CN116227091A - Simulation analysis method for oil recovery process of intermediate bearing lubricating oil - Google Patents
Simulation analysis method for oil recovery process of intermediate bearing lubricating oil Download PDFInfo
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Abstract
The invention belongs to the field of simulation analysis of lubricating oil of an aeroengine based on the assistance of computer software, and discloses a simulation analysis method of a lubricating oil collecting process of an intermediate bearing.
Description
Technical Field
The invention belongs to the field of simulation analysis of lubricating oil of an aeroengine based on the assistance of computer software, and particularly relates to a simulation analysis method for an intermediate bearing lubricating oil collecting process.
Background
Modern advanced aeroengines use widely bearing solutions with intermediate bearings in the structural layout to reduce the number of load-bearing frames for weight reduction. So-called intermediate bearings, i.e., an inner ring and an outer ring of the bearings are mounted on the high-pressure rotor and the low-pressure rotor, respectively, and thus the mounting and dismounting of the intermediate bearings are difficult. For modern aero-engines, due to rotor dynamics, a structure of high-pressure rotor and low-pressure rotor counter-rotating is often adopted, and when in operation, the inner ring and the outer ring of the bearing rotate at the rotating speeds of the high-pressure rotor and the low-pressure rotor respectively, and at the moment, the relative rotating speed between the inner ring and the outer ring of the intermediate bearing is very high, so that extremely high requirements are put on the design and maintenance of the bearing. The intermediate fulcrum is often positioned at the turbine end behind the combustion chamber, so that the intermediate bearing needs efficient lubrication and cooling to ensure the working reliability of the intermediate bearing due to the severe high-temperature working environment.
In the design stage, the lubricating effect of the intermediate bearing is often evaluated by adopting a simulation calculation mode, and relevant structural parameters (Zhu Donglei, chen Guoding, li Yanjun, and the like) of a lubricating oil flow path are determined. However, for the intermediate bearing, on one hand, the complex counter-rotating motion state makes the simulation of the lubricating oil flow characteristic more difficult, and on the other hand, the complex intermediate bearing structure makes the shape of the lubricating oil flow path complex, so that the determination of the relative structural parameters of the lubricating oil flow path is more difficult to realize by adopting the traditional simulation analysis method.
The process of the flow of the lubricating oil in the counter-rotating intermediate bearing in the working state can be divided into three stages according to the boundary rotation speed of the wall surface: an inner rotor oil collecting-conveying process, an outer rotor oil collecting-conveying process and a bearing inner ring oil collecting-conveying process; considering that the boundary conditions of the fluid domain speeds in the three stages have larger differences, and the sizes of the models have larger differences, if the three stages are taken as a whole, a corresponding fluid domain model is established to analyze the lubricating oil flowing process, the problems of overlarge grid number and excessively complex model boundaries are inevitably caused, and the calculation efficiency and the calculation accuracy are influenced.
Based on the method, the intermediate bearing lubricating oil collecting process is necessarily simplified, the three processes are subjected to sectional simulation, and the lubricating oil conveying quantity between adjacent oil conveying processes is used as an intermediate quantity to correlate the processes, so that the lubricating oil complex flowing process can be decomposed, the wall surface movement boundary condition in the simulation process is prevented from being too complex, and the solving difficulty is reduced on the premise of ensuring the solving precision.
Disclosure of Invention
The invention aims to solve the technical problems that: in consideration of extremely complex oil collecting process of intermediate bearing lubricating oil of aeroengine, the difficulty of simulation analysis on the lubricating oil flow is high, in order to overcome the defects of the existing simulation analysis method, the intermediate bearing lubricating oil collecting process is simplified in a sectional simulation mode, and a plurality of processes are related by using the lubricating oil conveying quantity between adjacent oil conveying processes as intermediate quantity, so that the calculation is simplified on the premise of ensuring the simulation precision, and the technical scheme adopted by the invention is as follows:
a simulation analysis method for an intermediate bearing lubricating oil receiving process comprises the following steps:
and 4, when the sectional simulation calculation is solved, the outflow quantity of the lubricating oil of the front flow path is used as the input quantity of the lubricating oil of the adjacent rear flow path, so that the three flow paths are connected in series in sequence.
Further, the step 1 includes:
step 1.1, determining the shapes and relative position relations of a bearing inner ring, a bearing outer ring, an inner rotor, an outer rotor and an oil collecting ring;
and 1.2, selecting a flow path of lubricating oil which is sprayed out from a nozzle and flows to an inner ring of the bearing as a total flow path according to the shape and the position relation of the bearing and the inner and outer rotors determined in the step 1.1.
Further, in the step 2, when the total flow path is segmented:
the wall surface of the total flow path determined in the step 1.2 is formed by an inner ring of a bearing, an inner rotor, an outer rotor and an oil collecting ring, and the total flow path is divided into an inner rotor oil collecting-conveying process, an outer rotor oil collecting-conveying process and an inner ring oil collecting-conveying process according to structures of the wall surface formed at different positions in the total flow path in a sequential relationship.
Further, the oil collecting and delivering process of the inner rotor is a flowing process of lubricating oil from the nozzle to an oil collecting groove between the inner rotor and the outer rotor, and the wall surface of the section of flow path is formed by the inner rotor and the oil collecting ring;
the outer rotor oil collecting and conveying process is a flowing process of lubricating oil from an oil collecting groove between the inner rotor and the outer rotor to an annular cavity between the outer rotor and an inner ring of the bearing, and the wall surface of the section of flow path is formed by the inner rotor and the outer rotor;
the process of collecting and delivering oil from the inner ring of the bearing is a flowing process of lubricating oil from an annular cavity between the outer rotor and the inner ring of the bearing to the rolling bodies of the bearing, and the wall surface of the section of flow path is formed by the outer rotor and the inner ring of the bearing.
Further, in the step 3, the method includes:
step 3.1, respectively establishing three-dimensional solid models corresponding to the three sections of flow paths through software according to the specific shapes and the relative position relations of the bearing inner ring, the bearing outer ring, the inner rotor, the outer rotor and the oil collecting ring analyzed in the step 1.1;
step 3.2, differentiating the three-dimensional solid model by Boolean operation to obtain three corresponding fluid domain models;
and 3.3, applying corresponding boundary conditions according to the composition of the wall surface of each section of the flow path in the step 2, and respectively performing lubricating oil flow simulation calculation on each fluid domain model.
Further, in the step 4, the method includes:
step 4.1, calculating to obtain the outflow of the lubricating oil in the oil collecting and conveying process of the inner rotor according to the input quantity of the lubricating oil given in the design as the input quantity of the lubricating oil in the oil collecting and conveying process of the inner rotor;
step 4.2, calculating to obtain the outflow of the lubricating oil in the outer rotor oil collecting-conveying process according to the outflow of the lubricating oil in the inner rotor oil collecting-conveying process, wherein the outflow is used as the input of the lubricating oil in the outer rotor oil collecting-conveying process;
and 4.3, calculating to obtain the outflow of the lubricating oil in the oil collecting and transporting process of the inner ring of the bearing according to the outflow of the lubricating oil in the oil collecting and transporting process of the outer rotor, wherein the outflow is the amount of the lubricating oil entering the inner ring of the bearing after being sprayed out from the nozzle.
The invention has the following beneficial effects:
1. the invention provides a novel simulation analysis method for the oil collecting process of intermediate bearing lubricating oil, which is characterized in that through the analysis of boundary conditions of the wall surface of a lubricating oil flow path, the lubricating oil flow path of the intermediate bearing is divided into three sections of an inner rotor oil collecting-conveying process, an outer rotor oil collecting-conveying process and a bearing inner ring oil collecting-conveying process, and the three sections of flow paths are connected in series according to the sequence through the lubricating oil flow. Compared with the traditional method for overall modeling simulation of the total flow path, the method can reduce the solving difficulty on the premise of ensuring the solving precision;
2. in the design and optimization process of the complex lubricating oil flow path, the method can reduce and determine the related structural parameters of the lubricating oil flow path in a sectional mode, and simplify the design and optimization process.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic illustration of the intermediate bearing oil total flow path in an embodiment of the invention;
FIG. 3 is a schematic diagram of an inner rotor oil-handling-transporting process in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of an outer rotor oil collection-transportation process according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the oil-handling process of the inner ring of the bearing in accordance with an embodiment of the present invention;
in the figure: 1. the device comprises a nozzle, 2 an oil collecting ring, 3 an inner rotor, 4 a bearing outer ring, 5 a bearing inner ring, 6 an outer rotor, 7 an intermediate bearing lubricating oil collecting-conveying process, 8 an inner rotor collecting-conveying process, the oil collecting ring is characterized by comprising an oil collecting ring oil conveying hole, an inner rotor oil conveying hole, an outer rotor oil collecting-conveying process, an inner bearing ring oil conveying hole and an inner bearing ring oil collecting-conveying process.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 5 in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments, and the technical means used in the embodiments are conventional means known to those skilled in the art unless specifically indicated.
Referring to fig. 1, a simulation analysis method for an intermediate bearing lubricating oil receiving process comprises the following steps:
and 4, when the sectional simulation calculation is solved, the outflow quantity of the lubricating oil of the front flow path is used as the input quantity of the lubricating oil of the adjacent rear flow path, so that the three flow paths are connected in series in sequence.
According to the invention, aiming at the complex structure and motion relation of the intermediate bearing, the complex flow process of the lubricating oil is decomposed by a sectional simulation method, and the boundary condition of wall surface motion in the simulation process is avoided to be too complex, so that the solving difficulty is reduced on the premise of guaranteeing the solving precision.
In the design and optimization process of the complex lubricating oil flow path, the method can reduce and determine the related structural parameters of the lubricating oil flow path in a sectional mode, and simplify the design and optimization process.
Specifically, in step 1, when determining the total flow path of the lubricating oil flowing to the bearing inner ring after being ejected from the nozzle, the specific steps are as follows:
step 1.1, according to the design scheme of the aero-engine at the intermediate bearing, the specific shape and relative position relation of the bearing inner ring, the bearing outer ring, the inner rotor, the outer rotor and the oil collecting ring are defined;
and 1.2, selecting a flow path of lubricating oil which is sprayed out from a nozzle and flows to an inner ring of the bearing as a total flow path according to the shape and the position relation of the bearing and the inner and outer rotors determined in the step 1.1, and outlining the shape of the total flow path.
Specifically, in step 2, when the total flow path is segmented, the specific method is as follows:
the wall surface of the total flow path determined in the step 1.2 is formed by a bearing inner ring, an inner rotor, an outer rotor and an oil collecting ring. The motion states of different structures are different, so that the total flow path is divided into three sections of an inner rotor oil collecting-conveying process, an outer rotor oil collecting-conveying process and a bearing inner ring oil collecting-conveying process according to the composition structure of wall surfaces at different positions in the total flow path.
The inner rotor oil collecting and conveying process 8 is a flowing process of lubricating oil from the nozzle 1 to an oil collecting groove between the inner rotor and the outer rotor, the wall surface of the section of flow path is formed by the inner rotor 3 and the oil collecting ring 2, and the lubricating oil in the section of flow path flows in from the nozzle 1 and flows to the oil collecting groove between the inner rotor and the outer rotor through the inner rotor oil conveying hole 10;
the outer rotor oil collecting and conveying process 12 is a flowing process of lubricating oil from an inner-outer rotor oil collecting groove to an outer rotor-bearing inner ring space, the wall surface of the oil collecting-conveying process is formed by the inner rotor 3 and the outer rotor 6, and the lubricating oil in the flow path flows in from the inner rotor oil conveying hole 10 and flows to the outer rotor-bearing inner ring space through the outer rotor oil conveying hole 11;
the oil collecting and conveying process 14 of the inner ring of the bearing is a flowing process of lubricating oil from an annular cavity between the outer rotor and the inner ring of the bearing to the rolling bodies of the bearing, the wall surface of the oil collecting and conveying process is formed by the outer rotor 6 and the inner ring of the bearing, and the lubricating oil in the flow path flows in from the oil conveying hole 11 of the outer rotor and flows to the rolling bodies of the bearing through the oil conveying hole 13 of the inner ring of the bearing.
Specifically, in step 3, when performing simulation calculation on each segmented flow path, the specific steps are as follows:
step 3.1, respectively establishing three-dimensional solid models corresponding to three sections of flow paths, namely an inner rotor oil collecting-transporting process solid model, an outer rotor oil collecting-transporting process solid model and an inner bearing ring oil collecting-transporting process solid model by commercial modeling CFD software according to the specific shapes and relative position relations of the bearing inner ring, the bearing outer ring, the inner rotor, the outer rotor and the oil collecting ring analyzed in the step 1.1 and combining the decomposition scheme of the total flow paths in the step 2;
and 3.2, solving differences of the three-dimensional solid models established in the step 3.1 through Boolean operation to obtain three corresponding fluid domain models, wherein the three corresponding fluid domain models respectively correspond to the three stages shown in fig. 3, 4 and 5. It should be noted that, for the outlet position of each section of the flow path, enough space should be reserved so as to ensure the accuracy of the oil flow state in the drainage basin at the outlet;
and 3.3, applying corresponding boundary conditions, speeds, pressures or flow rates and the like to the three fluid domain models obtained in the step 3.2 according to the analysis of the wall surface composition of each section of flow path in the step 2, and respectively performing oil flow simulation calculation on each fluid domain model.
Specifically, in step 4, when the three channels are connected in series in order by using the outflow amount of the oil in the preceding channel as the input amount of the oil in the adjacent following channel, the specific steps are as follows:
step 4.1, calculating to obtain the outflow of the lubricating oil in the oil collecting and conveying process of the inner rotor according to the input quantity of the lubricating oil given in the design as the input quantity of the lubricating oil in the oil collecting and conveying process of the inner rotor;
step 4.2, aiming at the outflow of the lubricating oil in the oil collecting and conveying process of the inner rotor calculated in the step 4.1, taking the outflow as the input of the lubricating oil in the oil collecting and conveying process of the outer rotor, and calculating to obtain the outflow of the lubricating oil in the oil collecting and conveying process of the outer rotor;
and 4.3, calculating the outflow of the lubricating oil in the oil collecting and conveying process of the inner ring of the bearing by taking the outflow of the lubricating oil in the oil collecting and conveying process of the outer rotor calculated in the step 4.2 as the input of the lubricating oil in the oil collecting and conveying process of the inner ring of the bearing, wherein the outflow is the amount of the lubricating oil entering the inner ring of the bearing after the lubricating oil is sprayed out from a nozzle.
Referring to fig. 2-5, the method steps of the present invention are illustrated by one specific embodiment:
the inner rotor oil collecting and conveying process 8 is a flowing process of lubricating oil from the nozzle 1 to an oil collecting groove between the inner rotor and the outer rotor, the wall surface of the section of flow path is formed by the inner rotor 3 and the oil collecting ring 2, and the lubricating oil in the section of flow path flows in from the nozzle 1 and flows to the oil collecting groove between the inner rotor and the outer rotor through the inner rotor oil conveying hole 10;
the outer rotor oil collecting and conveying process 12 is a flowing process of lubricating oil from an inner-outer rotor oil collecting groove to an outer rotor-bearing inner ring space, the wall surface of the oil collecting-conveying process is formed by the inner rotor 3 and the outer rotor 6, and the lubricating oil in the flow path flows in from the inner rotor oil conveying hole 10 and flows to the outer rotor-bearing inner ring space through the outer rotor oil conveying hole 11;
the oil collecting and conveying process 14 of the inner ring of the bearing is a flowing process of lubricating oil from an annular cavity between the outer rotor and the inner ring of the bearing to the rolling bodies of the bearing, the wall surface of the oil collecting and conveying process is formed by the outer rotor 6 and the inner ring of the bearing, and the lubricating oil in the flow path flows in from the oil conveying hole 11 of the outer rotor and flows to the rolling bodies of the bearing through the oil conveying hole 13 of the inner ring of the bearing.
and 4, when the sectional simulation calculation is solved, the outflow quantity of the lubricating oil of the front flow path is used as the input quantity of the lubricating oil of the adjacent rear flow path, so that the three flow paths are connected in series in sequence. The method comprises the following specific steps:
step 4.1, calculating to obtain the outflow of the lubricating oil in the oil collecting and conveying process of the inner rotor according to the input quantity of the lubricating oil given in design as the input quantity of the lubricating oil in the oil collecting and conveying process of the inner rotor in fig. 3;
step 4.2, regarding the outflow of the lubricating oil in the oil collecting and transporting process of the inner rotor calculated in the step 4.1, taking the outflow as the input of the lubricating oil in the oil collecting and transporting process of the outer rotor in fig. 4, and calculating to obtain the outflow of the lubricating oil in the oil collecting and transporting process of the outer rotor;
and 4.3, calculating the outflow of the lubricating oil in the oil collecting and conveying process of the inner ring of the bearing in the figure 5 by taking the outflow of the lubricating oil in the oil collecting and conveying process of the outer rotor calculated in the step 4.2 as the input of the lubricating oil in the oil collecting and conveying process of the inner ring of the bearing, wherein the outflow is the amount of the lubricating oil entering the inner ring of the bearing after the lubricating oil is sprayed out from a nozzle. The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications, variations, alterations, substitutions made by those skilled in the art to the technical solution of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the design of the present invention.
Claims (6)
1. A simulation analysis method for an intermediate bearing lubricating oil receiving process is characterized by comprising the following steps:
step 1, determining a total flow path of lubricating oil which is sprayed out from a nozzle and flows to an inner ring of a bearing;
step 2, segmenting a total flow path, wherein the total flow path at least comprises three sections of flow paths, namely an inner rotor oil collecting-conveying process, an outer rotor oil collecting-conveying process and a bearing inner ring oil collecting-conveying process from beginning to end;
step 3, performing simulation calculation on each segmented flow path;
and 4, when the sectional simulation calculation is solved, the outflow quantity of the lubricating oil of the front flow path is used as the input quantity of the lubricating oil of the adjacent rear flow path, so that the three flow paths are connected in series in sequence.
2. The simulation analysis method for the oil recovery process of the intermediate bearing lubricating oil according to claim 1, wherein the step 1 comprises the following steps:
step 1.1, determining the shapes and relative position relations of a bearing inner ring, a bearing outer ring, an inner rotor, an outer rotor and an oil collecting ring;
and 1.2, selecting a flow path of lubricating oil which is sprayed out from a nozzle and flows to an inner ring of the bearing as a total flow path according to the shape and the position relation of the bearing and the inner and outer rotors determined in the step 1.1.
3. The simulation analysis method for the oil recovery process of the intermediate bearing lubricating oil according to claim 2, wherein in the step 2, when the total flow path is segmented:
the wall surface of the total flow path determined in the step 1.2 is formed by an inner ring of a bearing, an inner rotor, an outer rotor and an oil collecting ring, and the total flow path is divided into an inner rotor oil collecting-conveying process, an outer rotor oil collecting-conveying process and an inner ring oil collecting-conveying process according to structures of the wall surface formed at different positions in the total flow path in a sequential relationship.
4. A method for simulation analysis of oil recovery process of intermediate bearing lubricating oil according to claim 3, wherein: the inner rotor oil collecting-conveying process is a flowing process of lubricating oil from a nozzle to an oil collecting groove between the inner rotor and the outer rotor, and the wall surface of the section of flow path is formed by the inner rotor and the oil collecting ring;
the outer rotor oil collecting and conveying process is a flowing process of lubricating oil from an oil collecting groove between the inner rotor and the outer rotor to an annular cavity between the outer rotor and an inner ring of the bearing, and the wall surface of the section of flow path is formed by the inner rotor and the outer rotor;
the process of collecting and delivering oil from the inner ring of the bearing is a flowing process of lubricating oil from an annular cavity between the outer rotor and the inner ring of the bearing to the rolling bodies of the bearing, and the wall surface of the section of flow path is formed by the outer rotor and the inner ring of the bearing.
5. A method for simulating analysis of an oil recovery process of an intermediate bearing oil according to claim 3, wherein in step 3, the method comprises:
step 3.1, respectively establishing three-dimensional solid models corresponding to the three sections of flow paths through software according to the specific shapes and the relative position relations of the bearing inner ring, the bearing outer ring, the inner rotor, the outer rotor and the oil collecting ring analyzed in the step 1.1;
step 3.2, differentiating the three-dimensional solid model by Boolean operation to obtain three corresponding fluid domain models;
and 3.3, applying corresponding boundary conditions according to the composition of the wall surface of each section of the flow path in the step 2, and respectively performing lubricating oil flow simulation calculation on each fluid domain model.
6. A method for simulating analysis of an oil recovery process of an intermediate bearing lubricating oil according to claim 3, wherein in step 4, the method comprises:
step 4.1, calculating to obtain the outflow of the lubricating oil in the oil collecting and conveying process of the inner rotor according to the input quantity of the lubricating oil given in the design as the input quantity of the lubricating oil in the oil collecting and conveying process of the inner rotor;
step 4.2, calculating to obtain the outflow of the lubricating oil in the outer rotor oil collecting-conveying process according to the outflow of the lubricating oil in the inner rotor oil collecting-conveying process, wherein the outflow is used as the input of the lubricating oil in the outer rotor oil collecting-conveying process;
and 4.3, calculating to obtain the outflow of the lubricating oil in the oil collecting and transporting process of the inner ring of the bearing according to the outflow of the lubricating oil in the oil collecting and transporting process of the outer rotor, wherein the outflow is the amount of the lubricating oil entering the inner ring of the bearing after being sprayed out from the nozzle.
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