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The present study is concerned with numerical simulation of compressible air flow in a yarn duct of an interlacer and the relation between air flow and yarn entanglement. A nozzle of circular pipe of inner diameter d (<D) is mounted perpendicularly to the yarn duct of circular pipe of inner diameter D (d<D). The interlacer system is analyzed numerically using the high Reynolds number k−ε model. The dependence of compressible air flow on the ratio d /D is examined numerically and experimentally. When the average local Mach number at the entrance of the nozzle pipe reaches 0.5~0.71, the flow chokes immediately after passing the nozzle pipe. The limited Mach number at the entrance of the nozzle pipe depends on the flow in the nozzle pipe, namely the friction loss. Furthermore the strength and the number of yarn entanglement vary with d /D and become maximums at d /D≒0.5.

Characteristics of Compressible Air Flow in an Interlacer and Yarn Entanglement