Characteristics of Compressible Air Flow in an Interlacer and Yarn Entanglement
Characteristics of Compressible Air Flow in an Interlacer and Yarn Entanglement
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交织机中可压缩空气的流动特性和纱线缠结
DOI：
10.4188/jte.52.121
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发表时间：
2006
影响因子：
--
通讯作者：
Syunzo Naito
中科院分区：
文献类型：
--
作者：
K. Tokunaga;Koichi Murakami;M. Kitamura;S. Nomura;Syunzo Naito
本文对可压缩空气在交织机纱道内的流动进行了数值模拟，并分析了空气流动与纱线缠结的关系。内径为d （< d）的圆管喷嘴垂直安装在内径为d （d< d）的圆管纱管上。采用高雷诺数k−ε模型对间束系统进行了数值分析。通过数值和实验研究了可压缩空气流量与d / d比的关系。当喷管入口处局部平均马赫数达到0.5~0.71时，气流通过喷管后立即发生阻塞。喷管入口处的有限马赫数取决于喷管内的流量，即摩擦损失。纱线的缠结强度和缠结数随d / d的≒0.5而变化，并在d / d≒0.5时达到最大值。
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.