Static and Dynamic Analysis of Capillary Compensated Hydrostatic Journal Bearings by Finite Element Method

Singh, Devendra; Sinhasan, R.; Ghai, R.C.

doi:10.1115/1.3453244

Cited by 16 publications

(3 citation statements)

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“…Stout et al 1,2 concluded that non-recessed journal bearings are best suited for high-speed applications and to minimize power dissipation. Singh et al 3 investigated the steady-state and dynamic performance characteristics of capillary compensated hydrostatic journal bearings using finite element methods. Detailed studies by Rowe and co-workers 4-8 concerning journal bearings focused significant attention on various issues.…”

Section: Non-dimensional Parametersmentioning

confidence: 99%

Analysis of hybrid journal bearing for non-Newtonian lubricants

Duvedi

Garg

Jadon

2006

Lubrication Science

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The performance characteristics of capillary compensated hole-entry hybrid journal bearing systems have been studied theoretically. The analysis considers the generalized Reynolds equation governing the flow field of lubricant, having variable viscosity, taking the equation of lubricant flow through a capillary restrictor as constraint. The non-Newtonian lubricant is assumed to follow the cubic shear stress law. The results obtained from the study suggest that bearing static performance characteristics can be optimized for the particular bearing operating conditions by proper selection of parameters such as bearing land width ratios (ā b ), the restrictor design parameter (C s2 ), and the non-linearity factor (K ).

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Section: Non-dimensional Parametersmentioning

confidence: 99%

Analysis of hybrid journal bearing for non-Newtonian lubricants

Duvedi

Garg

Jadon

2006

Lubrication Science

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“…Rowe et al outlined a procedure to optimize the design parameters of multi-recess hydrostatic bearings based on minimum power consumption; they suggested an optimal ratio of the land part to recess of 0.25 [9]. Singh et al calculated the dynamic coefficients of capillary-compensated bearings in a pure hydrostatic operation [10]. Ghosh calculated the stiffness and damping coefficients of pure hydrostatic operation according to changes in recess pressure ratio and eccentricity [11].…”

Section: Introductionmentioning

confidence: 99%

Development of Pump-Drive Turbine Module with Hydrostatic Bearing for Supercritical CO2 Power Cycle Application

et al. 2020

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The turbomachinery used in the sCO2 power cycle requires a high stable rotor-bearing system because they are usually designed to operate in extremely high-pressure and temperature conditions. In this paper, we present a pump-drive turbine module applying hydrostatic bearing using liquid CO2 as the lubricant for a 250 kW supercritical CO2 power cycle. This design is quite favorable because stable operation is possible due to the high stiffness and damping of the hydrostatic bearing, and the oil purity system is not necessary when using liquid CO2 as the lubricant. The pump-drive turbine module was designed to operate at 21,000 rpm with the rated power of 143 kW. The high-pressure liquid CO2 was supplied to the bearing, and the orifice restrictor was used for the flow control device. We selected the orifice diameter providing the maximum bearing stiffness and also conducted a rotordynamic performance prediction based on the designed pump-drive turbine module. The predicted Campbell diagram indicates that a wide range of operation is possible because there is no critical speed below the rated speed. In addition, an operation test was conducted for the manufactured pump-drive turbine module in the supercritical CO2 cycle test loop. During the operation, the pressurized CO2 of the 70 bar was supplied to the bearing for the lubrication and the shaft vibration was monitored. The successful operation was possible up to the rated speed and the test results showed that shaft vibration is controlled at the level of 2 μm for the entire speed range.

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“…Stout and Rowe (1974a, b) reported that non‐recessed journal bearings are best suited for high‐speed applications and to minimize power dissipation. Rowe and Koshal (1977, 1979) optimized the hybrid journal bearings, which involve the comparison of the bearings to be optimized with a reference bearing on the basis of load/total power, load/pumping power and load/flow (Singh et al , 1977). Rowe et al (1982) concluded that the hole‐entry bearings are particularly effective when compared slot‐entry as well as recessed bearings for better load support and low‐energy consumptions at zero as well as for high‐speed operations.…”

Section: Introductionmentioning

confidence: 99%

FEM analysis for different configurations of non‐recessed hole‐entry hybrid journal bearings for non‐Newtonian lubricants

Duvedi

Singh

Jadon

2007

Industrial Lubrication and Tribology

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PurposeThe present work aims to predict accurately the bearing design data for non‐recessed hybrid journal bearings, considering the effect of non‐Newtonian behavior of lubricant for different symmetric and non‐symmetric bearing geometric configurations.Design/methodology/approachThe simultaneous solution of generalized Reynold's equation governing the laminar flow of incompressible lubricant and the equation of flow of lubricant through the capillary restrictor, considering variable viscosity of lubricant following the “Power law”, has been carried out using FEM. For a given set of bearing geometric, operating parameters and for given external vertical load, the values of various performance characteristics have been obtained for a range of values of power law index, after establishing the journal center equilibrium position, the analysis for which has been elaborately explained.FindingsThe results obtained have been presented graphically for various bearing performance characteristics. It has been observed that with decrease in power law index “n”(0

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Static and Dynamic Analysis of Capillary Compensated Hydrostatic Journal Bearings by Finite Element Method

Cited by 16 publications

References 0 publications

Analysis of hybrid journal bearing for non-Newtonian lubricants

Analysis of hybrid journal bearing for non-Newtonian lubricants

Development of Pump-Drive Turbine Module with Hydrostatic Bearing for Supercritical CO2 Power Cycle Application

FEM analysis for different configurations of non‐recessed hole‐entry hybrid journal bearings for non‐Newtonian lubricants

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