Investigations on the applicability of hydrostatic bearing technology in a rotary energy recovery device through CFD simulation and validating experiment

Xu, Enle; Wang, Yue; Wu, Jianeng; Xu, Shichang; Wang, Yuxin; Wang, Shichang

doi:10.1016/j.desal.2016.01.018

Cited by 28 publications

(8 citation statements)

References 23 publications

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“…The pressure-based solver is chosen for the numerical analysis in this study, and the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) algorithm is used to obtain a converged solution and the others are default. The residual convergence criteria is assumed to be achieved [29] when: (i) the net flow rate of fluid entering and leaving the model is less than 7.5 × 10 −6 L/min; (ii) the averaged force of the wall S reaches a stable level.…”

Section: Cfd Modelingmentioning

confidence: 99%

CFD-Based Investigation on Effects of Orifice Length–Diameter Ratio for the Design of Hydrostatic Thrust Bearings

et al. 2021

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Orifice-restricted hydrostatic thrust bearings are broadly employed in ultra-precision machine tools, aerospace industries, and so forth. The orifice length–diameter ratio (OLDR) is one of the significant geometrical parameters of the orifice-restricted hydrostatic thrust bearing, which directly affects the performance of the bearing. To accurately guide the design of the hydrostatic thrust bearing, the effect of the OLDR on the performance of the hydrostatic thrust bearing needs to be thoroughly and scientifically investigated, especially for ultra-precision machine tools. In this paper, the influences of various OLDRs are comprehensively studied using the computational fluid dynamics (CFD) approach on the pressure pattern, velocity, turbulent intensity, and vortices, as well as the load capacity, stiffness, volume flow rate, and orifice flow resistance of the hydrostatic thrust bearing under identical operating conditions. The obtained results show that there are differences in performance behaviors of the hydrostatic thrust bearing caused by different OLDRs. Some new findings are obtained, particularly in the second-order small vortices which appear in the annular recesses with all OLDRs except that of 2, and the flow resistance does not always increase with increasing OLDRs. Finally, the proposed CFD approach is experimentally validated.

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Section: Cfd Modelingmentioning

confidence: 99%

CFD-Based Investigation on Effects of Orifice Length–Diameter Ratio for the Design of Hydrostatic Thrust Bearings

et al. 2021

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“…Considering cavitation, Yu et al (2019) used CFD to study the performance of hydrostatic bearings under different groove shapes. Using FLUENT to simulate the characteristics of the support bearing on the energy recovery device, Xu et al (2016) found that the support force varied linearly with the supply pressure and film thickness and obtained the optimal film thickness. Focusing on the machining error, Cui et al (2018) combined the dynamic grid technology and CFD software to study the static pressure porous bearing, and they determined the impact of inaccurate machining on running accuracy.…”

Section: Introductionmentioning

confidence: 99%

Analysis of static and dynamic characteristics of aerostatic bearing with reflux orifices

Chen

Zhang

et al. 2021

ILT

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Purpose The purpose of this paper is to provide a solution for Reynolds equation with both throttling term and reverse throttling term and provides a reference for changing damping of hydrostatic bearing. Design/methodology/approach The reverse throttling term is introduced into the Reynolds equation, and the adaptive damping factor is used in the Newton iteration method to improve convergence of numerical calculations. The static and dynamic performances of this bearing are numerically investigated by the finite-element method. Findings The results indicate that the reflux orifices lead to a decrease in load capacity at a high eccentricity ratio. Additionally, the mass inflow rate is increased; however, the additional inflow increase can be controlled by enhanced backpressure of the reflux orifice. Nevertheless, the bearing with the reflux orifice shows superiority in resisting high-frequency disturbances and enhances direct damping by 20% under a high backpressure. Originality/value This work presents an adaptive Newton damping iterative method for solving Reynolds equation with both throttling term and reverse throttling term. This work also provides a new idea for bearing structure design in improving damping.

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“…Finite difference method (FDM) is proved to be a practical and reliable method to resolve the Reynolds equation by J Li and others. [12][13][14][15] study. Based on DA Bompos and Nikolakopoulos's 16 calculation, most hydrostatic bearings are nonlinear over damping systems and periodic cutting will influence the displacement of machining point.…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of nonlinear carrying performance of hydrostatic ram based on finite difference method and Runge–Kutta method

Wang

Liu

Cheng

et al. 2019

Advances in Mechanical Engineering

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Analyzing of nonlinear carrying performance of hydrostatic ram is among key research questions to improve heavy machine tools because the machining precision will be directly influenced by it. A dynamic model of nonlinear supporting characters for hydrostatic ram is developed in this work. Modified Reynolds equation is resolved by finite difference method numerically to determine the carrying capability. Dynamic equilibrium equation of hydrostatic ram under cutting force impact is solved by Runge-Kutta method to obtain the variation of tool tip position and evaluate the machining accuracy. An optimal oil supply rate allocation and oil pad size is proposed to improve the static and dynamic performance simultaneously based on method of bisection.

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Investigations on the applicability of hydrostatic bearing technology in a rotary energy recovery device through CFD simulation and validating experiment

Cited by 28 publications

References 23 publications

CFD-Based Investigation on Effects of Orifice Length–Diameter Ratio for the Design of Hydrostatic Thrust Bearings

CFD-Based Investigation on Effects of Orifice Length–Diameter Ratio for the Design of Hydrostatic Thrust Bearings

Analysis of static and dynamic characteristics of aerostatic bearing with reflux orifices

Analysis and optimization of nonlinear carrying performance of hydrostatic ram based on finite difference method and Runge–Kutta method

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