CN115600469B - Compressor wheel disc center Kong Chijiu damage assessment method based on stress reserve - Google Patents

Compressor wheel disc center Kong Chijiu damage assessment method based on stress reserve Download PDF

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CN115600469B
CN115600469B CN202211462751.6A CN202211462751A CN115600469B CN 115600469 B CN115600469 B CN 115600469B CN 202211462751 A CN202211462751 A CN 202211462751A CN 115600469 B CN115600469 B CN 115600469B
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wheel disc
stress
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CN115600469A (en
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程荣辉
庞燕龙
张少平
孙海鹤
曾瑶
陈妍妍
张蜃之
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AECC Sichuan Gas Turbine Research Institute
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Abstract

The invention relates to the technical field of aeroengines, and discloses a method for evaluating damage to a center Kong Chijiu of a compressor wheel disc based on stress reserve, which comprises the steps of calculating average temperatures of center holes of the compressor wheel disc under different working conditions, judging whether the yield strength or tensile strength of a material corresponding to the average temperatures of the center holes under each working condition is reduced by more than a preset threshold value compared with the yield strength or tensile strength of the material in a room temperature state, and judging whether the yield strength or tensile strength of the material exceeds the preset threshold valuenAccording to the working conditionsnCalculating the equivalent permanent storage of the center hole of the compressor wheel disc by the permanent strength storage of the center hole of the individual wheel disc and the power exponent of the permanent stress-life curve under the working condition of the highest temperature; if the equivalent permanent reserve is larger than the permanent strength reserve standard value, the permanent strength stress reserve of the central hole of the compressor, which indicates that the stress reserve of the central hole can meet the permanent strength stress reserve of the central hole of the compressor, can ensure that the permanent damage of the central hole of the wheel disc, which works in the high temperature environment, is in a controllable range, and can ensure the safety and reliability of the central hole of the wheel disc and the safety in use of the wheel disc at high temperature.

Description

Compressor wheel disc center Kong Chijiu damage assessment method based on stress reserve
Technical Field
The invention relates to the technical field of aero-engines, in particular to a method for evaluating damage to a compressor wheel disc center Kong Chijiu based on stress reserve.
Background
The wheel disc is the most typical key part of an aeroengine (note: the key part refers to a part of which failure can cause dangerous engine influence), and mainly consists of a wheel rim, a wheel disc and a wheel hub, wherein a central hole of the wheel disc is one of the key parts of the design of the wheel disc.
In order to ensure the use safety of the aircraft engine wheel disc, foreign and well-known aircraft engine companies often adopt a stress reserve strength design method to limit the stress level on the wheel disc. This method is generally based on nominal stress (i.e., average stress), such as that established by the company Roels Luo Yisi, UK, 20 th century 60 (R.R. for short) for SPEY MK202 engines. Because the stress reserve method is convenient, simple and effective to use, the strength design of the part of the internal engine wheel disc also refers to the overseas stress reserve standard, for example, the typical stress standard of the compressor wheel disc in aviation engine design manual published in 2001 refers to the EGD-3 stress standard, and the specific situation is shown in table 1.
Table 1 comparison of typical stress reserve criteria for compressor disks
Figure 491685DEST_PATH_IMAGE001
With the continuous increase of the thrust-weight ratio of the aero-engine, the temperature load borne by the engine wheel disc is continuously increased, such as an F110 engine of the American GE company, and a structural mode of air bleed of the compressor wheel disc center is adopted, and the air bleed mode can cause the temperature of the center hole of the compressor wheel disc near the air bleed flow path to be equivalent to or even exceed the temperature of the wheel rim.
The problem of creep deformation and the problem of permanent stress fracture of the wheel disc are increasingly focused by designers when the wheel disc is operated at high temperatures for a long time. Therefore, the disk stress criteria in the "design criteria for structural strength of aircraft gas turbine engines" published 2018 increased the content of creep strength reserves and endurance strength reserves on the basis of table 1 (see table 2), and analysis found that table 2 did not give endurance strength reserve requirements for the disk center hole.
Table 2 typical stress Standard of roulette (military engine)
Figure 321100DEST_PATH_IMAGE002
The material performance of the center hole is seriously reduced when the center hole works at high temperature, creep/lasting and low-cycle fatigue load are born, and if creep/lasting effect is not considered, only the yield strength reserve evaluation of the center hole is carried out according to the table 1, so that the use safety of the wheel disc can not be ensured when the wheel disc works at high temperature.
The compressor central hole works at high temperature, and not only the low cycle fatigue life damage of the central hole, but also the lasting life damage of the central hole are required to be considered. The permanent life is defined as the time during which the component does not experience permanent failure (or stress cracking) under given operating temperature and stress conditions.
Permanent stress-life curve equation of material at the working temperature of a wheel disc is required in structural strength design criterion of aviation gas turbine engine published in 2018
Figure 177061DEST_PATH_IMAGE003
) Power exponent of the slope of a curvemWhen the strength is less than or equal to 7, the permanent strength storage and the permanent life assessment are carried out,mthe calculation formula of (2) is as follows:
Figure 15704DEST_PATH_IMAGE004
wherein%t 1 ，σ 1 ）、（t 2 ，σ 2 ) Coordinates of any two points on the material endurance stress-life curve.
But engineering discovers that all the power indexes representing the slope of the curve at the working temperature of the central hole of the compressor wheel discm>7, the condition for evaluating the lifetime is not satisfied.
Disclosure of Invention
In view of the above, the invention provides a method for evaluating damage of a compressor wheel disc center Kong Chijiu based on stress reserve, which can ensure safety and reliability of the wheel disc center hole and safety in use at high temperature of the wheel disc by limiting the permanent strength stress reserve of the compressor center hole working in a high temperature environment so that the permanent damage of the wheel disc center hole working in the high temperature environment is within a controllable range.
The method for evaluating the damage of the center Kong Chijiu of the compressor wheel disc based on stress reserve comprises the following steps:
step 1, calculating average temperatures of center holes of a wheel disc of the compressor under different working conditions;
step 2, judging whether the yield strength or tensile strength of the material corresponding to the average temperature of the center hole of the wheel disc under different working conditions is reduced by more than a preset threshold value compared with the yield strength or tensile strength of the material in the room temperature state;
step 3, aiming at the decrease in step 2 exceeding the preset threshold valuenCalculating the permanent strength reserve of the center hole of the wheel disc of the compressor under each working condition
Figure 125874DEST_PATH_IMAGE005
Wherein, the method comprises the steps of, wherein,
Figure 657349DEST_PATH_IMAGE006
to at the firstjThe average circumferential stress of the central hole of the working condition,
Figure 735026DEST_PATH_IMAGE007
to at the firstjMaximum constant stress of the components in working time and temperature conditions corresponding to working conditions;
step 4, calculating equivalent persistent reserve
Figure 377360DEST_PATH_IMAGE008
Wherein:
Figure 856883DEST_PATH_IMAGE009
at the highest temperature
Figure 542948DEST_PATH_IMAGE010
A power exponent of the permanent stress-life curve under operating conditions;nthe calculated working condition number; the equivalent persistent reserve should be satisfied
Figure 373501DEST_PATH_IMAGE011
And (5) determining that the permanent strength reserve of the central hole of the air compressor meets the requirement when the permanent strength reserve is larger than or equal to the standard value of the permanent strength reserve.
Further, the preset threshold value in the step 1 is 10%.
Further, in step 1, the average temperature of the center hole is obtained by using the calculation result of the finite element and using the path integration.
Further, the average circumferential stress of the central hole in the step 3 is calculated by adopting finite elements, and the average circumferential stress of the central hole is obtained according to path integration.
Further, the standard value of the permanent strength reserve in the step 4 is 1.3.
Compared with the prior art, the invention has the beneficial effects that: the invention can ensure the safety and reliability of the central hole of the wheel disc and the use safety of the wheel disc at high temperature by limiting the permanent strength stress reserve of the central hole of the air compressor working in the high temperature environment so that the permanent damage of the central hole of the wheel disc working in the high temperature environment is in a controllable range.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for evaluating damage to a compressor disk center Kong Chijiu based on stress reserve in example 1 or 2.
Detailed Description
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Example 1
Referring to fig. 1, a method for evaluating damage to a compressor disk center Kong Chijiu based on stress reserve includes the steps of:
step 1, calculating average temperatures of center holes of a wheel disc of the compressor under different working conditions;
step 2, judging whether the yield strength or tensile strength of the material corresponding to the average temperature of the center hole of the wheel disc under different working conditions is reduced by more than a preset threshold value compared with the yield strength or tensile strength of the material in the room temperature state;
step 3, aiming at the decrease in step 2 exceeding the preset threshold valuenCalculating the permanent strength reserve of the center hole of the wheel disc of the compressor under the working condition, wherein the permanent strength reserve is calculated in the first working conditionjThe average circumferential stress of the central hole under the working condition is thatjMaximum constant stress of the components in working time and temperature conditions corresponding to working conditions;
step 4, calculating equivalent persistent reserve
Wherein: a power exponent of the permanent stress-life curve at the highest temperature operating condition;nthe calculated working condition number; the equivalent permanent storage is more than or equal to the standard value of the permanent strength storage, and the permanent strength storage of the central hole of the compressor is determined to meet the requirement.
In this embodiment, by calculating the average temperatures of the center holes of the compressor wheel disc under different working conditions, and determining whether the yield strength or tensile strength of the material corresponding to the average temperature of the center holes under each working condition is reduced by more than a preset threshold value compared with the yield strength or tensile strength of the material in the room temperature state, the average temperature of the center holes under each working condition is reduced by more than the preset threshold valuenRespectively calculating the permanent strength reserve of the central hole of the wheel disc according to the working conditionsnDurable strength reserve of central hole of individual wheel disc and power of durable stress-life curve m under highest temperature working condition 1 Calculating the equivalent durable reserve of the center hole of the compressor wheel disc; if the equivalent weight is long-lasting and reservedIn the permanent strength storage standard value, the permanent strength stress storage of the central hole of the compressor can be met, so that the permanent damage of the central hole of the wheel disc in the high-temperature environment is in a controllable range, the safety and reliability of the central hole of the wheel disc are ensured, and the use safety of the wheel disc in the high-temperature operation is ensured.
The preset threshold in this embodiment is used as a basis for judging whether the central hole works at a high temperature, and the value of the preset threshold can be determined according to the material performance and the structural parameters of the compressor. If the corresponding preset threshold value is exceeded, the central hole is indicated to work at high temperature, the permanent strength evaluation is carried out, and whether the corresponding equivalent permanent reserve meets the requirement is calculated.
By the assessment method, the problem that fine and accurate strength calculation and service life analysis cannot be performed in the initial stage of wheel disc design can be avoided; and the repeated estimation by using the stress reserve method is convenient. The permanent strength storage standard value is used as a judgment basis, so that the macroscopic structure size of the center hole of the wheel disc can be determined as soon as possible, manpower and material resources are saved, the utilization rate of materials is improved, and the requirements of reducing the size of the wheel disc and reducing the weight of the wheel disc are met.
Example 2
Referring to fig. 1, the present embodiment illustrates the method and effect of the present invention by performing a stress reserve based compressor wheel center Kong Chijiu damage assessment for a certain model of aircraft engine. The 1 st-stage wheel disk material of the engine compressor is TC17 (alpha-beta two-phase titanium alloy), and part of the material properties are shown in Table 3.
TABLE 3 TC17 partial Material Performance data
As can be seen from Table 3, the tensile strength of TC17 material at room temperature of 20deg.C is 1200MPa; at 200 ℃, the tensile strength of the TC17 material is 1000MPa.
The method comprises the following specific steps:
the first step: calculating the average temperature of the center hole of the wheel disc of the air compressor
And (3) carrying out finite element calculation on the temperatures of all typical stable states (namely working conditions) of the engine, and conveniently obtaining the average temperature of the central hole by adopting path integration by utilizing the calculation result of the finite element.
And a second step of: judging whether to develop a persistent strength reserve evaluation
In this embodiment, the preset threshold value is 10%, that is, when the average temperature of the central hole of the wheel disc causes the yield or tensile strength performance (or) of the material to be reduced by more than 10% compared with the room temperature state, it is indicated that the central hole works at high temperature and the endurance strength should be evaluated.
As can be seen from Table 3, when the temperature reaches 200 ℃, the TC17 material has about (1200-1000)/1200 apprxeq 16.7 percent of yield or tensile strength performance reduced, the performance reduced by more than 10 percent, and the endurance strength evaluation is carried out.
And a third step of: developing persistent strength reserve assessment
And selecting the engine state (namely, n working conditions of which the drop exceeds a preset threshold) for carrying out endurance strength evaluation, calculating the stress of the wheel disc by adopting a finite element, and conveniently obtaining the average circumferential stress of the central hole by adopting a path integral by utilizing the calculation result of the finite element.
Calculating a permanent strength reserve of a disk center hole of the compressor, wherein the permanent strength reserve is calculated in the first placejThe average circumferential stress of the central hole under the working condition is thatjAnd the maximum constant stress of the component is not damaged in the working time and the temperature condition corresponding to the working condition.
Fourth step: computing equivalent persistent reserves
The adoption is based onnAnd under the condition of the working condition persistent static load, the equivalent strength reserve equivalent state is assumed, all the states are converted into one state, and the equivalent strength reserve of the converted state is more than or equal to the standard value of the strength reserve.
The method comprises the following steps:
a) Determining a conversion state
The maximum temperature state is assumed to be a converted state using the equal-intensity reserve equivalent state assumption.
b) The equivalent permanent reserve is determined as:
wherein: a power exponent of the permanent stress-life curve at the highest temperature operating condition;nthe calculated working condition number; equivalent durable storageThe permanent strength reserve value is greater than or equal to the permanent strength reserve standard value, and the permanent strength reserve of the center hole of the air compressor is determined to meet the requirement. In this example, the standard value of the permanent strength reserve was 1.3. If the equivalent permanent storage is smaller than the standard value of the permanent strength storage, the design should be improved, such as the improvement measures of center hole cooling, material replacement, thickening and the like.
In the application, the value of the permanent strength reserve standard value of the recommended compressor center hole when working at high temperature is 1.3, and the intrinsic value principle comprises three aspects of a) to c):
a) In order to ensure safety, the stress reserve of the wheel disc must be larger than 1, and the aeroengine needs to consider that the weight cannot be too large on the basis of ensuring safety, so the lasting strength reserve is generally not larger than 1.5; (note: different engines are adjustable in the permanent strength reserve stress standard of the central hole due to different structures, loads, usage and the like, but should be in the range of 1-1.5);
b) GJB241A-2010 3.3.2.3.5 (rotor overrun) requires: the rotor should be strong enough to withstand a rotor speed of 115% of the steady state maximum allowable speed. Considering the disc stress in the elastic range
Figure 553947DEST_PATH_IMAGE012
And rotation speed
Figure 887976DEST_PATH_IMAGE013
Is proportional to the square of (i.e.)
Figure 761254DEST_PATH_IMAGE014
Wherein
Figure 295747DEST_PATH_IMAGE015
Indicating the rotational speed as
Figure 14305DEST_PATH_IMAGE016
The stress of the wheel disc during the time,
Figure 733999DEST_PATH_IMAGE017
indicating the rotational speed as
Figure 512599DEST_PATH_IMAGE018
The stress of the wheel disc.
The square of 115% of the rotational speed is approximately equal to 1.3, i.e. 115% of the rotational speed reserve has substantially the same effect as the stress reserve of 1.3, so the radial stress (hot load) persistent reserve requirement on any radius in table 2 is also 1.3, and the internal principle is substantially consistent with the present standard.
c) By selecting 8 materials (TC 4, TC17, TC11, TA12, TA19, GH4169, FGH95 and FGH 96) commonly used for the compressor wheel disc, according to the persistent performance data of the materials, the persistent performance data of 30h and 100h are divided by 1.3 respectively, and the stress level obtained by most materials is still lower than the persistent performance data of 300h and 1000h respectively. It is stated that if the compressor central bore takes a permanent strength reserve of 1.3, the permanent life of most material central bore locations can be up to 5 times or more, where permanent damage is essentially negligible, or it can be appreciated that the reduction in material performance when the central bore is operated at elevated temperatures has been considered in the design process.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (4)

1. The method for evaluating the damage of the center Kong Chijiu of the compressor wheel disc based on stress reserve is characterized by comprising the following steps of: the method comprises the following steps:
step 1, calculating average temperatures of center holes of a wheel disc of the compressor under different working conditions;
step 2, judging whether the yield strength or tensile strength of the material corresponding to the average temperature of the center hole of the wheel disc under different working conditions is reduced by more than a preset threshold value compared with the yield strength or tensile strength of the material in a room temperature state, wherein the value of the preset threshold value is 10%;
step 3, aiming at the decrease in step 2 exceeding the preset threshold valuenWheel disc for calculating compressor under various working conditionsPermanent strength reserve of a central bore
Figure QLYQS_1
Wherein->
Figure QLYQS_2
To at the firstjMean circumferential stress of central hole of working condition +.>
Figure QLYQS_3
To at the firstjMaximum constant stress of the components in working time and temperature conditions corresponding to working conditions;
step 4, calculating equivalent persistent reserve
Figure QLYQS_4
Wherein:
Figure QLYQS_5
to be at maximum temperature->
Figure QLYQS_6
A power exponent of the permanent stress-life curve under operating conditions;nthe calculated working condition number; equivalent permanent reserve should be satisfied->
Figure QLYQS_7
And (5) determining that the permanent strength reserve of the central hole of the air compressor meets the requirement when the permanent strength reserve is larger than or equal to the standard value of the permanent strength reserve.
2. The method for evaluating damage to a compressor disk center Kong Chijiu based on stress reserve of claim 1, wherein: in the step 1, the average temperature of the central hole is obtained by using the calculation result of the finite element and adopting the path integral.
3. The method for evaluating damage to a compressor disk center Kong Chijiu based on stress reserve of claim 1, wherein: and 3, calculating the average circumferential stress of the central hole by adopting finite elements, and obtaining the average circumferential stress of the central hole according to path integration.
4. The method for evaluating damage to a compressor disk center Kong Chijiu based on stress reserve of claim 1, wherein: and 4, the standard value of the permanent strength reserve in the step 4 is 1.3.
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