3D Two-way coupled TEHD analysis on the lubricating characteristics of thrust bearings in pump-turbine units by combining CFD and FEA

Zhai, Liming; Luo, Yongyao; Wang, Zhengwei; Liu, Xin

doi:10.3901/cjme.2015.0922.113

Cited by 17 publications

(16 citation statements)

References 17 publications

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“…In this condition, the automatic wall treatment model based on k-ω equations is embedded into a wall equation with a low Reynolds number in the near-wall region, which contributes to the avoidance of excessive predictions for eddy viscosity. Thus, in this paper, the shear-stress transport (SST) k-ω turbulence model [17,[23][24][25][26][27][28] is selected to simulate the flow characteristics of flow fields.…”

Section: Computing Methods Of Flow Fieldsmentioning

confidence: 99%

“…The time step and the total time obtained by finite element analysis are consistent with those of actual flow fields. Boundary conditions of the impeller blade model involve structural constraints and loads [25][26][27]30,32,33]. Finite element calculation requires enough constraints to constrain the motion of the structure and prevent the rigid body displacement of the structure.…”

Section: Structure Models and Boundary Conditionsmentioning

confidence: 99%

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Study into the Improvement of Dynamic Stress Characteristics and Prototype Test of an Impeller Blade of an Axial-Flow Pump Based on Bidirectional Fluid–Structure Interaction

et al. 2019

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This paper performed a numerical study into the dynamic stress improvement of an axial-flow pump and validated the simulation results with a prototype test. To further analyze the dynamic stress characteristics of impeller blades of axial-flow pumps, a bidirectional fluid–structure interaction (FSI) was applied to numerical simulations of the unsteady three-dimensional (3-D) flow field of the whole flow system of an axial-flow pump, and the gravity effect was also taken into account. In addition, real-structure-based single-blade finite element model was established. By using the finite element method, a calculation of the blade’s dynamic characteristics was conducted, and its dynamic stress distribution was determined based on the fourth strength theory. The numerical results were consistent with the prototype tests. In a rotation cycle, the dynamic stress of the blade showed a tendency of first increasing, and then decreasing, where the maximum value appeared in the third quadrant and the minimum appeared in the first quadrant in view of the gravity effect. A method for reducing the stress concentration near the root of impeller blades was presented, which would effectively alleviate the possibility of cracking in the unreliable region of blades. Simultaneously, an experimental method for the underwater measurement of the dynamic stress of prototypical hydraulic machinery was put forward, which could realize the underwater sealing of data acquisition instruments on rotating machinery and the offline collection of measured data, finally effectively measuring the stress of underwater moving objects.

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Section: Computing Methods Of Flow Fieldsmentioning

confidence: 99%

Section: Structure Models and Boundary Conditionsmentioning

confidence: 99%

Study into the Improvement of Dynamic Stress Characteristics and Prototype Test of an Impeller Blade of an Axial-Flow Pump Based on Bidirectional Fluid–Structure Interaction

et al. 2019

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“…The static and dynamic behavior analysis of the mechanical assembly requires an interaction between practice and theory by the mathematical computational methods. In this way, several researches have been developed around the performance of hydrodynamic bearings used in highspeed machines [10][11][12]. Since the finite element method (FEM) offers obvious modeling advantages, the implementation of simulations for the study of high-speed systems has been the subject of recent publications.…”

Section: Introductionmentioning

confidence: 99%

Structural design and stress analysis of a high-speed turbogenerator assembly supported by hydrodynamic bearings

Bento

Filho²,

Fumagalli³

2019

J Braz. Soc. Mech. Sci. Eng.

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Turbine and bushing bearing are the most critical components of high-speed machines. This paper describes the design of a high-speed turbine supported by hydrodynamic bearings. The mathematical dimensioning and the FEM analysis are presented to validate the mechanical strength of the turbine and the bushing bearing models. Fatigue life and factor of safety are also determined. The simulations show that the maximum von Mises stress values obtained are associated with the centrifugal force generated by the system rotational movement. The results variation is mainly due to the properties of the materials proposed. For the turbine, 7075-T6 aluminum alloy and SAE 4340 steel obtained satisfactory behavior under a constant operating speed of 30,000 RPM. For the hydrodynamic bearing, the TM23 bronze alloy exhibited excellent results, without fracture, and low mechanical deformation. The models exhibited a great potential employment in several applications, such as biogas systems to generate electrical energy, and educational test bench for thermodynamic and tribological simulations. Keywords High-speed machines • Structural design • Steam turbine • Hydrodynamic bearings • FEM analysis List of symbols µ d Coefficient of dynamic friction Aα Turbine full-arc C y Blades theoretical velocity D m Mean blade diameter F f Dynamic friction force F N Normal force h e Input enthalpy h s Output enthalpy ṁ Mass flow ƞ i Internal efficiency ƞ m Mechanical efficiency R Mean radius of blades length u Tangential velocity v m Mean velocity coefficient Ẇ Power Z Number of blades Z min Minimum number of blades γ Specific internal work ε Coefficient of laminar steam flow ω Angular velocity

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“…In the past, many people have taken researches on thrust bearings, 1–4 but these researches mostly focused on numerical calculation methods. Tae Ho Kim et al.…”

Section: Introductionmentioning

confidence: 99%

Lubrication performance of planar thrust bearing with consideration of roughness of the surfaces

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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Based on the numerical simulation of the rough surfaces, Reynolds equation and Newton's Second Law of Motion-Force and Acceleration, the calculation model for planar thrust sliding bearing considering microcosmic topography is established in this paper. A method for calculating the acceleration of bearing is presented. By a specific example, the changes of the oil film pressure, acceleration and additional load of the thrust bearing during rotating are numerically calculated by the MATLAB program. The influences of rotation speed, surface roughness, and rotor mass on the lubrication performance of thrust sliding bearing were studied in detail.

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3D Two-way coupled TEHD analysis on the lubricating characteristics of thrust bearings in pump-turbine units by combining CFD and FEA

Cited by 17 publications

References 17 publications

Study into the Improvement of Dynamic Stress Characteristics and Prototype Test of an Impeller Blade of an Axial-Flow Pump Based on Bidirectional Fluid–Structure Interaction

Study into the Improvement of Dynamic Stress Characteristics and Prototype Test of an Impeller Blade of an Axial-Flow Pump Based on Bidirectional Fluid–Structure Interaction

Structural design and stress analysis of a high-speed turbogenerator assembly supported by hydrodynamic bearings

Lubrication performance of planar thrust bearing with consideration of roughness of the surfaces

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