CN-122021094-A - Nickel-based single crystal turbine blade orientation angle optimization method and computing device

CN122021094ACN 122021094 ACN122021094 ACN 122021094ACN-122021094-A

Abstract

An optimization method of an orientation angle of a nickel-based single crystal turbine blade comprises the steps of providing an initial finite element model of the single crystal turbine blade, taking Euler angles of the single crystal turbine blade as variables, establishing a simulation analysis matrix, calculating natural frequencies of the single crystal turbine blade with different Euler angles to obtain a sample set, performing machine learning training according to the sample set to obtain a mapping relation between the Euler angles and stress and the natural frequencies, establishing a blade failure probability assessment model according to the mapping relation, substituting a blade manufacturing tolerance into the failure probability assessment model, and calculating an orientation angle with the lowest failure probability of the blade. The method can optimize the crystal orientation of the single crystal turbine blade, and improve the service life and reliability of the blade. The invention also provides a computing device.

Inventors

YUAN HUI
CAI PEI
ZHANG JIACHENG
ZHANG YISHANG
SUN KAI

Assignees

中国航发商用航空发动机有限责任公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. The method for optimizing the orientation angle of the nickel-based single crystal turbine blade is characterized by comprising the following steps of: Step a), providing an initial finite element model of the single crystal turbine blade; Step b), taking Euler angles of the single crystal turbine blades as variables, establishing a simulation analysis matrix, and calculating by using the simulation analysis matrix to obtain stress and natural frequency of the single crystal turbine blades under a plurality of different Euler angles to obtain a sample set; Step c), performing machine learning training by using the sample set, and establishing a mapping relation between the Euler angle of the single crystal turbine blade and the bit stress and the natural frequency of the single crystal turbine blade; Step d), establishing failure probability evaluation models of the single crystal turbine blades corresponding to Euler angles of different single crystal turbine blades according to the mapping relation; Substituting the manufacturing tolerance of the single crystal turbine blade into the failure probability evaluation model, calculating the Euler angle of the single crystal turbine blade with the lowest failure probability under the manufacturing tolerance, and calculating the corresponding orientation angle of the single crystal turbine blade according to the Euler angle.
2. The method of optimizing the orientation angle of a nickel-based single crystal turbine blade according to claim 1, wherein in said step a), said initial finite element model includes film holes and internal cooling channels, and the edges of said film holes and corner regions of said internal cooling channels have a higher meshing density.
3. The method of optimizing the orientation angle of a nickel-based single crystal turbine blade according to claim 1, wherein in said step b), the values of said plurality of different euler angles are determined by an orthogonal method or a latin hypercube method.
4. A method of optimizing the orientation angle of a nickel-base single crystal turbine blade according to claim 1 or 3, wherein the range of precession angle is 0 ° -360 °, the range of self-rotation angle is 0 ° -90 °, and the range of nutation angle is 0 ° -15 °.
5. The method of optimizing the orientation angle of a nickel-base single crystal turbine blade according to claim 1, wherein said stresses in step a), step b) and step c) include stress data for a plurality of given stress concentration locations.
6. The method for optimizing the orientation angle of a nickel-based single crystal turbine blade according to claim 1, wherein in the step c), machine learning training is performed using 80% of the sample set as a training set and 20% as a test set.
7. The method for optimizing an orientation angle of a nickel-based single crystal turbine blade according to claim 1 or 6, wherein the machine learning is configured as a machine learning method using a neural network, wherein 1 to 2 hidden layers are provided with euler angles of the single crystal turbine blade as input layers and the stress and the natural frequency as output layers, and wherein 10 to 20 neurons are provided per layer.
8. The method for optimizing the orientation angle of a nickel-based single crystal turbine blade according to claim 1, wherein in the step d), the failure probability evaluation method is to calculate the failure probability of the single crystal turbine blade in a static strength failure mode, a low cycle fatigue failure mode, a creep failure mode and a high cycle fatigue mode, respectively, and calculate the joint failure probability of the single crystal turbine blade.
9. The method for optimizing the orientation angle of a nickel-based single crystal turbine blade according to claim 1, wherein in the step e), the manufacturing tolerance is substituted into the failure probability evaluation model by determining the orientation angle tolerance of the single crystal turbine blade according to a machining process, and converting the orientation angle into the Euler angle of the corresponding single crystal turbine blade.
10. A computing device comprising a memory and a processor, wherein the memory stores a computing program that, when executed by the processor, is capable of performing the method of optimizing the orientation angle of a nickel-base single crystal turbine blade as claimed in any one of claims 1 to 9.

Description

Nickel-based single crystal turbine blade orientation angle optimization method and computing device Technical Field The invention belongs to the field of aero-engines, and particularly relates to a method for optimizing an orientation angle of a nickel-based single crystal turbine blade and a computing device. Background The nickel-based single crystal alloy material is widely applied to the manufacture of turbine blades of aeroengines due to the excellent mechanical properties of the nickel-based single crystal alloy material in a high-temperature environment. However, nickel-based single crystal alloys are typical anisotropic materials, and have significant differences in elastic modulus, strength, fatigue life, etc. in various directions, and thus have significant differences in life, vibration characteristics, etc. of single crystal turbine blades of different orientation angles. Engineering experience shows that single crystal turbine blades with primary orientation angles no greater than 15 ° may have natural frequencies that differ by more than 10% and lifetimes that differ by 1-2 orders of magnitude or even higher. Because of the extremely high reliability requirements of the aero-engine on its components, when the single crystal turbine blades have a large dispersion of life, the life can only be determined according to the shorter life thereof, which obviously results in great waste for those blades with longer life. The optimal design of the orientation angle of the single crystal turbine blade can obviously reduce the service life of the blade and the dispersity of vibration characteristics, thereby greatly improving the service life and the reliability level of the turbine blade of the aeroengine, and having important engineering value and economic benefit. Currently, the requirement for the orientation angle of the single crystal turbine blade still maintains the early regulation of the national aviation and aerospace agency (NASA), namely that the primary orientation angle is not more than 15 degrees, other orientation angles are not required, and no engineering feasible single crystal turbine blade orientation angle optimization design method exists. Therefore, there is a need for a method for optimizing the design of the orientation angle of a single crystal turbine blade, which provides theoretical support for optimizing the design and manufacture of the single crystal turbine blade. Disclosure of Invention The invention aims to provide an optimization method of an orientation angle of a nickel-based single crystal turbine blade, which improves the reliability of the nickel-based single crystal turbine blade. The invention also provides a computing device. According to an embodiment of one aspect of the present invention, there is provided a method for optimizing an orientation angle of a nickel-based single crystal turbine blade, the method comprising the steps of: Step a), providing an initial finite element model of the single crystal turbine blade; Step b), taking Euler angles of the single crystal turbine blades as variables, establishing a simulation analysis matrix, and calculating to obtain the bit stress and the natural frequency of the single crystal turbine blades under a plurality of different Euler angles by using the simulation analysis matrix to obtain a sample set; Step c), performing machine learning training by using the sample set, and establishing a mapping relation between the Euler angle of the single crystal turbine blade and the bit stress and the natural frequency of the single crystal turbine blade; Step d), establishing failure probability evaluation models of the single crystal turbine blades corresponding to Euler angles of different single crystal turbine blades according to the mapping relation; Substituting the manufacturing tolerance of the single crystal turbine blade into the failure probability evaluation model, calculating the Euler angle of the single crystal turbine blade with the lowest failure probability under the manufacturing tolerance, and calculating the corresponding orientation angle of the single crystal turbine blade according to the Euler angle. According to the method, the optimal orientation angle of the nickel-based single crystal turbine blade with the tolerance can be provided through quantitative calculation of failure risk, so that clear orientation angle requirements are provided for the production and manufacture of the nickel-based single crystal blade, the service life and reliability of the blade are improved, and the economic benefit is improved. Further, in some embodiments, in the step a), the initial finite element model includes a film hole and an inner cooling channel, and edges of the film hole and corner regions of the inner cooling channel have a higher meshing density. Further, in some embodiments, in the step b), the values of the plurality of different euler angles are determined by an orthogonal method or a latin