减阻效应下泵中纤维取向OA

To accurately describe the fiber orientation characteristics in centrifugal pumps under the drag reduction effect and thereby improve the pump efficiency,the existence of the drag reduction effect was verified through hydraulic characteristic experiments.Subsequently,a high-speed camera was employed to capture images of fibers in the fluid,and fiber-related data were collected within the monitoring area to analyze the overall and local fiber orientation.Meanwhile,ANSYS and EDEMsoft-ware were used to simulate the liquid phase and solid phase,respectively,and the coupling solution of the solid－liquid two-phase flow was conducted to calculate the pressure field,velocity field,and turbu-lent kinetic energy in the flow field.Thereafter,the fiber orientation characteristics obtained from ex-periments were cross-validated with the flow field states derived from simulations.The research results show that near the base circle,fibers tend to align with the tangent direction of the base circle.There are differences in fiber orientation tendencies at different positions,with a higher proportion of fibers oriented at small angles on the left and right sides compared to the upper and lower positions.The fiber orientation distribution tends to be discrete under the influence of structures such as impellers or volute tongues.Fibers exhibit obvious orientation tendencies under the drag reduction effect,and the prefe-rential orientation of fibers drives the occurrence of the drag reduction effect.Furthermore,the align-ment order of fiber orientation is positively correlated with the stability of the flow field.