Method for analyzing abrasion and leakage of mechanical seal with surface microtexture

Abstract

The invention relates to the technical field of aero-engine sealing design, in particular to a surface micro-texture mechanical seal abrasion and leakage analysis method which comprises the following steps that S1, a friction abrasion experiment is conducted, and the friction coefficient and the abrasion rate are obtained; s2, the friction coefficient and the bearing coefficient of the mechanical sealing end face with given working condition parameters and surface micro-texture parameters are calculated; s3, calculating a steady-state value of the dissipation coefficient; and S4, the abrasion loss and the leakage amount are calculated. According to the method, the abrasion loss and the leakage rate of the mechanical seal end face on different micro-texture surfaces under different working conditions can be evaluated, and the method has high universality and engineering applicability.

Description

Technical Field

[0001] The present disclosure relates to the technical field of aero-engine seal design, and in particular to a wear and leakage analysis method for a mechanical seal with surface micro-texture. Background Art

[0002] The frictional behavior of mechanical seals in aircraft engine oil chambers is extremely complex. Domestically, there is insufficient understanding of the friction and wear mechanisms of mechanical seals in these chambers, and a lack of tools for analyzing mechanical seal friction, wear, and leakage performance. Consequently, breakthroughs in suppressing seal wear, reducing oil leakage failure rates, and extending seal life have been delayed. Therefore, it is necessary to develop analytical methods for wear and leakage analysis of mechanical seals in aircraft engine oil chambers and to develop capabilities for evaluating the performance of mechanical seals and their surface microtextures.

[0003] The lubrication conditions experienced by the mechanical seal faces in aircraft engine oil chambers are highly complex, ranging from dry friction to oil-air mixed lubrication to pure fluid lubrication, or a combination of these conditions. The friction and wear patterns and mechanisms of mechanical seals, coupled with multiple fields, phases, and flow regimes, are highly complex. Hundreds of wear quantification models exist, but a universally recognized wear quantification model remains unresolved in the field of tribology.

[0004] In summary, how to calculate the wear and leakage of mechanical seals with surface microtexture is one of the important issues that need to be solved urgently in this field. Summary of the Invention

[0005] The present disclosure is proposed in view of the above problems. The present disclosure provides a wear and leakage analysis method for a mechanical seal with surface micro-texture.

[0006] According to one aspect of the present disclosure, a method for analyzing wear and leakage of a mechanical seal with surface microtexture is provided, comprising the following steps:

[0007] S1, conduct friction and wear experiments to obtain friction coefficient and wear rate;

[0008] S2, calculate the friction coefficient and load coefficient of the mechanical seal end face given the working parameters and surface micro-texture parameters;

[0009] S3, calculate the steady-state value of the dissipation coefficient;

[0010] S4, calculate the wear and leakage.

[0011] According to one aspect of the present disclosure, the wear and leakage analysis method of a mechanical seal with surface microtexture is described, wherein step S1 comprises:

[0012] S11, using a friction and wear testing machine to conduct tribological test measurements on mechanical seal counterparts;

[0013] S12, determining the maximum friction coefficient and the minimum friction coefficient;

[0014] S13, selecting multiple measuring points under mixed lubrication conditions to perform friction and wear experiments to obtain friction coefficients and wear rates.

[0015] According to the wear and leakage analysis method of a mechanical seal with surface microtexture described in one aspect of the present disclosure, the method for calculating the friction coefficient and the load coefficient in step S2 is to solve the Reynolds equation to obtain the lubrication contact pressure of the sealing interface, calculate the friction coefficient of the mechanical seal end face for given operating parameters and surface microtexture parameters, and calculate the load coefficient.

[0016] According to the wear and leakage analysis method of a mechanical seal with surface microtexture described in one aspect of the present disclosure, the calculation formula of the friction coefficient is:

[0017]

[0018] Where τ is the shear force of the entire membrane area; μ dry is the dry friction coefficient; p(i,j) is the contact pressure; λ is the gas-liquid ratio; η is the viscosity of the lubricating oil (which varies with temperature and pressure); r is the radius; ω is the angular velocity; h(i,j) is the actual film thickness, h(i,j)=h0+δ(i,j)+ν(i,j), h0 is the rigid gap, δ(i,j) is the comprehensive roughness, v(i,j) is the elastic deformation; N is the loading force.

[0019] According to one aspect of the present disclosure, a wear and leakage analysis method for a mechanical seal with surface microtexture is provided, wherein the load factor is calculated by the following equation:

[0020]

[0021] Among them, μ n is the maximum friction coefficient; μ0 is the minimum friction coefficient; ξ n , is the load-bearing coefficient corresponding to the maximum friction coefficient; ξ0 is the load-bearing coefficient corresponding to the minimum friction coefficient; ξ is the load-bearing coefficient.

[0022] According to the wear and leakage analysis method of a mechanical seal with surface microtexture described in one aspect of the present disclosure, in step S3, the method for calculating the steady-state value of the dissipation coefficient is to calculate the average value of the dissipation coefficient of multiple measuring points as the steady-state value.

[0023] According to the wear and leakage analysis method of a mechanical seal with surface microtexture described in one aspect of the present disclosure, the calculation formula of the steady-state value of the dissipation coefficient at each measuring point is:

[0024]

[0025] Wherein, μ is the friction coefficient; V is the linear velocity; T is the temperature; is the wear rate.

[0026] According to one aspect of the present disclosure, a wear and leakage analysis method for a mechanical seal with surface microtexture is provided, wherein the steady-state value is used as an input parameter, and the formula for calculating the wear amount is:

[0027]

[0028] Where t is the wear time.

[0029] According to an aspect of the present disclosure, a wear and leakage analysis method for a mechanical seal with surface microtexture is provided, wherein the formula for calculating the leakage amount is:

[0030]

[0031] Where Q is the leakage; ρ is the density of the lubricating oil (which changes with temperature and pressure); θ is the circumferential coordinate; r is the radial coordinate; r o is the outer radius of the sealing ring.

[0032] As described in detail below, the wear and leakage analysis method for mechanical seals with surface microtexture according to the disclosed embodiments involves performing friction and wear experiments (S1) to obtain the friction coefficient and wear rate; calculating the friction coefficient and load factor of the mechanical seal end face for given operating parameters and surface microtexture parameters (S2); calculating the steady-state value of the dissipation coefficient (S3); and calculating the wear and leakage (S4). This method can assess the wear and leakage of mechanical seals with surface microtexture, and is capable of evaluating the wear and leakage of mechanical seal end faces under different microtexture surfaces and operating conditions, demonstrating high universality and engineering applicability.

[0033] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other purposes, features, and advantages of the present disclosure will become more apparent through a more detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings. The accompanying drawings are intended to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and are not intended to limit the present disclosure. In the drawings, the same reference numerals generally represent the same components or steps.

[0035] Figure 1 Schematic diagram of the structure of the mechanical seal end face with surface micro-texture proposed in the present disclosure;

[0036] Figure 2 is a flowchart of the steps of the method proposed in the present disclosure;

[0037] Figure 3 is a schematic diagram of the Stribeck curve of the mechanical seal mating material proposed in the present disclosure;

[0038] Figure 4 It is a specific step flow chart of step S1 of the method proposed in the present disclosure. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present disclosure more apparent, the following will describe in detail exemplary embodiments of the present disclosure with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the exemplary embodiments described herein.

[0040] Please refer to Figure 1 The lubrication state of the mechanical seal end face of the oil cavity of an aircraft engine is very complex, and may experience dry friction, oil-gas mixed lubrication, pure fluid lubrication, or the coexistence of multiple lubrication states. The friction and wear patterns and mechanisms of mechanical seals under the coupling of multiple fields, multiple phases, and multiple flow states are very complex. There are currently hundreds of wear quantification models, but to date, there has not been a recognized universal wear quantification model in the field of tribology. The main reason is that the factors affecting wear are too complex, and their particularity outweighs their universality, which has become a scientific challenge faced by the research on wear mechanism, wear quantification and numerical simulation model under the complex and harsh working conditions of the mechanical seal of the oil cavity of an aircraft engine in an oil and gas environment.

[0041] Please refer to Figures 2 to 4 The present disclosure provides a wear and leakage analysis method for a mechanical seal with surface microtexture, which includes the following steps:

[0042] S1, conduct friction and wear experiments to obtain friction coefficient and wear rate; this step includes steps S11 to S13.

[0043] S11, using a friction and wear testing machine to perform tribological test measurements on the mechanical seal dual component material; in specific implementation, after performing the tribological test measurements, a Stribeck curve is drawn.

[0044] S12, determining a maximum friction coefficient and a minimum friction coefficient; specifically, the maximum friction coefficient and the minimum friction coefficient may be determined according to a Stribeck curve.

[0045] S13: Conduct friction and wear experiments at multiple measuring points under mixed lubrication conditions to obtain the friction coefficient and wear rate. In specific implementations, the number of measuring points is no less than three, and in practical applications, four is optimal. The friction coefficient and wear rate are obtained through the friction and wear experiments.

[0046] S2, calculate the friction coefficient and load coefficient of the mechanical seal end face for given operating parameters and surface microtexture parameters; specifically, in practical applications, solve the Reynolds equation to obtain the lubrication contact pressure of the sealing interface, calculate the friction coefficient of the mechanical seal end face for given operating parameters and surface microtexture parameters, and calculate the load coefficient.

[0047] The calculation formula of the friction coefficient is:

[0048]

[0049] Where τ is the shear force of the entire membrane area; μ dry is the dry friction coefficient; p(i,j) is the contact pressure; λ is the gas-liquid ratio; η is the viscosity of the lubricating oil (which varies with temperature and pressure); r is the radius; ω is the angular velocity; h(i,j) is the actual film thickness, h(i,j)=h0+δ(i,j)+ν(i,j), h0 is the rigid gap, δ(i,j) is the comprehensive roughness, v(i,j) is the elastic deformation; N is the loading force.

[0050] The load factor is calculated using the following equation:

[0051]

[0052] Among them, μ n is the maximum friction coefficient; μ0 is the minimum friction coefficient; ξ n , is the load-bearing coefficient corresponding to the maximum friction coefficient; ξ0 is the load-bearing coefficient corresponding to the minimum friction coefficient; ξ is the load-bearing coefficient;.

[0053] S3, calculate the steady-state value of the dissipation coefficient. In the specific implementation, in order to ensure accuracy, the method for calculating the steady-state value of the dissipation coefficient is to calculate the average value of the dissipation coefficient of multiple measuring points as the steady-state value. The calculation formula of the steady-state value of the dissipation coefficient of each measuring point is:

[0054]

[0055] Wherein, μ is the friction coefficient; V is the linear velocity; T is the temperature; is the wear rate.

[0056] S4, calculate the wear and leakage. In this step, the steady-state value is used as the input parameter, and the formula for calculating the wear is:

[0057]

[0058] Where t is the wear time.

[0059] The formula for calculating leakage is:

[0060]

[0061] Where Q is the leakage; ρ is the density of the lubricating oil (which changes with temperature and pressure); θ is the circumferential coordinate; r is the radial coordinate; r o is the outer radius of the sealing ring.

[0062] This paper provides an effective analysis and evaluation method for the design of surface texturing for wear reduction in mechanical seals used in aircraft engine oil chambers. This method can evaluate mechanical seal end face wear and leakage under different micro-textured surfaces and operating conditions, demonstrating high universality and engineering applicability.

[0063] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this disclosure are merely illustrative and not restrictive, and should not be construed as necessarily possessed by each embodiment of the present disclosure. Furthermore, the specific details disclosed above are provided for illustrative purposes and to facilitate understanding, rather than as limitations. These details do not limit the present disclosure to necessarily being implemented using these specific details.

[0064] The block diagrams of the devices, apparatuses, equipment, and systems involved in this disclosure are intended to be illustrative examples only and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams; these devices, apparatuses, equipment, and systems may be connected, arranged, or configured in any manner as would be recognized by a person skilled in the art. Words such as "include," "comprise," "have," and the like are open-ended words that mean "including but not limited to," and may be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and may be used interchangeably therewith unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and may be used interchangeably therewith.

[0065] Additionally, as used herein, "or" used in a list of items beginning with "at least one" indicates a separate list, so that, for example, a list of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not mean that the example described is preferred or better than other examples.

[0066] It should also be noted that in the system and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0067] Various changes, substitutions, and modifications may be made to the technology described herein without departing from the teachings defined by the appended claims. Moreover, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of things, means, methods, and actions described above. Currently existing or later developed processes, machines, manufactures, compositions of things, means, methods, or actions that perform substantially the same function or achieve substantially the same results as the corresponding aspects described herein may be utilized. Accordingly, the appended claims include within their scope such processes, machines, manufactures, compositions of things, means, methods, or actions.

[0068] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0069] The above description has been provided for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A wear and leakage analysis method for a mechanical seal with surface microtexture, characterized in that: The following steps are involved: S1, conduct friction and wear experiments to obtain friction coefficient and wear rate; S2, calculate the friction coefficient and load coefficient of the mechanical seal end face with given working parameters and surface micro-texture parameters; S3, calculate the steady-state value of the dissipation coefficient; S4, calculate the wear and leakage.

2. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, characterized in that: Step S1 includes: S11, using a friction and wear testing machine to conduct tribological test measurements on mechanical seal counterpart materials; S12, determining a maximum friction coefficient and a minimum friction coefficient; S13, selecting multiple measuring points under mixed lubrication state to perform friction and wear experiments to obtain friction coefficient and wear rate.

3. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, characterized in that: The method for calculating the friction coefficient and the load coefficient in step S2 is to solve the Reynolds equation, obtain the seal interface lubrication contact pressure, calculate the mechanical seal end face friction coefficient and the load coefficient for given operating parameters and surface microtexture parameters.

4. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, characterized in that: The calculation formula of friction coefficient is: Where τ is the shear force in the entire membrane area; μ dry is the dry friction coefficient of the matching pair; p(i,j) is the contact pressure; λ is the gas-liquid ratio; η is the viscosity of the lubricating oil (varies with temperature and pressure); r is the radius; ω is the angular velocity; h(i,j) is the actual film thickness, h(i,j)=h0+δ(i,j)+ν(i,j), h0 is the rigid gap, δ(i,j) is the comprehensive roughness, v(i,j) is the elastic deformation; N is the loading force.

5. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 4, characterized in that: The load factor is calculated using the following equation: Among them, μ n is the maximum friction coefficient; μ0 is the minimum friction coefficient; ξ n , is the load-bearing coefficient corresponding to the maximum friction coefficient; ξ0 is the load-bearing coefficient corresponding to the minimum friction coefficient; ξ is the load-bearing coefficient to be determined.

6. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, characterized in that: In step S3, the method for calculating the steady-state value of the dissipation coefficient is to calculate the average value of the dissipation coefficients of multiple measuring points as the steady-state value.

7. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, characterized in that: The calculation formula for the steady-state value of the dissipation coefficient at each measuring point is: Where, μ is the friction coefficient; V is the linear velocity; T is the temperature; is the wear rate.

8. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, characterized in that: Take the steady-state value as input parameter and calculate the wear volume V w The formula is: Where t is the wear time.

9. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, characterized in that: The formula for calculating leakage is: Where, Q is the leakage; ρ is the density of the lubricating oil (which varies with temperature and pressure); θ is the circumferential coordinate; r is the radial coordinate; r o is the outer radius of the sealing ring.

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