The performance of spiral groove dry gas seal under choked flow condition considering the real gas effect

Xu, Hengjie; Song, Pengyun; Mao, Wenyuan; Deng, Qiangguo

doi:10.1177/1350650119891563

Cited by 13 publications

(9 citation statements)

References 16 publications

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“…All instant moments during startup process of the sealing ring are viewed as the force balanced state (i.e., opening force is equal to the closing force F o = F c ). The discretized expressions of equation (7) obtained by the finite difference method (FDM) is shown as follows 28…”

Section: Verification Of Developed Numerical Methodsmentioning

confidence: 99%

Analysis on the startup characteristics of CO₂ dry gas seal based on the F-K slip flow model at high pressure

Deng

Song

et al. 2023

Advances in Mechanical Engineering

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The gas film of the carbon dioxide (CO2) spiral groove dry gas seal (S-DGS) is less than 3 μm during the startup process, and its opening stability is directly related to the operating performance of S-DGS. The finite difference method is employed to solve numerically the pressure distribution of S-DGS considering the slip flow and the real gas effect. The influence of both effects on the startup characteristics of S-DGS is discussed at different structural parameters. The results show that the slip flow effect inhibits the opening ability of CO2 S-DGS, whereas the real gas effect enhances its opening ability. Within the range of working conditions investigated, the seal processes a lowest startup rotational speed when the spiral angle is 7.5°, and the highest gas film stiffness occurs at small spiral angle when the film thickness is 0.6 μm. However, the relationship between groove number and gas film stiffness is complex which relates to the balance film thickness of the startup process. A higher opening ability can also be achieved by reasonably increasing the balance coefficient.

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Section: Verification Of Developed Numerical Methodsmentioning

confidence: 99%

Analysis on the startup characteristics of CO₂ dry gas seal based on the F-K slip flow model at high pressure

Deng

Song

et al. 2023

Advances in Mechanical Engineering

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“…Dry gas seal (DGS) is a rapidly developing sealing technology, and enhancing its stability characteristic plays an important role in improving the efficiency of the main engine (Xu, 2019). As the core component of rotating machineries in petroleum chemical and energy power industries, the main reason of sealing failure is dynamic instability (Hu et al , 2017).…”

Section: Introductionmentioning

confidence: 99%

Analysis on the dynamic characteristics of spiral groove dry gas seal based on the gas film adaptive adjustment model

Yue

Song

et al. 2023

ILT

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Purpose This study aims to acquire the influence mechanism of gas film adaptive adjustment (GFAA) acted on the dynamic characteristics of spiral groove dry gas seal (S-DGS) and then propose a sealing stability enhancement measure. Design/methodology/approach The gas film dynamic stiffness and damping of S-DGS are obtained by numerically solving the transient Reynolds equation based on perturbation method and finite difference method. The dynamic coefficients in GFAA model and constant gas film thickness (CGFT) model are compared and analyzed. Findings There is the risk to misestimate the instability of DGS with rotational speed or medium pressure grows under the condition of CGFT assumption. Based on GFAA model, increasing balance ratio B properly is an effective measure to improve the stability of DGS. The balance ratio can stimulate the sensitivity of gas film dynamic coefficients to the variation of rotational speed. Increasing medium pressure in small balance ratio range will be conducive to reducing the risk of angular instability. Originality/value The influence mechanism of GFAA on S-DGS dynamic characteristics is analyzed. The interactions between rotational speed and balance ratio, medium pressure and balance ratio acted on gas film dynamic characteristics are explored based on the GFAA model.

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“…Ma et al (2015Ma et al ( , 2016b obtained the working performance of DGS and studied the temperature and pressure distribution of the gas film, as well as its sealing performance. Xu et al (2020Xu et al ( , 2023 calculated the specific heat of CO 2 based on thermodynamic theory and explored the effect of gas film regulation on dry gas sealing performance. Zhang et al (2022) investigated the SCO 2 DGS at different inlet temperatures and believed that liquid CO 2 and two-phase CO 2 appeared on the sealing surface.…”

Section: Introductionmentioning

confidence: 99%

The effect of thermal-elastic deformation on the sealing performance of supercritical CO₂ dry gas seal

Wang,

Hao

et al. 2023

ILT

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Purpose The purpose of this study is to investigate the sealing performance of S-CO2 dry gas seals (DGSs) by considering the effects of pressure-induced deformation, thermal deformation and coupling deformation. Design/methodology/approach A hydrodynamic lubrication flow model of S-CO2 DGS was established, and the model was solved using the finite difference and finite element methods. The pressure-induced deformation and thermal deformation of the sealing ring, as well as the sealing performance under the effects of pressure-induced deformation, thermal deformation and coupling deformation, were obtained. Findings The deformation of the sealing ring is mainly thermal deformation. The influence of pressure-induced deformation on leakage and gas film stiffness is greater than that of thermal deformation and coupling deformation. However, thermal deformation has a greater impact on friction torque and minimum film thickness than pressure-induced deformation and coupling deformation. The influence of deformations on sealing performance is important. Originality/value The sealing performance of S-CO2 DGSs was analyzed considering the effect of pressure-induced deformation, thermal deformation and coupling deformation, which can provide a theoretical basis for S-CO2 DGS optimization design. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2023-0120/

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The performance of spiral groove dry gas seal under choked flow condition considering the real gas effect

Cited by 13 publications

References 16 publications

Analysis on the startup characteristics of CO₂ dry gas seal based on the F-K slip flow model at high pressure

Analysis on the startup characteristics of CO₂ dry gas seal based on the F-K slip flow model at high pressure

Analysis on the dynamic characteristics of spiral groove dry gas seal based on the gas film adaptive adjustment model

The effect of thermal-elastic deformation on the sealing performance of supercritical CO₂ dry gas seal

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The performance of spiral groove dry gas seal under choked flow condition considering the real gas effect

Cited by 13 publications

References 16 publications

Analysis on the startup characteristics of CO2 dry gas seal based on the F-K slip flow model at high pressure

Analysis on the startup characteristics of CO2 dry gas seal based on the F-K slip flow model at high pressure

Analysis on the dynamic characteristics of spiral groove dry gas seal based on the gas film adaptive adjustment model

The effect of thermal-elastic deformation on the sealing performance of supercritical CO2 dry gas seal

Contact Info

Product

Resources

About

Analysis on the startup characteristics of CO₂ dry gas seal based on the F-K slip flow model at high pressure

Analysis on the startup characteristics of CO₂ dry gas seal based on the F-K slip flow model at high pressure

The effect of thermal-elastic deformation on the sealing performance of supercritical CO₂ dry gas seal