Research on wear characteristics induced by flowing microparticles in rotor cup

Abstract

Wear at the inner surface of the rotor cup by granular impurities could adversely affect the slip of fibers and increase yarns’ hairiness. Therefore, understanding the mechanism of wear formation due to the moving granular impurities and the wear characteristics at the inner surface of the rotor cup is of great significance for the improvement of yarn quality. This paper numerically explores the mapping relationship between the motion characteristics of particles (i.e. spherical impurities) and the wear characteristics of the rotor cup via the combination of computational fluid dynamics (CFD) and the discrete element method (DEM). The simulation results are first validated against the experimentally obtained microscopic view of the surface of the discarded rotor cup. After that, the wear characteristics of the rotor cup under different rotating speeds and angles of the transfer channel are analyzed. The results show that the most serious cutting and impact wear is found at the rotor groove, followed by the first collision position of the slip surface. The cutting and impact wear in the rotor groove are positively correlated with the rotating speed, while are not affected by the angle of the transfer channel. The cutting and impact wear at the first collision position of the slip surface are negatively correlated with the rotating speed and the angle of the transfer channel. However, the impact and cutting wear at the first collision position is no longer affected significantly by the rotating speed when it is above 90000 rpm. Increasing the rotating speed and the angle of the transfer channel is found to reduce the second wear area on the slip surface of the rotor cup.

Keywords:

• Rotor spinning
• air-solid coupling
• granular impurity
• wear

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by National Natural Science Foundation of China [grant number 51976200]; the Top-notch Talent Support Program of Zhejiang Province [grant number 2019R51002]; Science Foundation of Zhejiang Sci-Tech University (ZSTU) under Grant No. 22022018-Y; and Natural Science Foundation of Zhejiang Province (No. LQ20E060009).