Prediction of sealing interface leakage based on porous medium model considering effective porosity

Non-asbestos gaskets have high tensile properties, good permeability resistance, and resilience. Compared with traditional asbestos gaskets, non-asbestos gaskets have the advantages of less pollution and no harm to human body. This manuscript presented an experimental and theoretical study of aramid fiber reinforced non-asbestos gaskets. The tensile strength of gaskets with different fiber orientations and tensile rate were conducted in order to meet the industrial standard. The leakage rates of nondestructive non-asbestos gaskets with different sizes under different medium pressures and pretightening load were investigated. The results showed that the leakage rate can reach the industrial standard when the pretightening load reached 30 MPa and medium pressures was less than 2 MPa. The artificial scratch defects were made on non-asbestos gaskets, and the effect of the width and depth of the scratch defect on leakage rate was further investigated. The sealing failure would occur when the scratch depth reached 0.1 mm. The modified model containing defect factors was established. The results showed that the modified model can well characterize leakage rate of gasket.

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“…The prediction model of non‐asbestos gaskets leakage rate was built on the basis of porous media model. [ 30–33 ] The formula () was as follows:

\begin{matrix} normalL goodbreak= A_{L} \frac{1}{η} {(\frac{S_{normalG}}{S_{G 0}})}^{ul} P^{2} \frac{D_{normalX}}{D_{0}} \end{matrix}

In the formula, L was volume leakage rate, Pa·m 3 /s. A L was the regression coefficient.…”

Section: Resultsmentioning

confidence: 99%

“…The prediction model of non-asbestos gaskets leakage rate was built on the basis of porous media model. [30][31][32][33] The formula (3) was as follows:…”

Section: Leakage Rate Model Of Defective Samplementioning

confidence: 99%

Sealing characteristics of aramid fiber reinforced rubber gasket with scratch depth and width defects

Zhang

Xiang

et al. 2023

Polymer Composites

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“…In order to analyze the leakage characteristics of the discontinuous flow field, many scholars have developed a static leakage model of the contact seal based on fractal theory. Hossain [13] conducted a static leakage study on the axial leakage of the contact seal, while Cui [14] introduced a porous medium in the model to enhance the calculation accuracy. Yang [15] considered the effect of the asperities deformation on the leakage rate of the contact seal and further optimized the static leakage model.…”

Section: Introductionmentioning

confidence: 99%

Study on the Evolution of Sealing Performance during the Start-Up Process of Dynamic Pressure Seals Based on Three-Dimensional Fractal Functions

Bi,

Li,

Zhang

et al. 2024

Machines

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A model based on a three-dimensional fractal function is developed and used in conjunction with experiments to analyze the evolutionary pattern of sealing performance during the start-up process of dynamic pressure seals, and the influence of end-face microscopic features on the evolution law is discussed. It is found that the opening state of the seal is divided into three stages: the non-opened stage, transition stage, and full-opened stage. The isotropic dimensions of the cavities have a coupling effect on the leakage, and they diminish as the speed increases. In order to enhance the sealing performance during start-up, it is suggested that the seal faces have a fractal dimension of 2.4 to 2.6, and a characteristic factor of less than 1 × 10−9 m.

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“…21 To investigate the real contact area and the elastoplastic deformation of the contact with rough surfaces the microscopic finite element model (FEM) was utilized by Hyun et al 22 and Yong et al 23,24 In order to quantify the sealing performance based on the contact state, Yu et al 25,26 examined the microleakage channel inside the mechanical seal interfaces. Cui et al 27,28 developed a porous media leaking model to investigate the effect of microscopic surface topography on sealing performance. Although current methods are adequate for solving microscopic sealing problems, they can hardly take into account the multiscale factors included in the real sealing problem, acting as the boundary condition of the microscopic model.…”

Section: Introductionmentioning

confidence: 99%

A novel FE model for the sealing performance of aviation flare joints with multiscale factors of manufacturing and assembly

Deng,

Luo,

Zhang

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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The interfacial contact status of a joint determines the sealing performance of an aircraft hydraulic system, which is influenced by inevitable multiscale assembly errors and joint manufacturing deviations. To address these challenges, a novel geometric analysis model was heuristically created that incorporates assembly and manufacturing-related topographies to accurately estimate the initial relative assembly position of joint surfaces. A microscopic contact model was constructed using the reverse reconstruction approach based on measured surface characteristics. Combining the relative position, a multiscale finite element contact model was generated to investigate the impact of each scale topography on the contact state of the seal ring. The experimental data verified the simulated indentation findings, confirming the model's efficacy in estimating contact status and seal performance characteristics. It is found that the flare angle has a more obvious effect on the contact state of the sealing interface, and a 2° difference in angle under the same load can cause a 28.19% difference in contact area, which greatly affects the sealing performance.

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Prediction of sealing interface leakage based on porous medium model considering effective porosity

Cited by 6 publications

References 14 publications

Sealing characteristics of aramid fiber reinforced rubber gasket with scratch depth and width defects

Sealing characteristics of aramid fiber reinforced rubber gasket with scratch depth and width defects

Study on the Evolution of Sealing Performance during the Start-Up Process of Dynamic Pressure Seals Based on Three-Dimensional Fractal Functions

A novel FE model for the sealing performance of aviation flare joints with multiscale factors of manufacturing and assembly

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