mixing chamber.