Experimental Investigation of an Inclined Ellipse Dimpled Gas Face Seal

Bai, Shaoxian; Peng, Xudong; Bai, Linqing

doi:10.1080/10402004.2012.676161

Cited by 9 publications

(10 citation statements)

References 11 publications

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“…The hydrodynamic pressure generated by elliptical texture is stronger because of the converging structure in the direction of motion, resulting in higher load capacity (Ji et al, 2014;Shen and Khonsari, 2016a;Chen et al, 2019). In the gas face seals, elliptical texture as a type of symmetrical structure, presents obvious hydrodynamic effect because of its pumping effect on sealing fluid, and more than 20 per cent greater of the hydrodynamic effect at seal pressure of 0.9 MPa, which has been illustrated in theoretical analysis (Bai et al, 2010(Bai et al, , 2012Ding and Bai, 2017) and experimental investigation.…”

Section: Introductionmentioning

confidence: 88%

Hydrodynamic effect of non-closed elliptical grooves of bi-directional rotation gas face seals

Xie

Bai

2019

ILT

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Purpose The purpose of this paper is to improve opening performance of bi-directional rotation gas face seals by investigating the hydrodynamic effect of non-closed elliptical grooves. Design/methodology/approach A model of non-closed elliptical groove bi-directional rotation gas face seal is developed. The distribution of lubricating film pressure is obtained by solving gas Reynolds equations with the finite difference method. The program iterates repeatedly until the convergence criterion on the opening force is satisfied, and the sealing performance is finally obtained. Findings Non-closed elliptical groove presents much stronger hydrodynamic effect than the closed groove because of drop of the gas resistance flowing into grooves. Besides, the non-closed elliptical groove presents significant hydrodynamic effect under bi-directional rotation conditions, and an increase of over 40 per cent is obtained for the opening force at seal pressure 4.5 MPa, as same level as the unidirectional spiral groove gas seal. In the case of bi-directional rotation, the value of the inclination angle is recommended to set as 90° presenting a structure symmetry so as to keep best opening performance for both positive and reverse rotation. Originality/value A model of non-closed elliptical groove bi-directional rotation gas face seal is established. The hydrodynamic mechanism of this gas seal is illustrated. Parametric investigation of inclination angle and integrity rate is presented for the non-closed elliptical groove bi-directional rotation gas face seal.

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Section: Introductionmentioning

confidence: 88%

Hydrodynamic effect of non-closed elliptical grooves of bi-directional rotation gas face seals

Xie

Bai

2019

ILT

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“…Various seals are important parts of hydrocylinders for hydraulic equipment, such as hydraulic presses, hydraulic jacks, hydraulic pipe benders, and so on (Rui and Gordon (1); Mnif, et al (2); Bai,et al (3), (4)). The service life of a well-designed seal is mainly determined by its wear resistance during sliding (Vila,et al (5)).…”

Section: Introductionmentioning

confidence: 98%

Friction and Wear Behavior of Bronze Matrix Composites for Seal in Antiwear Hydraulic Oil

Cui

2014

Tribology Transactions

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New self-lubricating bronze matrix composites were prepared for seals and the tribological mechanisms in antiwear hydraulic oil were explored. The tribological behavior of bronze matrix composites tribotesting against an AISI 52100 steel ball was investigated with a ball-on-disc tribotester over a wide range of applied load and sliding speed. The obtained results showed that the tribological properties of composites were markedly improved. The alumina enhanced the strength and wear resistance of composites. However, the friction coefficient increased due to the addition of alumina. Silver was an effective solid lubricant. The tribological properties of the new selflubricating composites were improved because of the synergistic effect of silver and Al 2 O 3 .

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“…15 The orientation parameters, including slender ratio and inclined angle, were employed to characterise the direction of microdimple by Bai et al 16 LCC and seal leakage of an inclined ellipse dimple dry gas seal (DGS) were investigated numerically and experimentally, indicating that dimple orientation increases the flow distance in the dimple and produces fluid cumulative effect in the dimple length direction, thus leads both LCC and leakage to increase. 17,18 The sealing performance of orientation rectangular dimple and triangular dimple on liquidlubricated mechanical seal compared with circular dimple was investigated by Xie et al, 19,20 indicating that triangular dimple in clockwise direction shows the better friction reduction effect compared with circular dimple in liquidlubricated mechanical seal. However, the surface dimples employed in recent studies were always based on the conventional dimple shapes, including ellipse, rectangle, triangle, and circle, which limit the LCC and sealing performance of mechanical seals and bearings.…”

Section: Introductionmentioning

confidence: 99%

“…Surface texture orientation influences the flow characteristics of fluid in lubrication, which provides a potential way to improve hydrodynamic effect of microdimples . The orientation parameters, including slender ratio and inclined angle, were employed to characterise the direction of microdimple by Bai et al LCC and seal leakage of an inclined ellipse dimple dry gas seal (DGS) were investigated numerically and experimentally, indicating that dimple orientation increases the flow distance in the dimple and produces fluid cumulative effect in the dimple length direction, thus leads both LCC and leakage to increase . The sealing performance of orientation rectangular dimple and triangular dimple on liquid‐lubricated mechanical seal compared with circular dimple was investigated by Xie et al, indicating that triangular dimple in clockwise direction shows the better friction reduction effect compared with circular dimple in liquid‐lubricated mechanical seal.…”

Section: Introductionmentioning

confidence: 99%

Parameter study and shape optimisation of a generalised ellipse dimple‐textured face seal

Kou

Wang

et al. 2019

Lubrication Science

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A new type of generalised ellipse dimple has been introduced to improve load‐carrying capacity (LCC) of gas face seal. Theoretical model was developed to study the influence of key geometrical parameters of generalised ellipse dimple texture on LCC and leakage rate of gas face seal. Then the optimised shape of dimples for maximum LCC under different working conditions were obtained using genetic algorithm method. It is observed that generalised ellipse dimple with proper unit number and long axis included angle can enhance LCC and make a better balance between LCC and sealing characteristics of gas face seal compared with conventional ellipse or circle dimple at high speed. Dimple‐textured gas face seal with multirow radial dimples outperforms that with single‐row radial dimple on sealing characteristics.

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Experimental Investigation of an Inclined Ellipse Dimpled Gas Face Seal

Cited by 9 publications

References 11 publications

Hydrodynamic effect of non-closed elliptical grooves of bi-directional rotation gas face seals

Hydrodynamic effect of non-closed elliptical grooves of bi-directional rotation gas face seals

Friction and Wear Behavior of Bronze Matrix Composites for Seal in Antiwear Hydraulic Oil

Parameter study and shape optimisation of a generalised ellipse dimple‐textured face seal

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