In order to explore the differences between conventional and dual-feed-opening rotor spinning units (RSUs), this work compares the airflow characteristics of two RSU models utilizing a computational fluid dynamics simulation model with the accuracy verified by airflow behavior observation and air pressure measurement. The effect of two different opening roller speeds on the airflow field distribution of a dual-feed-opening model is also investigated. In addition, the yarn properties of six pure and blended yarns corresponding to the two RSU models are evaluated. The results reveal that the distributions of airflow velocity vector and air pressure in the two RSU models show a strong similarity under the same boundary conditions. However, the dual-feed-opening model possesses a centrosymmetric and more balanced airflow field distribution compared to the conventional model. In addition, the dual-feed-opening yarns show a superior performance in comparison to the conventional yarns. Furthermore, for the dual-feed-opening model, there are equivalent contributions of two separated opening and fiber transmission systems to the airflow field distribution and yarn formation. Compared to the configuration with the same two opening roller speeds, the dual-feed-opening model configured with two different opening roller speeds obtains an improved blended yarn performance with having few effects on the airflow characteristics. This strength of the dual-feed-opening RSU could facilitate the production of blended and fancy yarns employing the fibers with diverse properties. This study could provide some guidelines for the manufacture of rotor-spun yarns and the future design of RSUs.

为了探索常规和双喂入开口转杯纺纱单元 (RSU) 之间的差异，本工作利用计算流体动力学模拟模型比较了两种 RSU 模型的气流特性，并通过气流行为观察和气压测量验证了准确性. 还研究了两种不同的分梳辊速度对双喂入开松模型气流场分布的影响。此外，还评估了对应于两种 RSU 模型的六种纯纱和混纺纱的纱线特性。结果表明，在相同的边界条件下，两种 RSU 模型中气流速度矢量和气压的分布表现出很强的相似性。然而，与传统机型相比，双进料口机型具有中心对称且更平衡的气流场分布。此外，与传统纱线相比，双喂入开松纱线显示出优越的性能。此外，对于双喂入开松模型，两个分离的开松和纤维传输系统对气流场分布和纱线形成有相同的贡献。与具有相同两个开松辊速度的配置相比，配置有两个不同开松辊速度的双喂入开松模型在对气流特性影响很小的情况下获得了改进的混纺纱线性能。双喂入开松 RSU 的这种强度可以促进使用具有不同特性的纤维生产混纺和花式纱线。