An anisotropic porous media model for leakage analysis of finger seal

Wang, Qiang; Hu, Yaping; Ji, Honghu

doi:10.1177/0954410019862080

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…calculation formula is shown as formula (8). In formula (8), Vmax is the maximum value of parameters, Vmin is the minimum value of parameters, V is practical value of parameters, are the maximum value, minimum value, and value of each parameter during calculation min max min Figure 9 is the variation of the minimum hysteresis of finger seal along with variation of structural dimensionless parameters. The results in figure 9 reflects the influence of structural parameters on hysteresis characteristics of finger seal.…”

Section: Results Analysismentioning

confidence: 99%

“…At present, the porous media model is the most commonly numerical calculation method used by scholars at home and abroad. For example, the porous media model was used to conduct numerical studies on the leakage characteristics of finger seals by Hu TX [7], Wang Q [8], Bai HL [9], Cao J [10][11] et al Zhang YC [12] established a quasi-dynamic performance model for quantified expression of finger sealing performance with finite element analysis, which solved the problem of difficulty in calculation of leakage characteristics and large computational workload. Wang L [13] proposed an optimization model aiming at low leakage rate and low wear rate.…”

Section: Introductionmentioning

confidence: 99%

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A Mathematical Calculation Method for Hysteresis Characteristics Analysis of Arc-Shaped Finger Seal

Zhang

Cui

et al. 2020

Preprint

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In order to accurately predict the hysteresis characteristics of finger seal, the minimum hysteresis which can directly reflect the hysteresis of finger seal is proposed to characterize the hysteresis of finger seal. The mathematical model for calculating the minimum hysteresis of finger seal is established, the correction coefficient in the mathematical model is determined, and the mathematical model is verified by experiments. The influence of the structure and working condition parameters of finger laminates on the hysteresis characteristics is studied based on the modified calculation model, and the rule of influence is obtained in the end. Research results show that the maximum error between the leakage characteristics numerical calculation of finger seal base on modified calculation model and the experiment results is 7.64%, and the mathematical model of the minimum hysteresis is reasonable and reliable. The descending order of influence degree of structural parameters on the hysteresis characteristics of finger seal is: thickness of each finger laminate, finger repeat angle, arc radius of the finger beam arcs‘ centers, diameter of the finger base circle, width of the interstice between fingers, arc radius of finger beam. The research results provide a theoretical basis for further research on the influence of hysteresis on the finger seal leakage characteristics and the optimal design of finger seal structure.

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Section: Results Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Mathematical Calculation Method for Hysteresis Characteristics Analysis of Arc-Shaped Finger Seal

Zhang

Cui

et al. 2020

Preprint

Self Cite

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“…The material of the primary ring of the 48 V mechanical seal is SiC, and its main physical parameters 19, 20 are shown in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Wear mechanism and leakage failure analysis of the mechanical seal end face of an oil transfer pump

Qiao,

Mo,

Mao

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The John Crane 48 V mechanical seal is a long-distance oil transfer pump station shaft end seal; its sealing effect directly affects pipeline production safety. However, it has been found that there is oil leakage at the shaft end of the pump station. In order to explore the oil transfer pump mechanical seal abnormal leakage failure causes, to ensure the safety and stability of production, the end face of the 48 V mechanical seal was analyzed by white light interference and scanning electron microscope technology. The failure mechanism of the 48 V mechanical seal was explored from the perspective of the wear mechanism of moving and stationary rings. Results showed that the wear mechanism of the 48 V mechanical seal stationary ring was mainly abrasive wear, and substantial furrows, bulges, and depressions existed on the wear surface. The material removal mechanism was brittle spalling, and the roughness of the wear surface increased with the increase in wear depth and decreased with the increase in wear average width. Uneven wear occurred on the end face of the stationary ring of the mechanical seal, resulting in the leakage of the sealing medium from the end cover of the mechanical seal. The working condition could be improved by adding a spring compensation device to the stationary ring or increasing the gap between the stationary ring and the shaft sleeve.

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“…For averaging requirements that are not entirely accurate, the parameters can be averaged at the coarse level, and the control elements can be selected at the coarse level. At present, the academic circle calls the control elements selected by this method the Representative Macroscopic Volume (RMV) (Wang et al, 2020a;Wang et al, 2020b). For the selection of the RMV, the feature-length d, the size of the entire region L, and the size of the macroscopic parameter inhomogeneity l must satisfy l ≤ d ≤ L, as displayed in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Analysis on “three-box” model of stress-strain in frozen soil porous media based on representative macroscopic Volume

et al. 2022

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In cold regions, the pore space’s composition and phase state can affect the elastic modulus of the media. During the winter, the freezing conditions in the soil results in the release of water from the pore space, which results in significant changes in the media’s distribution and composition. There are a few weaknesses in the current research with respect to the elastic modulus change example of frozen soil. This paper presents that the Representative Macroscopic Volume (RMV) choice strategy is provided for frozen soil with porosity as a typical condition variable. Under the state of freezing, a “three-box” analytical model for stress-strain calculation of frozen soil porous media is established, namely, the black-box model, the gray-box model, and the white-box model. The relevant equations for calculating elastic modulus are presented based on the proposed “three-box” model and the analysis of the stress conduction process. Results show that the discrepancy between the computed and experimental values of the white-box model is slight, and the elastic modulus of frozen soil calculated by the model established in this paper is consistent with the actual state. It can be deduced that the model established in this paper has practicality and the conclusions of the study are of guiding significance for the application of frozen soil.

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An anisotropic porous media model for leakage analysis of finger seal

Cited by 8 publications

References 18 publications

A Mathematical Calculation Method for Hysteresis Characteristics Analysis of Arc-Shaped Finger Seal

A Mathematical Calculation Method for Hysteresis Characteristics Analysis of Arc-Shaped Finger Seal

Wear mechanism and leakage failure analysis of the mechanical seal end face of an oil transfer pump

Analysis on “three-box” model of stress-strain in frozen soil porous media based on representative macroscopic Volume

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