Determination of the Discharge Coefficient of a Thin-Walled Orifice Used in Hydrostatic Bearings

Charles, S.; Bonneau, Olivier; Frêne, Jean

doi:10.1115/1.1843158

Cited by 9 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…23 The recess outflow into the film lands comprises two parts, the flow across axial and circumferential boundaries of the recess…”

Section: Energy Equationmentioning

confidence: 99%

“…where C d is the discharge coefficient of the orifice restrictor related to the pressure drop law of the orifice, and C d of 0.8 is chosen according to the recommended value in the literature. 23 The recess outflow into the film lands comprises two parts, the flow across axial and circumferential boundaries of the recess…”

Section: Energy Equationmentioning

confidence: 99%

“…The recess flow continuity equation is expressed as where the flow through the orifice restrictor is where C d is the discharge coefficient of the orifice restrictor related to the pressure drop law of the orifice, and C d of 0.8 is chosen according to the recommended value in the literature. 23…”

Section: Theoretical Analysismentioning

confidence: 99%

See 2 more Smart Citations

Centrifugal effects on the dynamic characteristics of high speed hydrostatic thrust bearing lubricated by low viscosity fluid

Wang

Jiang

2014

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

The effect of the centrifugal force of the fluid film on the performance of the high speed hydrostatic thrust bearing lubricated by low viscosity fluid cannot be neglected. Considering the centrifugal inertia effect, concentrated inertia effect at the recess edge, and the misalignment effect, the thermo-hydrodynamic lubrication model is established by using the reduced Navier-Stokes equation, the energy equation, and the bulk flow theory. The effects of centrifugal forces on dynamic performances of the high speed thrust bearing with different supply pressures and rotational speeds have been analyzed systematically. The results show that the centrifugal force reduces the axial and angular stiffness and hardly affects the damping coefficients; the centrifugal effects decrease with the increasing of eccentricity ratio and misalignment angle.

show abstract

“…23 The recess outflow into the film lands comprises two parts, the flow across axial and circumferential boundaries of the recess…”

Section: Energy Equationmentioning

confidence: 99%

Section: Energy Equationmentioning

confidence: 99%

See 1 more Smart Citation

Centrifugal effects on the dynamic characteristics of high speed hydrostatic thrust bearing lubricated by low viscosity fluid

Wang

Jiang

2014

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

show abstract

“…The double conical hybrid bearing is provided with 2 Â 6 recesses and orifice restrictors 10 and is fed with water at 150 bar. The average fluid film thickness in the two parts of the bearing is $40 mm.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Identification of stiffness and damping coefficients of hydrostatic bearing with angled injection

Jolly

Hassini

Arghir

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

This study deals with the experimental results obtained for a hydrostatic/hydrodynamic bearing used in aerospace turbopumps. This supporting element, if fitted with angled injection directed against shaft rotation, can provide a stabilizing effect to the rotor by reducing the circumferential flow. In order to characterize this effect and to improve its numerical simulation, an experimental housing has been designed to test the three directions of injection (radial, 25° and 50°). Measurements were obtained for the centered bearing operating at 2 kr/min, 4 kr/min and 6 kr/min with supply pressures of 2.5 MPa, 3.5 MPa and 4.5 MPa. The test rig uses hot water (<50 ℃) as a working fluid. For given operating conditions, a set of dynamic excitations imposed to the rotor provides complex impedances that are used for identifying dynamic coefficients. According to many pressure plugs distributed along the housing, the pattern of the pressure field in the recess and the thin fluid film near the recess is reconstructed. The bearing flow rate is also measured. Static and dynamic experimental results are compared with theoretical results obtained bycombining a pressure pattern model with a bulk-flow analysis. A good agreement between the two methods is observed. The measured cross-coupled stiffness is lower than the predicted one, indicating that the benefits of angled injection are better than what was predicted.

show abstract

“…2. The stator of the tested component is supported by a balance force while its rotor is overhung mounted at one end of the shaft of a Double Conical Hybrid Thrust Bearing, specially designed for this application [22]. At the other end, the shaft is entrained up to 6000 rpm by an electric motor.…”

Section: Experimental Measurement Of Vibration Displacement and Dynam...mentioning

confidence: 99%

Identification of the Dynamic Coefficients of Hybrid Bearings

Atchonouglo

Bonneau²,

Jolly³

et al. 2011

KEM

View full text Add to dashboard Cite

Within the linear region, the oil-film force increment of journal bearing is a fourdegree- of-freedom linear system. This paper presents an experimental method to identify hybrid bearing coefficients. Under various testing conditions described, experimental data are required on a complex test rig. An inverse technique based on least square method in time domain is developped for the coefficients identification. It results from the experimental data exploitation that the linear stiffness and damping coefficients are sensitive to the pressure feed, but the mass coefficients are insensitive.

show abstract

Determination of the Discharge Coefficient of a Thin-Walled Orifice Used in Hydrostatic Bearings

Cited by 9 publications

References 10 publications

Centrifugal effects on the dynamic characteristics of high speed hydrostatic thrust bearing lubricated by low viscosity fluid

Centrifugal effects on the dynamic characteristics of high speed hydrostatic thrust bearing lubricated by low viscosity fluid

Identification of stiffness and damping coefficients of hydrostatic bearing with angled injection

Identification of the Dynamic Coefficients of Hybrid Bearings

Contact Info

Product

Resources

About