CN116663200B - Method and device for screening blades of integral impeller of compressor with controllable frequency dispersion - Google Patents
Method and device for screening blades of integral impeller of compressor with controllable frequency dispersion Download PDFInfo
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Abstract
The invention relates to the technical field of aeroengines, and discloses a method and a device for screening compressor blisk blades with controllable frequency dispersion, wherein the minimum value of blade profile parameters is obtained by taking the ratio of second-order bending frequency to first-order bending frequency corresponding to a lower difference model of the compressor blisk blades as the minimum value of the blade profile parameters, and analyzing the control deviation of the blade profile parameters according to the minimum value of the blade profile parameters and the frequency dispersion of the compressor blisk blades; and then, obtaining the actual first-order bending frequency and the second-order bending frequency of each blade to be tested through a test, and selecting the blade of which the actual blade profile parameter is in the range of the minimum value and the maximum value of the blade profile parameter corresponding to the blade to be tested as the blade meeting the requirement of frequency dispersibility. The invention takes the blade profile parameters as the entry points, can effectively control the frequency dispersion degree among different batches of blade discs of the compressor, and supports the vibration design of the blades of the blisk of the compressor.
Description
Technical Field
The invention relates to the technical field of aeroengines, and discloses a method and a device for screening blades of a blisk of a compressor with controllable frequency dispersion.
Background
The failure mode of the integral impeller blade of the aeroengine compressor is mainly vibration failure of the blade, and the vibration mode of the blade is mainly divided into integral-order vibration and non-integral-order vibration, wherein the integral-order vibration of the integral impeller blade is restrained mainly through frequency modulation. Due to the dispersibility of materials and the dispersibility of manufacturing dimensions, certain dispersibility of the blisk blade frequency can occur, and the larger the blade frequency dispersibility is, the larger the resonance rotating speed interval is, so that the vibration design is not facilitated. By controlling the frequency dispersion of the blade, the resonance rotating speed of the blade can be controlled in a narrower rotating speed interval, thereby effectively controlling the resonance of the blade. Thus, there is an engineering objective need to control the frequency dispersion of blisk blades.
Due to the dimensional and material dispersion of blisk processing, the frequency of blisk blades varies somewhat from the desired frequency. Taking material dispersion as an example, the elastic modulus is about 4%, the absolute frequency is about 2%, the wall thickness is about 5% and the absolute frequency is about 5% as an example, and making a control method related to the absolute value of frequency has no practical meaning.
Currently, the domestic engine industry controls blisk blade frequency dispersion, which is critical to control individual blisk frequency dispersion less than a certain fixed value, such as individual blisk blade frequency dispersion no more than 3%. The control method has the advantages that: the frequency dispersion degree of a certain leaf disc blade can be controlled; the defects are that: the blade frequency dispersion between the plurality of blades cannot be controlled. For example: disk a and disk b are compressor first-stage impeller disks (different batches), the disk a has a blade frequency of 1500-1540 Hz, the frequency dispersion is 2.63%, the disk b has a blade frequency of 1460-1500 Hz, the frequency dispersion is 2.70%, and both disk a and disk b meet 3% control requirements, but the disk a and disk b are integrated, the blade frequency dispersion is 1460-1540 Hz, the frequency dispersion is 5.33%, and 5.33% is greater than 3%, and the blade frequency dispersion among different impeller disks cannot be effectively controlled.
Disclosure of Invention
The invention aims to provide a method and a device for screening blades of a blisk of a gas compressor with controllable frequency dispersion, which can effectively control the frequency dispersion degree among the blisks of different batches of gas compressors and support the vibration design of the blades of the blisk of the gas compressor.
In order to achieve the technical effects, the technical scheme adopted by the invention is as follows:
the method for screening the blades of the blisk of the compressor with controllable frequency dispersion comprises the following steps:
obtaining a minimum value of blade profile parameters of blades of the integral blade disc of the air compressor according to a blade design model of the integral blade disc of the air compressor, wherein the blade profile parameters are ratios of second-order bending frequencies and first-order bending frequencies of the blades;
calculating the maximum value of the blade profile parameters according to the minimum value of the blade profile parameters and the control deviation of the frequency dispersion degree of the blades of the blisk of the compressor;
respectively obtaining a first-order bending frequency actual value and a second-order bending frequency actual value of all blades of the integral blade disc of the air compressor;
calculating according to the first-order bending frequency actual value and the second-order bending frequency actual value of each blade to obtain actual blade profile parameters of the corresponding blade;
and selecting the blisk blade with the actual blade profile parameter in the range of the minimum value and the maximum value of the blade profile parameter as the blisk blade meeting the frequency dispersibility requirement.
Further, obtaining a minimum value of blade profile parameters of the compressor blisk blade according to a blade design model of the compressor blisk, including:
obtaining a first-order bending frequency minimum value and a second-order bending frequency minimum value of a lower difference model in a blade design model of a compressor blisk through finite element modal analysis, and then obtaining the lower difference model according to the formulaObtaining leaf profile parameter minimum +.>Wherein->First order bending frequency minimum value for lower difference model,/->Is the second order bending frequency minimum of the lower difference model.
Further according toCalculating leaf profile parameter maximum +.>Wherein->Is the minimum value of leaf profile parameters +.>The deviation is controlled for the frequency dispersion degree of the blades of the blisk of the air compressor.
In order to achieve the technical effects, the invention provides a compressor blisk blade screening device with controllable frequency dispersion, which comprises:
a first leaf profile parameter analysis module: the method comprises the steps of obtaining a minimum blade profile parameter of a blade of the compressor blisk according to a blade design model of the compressor blisk, wherein the blade profile parameter is a ratio of a second-order bending frequency to a first-order bending frequency of the blade;
the second leaf profile parameter analysis module: the method comprises the steps of calculating a blade profile parameter maximum value according to a blade profile parameter minimum value and a frequency dispersion control deviation of a compressor blisk blade;
the data acquisition module is used for respectively acquiring the actual values of the first-order bending frequency and the actual values of the second-order bending frequency of all blades of the integral blade disc of the compressor;
and a third leaf type parameter analysis module: the blade profile parameter calculation method comprises the steps of calculating and obtaining actual blade profile parameters of corresponding blades according to a first-order bending frequency actual value and a second-order bending frequency actual value of each blade;
and the screening module is used for selecting blisk blades with actual blade profile parameters within the range of the minimum value of the blade profile parameters and the maximum value of the blade profile parameters as blisk blades meeting the frequency dispersibility requirement.
Further, the first blade profile parameter analysis module obtains a lower difference model in the blade design model of the integral blade disc of the compressor through finite element modal analysisThe first order bending frequency minimum and the second order bending frequency minimum are then calculated according toObtaining leaf profile parameter minimum +.>Wherein->First order bending frequency minimum value for lower difference model,/->Is the second order bending frequency minimum of the lower difference model.
Further, the second leaf profile parameter analysis module is used for analyzing the leaf profile parameters according to the following stepsCalculating the maximum value of the leaf profile parametersWherein->Is the minimum value of leaf profile parameters +.>The deviation is controlled for the frequency dispersion degree of the blades of the blisk of the air compressor.
Compared with the prior art, the invention has the following beneficial effects: the invention takes the blade profile parameters as the entry points, can effectively control the frequency dispersion degree among different batches of blade discs of the compressor, and can support the vibration design of the blades of the integral blade disc of the compressor.
Drawings
FIG. 1 is a flow chart of a method for screening blisk blades of a compressor with controllable frequency dispersion in examples 1 and 2;
FIG. 2 is a block diagram showing a compressor blisk blade screening apparatus with controllable frequency dispersion in example 1;
FIG. 3 is a first order bending frequency dispersion plot of a compressor blisk blade in example 2;
FIG. 4 is a graph of the second order bending frequency dispersion of a compressor blisk blade in example 2;
FIG. 5 is a graph of the dispersion of profile parameters of a compressor blisk blade in example 2;
FIG. 6 is a plot of the first order bending frequency dispersion of the blisk blades of the compressor after screening in example 2;
FIG. 7 is a graph showing the second order bending frequency dispersion of the blisk blades of the compressor after screening in example 2;
the method comprises the steps of 1, a first leaf type parameter analysis module; 2. a second leaf profile parameter analysis module; 3. a data acquisition module; 4. a third leaf type parameter analysis module; 5. and a screening module.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
Referring to fig. 1 and 2, the method for screening blades of a blisk of a compressor with controllable frequency dispersion comprises the following steps:
obtaining a minimum value of blade profile parameters of blades of the integral blade disc of the air compressor according to a blade design model of the integral blade disc of the air compressor, wherein the blade profile parameters are ratios of second-order bending frequencies and first-order bending frequencies of the blades;
calculating the maximum value of the blade profile parameters according to the minimum value of the blade profile parameters and the control deviation of the frequency dispersion degree of the blades of the blisk of the compressor;
respectively obtaining a first-order bending frequency actual value and a second-order bending frequency actual value of all blades of the integral blade disc of the air compressor;
calculating according to the first-order bending frequency actual value and the second-order bending frequency actual value of each blade to obtain actual blade profile parameters of the corresponding blade;
and selecting the blisk blade with the actual blade profile parameter in the range of the minimum value and the maximum value of the blade profile parameter as the blisk blade meeting the frequency dispersibility requirement.
In the embodiment, the ratio of the second-order bending frequency to the first-order bending frequency of the blade corresponding to the lower difference model of the blades of the integral impeller of the air compressor is used as the minimum value of the blade profile parameters, and the maximum value of the blade profile parameters is obtained according to the minimum value of the blade profile parameters and the frequency dispersion control deviation analysis of the blades of the integral impeller of the air compressor; and then, obtaining the actual first-order bending frequency and the second-order bending frequency of each blade to be tested through a test, and selecting the blade of which the actual blade profile parameter is in the range of the minimum value and the maximum value of the blade profile parameter corresponding to the blade to be tested as the blade meeting the requirement of frequency dispersibility. The invention takes the blade profile parameters as the entry points, realizes the frequency dispersion control of different blade discs and can support the vibration design of the integral blade disc blade of the compressor.
Based on the same inventive concept, the embodiment provides a compressor blisk blade screening device with controllable frequency dispersion, which comprises:
the first leaf profile parameter analysis module 1: obtaining minimum blade profile parameter values of blades of the compressor blisk according to a blade design model of the compressor bliskThe blade profile parameter is the ratio of the second-order bending frequency to the first-order bending frequency of the blade; in this embodiment, the first blade profile parameter analysis module 1 obtains a first-order bending frequency minimum value and a second-order bending frequency minimum value of a lower difference model according to a lower difference model in a blade design model of a compressor blisk through finite element modal analysis, and then according to the formula->Obtaining leaf profile parameter minimum +.>Wherein->First order bending frequency minimum value for lower difference model,/->Is the second order bending frequency minimum of the lower difference model.
The second leaf profile parameter analysis module 2: for minimum values according to leaf profile parametersAnd the frequency dispersion control deviation of the compressor blisk blades, calculating the maximum value of the blade profile parameters +.>The method comprises the steps of carrying out a first treatment on the surface of the The second leaf profile parameter analysis module 2 in this embodiment is based on +.>Calculating a leaf profile parameter maximum, wherein +_>Is the minimum value of leaf profile parameters +.>The deviation is controlled for the frequency dispersion degree of the blades of the blisk of the air compressor.
The data acquisition module 3 is used for respectively acquiring the actual values of the first-order bending frequency and the actual values of the second-order bending frequency of all blades of the integral blade disc of the compressor;
third leaf type parameter analysis module 4: the blade profile parameter calculation method comprises the steps of calculating and obtaining actual blade profile parameters of corresponding blades according to a first-order bending frequency actual value and a second-order bending frequency actual value of each blade;
and the screening module 5 is used for selecting the blisk blades with the actual blade profile parameters within the range of the minimum value of the blade profile parameters and the maximum value of the blade profile parameters as the blisk blades meeting the frequency dispersion requirement.
Example 2
Referring to fig. 1, the method of the present invention will be described in detail by taking the selection of blisk blades of a compressor, which has 16 blisks and 63 blades per blisk, and the specific screening process is as follows:
step one, according to the compressed airThe blade design model of the integral blade disc of the compressor obtains the minimum value of blade profile parameters of the integral blade disc blade of the compressorThe blade profile parameter is the ratio of the second-order bending frequency to the first-order bending frequency of the blade;
the selected leaf profile parameters are the ratio of the second-order bending frequency to the first-order bending frequency, because the ratio eliminates the influence of the material parameters, namely, even if the material parameters are completely different under the same leaf profile, the deviation of the leaf profile parameters is very small, so that the engineering requirements are satisfied. In this embodiment, according to a lower difference model in a blade design model of a compressor blisk, a first-order bending frequency minimum value and a second-order bending frequency minimum value of the lower difference model are obtained through finite element modal analysis, and then according to the formulaObtaining leaf profile parameter minimum +.>. The finite element calculation result of the lower difference model is as follows。
Step two, according to the minimum value of the blade profile parametersAnd the frequency dispersion control deviation of the compressor blisk blades, calculating the maximum value of the blade profile parameters +.>；
In the present embodiment, the method can be based onCalculating a leaf profile parameter maximum, wherein +_>Is the minimum value of leaf profile parameters +.>The deviation is controlled for the frequency dispersion degree of the blades of the blisk of the air compressor. In this embodiment, the design requirement of the air compressor suggests that the frequency dispersion control value is not more than 3%, so that the frequency dispersion control value is +.>Obtaining leaf type parameter maximum ∈ ->3.313. Therefore, the design interval of the vane profile parameters of the compressor blisk vane is [3.215,3.313]]。
Step three, respectively obtaining a first-order bending frequency actual value and a second-order bending frequency actual value of all blades of the integral blade disc of the compressor;
in this embodiment, the frequency measurement method of the blade may be recommended to be a hammering method, where the blisk is different from a single blade, and frequency measurement errors caused by different clamping modes do not exist, so that measurement accuracy requirements can be met by hammering measurement.
Step four, calculating according to the first-order bending frequency actual value and the second-order bending frequency actual value of each blade to obtain the actual blade profile parameters of the corresponding blade;
in this embodiment, each blade of the integral blade disc of the air compressor needs to measure the actual first-order bending frequency and the actual second-order bending frequency, so as to obtain the measured blade profile parameters of each blade，/>The blades are numbered.
In the implementation, after the frequency is obtained by the hammering method, the frequency dispersion diagram is drawn as shown in fig. 3 and 4, and as can be seen from fig. 3 and 4, the frequency dispersion degree of 16 bladed discs meets the control requirement of the traditional method on the frequency dispersion degree of single bladed disc blades, and the actual first-order bending frequency and the actual second-order bending frequency dispersion degree of the single bladed disc are both lower than 3%. However, the first bending frequency dispersity of the blade disk is 3.6%, the second bending frequency dispersity of the blade disk is 5.3%, and the dispersity of the blade disk is larger. As shown in FIG. 5, it can be seen from FIG. 5 that the leaf disks 1, 2, 5, 6, 7, 10, 12, 14 exceed the leaf design interval and do not meet the control requirements of the present invention.
Fifthly, selecting a blade with actual blade profile parameters within a range of [3.215,3.313] as a blisk blade meeting the frequency dispersibility requirement;
the frequency dispersion of the blade disk selected by the method of the embodiment is shown in fig. 6 and 7, the actual first-order bending frequency dispersion degree in fig. 6 is 2.7%, the actual second-order bending frequency dispersion degree in fig. 7 is 3.6%, and the frequency dispersion degree limiting index is not a trafficability index, but a recommended index, and is slightly higher than the recommended value, so that the frequency dispersion degree limiting index is an acceptable range. Therefore, the method of the embodiment can control the frequency dispersion degree to be about 3%, the frequency dispersion degree of the blades of the impeller is obviously reduced, and the frequency dispersion degree among different batches of impeller of the compressor can be effectively controlled.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The method for screening the blades of the blisk of the compressor with controllable frequency dispersion is characterized by comprising the following steps of:
obtaining a minimum value of blade profile parameters of blades of the integral blade disc of the air compressor according to a blade design model of the integral blade disc of the air compressor, wherein the blade profile parameters are ratios of second-order bending frequencies and first-order bending frequencies of the blades;
calculating the maximum value of the blade profile parameters according to the minimum value of the blade profile parameters and the control deviation of the frequency dispersion degree of the blades of the blisk of the compressor;
respectively obtaining a first-order bending frequency actual value and a second-order bending frequency actual value of all blades of the integral blade disc of the air compressor;
calculating according to the first-order bending frequency actual value and the second-order bending frequency actual value of each blade to obtain actual blade profile parameters of the corresponding blade;
and selecting the blisk blade with the actual blade profile parameter in the range of the minimum value and the maximum value of the blade profile parameter as the blisk blade meeting the frequency dispersibility requirement.
2. The method for screening blades of a blisk of a compressor with controllable frequency dispersion of claim 1, wherein obtaining a minimum value of a blade profile parameter of the blades of the blisk of the compressor according to a blade design model of the blisk of the compressor comprises:
obtaining a first-order bending frequency minimum value and a second-order bending frequency minimum value of a lower difference model in a blade design model of a compressor blisk through finite element modal analysis, and then obtaining the lower difference model according to the formulaObtaining leaf profile parameter minimum +.>Wherein->First order bending frequency minimum value for lower difference model,/->Is the second order bending frequency minimum of the lower difference model.
3. The method for screening blisk blades for a compressor with controllable frequency dispersion of claim 1, wherein, according to the methodCalculating leaf profile parameter maximum +.>Wherein->Is the minimum value of leaf profile parameters +.>The deviation is controlled for the frequency dispersion degree of the blades of the blisk of the air compressor.
4. Frequency dispersion controllable compressor blisk blade sieving mechanism, its characterized in that includes:
a first leaf profile parameter analysis module: the method comprises the steps of obtaining a minimum blade profile parameter of a blade of the compressor blisk according to a blade design model of the compressor blisk, wherein the blade profile parameter is a ratio of a second-order bending frequency to a first-order bending frequency of the blade;
the second leaf profile parameter analysis module: the method comprises the steps of calculating a blade profile parameter maximum value according to a blade profile parameter minimum value and a frequency dispersion control deviation of a compressor blisk blade;
the data acquisition module is used for respectively acquiring the actual values of the first-order bending frequency and the actual values of the second-order bending frequency of all blades of the integral blade disc of the compressor;
and a third leaf type parameter analysis module: the blade profile parameter calculation method comprises the steps of calculating and obtaining actual blade profile parameters of corresponding blades according to a first-order bending frequency actual value and a second-order bending frequency actual value of each blade;
and the screening module is used for selecting blisk blades with actual blade profile parameters within the range of the minimum value of the blade profile parameters and the maximum value of the blade profile parameters as blisk blades meeting the frequency dispersibility requirement.
5. The device for screening blades of a blisk of a compressor with controllable frequency dispersion as recited in claim 4, wherein said first profile parameter analysis module obtains a first-order bending frequency minimum and a second-order bending frequency minimum of a lower-order model according to a lower-order model in a blade design model of the blisk of the compressor by finite element modal analysis, and then according to the formulaObtaining leaf profile parameter minimum +.>Wherein->First order bending frequency minimum value for lower difference model,/->Is the second order bending frequency minimum of the lower difference model.
6. The device for screening blisk blades for a compressor with controllable frequency dispersion as recited in claim 4, wherein said second profile parameter analysis module is configured toCalculating leaf profile parameter maximum +.>Wherein->Is the minimum value of leaf profile parameters +.>The deviation is controlled for the frequency dispersion degree of the blades of the blisk of the air compressor.
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