多场耦合作用下螺旋轴流泵磁流体密封热特性OA

To address the unreliability of traditional seals caused by unstable pulsating flow in helical axial-flow multiphase pumps,this paper innovatively proposes a ferrofluid shaft sealing technology for helical axial-flow pumps.Combining numerical simulations and experiments,the thermodynamic and magnetic characteristics of the sealing device are investigated.First,data interpolation between grid nodes is employed to achieve magnetic-fluid coupling.Subsequently,the energy equation is coupled to establish a thermal-flow-magnetic multi-field numerical model.The viscosity of the ferrofluid is precisely regulated based on its magneto-viscous and thermo-viscous properties.The effects of rotational speed,shaft diameter,magnetic force,and viscosity characteristics on the ferrofluid temperature are analyzed.The results indicate that both the viscosity and magnetic properties of the ferrofluid contribute to increased energy dissipation.Under large shaft diameter conditions,the ferrofluid temperature is more sensitive to rotational speed.It is concluded that the ferrofluid temperature is primarily governed by linear velocity.When the operating temperature of the ferrofluid reaches 80℃,the linear velocity should not exceed 18 m/s.Finally,a predictive function for ferrofluid temperature within the linear velocity range of 0～18 m/s is derived.This study provides a theoretical reference for designing ferrofluid sealing devices in helical axial-flow pumps.