Analysis of Oil Viscous Drag Loss of Deep-sea Motor Based on CFD Method

Liu, Jiatong; Yan, Liang; He, Xinghua; Zhou, Yuchen; Yu, Zihao

doi:10.1109/iciea54703.2022.10006320

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…As the speed increases, the flow field in the air gap is almost turbulent, with a small part being the transitional flow. There is an energy exchange between fluid particles, so the empirical formula is not applicable for calculating viscous friction loss here [22]. For the calculation of air gap viscous friction loss, this section is provided by fluid simulation.…”

Section: Total Efficiency Model Of the Hydraulic Power Sourcementioning

confidence: 99%

“…Liu et al [22] modeled the air gap flow field of a deep-sea oil-filled motor and analyzed the effects of air gap thickness, motor speed, oil viscosity and rotor eccentricity on the viscous drag loss, which provided a simulation method for the study of the deep-sea motor. Zou et al [23] calculated the viscous drag loss in the air gap of a brushless DC motor with different sea depth pressures and the magnetic loss of the silicon steel sheet core by using the CFD method and finite element method, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Efficiency Characteristics of a Deep-Sea Hydraulic Power Source

Li,

Guo,

et al. 2023

Lubricants

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Deep-sea submersibles carry limited energy sources, so a high efficiency of the equipment is required to improve endurance. In the deep-sea environment, the hydraulic power source is filled with oil, which causes structural deformation of the power source and changes in the physical properties of the medium, leading to unknown changes in the efficiency characteristics of the power source. In order to explore the efficiency characteristics of the deep-sea hydraulic power source composed of a gear pump and a DC (direct current) brushless motor in a variable sea depth environment, we undertook the following. First, considering the effects of seawater pressure and temperature on the physical properties of the medium and the radial clearance deformation of the gear pump, a mathematical model for the total efficiency of the hydraulic power source was established. The results indicate that the deformation of the pump body is mainly determined by the seawater pressure and working pressure. Subsequently, by analyzing the effects of the two factors on the efficiency of the power source, respectively, when the oil temperature range is large enough, the total efficiency of the power source will increase and then decrease under six sea depths; the total efficiency of the power source decreases with the increase in the rotational speed. However, in a land environment, the trend of the efficiency characteristics of the power source is opposite to that of the remaining six deep-sea environments, both in terms of oil temperature and rotational speed. Finally, the efficiency trend of the power source with changes in sea depth under rated conditions was obtained. Under different sea depth ranges, the optimal operating oil temperatures and suitable rotational speed ranges of the power source could be obtained. This paper could provide a certain theoretical basis for the research and development of deep-sea equipment.

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Section: Total Efficiency Model Of the Hydraulic Power Sourcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Efficiency Characteristics of a Deep-Sea Hydraulic Power Source

Li,

Guo,

et al. 2023

Lubricants

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“…Consequently, the synchronization performance of line start synchronous machines may be impacted. In the existing literature, one can discover studies that consider damping losses and optimize designs accordingly [2,[9][10][11]. In [9], a high-power density pump motor is designed by estimating the damping loss analytically.…”

Section: Introductionmentioning

confidence: 99%

“…However, the calculated drag loss is deviated by 14% on experimental validation, which is related to the slotted structure of the stator. In [10], CFD is used to investigate the air gap thickness variation on fluid damping loss while designing a PM machine including eccentricity. In another study [11], a PM motor is designed for a turbine application where the fluid goes through the motor, i.e., the water travels through the air gap.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Role of Stator Slot Indents in Minimizing Flooded Motor Fluid Damping Loss

Tekgun,

Tekgun

2023

Machines

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This research examines how fluid damping loss affects the operation of a two-pole, 5.5 HP (4 kW) induction machine (IM) within the context of different slot opening configurations developed for downhole water pump applications. Since these motors operate with their cavities filled with fluid, the variations in fluid viscosity and density, compared to air, result in the occurrence of damping losses. Furthermore, this loss can be attributed to the motor’s stator and rotor surface geometry, as the liquid within the motor cavity moves unrestrictedly within the motor housing. This study involves the examination of the damping loss in a 24-slot IM under different stator slot indentations. The investigation utilizes computational fluid dynamics (CFD) finite element analysis (FEA) and is subsequently validated through experiments. The aim of this work is to emphasize the significance of fluid damping loss in submerged machines. Results reveal that the damping loss exceeds 8% of the motor output power when the stator surface has indentations, and it diminishes to 3.2% of the output power when a custom wedge structure is employed to eliminate these surface indentations.

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