Aero-engine rotor oil receiving ring analysis method oriented to multi-state oil receiving effect

Abstract

The invention discloses an aero-engine rotor oil receiving ring analysis method oriented to a multi-state oil receiving effect, and belongs to the technical field of aero-engines. Aiming at the oil receiving process of the aero-engine rotor oil receiving ring, a plurality of lubricating oil flow state evaluation parameters such as oil receiving efficiency, lubricating oil retention volume in a drainage basin and oil film thickness in a key oil collecting groove are obtained through simulation analysis, non-dimensionalization processing is carried out on the parameters respectively, and the values are multiplied by weight coefficients to obtain a plurality of lubricating oil flow state evaluation parameters. Comprehensive characterization parameters of the lubricating oil flow state in the rotor oil recovery process under the given rotating speed are obtained, and quantitative analysis is conducted on the rotor oil recovery process. The method can quantitatively analyze the lubricating oil flowing state in the rotor oil receiving process under different working rotating speeds, and evaluates the oil receiving effect of the aero-engine rotor oil receiving ring in the full rotating speed range through the change curve of the lubricating oil flowing state comprehensive characterization parameter in the aero-engine rotor oil receiving process along with the rotating speed. The method can be used for guiding the optimization design of the aero-engine rotor oil recovery structure.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine technology, specifically relating to an aero-engine rotor oil recovery ring analysis method for multi-state oil recovery effects. Background Art

[0002] In aero-engines, bearings have complex structures and motion states, and are subjected to variable load environments, making them highly susceptible to damage and failure. They are critical structures affecting normal engine operation. To improve bearing lifespan, efficient cooling and lubrication by the lubrication system are essential. The key to this is ensuring sufficient lubricating oil flow into the bearing to improve its working environment. During oil flow, the nozzle is a stationary component, while the oil collection ring is a rotating component, resulting in significant relative velocity between them. Furthermore, the relative distance between the nozzle and the oil collection ring means that oil leakage is highly likely to occur during the process from when the bearing leaves the nozzle until it is collected by the oil collection ring (the oil collection process). This leads to insufficient lubricating oil flowing into the bearing, affecting its cooling and lubrication effectiveness. Therefore, quantitative analysis of the oil collection process of the rotor oil collection ring is necessary. This is a crucial prerequisite for understanding the bearing's cooling and lubrication effect and subsequently optimizing the rotor oil collection ring structure.

[0003] During actual operation, aero-engines face a variety of complex operating conditions, with engine speeds constantly shifting according to changes in flight status. However, most existing methods for analyzing the oil collection effect of rotor oil collectors are based on specific engine speed conditions. When faced with frequent and significant engine speed changes in actual operating conditions, these methods struggle to comprehensively and accurately consider the complex impact on lubricating oil flow. Furthermore, existing analysis methods only focus on the single parameter of oil collection efficiency of the oil collector, failing to reflect the true flow state of the lubricating oil and making it difficult to guide the optimization of the oil collection effect. As a result, traditional methods for analyzing the oil collection effect of aero-engine rotor oil collectors have gradually revealed their limitations.

[0004] In summary, to meet the optimization design requirements of aero-engine oil recovery structure systems, a quantitative analysis method for the oil recovery process, considering the influence of different operating states, is needed to analyze the oil recovery effect during the oil recovery process of the rotor oil recovery ring, and to provide guidance for the optimization design of aero-engine rotor oil recovery structures. Summary of the Invention

[0005] Because quantitative analysis of the oil collection process of the rotor oil collection ring is lacking in the analysis of lubricating oil flow in aero-engine bearing cavities, it is difficult to guide the optimized design of the rotor oil collection ring structure. To solve the above technical problems, this invention provides an aero-engine rotor oil collection ring analysis method for multi-state oil collection effects. On the one hand, it addresses the limitation of traditional methods that only focus on a single speed state by proposing a comprehensive quantitative analysis method that considers multiple speed states. On the other hand, it utilizes computational fluid dynamics simulation to analyze parameters such as calculated oil collection efficiency, lubricating oil retention in the flow domain, and oil film thickness in key oil collection grooves, rationally allocates weights, and comprehensively considers the influence of each parameter on the comprehensive characterization parameters of the lubricating oil flow state, thus providing a quantitative analysis method. This invention considers speed variations and obtains evaluation parameters such as oil collection efficiency, lubricating oil retention in the flow domain, and oil film thickness in key oil collection grooves through simulation analysis. After dimensionless processing and weight coefficient calculation, comprehensive characterization parameters are obtained, enabling quantitative analysis of the oil collection effect under multiple states.

[0006] This invention takes into account rotational speed variations and obtains evaluation parameters such as oil collection efficiency, lubricating oil retention in the flow basin, and oil film thickness in key oil collection tanks through simulation analysis. After dimensionless processing and weighting coefficient calculation, comprehensive characterization parameters are obtained, which can quantitatively analyze the oil collection effect under multiple conditions.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An analysis method for the oil recovery ring of an aero-engine rotor, oriented towards multi-state oil recovery effects, includes the following steps:

[0009] S1. Based on the real model of the bearing cavity, the fluid domain of the oil collection process of the rotor oil collection ring of the aero-engine is appropriately simplified and modeled to obtain the rotor oil collection fluid domain model and determine other boundary conditions except for the rotational speed and flow rate.

[0010] S2, Determine the speed range and speed state point. and matching lubricating oil flow rate This forms the state points that need to be analyzed. ;

[0011] S3, iterates through n state points within the speed range, based on the rotor oil collection flow domain model in S1, and inputs the corresponding state points. Simulation calculations are performed; the oil recovery efficiency for each state is output and calculated. Lubricating oil retention And the oil film thickness of the key oil collection tank ;

[0012] S4, oil recovery efficiency under different conditions Lubricating oil retention And the oil film thickness of the key oil collection tank After dimensionless processing and applying corresponding weights, comprehensive characterization parameters of lubricating oil flow state during the rotor oil collection process at a given speed are obtained.

[0013] S5. Analyze the lubricating oil flow state at different operating speeds and plot the curves of the comprehensive characterization parameters as a function of speed; evaluate the oil collection effect of the rotor oil collection ring of the aero-engine across the entire speed range by using the curves of the comprehensive characterization parameters as a function of speed.

[0014] The present invention has the following beneficial effects:

[0015] 1. This invention can quantitatively analyze the oil collection process of the rotor oil collection ring, changing the situation where traditional methods lack qualitative analysis and making the analysis results more accurate.

[0016] 2. This invention considers multiple rotational speed states, thus enabling quantitative analysis of the lubricating oil flow state during the rotor oil collection ring process at different operating speeds. Compared to methods that do not consider speed changes, this invention can more comprehensively and realistically reflect actual working conditions.

[0017] 3. By obtaining comprehensive characterization parameters of the lubricating oil flow state during the oil collection process of the rotor oil collection ring at a given speed, and the curve of the comprehensive characterization parameters changing with the speed, this invention can intuitively and comprehensively analyze the lubricating oil flow state during the oil collection process of the rotor oil collection ring across the entire speed range. Attached Figure Description

[0018] Figure 1 This is a flowchart of an aero-engine rotor oil recovery ring analysis method for multi-state oil recovery effect according to the present invention;

[0019] Figure 2 This is a schematic diagram of the rotor oil collection ring oil collection flow path and the bearing oil delivery-slinging flow path in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the rotor oil collection ring oil collection fluid domain and the bearing oil delivery-slinging fluid domain in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the lubricating oil inlet and outlet flow rates in the oil collection fluid domain of the rotor oil collection ring in a specific embodiment of the present invention.

[0022] The attached figures are labeled as follows: 1. Nozzle, 2. Oil collection ring, 3. Oil collection process, 4. Oil delivery process, 5. Oil throwing process, 6. Inner ring of bearing, 7. Rolling element of bearing, 8. Bearing cage, 9. Outer ring of bearing, 10. Driving bevel gear, 11. Oil injection process, 12. Oil collection body area of ​​rotor oil collection ring, 13. Oil delivery-oil throwing fluid area. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0024] like Figure 1 As shown in the figure, an embodiment of the present invention provides an analysis method for the oil recovery ring of an aero-engine rotor oriented towards multi-state oil recovery effects, comprising the following steps:

[0025] S1. Model the fluid domain of the oil collection process in the rotor oil collection ring of the aero-engine, and determine the boundary conditions of the flow path, including:

[0026] Besides the rotational speed and flow rate parameters, relevant parameters such as the structural parameters of the bearing lubricating oil cavity and boundary conditions were determined. The fluid domain of the oil collection process of the aero-engine rotor oil collection ring was modeled. The chamfers, gaps between parts and some tolerance dimensions of the fluid domain model were appropriately simplified to make the entire fluid domain model have a certain integrity and facilitate subsequent analysis.

[0027] S2. Determine the speed range and the corresponding flow rate, including:

[0028] The speed range is determined based on different flight states within the flight envelope. Based on this, the speed state point that needs to be analyzed is determined. ( , (This involves considering the number of speed points to be considered) and determining the corresponding lubricating oil flow rate. This forms the state points that need to be analyzed. ;

[0029] S3, within the speed range The internal rotation speed is iterated, and the state point is input. Given the corresponding rotational speed and flow rate, calculate multiple sets of state points; perform simulation calculations; output and calculate the oil recovery efficiency for each set of states. Lubricating oil retention And the oil film thickness of the key oil collection tank ;

[0030] S4. The evaluation parameters of oil collection efficiency, lubricating oil retention, and oil film thickness of key oil collection groove under different conditions are processed into dimensionless parameters. According to the specific actual engineering conditions, reasonable weight coefficients are assigned to each dimensionless evaluation parameter. Multiplying the dimensionless evaluation parameters by the corresponding weight coefficients yields the comprehensive characterization parameters of the lubricating oil flow state during the oil collection process of the rotor oil collection ring at a given speed.

[0031] The comprehensive characterization parameters of the lubricating oil flow state during the rotor oil recovery ring process directly characterize the lubricating oil flow characteristics at a given speed. Based on actual engineering conditions, the oil recovery efficiency is... Lubricating oil retention And the oil film thickness of the key oil collection tank Apply appropriate weighting coefficients, and the selection of weighting coefficients should be able to comprehensively reflect the degree of influence of the corresponding parameters on the characterization parameters.

[0032] S5. Analyze the lubricating oil flow state at different operating speeds and plot the curves of the comprehensive characterization parameters as a function of speed. By using these curves, evaluate the lubricating oil flow state during the rotor oil collection ring's oil collection process across the entire speed range.

[0033] The method of this invention analyzes the oil collection efficiency of the rotor oil collection ring during the oil collection process in a rotor with a complex bearing cavity structure by inputting multiple state points. Lubricating oil retention And the oil film thickness of the key oil collection tank Multiple lubricating oil flow state evaluation parameters are dimensionless and multiplied by weighting coefficients to obtain comprehensive characterization parameters of lubricating oil flow state during the rotor oil collection ring process at a given speed, and quantitative analysis of the rotor oil collection ring process is performed.

[0034] Specifically, S1 includes:

[0035] S1.1 Based on the design scheme of the aero-engine in the bearing cavity, clarify the specific shape and relative position relationship of the bearing oil injector, oil receiving ring, and driving bevel gear, and establish a simulation model;

[0036] S1.2, when setting the inlet boundary conditions of the flow domain, the rotor oil collection ring uses the nozzle as the inlet boundary during the oil collection process. Since the nozzle continuously sprays oil, it can be set as the flow boundary condition.

[0037] S1.3, in the set area of ​​the lubricating oil leakage collection area (e.g., Figure 4 As shown When boundary conditions are applied, because the nozzle structure does not extend into the internal space of the oil-collecting ring, the lubricating oil ejected from the nozzle will first be exposed outside the oil-collecting structure before entering the internal space of the oil-collecting ring. This design is highly prone to lubricating oil leakage. In order to detect lubricating oil leakage at the nozzle, appropriate outlet boundary conditions need to be set at the nozzle position.

[0038] S1.4, at the axial outlet of the oil collection ring in the set flow area (e.g. Figure 4 As shown When setting boundary conditions, after the lubricating oil is collected by the oil collection ring, a certain pressure needs to be provided at the outlet of the oil collection ring before it can flow axially along the axial oil delivery groove. Therefore, when setting the outlet boundary conditions for the rotor oil collection ring process, it is necessary to consider the correlation between the rotor oil collection ring process and the subsequent oil delivery-slinging process, and this can be set as a pressure boundary condition.

[0039] Specifically, S2 includes:

[0040] Within the flight envelope, the flight state continuously changes, resulting in varying engine speeds and corresponding lubricating oil flow rates. Based on this, different engine speeds and their corresponding flow rates can be set as mutually matched state points. Subsequently, in computational fluid dynamics (CFD) software, the corresponding parameters are adjusted for these state points to simulate different states. Finally, each set of state points is sequentially input into the calculation example to perform cyclic calculations, thereby achieving the simulation analysis of rotor oil recovery ring oil collection in different flight states of an aero-engine.

[0041] Specifically, S3 includes:

[0042] S3.1 When setting the simulation time during simulation operations, the set duration should be no less than the time required for the rotor to rotate two revolutions.

[0043] S3.2, Let the flow rate of lubricating oil flowing into the oil delivery tank at each state point be... The total oil supply is The oil recovery efficiency is Then the formula for calculating the oil recovery efficiency can be expressed as:

[0044] ;

[0045] S3.3, Output lubricating oil retention amount Over time The data changes, and then the average value in the time domain is calculated. ;

[0046] S3.4, by analyzing the simulation cloud map of oil film thickness in the key oil collection tank, the oil film thickness is statistically analyzed. Over time The data changes, and then the average value in the time domain is calculated. ;

[0047] Specifically, S4 includes:

[0048] S4.1 Calculate the lubricating oil retention at each state point. With the maximum lubricating oil retention that the space allows The ratio (the selection of the maximum lubricating oil retention should be determined according to the specific engineering conditions) is used to dimensionlessly convert the output lubricating oil retention to obtain the dimensionless lubricating oil retention. :

[0049] ;

[0050] When the wall has a certain linear velocity, the simulation software outputs a fluid simulation cloud map at that linear velocity, calculates the thickness of different fluid boundary layers, and compares them to obtain the maximum thickness of the fluid boundary layer. The upper limit of the oil film thickness is set, and the following operation is performed on the oil film thickness to obtain the dimensionless oil film thickness. :

[0051] ;

[0052] Oil recovery efficiency Since it is already a dimensionless quantity, there is no need to perform a dimensionless transformation operation.

[0053] S4.2, assign appropriate weighting coefficients to each dimensionless parameter. ;

[0054] S4.3, based on oil recovery efficiency Dimensionless lubricating oil retention and oil film thickness Comprehensive analysis yields comprehensive characterization parameters of the lubricating oil flow state during the rotor oil collection ring process at a given rotational speed. :

[0055] ;

[0056] in, These are the weighting coefficients for the dimensionless evaluation parameters of oil recovery efficiency, lubricating oil retention, and oil film thickness, respectively, and they have... .

[0057] Specifically, S5 includes:

[0058] S5.1 Analyze the lubricating oil flow state at different operating speeds and plot the curves of the comprehensive characterization parameters as a function of speed.

[0059] S5.2, by comprehensively characterizing the curves of parameter changes with rotational speed, evaluate and analyze the lubricating oil flow state during the oil collection process of the rotor oil collection ring across the entire rotational speed range.

[0060] like Figures 2-4 As shown, the method of the present invention is illustrated by a specific embodiment:

[0061] Based on the design scheme of the bearing cavity in the aero engine Figure 2This diagram illustrates the flow path of lubricating oil supplied under the bearing ring of an aero-engine. Lubricating oil is sprayed out at a certain angle through nozzle 1, which is the oil spraying process 11. The sprayed lubricating oil is collected by the oil collection ring 2, which is the rotor oil collection ring collection process 3. Subsequently, the lubricating oil flows axially or radially along the flow channel formed by grooves and small holes on components such as the inner bearing ring 6 and the drive bevel gear 10. Finally, under the action of centrifugal force, it is thrown to positions such as the bearing rolling elements 7, the bearing cage 8, and the outer bearing ring 9. This process is called the oil supply process 4-oil throwing process 5. After the lubricating oil is thrown out from the oil throwing hole under the ring, it cools and lubricates the bearing.

[0062] in accordance with Figure 2 The flow path diagram and the flow state of lubricating oil in the chamber divide the flow process of lubricating oil into the rotor oil collection ring oil collection process and the oil delivery-slinging process. Therefore, it can be divided into the rotor oil collection ring oil collection process 12 and the oil delivery-slinging fluid domain 13.

[0063] S1, This invention mainly analyzes the oil collection process of the rotor oil collection ring, such as Figure 2 In the oil collection process 3 and the injection process 11, relevant parameters other than speed and flow rate are determined, such as the structural parameters of the bearing lubricating oil cavity and boundary conditions. The oil collection fluid domain of the rotor oil collection ring is modeled, and the fluid domain model is appropriately simplified, such as... Figure 3 The oil injection process is shown in Figure 11;

[0064] The approximate range of the oil collection fluid domain and the composition of the lubricating oil flow rate of the rotor oil collection ring are as follows: Figure 4 As shown, the following are: 1) Lubricating oil inlet flow rate at the nozzle inlet position. This corresponds to the oil supply flow rate of the bearing oil supply nozzle during the actual lubricating oil flow process. The magnitude of this flow rate is controlled by the inlet boundary conditions of the flow control system, and its magnitude is constant; 2) the lubricating oil flow rate discharged from the fluid domain through the rear outlet boundary position. This corresponds to the actual flow rate of lubricating oil flowing into the axial oil delivery groove during the actual lubricating oil flow process; 3) the external lubricating oil flow rate leaking out through the outlet boundary on the front side of the oil receiving ring. This corresponds to the flow rate of lubricating oil that leaks out during the actual lubricating oil flow process because it cannot be collected by the oil collection ring in time;

[0065] S2 determines the speed range based on different flight states within the flight envelope. Based on this, the speed state point that needs to be analyzed is determined. ( , (This involves considering the number of speed points to be considered) and determining the corresponding lubricating oil flow rate. This forms the state points that need to be analyzed. ;

[0066] S3 performs simulation calculations in computational fluid dynamics (CFD) software, outputs relevant data, and preprocesses the data;

[0067] S4 is a post-processing of the oil collection efficiency, lubricating oil retention, and oil film thickness data in the key oil collection groove output under multiple states of the rotor oil collection ring's oil collection stroke.

[0068] S5 analyzes the lubricating oil flow state at different operating speeds and plots curves showing the changes of comprehensive characterization parameters with speed. These curves evaluate the lubricating oil flow state during the rotor oil collection ring's oil collection process across the entire speed range.

[0069] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, alterations, substitutions, or variations made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects, characterized in that, Includes the following steps: S1. Based on the real model of the bearing cavity, the fluid domain of the oil collection process of the rotor oil collection ring of the aero-engine is appropriately simplified and modeled to obtain the rotor oil collection fluid domain model and determine other boundary conditions except for the rotational speed and flow rate. S2, Determine the speed range and speed state point. and matching lubricating oil flow rate This forms the state points that need to be analyzed. ; S3, iterates through n state points within the speed range, based on the rotor oil collection flow domain model in S1, and inputs the corresponding state points. Simulation calculations are performed; the oil recovery efficiency for each state is output and calculated. Lubricating oil retention And the oil film thickness of the key oil collection tank ; S4, oil recovery efficiency under different conditions Lubricating oil retention And the oil film thickness of the key oil collection tank After dimensionless processing and applying corresponding weights, comprehensive characterization parameters of lubricating oil flow state during the rotor oil collection process at a given speed are obtained. S5. Analyze the lubricating oil flow state at different operating speeds and plot the curves of the comprehensive characterization parameters as a function of speed. Through the curves of the comprehensive characterization parameters as a function of speed, evaluate the oil collection effect of the rotor oil collection ring of the aero-engine across the entire speed range.

2. The method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects as described in claim 1, characterized in that, S1 includes: S1.1, Define the shape and relative position of components related to the oil recovery process of the aero-engine rotor, and establish a simulation model; S1.2, when setting the inlet boundary conditions of the flow domain, the nozzle is used as the inlet boundary in the rotor oil collection process, and it is set as the flow boundary condition.

3. The method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects as described in claim 2, characterized in that, S1 further includes: S1.3, Set the corresponding outlet boundary conditions at the nozzle position.

4. The method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects as described in claim 3, characterized in that, S1 further includes: S1.4 When setting the outlet boundary conditions for the rotor oil receiving ring oil receiving process, the correlation between the rotor oil receiving ring oil receiving process and the subsequent oil delivery-oil throwing process is considered, and it is set as a pressure boundary condition.

5. The method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects as described in claim 2, characterized in that, S2 includes: determining the rotational speed range based on the flight state within the flight envelope. Based on this, the speed state point that needs to be analyzed is determined. , , The number of rotational speed points to be considered; determine the relationship with Matching lubricating oil flow rate This forms the state points that need to be analyzed. .

6. The method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects as described in claim 3, characterized in that, S3 includes: S3.1 When setting the simulation time during simulation operations, the set duration should be no less than the time required for the rotor to rotate two revolutions. S3.2, the oil recovery efficiency is obtained by dividing the flow rate of lubricating oil into the oil tank at each state point by the total oil supply: 。 7. The method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects as described in claim 3, characterized in that, S3 further includes: S3.3, Output lubricating oil retention amount Over time The data changes, and then the average value in the time domain is calculated. ; S3.4, by analyzing the simulation cloud map of oil film thickness in the key oil collection tank, the oil film thickness is statistically analyzed. Over time The data changes, and then the average value in the time domain is calculated. .

8. The method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects as described in claim 4, characterized in that, S4 includes: S4.1, the output oil recovery efficiency, lubricating oil retention, and oil film thickness are processed to be dimensionless, resulting in a dimensionless oil recovery efficiency. Lubricating oil retention and oil film thickness ; S4.2 assigns appropriate weighting coefficients to each dimensionless parameter.

9. The method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects as described in claim 4, characterized in that, S4 further includes: S4.3, based on oil recovery efficiency Dimensionless lubricating oil retention and oil film thickness Comprehensive analysis yields comprehensive characterization parameters of the lubricating oil flow state during the rotor oil collection ring process at a given rotational speed. : ； in, These are the weighting coefficients for the dimensionless evaluation parameters of oil recovery efficiency, lubricating oil retention, and oil film thickness, respectively, and they have... .

10. The method for analyzing the oil recovery ring of an aero-engine rotor for multi-state oil recovery effects as described in claim 5, characterized in that, S5 includes: S5.1 Analyze the lubricating oil flow state at different operating speeds and plot the curves of the comprehensive characterization parameters as a function of speed; S5.2, by comprehensively characterizing the curves of parameter changes with rotational speed, evaluate and analyze the lubricating oil flow state during the oil collection process of the rotor oil collection ring across the entire rotational speed range.

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