Method for calculating leakage amount of split type annular sealing device

Abstract

The invention belongs to the technical field of aircraft sealing devices, and particularly relates to a method for calculating the leakage amount of a split type annular sealing device, and the method comprises the following steps: 1, building a structural region model and a fluid region model; 2, segmenting the structure region model and the fluid region model, and carrying out grid division; 3, establishing a temperature field-flow field coupling analysis model of the split type annular sealing device; 4, setting boundary conditions of temperature field-flow field coupling analysis of the split type annular sealing device; 5, material physical property parameters of temperature field-flow field coupling analysis of the split type annular sealing device are set; sixthly, a steady-state calculation model is adopted, the calculation step number and the iteration step length are set, a temperature field-flow field coupling analysis result of the split type annular sealing device is calculated, and the pressure value of oil on the inner surface of the movable sealing seat and the temperature value of the movable sealing seat are obtained; step 7, establishing a temperature field-flow field-structure field coupling analysis model in the Mechical software; 8, setting boundary conditions of temperature field-flow field-structure field coupling analysis; and 9, calculating the deformation amount of the split type annular sealing device during temperature field-flow field-structure field coupling analysis, extracting a radial sealing surface deformation value and an axial sealing surface deformation value, and calculating the leakage amount G according to the established leakage amount model of the split type annular sealing device.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft sealing devices, and in particular relates to a method for calculating the leakage of a petal-type annular sealing device. Background Art

[0002] The split-flap annular seal is installed at the interface between the aircraft's gas and oil chambers. It primarily consists of a dynamic seal seat, a split-flap ring, a retaining ring, a guide plate, an oil collection tube, a rotating shaft, an oil drain nozzle, an axial sealing surface, a radial sealing surface, the inner surface of the dynamic seal seat, and a cooling chamber. The radial and axial sealing surfaces formed by the split-flap ring, dynamic seal seat, and retaining ring ensure that lubricating oil from the oil chamber does not leak into the gas chamber. Furthermore, to reduce the effects of frictional wear and frictional heat deformation on the radial and axial sealing surfaces on sealing performance, when the rotating shaft moves at high speed, cooling oil passes through the rotating shaft's oil collection tube and, under the action of centrifugal force, enters the inner surface of the dynamic seal seat, reducing frictional heat between the radial and axial sealing surfaces and ensuring the sealing performance of the split-flap annular seal. This seal features a simple structure, light weight, and excellent sealing performance. It can automatically adjust clearances to compensate for wear during use and is widely used in aircraft sealing devices.

[0003] The sealing performance of a split-type annular seal is affected, on the one hand, by the high-speed rotation of the split ring and the dynamic seal seat. When the friction and wear of the radial and axial sealing surfaces increase, the gap between the sealing surfaces increases. On the other hand, when the oil passing through the oil collection pipe is insufficient to cool the dynamic seal seat, the frictional heat generated between the sealing surfaces causes the split ring and the dynamic seal seat to deform due to heat, which in turn leads to increased deformation of the radial and axial sealing surfaces. Therefore, when designing a split-type annular seal, it is necessary to consider the combined effects of the temperature field, flow field, and structural field to ensure the sealing effect of the device.

[0004] With reference to domestic and foreign public literature, the current evaluation of the sealing performance of the split-type annular sealing device mainly uses the bench test method. However, when the structure and working environment of the split-type annular sealing device change, the previous test results need to be restarted, resulting in a long and costly experimental improvement cycle. At the same time, when the test effect of the split-type annular sealing device is not good, due to the singleness of the experimental acquisition method, the distribution law of the temperature field, flow field, and structural field of the split-type annular sealing device cannot be measured during the experiment, and the key factors affecting the sealing performance cannot be determined, and more clear guidance cannot be provided for optimization and improvement. Since the actual working conditions of the split-type annular sealing device on the machine are complex conditions of high temperature, high pressure, and high speed, the existing research and analysis methods only consider the influence of the structural field in numerical analysis, and ignore the influence of the flow field and temperature field on the structural deformation of the split-type annular sealing device during the test, which leads to deviations in the sealing performance assessment of the sealing device. Summary of the Invention

[0005] Purpose of the invention: The present invention provides a method for calculating the leakage of a split-type annular seal device. The method establishes a structural region model and a fluid region model, utilizes a segmentation method, and combines the proximity and curvature and sweep methods to mesh the structural region model and the fluid region model. First, a temperature field-flow field coupling analysis method is used to calculate the distribution law of the temperature value and flow field pressure value of the split-type annular seal device. Then, a temperature field-flow field-structure field coupling analysis method is used to load the temperature value and flow field pressure value onto the structural field to calculate the deformation of the split-type annular seal device. The leakage of the split-type annular seal device is calculated based on the established leakage formula of the split-type annular seal device. This method can accurately simulate the working environment of the split-type annular seal device, avoid repeated experiments, shorten the experimental cycle, reduce experimental expenses, and quickly analyze the performance differences at different speeds, temperatures, and pressures, providing guidance for the design and sealing improvement of the split-type annular seal device.

[0007] A method for calculating the leakage of a split-flap annular sealing device comprises the following steps:

[0008] Step 1: Establish structural region model and fluid region model;

[0009] Step 2: Divide the structural area model and the fluid area model and perform grid division;

[0010] Step 3: Establish a temperature field-flow field coupling analysis model for the split-petal annular sealing device;

[0011] Step 4: Set the boundary conditions for the temperature field-flow field coupling analysis of the split-type annular seal device;

[0012] Step 5: Set the material property parameters for the temperature field-flow field coupling analysis of the split-type annular sealing device;

[0013] Step 6: Use the steady-state calculation model, set the number of calculation steps and the iteration step size, calculate the temperature field-flow field coupling analysis results of the split-flap annular seal device, and obtain the pressure value of the oil on the inner surface of the dynamic seal seat and the temperature value of the dynamic seal seat;

[0014] Step 7: In the Mechanical software, establish a model for temperature field-flow field-structure field coupling analysis;

[0015] Step 8: Set the boundary conditions for temperature field-flow field-structure field coupling analysis;

[0016] Step 9: Calculate the deformation of the split-type annular seal during the temperature field-flow field-structure field coupling analysis, extract the radial sealing surface deformation value and the axial sealing surface deformation value, and calculate the leakage amount G based on the established split-type annular seal leakage model.

[0017] Furthermore, in step 2, in order to improve the quality of mesh division, the structural area model and the fluid area model are divided. The structural area model is divided into the dynamic seal seat, petal ring, axial sealing surface, radial sealing surface, and inner surface of the dynamic seal seat; the fluid area model is divided into the oil collecting pipe, oil drain nozzle, cooling cavity, and guide plate cavity.

[0018] Furthermore, in step 2, the mesh size Min Size is no greater than 0.1 mm, and the petal ring, radial sealing surface, and axial sealing surface are divided into tetrahedral meshes using the Proximity and Curvature method;

[0019] The mesh size is no more than 0.1 mm. The dynamic seal seat, oil collecting pipe, oil drain nozzle, inner surface of the dynamic seal seat, cooling cavity, and guide plate cavity are divided into hexahedral meshes using the Sweep Method. The mesh result file is loaded into the Fluent software.

[0020] Furthermore, in step three, the temperature field-flow field coupling analysis model of the split-type annular sealing device includes: the oil collecting pipe, oil drain nozzle, cooling cavity, and guide plate cavity included in the fluid area model use the Realizablek-ε model and VOF model to simulate the flow of oil; the dynamic seal seat, split ring, axial sealing surface, radial sealing surface, and inner surface of the dynamic seal seat included in the structural area model use the Energy model to simulate the frictional heat generation, convection heat transfer and cooling heat exchange of the split-type annular sealing device; the inner surface of the dynamic seal seat uses the interface model to realize temperature data interaction; the oil collecting pipe, oil drain nozzle, cooling cavity, and guide plate cavity included in the fluid area model use the Gravity model to simulate the influence of gravity on the oil flow.

[0021] Furthermore, in step 4, the boundary conditions are set as follows: the heat flux model is used to apply frictional heat to the radial sealing surface, and the convective heat transfer model is used to transfer the heat of the gas cavity to the dynamic seal seat; the flow field boundary conditions are: the pressure-inlet model is used for the oil receiving pipe, the outflow model is used for the oil drain nozzle, and the sliding grid is used for the inner surface of the dynamic seal seat. The oil inlet temperature and operating speed of the oil receiving pipe are set.

[0022] Furthermore, in step seven, the model establishment process of the temperature field-flow field-structural field coupling analysis is as follows: the petal ring uses contact stress load to simulate the influence of gas cavity pressure and structural unbalanced force, and the axial sealing surface and radial sealing surface use Frictional model, and the friction coefficient is not greater than 0.2 to simulate the rotational friction between the axial contact surface and the radial contact surface.

[0023] Furthermore, in step eight, the boundary conditions are set as follows: the temperature field-flow field coupling analysis results are loaded into the structural field, including the oil pressure value on the inner surface of the dynamic seal seat and the temperature value of the dynamic seal seat as the boundary conditions of the structural field, setting the physical properties of the petal ring material, setting the rotation speed of the dynamic seal seat, and setting the petal ring structure constraint to free deformation.

[0024] Furthermore, in step nine, the leakage amount G is calculated as follows:

[0025]

[0026] Among them, h1 and h2 are the radial and axial deformation values ​​of the sealing surface respectively;

[0027] L1 and L2 are radial sealing surface width and axial sealing surface width;

[0028] μ n is the dynamic viscosity of nitrogen;

[0029] R is the radius of the dynamic seal seat;

[0030] ρ is the density of nitrogen;

[0031] ΔP is the pressure difference;

[0032] g is the acceleration due to gravity;

[0033] G is the leakage amount.

[0034] The beneficial effects of this application are:

[0035] 1) The present invention is mainly used for calculating the leakage of a split-type annular sealing device. The deformation of the split-type annular sealing device is calculated by using the temperature field, flow field, and structure field coupling analysis. The leakage value is further calculated based on the established leakage model.

[0036] 2) The present invention establishes temperature and flow field models applicable to the split-type annular seal device, simulates the heat generation, convection heat transfer, and cooling heat exchange of the oil in the split-type annular seal device, and simulates the flow process of the oil in the split-type annular seal device, ensuring that the numerical analysis is closer to the actual working conditions;

[0037] 3) The present invention uses a numerical analysis method to calculate the distribution law of the calculation results of the split-petal annular sealing device, overcoming the limitation that the distribution law of the temperature field, flow field, and structural field is difficult to measure during the experiment;

[0038] 4) When the structure of the split-type annular sealing device is improved or the working conditions change, the present invention can quickly calculate the leakage amount, save experimental funds, shorten the development cycle, and promote the improvement and promotion of the split-type annular sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a flow chart of the calculation method;

[0040] Figure 2 It is a split-flap annular sealing device;

[0041] Figure 3 It is the structural area model of the split-flap annular sealing device;

[0042] Figure 4 This is the flow field model of the split-flap annular seal device;

[0043] Figure 5 The deformation cloud diagram of the petal ring when the temperature field, flow field and structure field are coupled into a multi-physics field;

[0044] Explanation of numbers in the figure: 1 dynamic seal seat, 2 petal ring, 3 limit ring, 4 guide plate, 5 oil collecting pipe, 6 rotating shaft, 7 oil drain nozzle, 8 axial sealing surface, 9 radial sealing surface, 10 inner surface of dynamic seal seat, 11 cooling chamber, 12 guide plate cavity. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0046] The terms "first," "second," and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0047] A method for calculating the leakage of a split-flap annular sealing device comprises the following steps:

[0048] 1) Establish structural region model and fluid region model;

[0049] 2) Segment the structural and fluid domain models and perform meshing: the structural domain model is divided into the dynamic seal seat, petal ring, axial sealing surface, radial sealing surface, and inner surface of the dynamic seal seat; the fluid domain model is divided into the oil receiving pipe, oil drain nozzle, cooling cavity, and guide plate cavity;

[0050] Set the mesh size to 0.1mm and mesh the petal ring, radial sealing surface, and axial sealing surface into tetrahedral meshes using the Proximity and Curvature method. Set the mesh size to 0.1mm and mesh the dynamic seal seat, oil collecting pipe, oil drain nozzle, dynamic seal seat inner surface, cooling cavity, and guide plate cavity into hexahedral meshes using the Sweep Method method. Load the mesh result file into the Fluent software.

[0051] 3) Establish a model for temperature field-flow field coupling analysis of the split-type annular seal device. The model mainly includes: the Realizable k-ε model and VOF model are used to simulate the flow of oil in the oil receiving pipe, oil drain nozzle, cooling cavity, and guide plate cavity included in the fluid area model; the Energy model is used to simulate the friction heat generation, convection heat transfer and oil cooling heat exchange of the split-type annular seal device in the dynamic seal seat, split ring, axial sealing surface, radial sealing surface, and inner surface of the dynamic seal seat in the structural area model; the interface model is used to realize temperature data interaction on the inner surface of the dynamic seal seat; the Gravity model is used to simulate the influence of gravity on oil flow in the oil receiving pipe, oil drain nozzle, cooling cavity, and guide plate cavity included in the fluid area model;

[0052] 4) Set the boundary conditions for the temperature field-flow field coupling analysis of the split-flap annular seal device. For the temperature field boundary conditions, a heat flux model is used to apply frictional heat to the radial sealing surface, and a convective heat transfer model is used to transfer heat from the gas cavity to the dynamic seal seat. For the flow field boundary conditions, a pressure-inlet model is used for the oil receiving pipe, an outflow model is used for the oil drain nozzle, and a sliding mesh is used for the inner surface of the dynamic seal seat. The oil inlet temperature and operating speed of the oil receiving pipe are set.

[0053] 5) Set the physical parameters for the temperature field-flow field coupling analysis of the split-flap annular seal device, including the material physical parameters of the dynamic seal seat, oil, and air;

[0054] 6) Using a steady-state calculation model, setting the number of calculation steps and the iteration step size, the temperature field-flow field coupling analysis results of the split-flap annular seal device are calculated to obtain the pressure value of the oil on the inner surface of the dynamic seal seat and the temperature value of the dynamic seal seat;

[0055] 7) In the mechanical software, a temperature field-flow field-structure field coupling analysis model was established. The model included using contact stress loads on the petal ring to simulate the gas chamber pressure and the influence of structural imbalance forces. The axial and radial sealing surfaces used the Frictional model, and the friction coefficient was no more than 0.2 to simulate the rotational friction between the axial and radial contact surfaces.

[0056] 8) Set the boundary conditions for the temperature field-flow field-structure field coupling analysis and load the temperature field-flow field coupling analysis results into the structural field, including using the oil pressure value on the inner surface of the dynamic seal seat and the temperature value of the dynamic seal seat as the boundary conditions of the structural field, setting the material properties of the petal ring, setting the rotation speed of the dynamic seal seat, and setting the petal ring structure constraint to free deformation;

[0057] 9) Calculate the deformation of the split-type annular seal during the temperature field-flow field-structure field coupling analysis, extract the radial sealing surface deformation value and the axial sealing surface deformation value, and calculate the leakage amount G based on the established split-type annular seal leakage model.

[0058] Furthermore, in step 3), the VOF two-phase flow model is set with oil as the main phase and air as the secondary phase. In the initial state, the oil-liquid volume fraction of the fluid region is 0, and the air volume fraction is 100%.

[0059] Furthermore, in step 8), the temperature field-flow field coupling analysis results are loaded into the structural field, mainly including taking the pressure value of the oil on the surface of the dynamic seal seat and the temperature value of the dynamic seal seat as the boundary conditions of the structural field.

[0060] Furthermore, the leakage model of the split-flap annular sealing device in step 9) is formula (1), which is:

[0061]

[0062] Where, h1 and h2 are the radial and axial deformation values ​​of the sealing surface, respectively.

[0063] L1 and L2 are radial sealing surface width and axial sealing surface width;

[0064] μ n is the dynamic viscosity of nitrogen;

[0065] R is the radius of the dynamic seal seat;

[0066] ρ is the density of nitrogen;

[0067] ΔP is the pressure difference;

[0068] g is the acceleration due to gravity;

[0069] G is the leakage amount.

[0070] Example 1

[0071] The present invention provides a method for calculating the leakage of a petal-type annular sealing device. The calculation process is as follows: Figure 1 As shown, the method includes the following steps:

[0072] 1. According to Figure 2Differentiated annular sealing device, establish the structural area model of the split-petal annular sealing device as follows Figure 3 , establish the fluid region model as Figure 4 ;

[0073] 2. Import the structural domain model and the flow field domain model into Workbench, and split the structural domain model and the fluid domain model. The structural domain model is divided into the dynamic seal seat 1, the petal ring 2, the axial sealing surface 8, the radial sealing surface 9, and the dynamic seal seat inner surface 10. The fluid domain model is divided into the oil collecting pipe 5, the oil drain nozzle 7, the cooling cavity 11, and the guide disk cavity 12. When dividing the mesh, set the mesh size Min Size to 0.1mm. Use the Proximity and Curvature method to divide the petal ring 2, the axial sealing surface 8, and the radial sealing surface 9 into tetrahedral meshes, and set the mesh size Min Size to 0.1mm. Use the Sweep Method method to divide the dynamic seal seat 1, the oil collecting pipe 5, the oil drain nozzle 7, the dynamic seal seat inner surface 10, the cooling cavity 11, and the guide disk cavity 12 into hexahedral meshes. Load the mesh result file into the Fluent software;

[0074] 3. Establish a model for the temperature field-flow field coupling analysis of the split-flap annular sealing device, which mainly includes: activating the Realizable k-ε model and VOF model for the oil collecting pipe 5, the oil drain nozzle 7, the cooling chamber 11, and the guide disc cavity 12, wherein the VOF model sets the oil as the main phase and the air as the secondary phase, and the oil volume fraction in the fluid region is set to 0, and the air volume fraction is set to 100%; activating the Energy model for the dynamic seal seat 1, the split-flap ring 2, the axial sealing surface 8, the radial sealing surface 9, and the inner surface 10 of the dynamic seal seat, and setting the initial temperature to 25°C; setting the inner surface 10 of the dynamic seal seat to the interface model, activating the Gravity model for the guide disc cavity 12, and setting the y direction to -9.8 m / s 2 ;

[0075] 4. Set the boundary conditions for the temperature field-flow field coupling analysis of the split-type annular sealing device, where the temperature field boundary conditions mainly include: the friction heat flux of the radial sealing surface 9 is 55021J / (m 2 ·s), activate the Convection model, where the gas cavity temperature is 170℃ and the heat transfer coefficient is 460W / (m 2 ·℃); the flow field boundary conditions mainly include: the oil receiving pipe 5 adopts the Pressure-inlet model with a pressure of 0.46 MPa, the oil drain nozzle 7 adopts the outflow model, the inner surface 10 of the dynamic seal seat adopts the sliding grid, the oil inlet temperature of the oil receiving pipe 5 is set to 120℃, and the operating speed is set to 10715 r / min.

[0076] 5. Set the physical parameters for the temperature field-flow field coupling analysis of the split-flap annular seal device, including the material physical parameters of the dynamic seal seat, oil, and air:

[0077] The material of dynamic seal seat 1 is usually alloy steel: set density 7500kg / m 3 , thermal conductivity 64.1W / (m·K), specific heat capacity 0.35kJ / (kg·K), elastic modulus 20.1×10 4 MPa, Poisson's ratio 0.21;

[0078] Oil physical parameters: Set the oil density to 974.8kg / m 3 , thermal conductivity 0.157W / (m·K), specific heat capacity 2.05kJ / (kg·K), kinematic viscosity 5.02mm 2 ·s;

[0079] Air physical parameters: Set air density to 0.791kg / m 3 , thermal conductivity 0.034W / (m·K), specific heat capacity 1.02kJ / (kg·K), kinematic viscosity 15.18mm 2 ·s;

[0080] 6. Using the steady-state calculation model, set the calculation step number to 1000 and the iteration step size to 0.05. Click the Calculate option to calculate the temperature field-flow field coupling analysis results of the split-flap annular seal device, and obtain the oil pressure value on the inner surface 10 of the dynamic seal seat and the temperature value of the dynamic seal seat 1.

[0081] 7. In the mechanical software, a temperature field-flow field-structure field coupling analysis model was established. The model included using contact stress to simulate the effects of gas chamber pressure and structural unbalanced force. The main factors included the gas chamber pressure on the surface of the petal ring 2 being 0.6 MPa and the unbalanced load at the contact position of the petal ring 2 being 5.01 MPa. The Frictional model was used, and the friction coefficient of the axial sealing surface 8 and the radial sealing surface 9 was set to 0.11.

[0082] 8. Set the boundary conditions for the temperature field-flow field-structure field coupling analysis. Through the data interaction interface between Fluent and Mechnical, load the temperature field-flow field coupling analysis results into the structural field. This mainly includes setting the oil pressure value on the inner surface 10 of the dynamic seal seat and the temperature value of the dynamic seal seat 1 as the boundary conditions of the structural field. Set the material of the petal ring 2 to graphite, with a density of 1830 kg / m 3, thermal conductivity 60.6W / (m·K), specific heat capacity 0.85kJ / (kg·K), elastic modulus 1.2×104MPa, Poisson's ratio 0.31, set the speed of the dynamic seal seat 1 to 10715r / min, allow the dynamic seal seat 1 to rotate along the circumferential direction, and set the petal ring 2 to free deformation;

[0083] 9. Click Calculate to obtain the deformation of the petal-type annular seal during the temperature field-flow field-structure field coupling analysis. Figure 5 is the deformation cloud map of the petal ring 2; the deformation values ​​of the axial sealing surface 8 and the radial sealing surface 9 are extracted, and the leakage G is calculated to be 1.7×10 -4 m 3 / s.

[0084] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present invention is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0085] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better embodiment. The above describes the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, those skilled in the art can also make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the protection of the present invention.

Claims

1. A method for calculating the leakage of a split-flap annular sealing device, characterized in that: Here are the steps: Step 1: Establish structural region model and fluid region model; Step 2: Divide the structural area model and the fluid area model and perform grid division; Step 3: Establish a temperature field-flow field coupling analysis model for the split-flap annular sealing device; Step 4: Setting the boundary conditions for the temperature field-flow field coupling analysis of the split-flap annular sealing device; Step 5: Setting material property parameters for temperature field-flow field coupling analysis of the split-flap annular sealing device; Step 6: Use the steady-state calculation model, set the calculation steps and iteration step length, calculate the temperature field-flow field coupling analysis results of the split-flap annular sealing device, and obtain the pressure value of the oil on the inner surface of the dynamic seal seat and the temperature value of the dynamic seal seat; Step 7: In the Mechanical software, establish a model for temperature field-flow field-structure field coupling analysis; Step 8: Set the boundary conditions for temperature field-flow field-structure field coupling analysis; Step nine: Calculate the deformation of the split-flap annular seal during the temperature field-flow field-structural field coupling analysis, extract the radial sealing surface deformation value and the axial sealing surface deformation value, and calculate the leakage amount G based on the established split-flap annular seal leakage model.

2. The method according to claim 1, characterized in that In step 2, in order to improve the quality of meshing, the structural region model and the fluid region model are segmented, and the structural region model is divided into a dynamic seal seat, a petal ring, an axial sealing surface, a radial sealing surface, and an inner surface of a dynamic seal seat; The fluid area model is divided into the oil collecting pipe, oil drain nozzle, cooling cavity and guide plate cavity.

3. The method according to claim 2, characterized in that In step 2, the mesh size Min Size is no more than 0.1 mm, and the petal ring, radial sealing surface, and axial sealing surface are divided into tetrahedral meshes using the Proximity and Curvature method; The mesh size Min Size is no more than 0.1 mm. The dynamic seal seat, oil collecting pipe, oil drain nozzle, inner surface of the dynamic seal seat, cooling cavity, and guide plate cavity are divided into hexahedral meshes using the Sweep Method method, and the mesh result file is loaded into the Fluent software.

4. The method as claimed in claim 3, characterized in that In step three, the temperature field-flow field coupling analysis model of the split-type annular sealing device includes: the oil collecting pipe, oil drain nozzle, cooling cavity, and guide plate cavity included in the fluid area model use the Realizable k-ε model and VOF model to simulate the flow of oil; the dynamic seal seat, split ring, axial sealing surface, radial sealing surface, and inner surface of the dynamic seal seat included in the structure area model use the Energy model to simulate the friction heat generation, convection heat transfer and cooling heat exchange of the split-type annular sealing device; the inner surface of the dynamic seal seat uses the interface model to realize temperature data interaction; the oil collecting pipe, oil drain nozzle, cooling cavity, and guide plate cavity included in the fluid area model use the Gravity model to simulate the influence of gravity on the flow of oil.

5. The method as claimed in claim 4, characterized in that In step 4, the boundary conditions are set as follows: The heat flux model is used to apply friction heat to the radial sealing surface, and the Convection model is used to transfer the heat of the gas cavity to the dynamic seal seat through convection. The flow field boundary conditions are as follows: the pressure-inlet model is used for the oil receiving pipe, the outflow model is used for the oil drain nozzle, and the sliding grid is used for the inner surface of the dynamic seal seat. The oil inlet temperature and operating speed of the oil receiving pipe are set.

6. The method as claimed in claim 5, characterized in that In step seven, the model establishment process of temperature field-flow field-structural field coupling analysis is as follows: the petal ring uses contact stress load to simulate the influence of gas cavity pressure and structural unbalanced force, and the axial sealing surface and radial sealing surface use Frictional model, and the friction coefficient is not greater than 0.2 to simulate the rotational friction between the axial contact surface and the radial contact surface.

7. The method as claimed in claim 6, characterized in that In step eight, the boundary conditions are set as follows: the temperature field-flow field coupling analysis results are loaded into the structural field, including the oil pressure value on the inner surface of the dynamic seal seat and the temperature value of the dynamic seal seat as the boundary conditions of the structural field, setting the physical properties of the petal ring material, setting the dynamic seal seat rotation speed, and setting the petal ring structure constraint to free deformation.

8. The method as claimed in claim 7, characterized in that In step nine, the leakage G is calculated using the following formula: Among them, h1 and h2 are the radial sealing surface deformation values ​​and the axial sealing surface deformation values; L1, L2 are radial sealing surface width and axial sealing surface width; μ n is the dynamic viscosity of nitrogen; R is the radius of the dynamic seal seat; ρ is the density of nitrogen; ΔP is the pressure difference; g is the acceleration due to gravity; G is the leakage amount.

Images