Rotor spun composite yarn shows compound performances when combined with staple fibres and filaments, such as excellent hand feeling as well as extreme elasticity and strength. Air characteristics including pressure and speed are critical factors of the rotor spun composite yarn spinning process. In this paper, air flow characteristics in a rotor composite yarn spinning unit are simulated and analysed by Ansys, and then verified by experiments. The results show that with the same spinning conditions, static pressure within the filament guide tube is lowest: -9 kPa and in rotor around -5 kPa. The speed of the airstream accelerates from the transfer channel inlet to the outlet, and reaches the largest value of 386 m/s at the outlet. As the rotor speed increases, the airflow velocity increases; the static pressure decreases; the breaking strength and CV of the composite yarn increase, and the breaking elongation and hairiness decrease according to the experiment results.
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机译：当与短纤维和长丝结合使用时，转杯纺复合纱表现出复合性能，例如出色的手感以及极高的弹性和强度。包括压力和速度在内的空气特性是转杯纺复合纱纺丝工艺的关键因素。本文通过Ansys对转杯复合纱纺纱单元中的空气流动特性进行了仿真和分析，然后通过实验进行了验证。结果表明，在相同的纺丝条件下，细丝导管内的静压力最低：-9 kPa，转子中的静压力约为-5 kPa。气流的速度从传输通道入口加速到出口，并在出口达到386 m / s的最大值。随着转子速度的增加，气流速度也增加。静压降低;根据实验结果，复合纱线的断裂强度和CV增加，断裂伸长率和毛羽降低。
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