Design method for large-size special-shaped wind tunnel shell under complex temperature and pressure

Abstract

This invention relates to a design method for large-size irregularly shaped wind tunnel shells under complex temperature and pressure conditions, belonging to the field of wind tunnel shell design technology. It aims to solve the design challenges of irregularly shaped wind tunnel shells under complex operating conditions. Based on the aerodynamic profile of a large-size continuous transonic wind tunnel, and combined with the design pressure and temperature of the large-size continuous transonic wind tunnel, a preliminary design of the large-size irregularly shaped wind tunnel shell structure is performed. A finite element simulation model of the large-size irregularly shaped wind tunnel shell structure is established at a 1:1 scale. Operating condition data of the large-size continuous transonic wind tunnel are collected, and simulation analysis is used to obtain temperature and pressure load data for various sections of the large-size irregularly shaped wind tunnel shell under different operating conditions. Simulation analysis is performed to calculate the strength of the large-size irregularly shaped wind tunnel shell structure, and structural reinforcement is implemented for areas where the strength does not meet the design requirements of the large-size irregularly shaped wind tunnel shell structure. This invention is applicable to structural design under complex temperature and pressure conditions.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel shell design technology, specifically relating to a design method for large-sized irregular-shaped wind tunnel shells used under complex temperature and pressure conditions. Background Technology

[0002] With the development of my country's aviation industry, and in order to meet the needs of wind tunnel simulation tests at different altitudes and Mach numbers, my country has designed and constructed several large-scale continuous transonic wind tunnels in recent years. As the main structure of large-scale continuous wind tunnels, the pressure-bearing shell is mostly an irregular and complex structure, and it needs to be able to withstand various complex working conditions and loads. In order to make it have a better structural scheme and higher performance, it is necessary to study a design method for large-scale irregular wind tunnel shells suitable for complex temperature and pressure conditions. Summary of the Invention

[0003] The problem this invention aims to solve is the design challenge of irregularly shaped wind tunnel shells under complex working conditions, and proposes a design method for large-size irregularly shaped wind tunnel shells under complex temperature and pressure conditions.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The design method for large-sized irregularly shaped wind tunnel shells under complex temperature and pressure conditions includes the following steps:

[0006] S1. Based on aerodynamic design, the aerodynamic profile of a large-size continuous transonic wind tunnel is designed. Combining the design pressure and design temperature of the large-size continuous transonic wind tunnel, the shell structure of the large-size irregular wind tunnel is initially designed.

[0007] S2. Process the large-size irregular wind tunnel shell structure obtained in step S1, and then establish a finite element simulation model of the large-size irregular wind tunnel shell structure according to the 1:1 scale of the large-size irregular wind tunnel size.

[0008] S3. Collect operating condition data of large-size continuous transonic wind tunnel, including pure gravity operating condition data, commissioning operating condition data and test operating condition data, and then simulate and analyze to obtain temperature and pressure load data of each part of the large-size irregular wind tunnel shell under different operating conditions.

[0009] S4. Input the temperature and pressure load data of each section of the large-size irregular-shaped wind tunnel shell under different operating conditions obtained in step S3 into the finite element simulation model of the large-size irregular-shaped wind tunnel shell structure established in step S2, perform simulation analysis to calculate the strength of the large-size irregular-shaped wind tunnel shell structure, strengthen the structure of areas whose strength does not meet the design requirements of the large-size irregular-shaped wind tunnel shell structure, and then perform simulation analysis again until the design requirements of the large-size irregular-shaped wind tunnel shell structure are met.

[0010] Furthermore, the specific implementation method of step S1 includes the following steps:

[0011] S1.1. Based on aerodynamic design, the aerodynamic profile of a large-size continuous transonic wind tunnel is functionally divided into sections. The sections of the large-size irregularly shaped wind tunnel shell include a sump section, a contraction section, a first diffusion section, a first corner section, a first transition section, a second corner section, a power section, a second diffusion section, a cooling section, a third corner section, a second transition section, a fourth corner section, and a stabilization section.

[0012] S1.2. Based on the parameters of the inner surface dimensions, thickness, rib height and spacing of the large-size irregular wind tunnel shell section obtained in step S1.1, a preliminary design of the large-size irregular wind tunnel shell structure is carried out.

[0013] The formula for calculating the minimum thickness of the shell of a large-sized, irregularly shaped wind tunnel is as follows:

[0014] ;

[0015] in, The minimum thickness for the shell of a large-sized, irregularly shaped wind tunnel. For the pressure of a large-sized, irregularly shaped wind tunnel shell, D The inner surface diameter of the large-sized, irregularly shaped wind tunnel shell. For design temperature t Allowable stress of shell material for large-sized irregularly shaped wind tunnels;

[0016] The rib height of large-sized, irregularly shaped wind tunnel shells must meet the following requirements:

[0017] ;

[0018] in, h The height of the ribs in a large-sized, irregularly shaped wind tunnel shell;

[0019] The formula for calculating the maximum spacing between adjacent ribs in a large-size irregularly shaped wind tunnel shell is:

[0020] ;

[0021] in, This represents the maximum spacing between adjacent ribs in a large-sized, irregularly shaped wind tunnel shell. The thickness of the shell of a large-sized, irregularly shaped wind tunnel. For coefficients, When the value is mm, Z = 2.1. mm, Z=2.2;

[0022] S1.3. Based on the preliminary design of the large-size irregular-shaped wind tunnel shell structure obtained in step S1.2, structural openings are set according to the specific usage requirements of the wind tunnel. These openings include passageways, manholes, observation windows, and mounting holes for measurement and monitoring equipment to facilitate equipment use, maintenance, and replacement. The structural openings are reinforced, and the formula for calculating the reinforcement area is:

[0023] ;

[0024] Where A is the area of ​​the opening reinforcement. The diameter of the opening;

[0025] The thickness of the shell after reinforcement with openings must satisfy the following relationship:

[0026] ;

[0027] in, The thickness of the large-sized irregular-shaped wind tunnel shell after reinforcement with openings.

[0028] Furthermore, the specific implementation method of step S2 includes the following steps:

[0029] S2.1. The large-size irregular wind tunnel shell structure obtained in step S1 is processed by modeling, and structural openings with an opening diameter of less than or equal to 89mm are deleted to obtain the large-size irregular wind tunnel shell structure after model processing.

[0030] S2.2. For the large-size irregular wind tunnel shell structure processed in step S2.1, a finite element simulation model of the large-size irregular wind tunnel shell structure is established using shell elements in finite element simulation.

[0031] S2.3. Perform two-dimensional mesh generation on the finite element simulation model of the large-size irregular wind tunnel shell structure established in step S2.2.

[0032] Furthermore, the specific implementation method of step S3 includes the following steps:

[0033] S3.1 Collect operating condition data of the large-size continuous transonic wind tunnel, including pure gravity operating condition data, commissioning operating condition data, and test operating condition data. The pure gravity operating condition refers to the operating condition of the large-size continuous transonic wind tunnel under normal temperature and pressure. The commissioning operating condition refers to the operating condition of the large-size continuous transonic wind tunnel under the action of only the maximum or minimum pressure load. The test operating condition refers to the operating condition of the large-size continuous transonic wind tunnel under the combined action of different temperatures and different pressure loads.

[0034] S3.2 Summarize the operating conditions of all large-size continuous transonic wind tunnels and simulate the temperature and pressure load data of each section of the large-size irregular-shaped wind tunnel shell under different operating conditions.

[0035] S3.3. Compare and analyze all operating conditions to extract extreme operating conditions. The extreme operating conditions include the following two types:

[0036] Operating Condition 1: When the wind tunnel is at its highest temperature, extract the maximum pressure value that it can reach, and combine the highest temperature and the maximum pressure value to form Operating Condition 1;

[0037] Operating Condition 2: When the wind tunnel is under maximum pressure, extract the maximum temperature value that it can reach, and combine the maximum pressure and the maximum temperature value to form Operating Condition 2.

[0038] Furthermore, the specific implementation method of step S4 includes the following steps:

[0039] S4.1 Analysis and structural reinforcement under pure gravity conditions: Apply the load under pure gravity conditions to the finite element simulation model of the large-size irregular-shaped wind tunnel shell structure, calculate the strength calculation results of the large-size irregular-shaped pressure shell under pure gravity conditions, and compare whether the calculated stress value is greater than the allowable stress of the material. If the calculated stress value is greater than the allowable stress of the material, structural reinforcement is performed. The structural reinforcement method is one of the following: thickening the shell thickness, increasing the rib height, increasing the rib spacing, changing the local structure to mitigate stress abrupt changes, or reducing the stress concentration area. After structural reinforcement, recalculate the stress value under this condition until the calculated stress value is less than the allowable stress of the material and meets the design conditions.

[0040] S4.2 Analysis and calculation of commissioning conditions and structural reinforcement: Apply the pressure load of the commissioning condition to the finite element simulation model of the large-size irregular wind tunnel shell structure, obtain the strength calculation results of the large-size irregular pressure shell under the commissioning condition, and then carry out structural reinforcement.

[0041] S4.3 Analyze and calculate the test conditions and strengthen the structure: Apply the loads of the extreme operating conditions extracted in step S3.3 to the finite element simulation model of the large-size irregular-shaped wind tunnel shell structure, calculate the strength calculation results of the large-size irregular-shaped pressure shell under the test conditions, and then strengthen the structure.

[0042] The beneficial effects of this invention are:

[0043] The design method for large-size irregular-shaped wind tunnel shells under complex temperature and pressure conditions described in this invention is applicable to the structural design of large-size irregular-shaped wind tunnel shells under complex temperature and pressure conditions. It can effectively solve the design problem of pressure-bearing shells for large-size continuous transonic wind tunnels, standardize the design process, reduce design risks, and improve the overall feasibility and safety of the wind tunnel. Attached Figure Description

[0044] Figure 1This is a flowchart of the design method for a large-size irregularly shaped wind tunnel shell under complex temperature and pressure conditions, as described in this invention.

[0045] Figure 2 This is a schematic diagram of the finite element simulation model of the large-size irregular-shaped wind tunnel shell structure for use under complex temperature and pressure conditions as described in this invention.

[0046] Figure 2 1 is the stagnation section, 2 is the contraction section, 3 is the first diffusion section, 4 is the first corner section, 5 is the first transition section, 6 is the second corner section, 7 is the power section, 8 is the second diffusion section, 9 is the cooling section, 10 is the third corner section, 11 is the second transition section, 12 is the fourth corner section, and 13 is the stabilization section. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described specific embodiments are merely a part of the embodiments of the invention, and not all of them. The components of the specific embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations, and the invention may also have other embodiments.

[0048] Therefore, the following detailed description of specific embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected specific embodiments of the invention. All other specific embodiments obtained by those skilled in the art based on these specific embodiments without inventive effort are within the scope of protection of this invention.

[0049] To further understand the invention's content, features, and effects, the following specific embodiments are provided, along with accompanying drawings. Figure 1 and attached Figure 2 Detailed explanation is as follows: Specific implementation method one:

[0051] A design method for large-sized irregularly shaped wind tunnel shells under complex temperature and pressure conditions includes the following steps:

[0052] S1. Based on aerodynamic design, the aerodynamic profile of a large-size continuous transonic wind tunnel is designed. Combining the design pressure and design temperature of the large-size continuous transonic wind tunnel, the shell structure of the large-size irregular wind tunnel is initially designed.

[0053] Furthermore, the specific implementation method of step S1 includes the following steps:

[0054] S1.1. Based on aerodynamic design, the aerodynamic profile of a large-size continuous transonic wind tunnel is functionally divided into sections. The sections of the large-size irregularly shaped wind tunnel shell include a sump section, a contraction section, a first diffusion section, a first corner section, a first transition section, a second corner section, a power section, a second diffusion section, a cooling section, a third corner section, a second transition section, a fourth corner section, and a stabilization section.

[0055] S1.2. Based on the parameters of the inner surface dimensions, thickness, rib height and spacing of the large-size irregular wind tunnel shell section obtained in step S1.1, a preliminary design of the large-size irregular wind tunnel shell structure is carried out.

[0056] The formula for calculating the minimum thickness of the shell of a large-sized, irregularly shaped wind tunnel is as follows:

[0057] ;

[0058] in, The minimum thickness for the shell of a large-sized, irregularly shaped wind tunnel. For the pressure of a large-sized, irregularly shaped wind tunnel shell, D The inner surface diameter of the large-sized, irregularly shaped wind tunnel shell. For design temperature t Allowable stress of shell material for large-sized irregularly shaped wind tunnels;

[0059] The rib height of large-sized, irregularly shaped wind tunnel shells must meet the following requirements:

[0060] ;

[0061] in, h The height of the ribs in a large-sized, irregularly shaped wind tunnel shell;

[0062] The formula for calculating the maximum spacing between adjacent ribs in a large-size irregularly shaped wind tunnel shell is:

[0063] ;

[0064] in, This represents the maximum spacing between adjacent ribs in a large-sized, irregularly shaped wind tunnel shell. The thickness of the shell of a large-sized, irregularly shaped wind tunnel. For coefficients, When the value is mm, Z = 2.1. mm, Z=2.2;

[0065] S1.3. Based on the preliminary design of the large-size irregular-shaped wind tunnel shell structure obtained in step S1.2, structural openings are set according to the specific usage requirements of the wind tunnel. These openings include passageways, manholes, observation windows, and mounting holes for measurement and monitoring equipment to facilitate equipment use, maintenance, and replacement. The structural openings are reinforced, and the formula for calculating the reinforcement area is:

[0066] ;

[0067] Where A is the area of ​​the opening reinforcement. The diameter of the opening;

[0068] The thickness of the shell after reinforcement with openings must satisfy the following relationship:

[0069] ;

[0070] in, The thickness of the large-sized irregular-shaped wind tunnel shell after reinforcement with openings;

[0071] S2. Process the large-size irregular wind tunnel shell structure obtained in step S1, and then establish a finite element simulation model of the large-size irregular wind tunnel shell structure according to the 1:1 scale of the large-size irregular wind tunnel size.

[0072] Furthermore, the specific implementation method of step S2 includes the following steps:

[0073] S2.1. The large-size irregular wind tunnel shell structure obtained in step S1 is processed by modeling, and structural openings with an opening diameter of less than or equal to 89mm are deleted to obtain the large-size irregular wind tunnel shell structure after model processing.

[0074] For thin-shell structures with a mid-surface curvature radius to shell thickness ratio greater than or equal to 20, shell elements are used for modeling in finite element simulation. The mid-surface of the shell refers to the curved surface formed by points equidistant from the inner and outer surfaces of the shell. The inner and outer surfaces of the shell refer to the two curved surfaces that enclose the shell. The shell thickness refers to the length of the mid-surface normal between the inner and outer surfaces.

[0075] S2.2. For the large-size irregular wind tunnel shell structure processed in step S2.1, a finite element simulation model of the large-size irregular wind tunnel shell structure is established using shell elements in finite element simulation.

[0076] S2.3. Perform two-dimensional mesh generation on the finite element simulation model of the large-size irregular wind tunnel shell structure established in step S2.2;

[0077] S3. Collect operating condition data of large-size continuous transonic wind tunnel, including pure gravity operating condition data, commissioning operating condition data and test operating condition data, and then simulate and analyze to obtain temperature and pressure load data of each part of the large-size irregular wind tunnel shell under different operating conditions.

[0078] Furthermore, the specific implementation method of step S3 includes the following steps:

[0079] S3.1 Collect operating condition data of the large-size continuous transonic wind tunnel, including pure gravity operating condition data, commissioning operating condition data, and test operating condition data. The pure gravity operating condition refers to the operating condition of the large-size continuous transonic wind tunnel under normal temperature and pressure. The commissioning operating condition refers to the operating condition of the large-size continuous transonic wind tunnel under the action of only the maximum or minimum pressure load. The test operating condition refers to the operating condition of the large-size continuous transonic wind tunnel under the combined action of different temperatures and different pressure loads.

[0080] S3.2 Summarize the operating conditions of all large-size continuous transonic wind tunnels and simulate the temperature and pressure load data of each section of the large-size irregular-shaped wind tunnel shell under different operating conditions.

[0081] S3.3. Compare and analyze all operating conditions to extract extreme operating conditions. The extreme operating conditions include the following two types:

[0082] Operating Condition 1: When the wind tunnel is at its highest temperature, extract the maximum pressure value that it can reach, and combine the highest temperature and the maximum pressure value to form Operating Condition 1;

[0083] Operating Condition 2: When the wind tunnel is under maximum pressure, extract the maximum temperature value that it can reach, and combine the maximum pressure and the maximum temperature value to form Operating Condition 2;

[0084] S4. Input the temperature and pressure load data of each section of the large-size irregular-shaped wind tunnel shell under different operating conditions obtained in step S3 into the finite element simulation model of the large-size irregular-shaped wind tunnel shell structure established in step S2, perform simulation analysis to calculate the strength of the large-size irregular-shaped wind tunnel shell structure, strengthen the structure of areas whose strength does not meet the design requirements of the large-size irregular-shaped wind tunnel shell structure, and then perform simulation analysis again until the design requirements of the large-size irregular-shaped wind tunnel shell structure are met.

[0085] Furthermore, the specific implementation method of step S4 includes the following steps:

[0086] S4.1 Analysis and structural reinforcement under pure gravity conditions: Apply the load under pure gravity conditions to the finite element simulation model of the large-size irregular-shaped wind tunnel shell structure, calculate the strength calculation results of the large-size irregular-shaped pressure shell under pure gravity conditions, and compare whether the calculated stress value is greater than the allowable stress of the material. If the calculated stress value is greater than the allowable stress of the material, structural reinforcement is performed. The structural reinforcement method is one of the following: thickening the shell thickness, increasing the rib height, increasing the rib spacing, changing the local structure to mitigate stress abrupt changes, or reducing the stress concentration area. After structural reinforcement, recalculate the stress value under this condition until the calculated stress value is less than the allowable stress of the material and meets the design conditions.

[0087] S4.2 Analysis and calculation of commissioning conditions and structural reinforcement: Apply the pressure load of the commissioning condition to the finite element simulation model of the large-size irregular wind tunnel shell structure, obtain the strength calculation results of the large-size irregular pressure shell under the commissioning condition, and then carry out structural reinforcement.

[0088] S4.3 Analyze and calculate the test conditions and strengthen the structure: Apply the loads of the extreme operating conditions extracted in step S3.3 to the finite element simulation model of the large-size irregular-shaped wind tunnel shell structure, calculate the strength calculation results of the large-size irregular-shaped pressure shell under the test conditions, and then strengthen the structure.

[0089] Furthermore, at different temperatures, the allowable stress of a material gradually decreases as the temperature rises. When comparing whether the calculated stress meets the strength requirements, it should be compared with the allowable stress of the material at that operating temperature.

[0090] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0091] Although this application has been described above with reference to specific embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of this application. In particular, as long as there is no structural conflict, the features in the specific embodiments disclosed in this application can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, this application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for designing a large size complex shaped wind tunnel shell under complex temperature and pressure, characterized in that, Comprising the following steps: S1, based on the aerodynamic profile of the large-size continuous transonic wind tunnel, combining the design pressure and the design temperature of the large-size continuous transonic wind tunnel, the large-size special-shaped wind tunnel shell structure is preliminarily designed; The specific implementation method of step S1 comprises the following steps: S1.1, based on the aerodynamic profile of the large-size continuous transonic wind tunnel, the large-size special-shaped wind tunnel shell is functionally divided into sections, and the large-size special-shaped wind tunnel shell section includes a standing chamber section, a contraction section, a first diffusion section, a first corner section, a first transition section, a second corner section, a power section, a second diffusion section, a cooling section, a third corner section, a second transition section, a fourth corner section, and a stable section; S1.2, based on the parameters of the inner surface size, thickness, rib height and spacing of the large-size special-shaped wind tunnel shell, the large-size special-shaped wind tunnel shell structure is preliminarily designed for the large-size special-shaped wind tunnel shell section obtained in step S1.1; The calculation formula of the minimum value of the thickness of the large-size special-shaped wind tunnel shell is: ； wherein, is the minimum thickness of the large size irregular wind tunnel shell, is the pressure of the large size irregular wind tunnel shell, D is the inner surface diameter of the large size irregular wind tunnel shell, is the allowable stress of the large size irregular wind tunnel shell material at the design temperature t; The rib height of the large-size special-shaped wind tunnel shell shall meet the following requirements: ； Wherein, h is the rib height of the large-size special-shaped wind tunnel shell; The calculation formula of the maximum value of the spacing of adjacent ribs of the large-size special-shaped wind tunnel shell is: ； wherein is the maximum value of the distance between adjacent ribs of the large-size profiled wind tunnel shell, is the thickness of the large-size profiled wind tunnel shell, is the coefficient, Z = 2.1 when L = 0.5 mm, Z = 2.2 when L = 0.6 mm. S1.3, based on the preliminarily designed large-size special-shaped wind tunnel shell structure obtained in step S1.2, according to the specific use requirements of the wind tunnel, the structure opening is set, the structure opening includes the channel, the manhole, the observation window, the measuring monitoring equipment installation hole for facilitating the use, the maintenance and the replacement of the equipment, the structure opening is reinforced, and the calculation formula of the opening reinforcing area is: ； wherein A is the open area reinforcement, is the open diameter; The shell thickness after opening reinforcing shall meet the following relationship: ； wherein, t is the thickness of the large-size irregular wind tunnel shell after opening reinforcement; S2, the model of the large-size special-shaped wind tunnel shell structure obtained in step S1 is processed, and then the finite element simulation model of the large-size special-shaped wind tunnel shell structure is established according to the size of the large-size special-shaped wind tunnel 1:1; S3, the use condition data of the large-size continuous transonic wind tunnel is collected, including the pure gravity condition data, the debugging condition data and the test condition data, and then the temperature and pressure load data of each section of the large-size special-shaped wind tunnel shell under different use conditions are obtained through simulation analysis; S4, the temperature and pressure load data of each section of the large-size special-shaped wind tunnel shell under different use conditions obtained in step S3 are input into the finite element simulation model of the large-size special-shaped wind tunnel shell structure established in step S2, the strength of the large-size special-shaped wind tunnel shell structure is calculated through simulation analysis, the structure of the area which does not meet the design requirements of the large-size special-shaped wind tunnel shell structure is reinforced, and then the simulation analysis is carried out again until the design requirements of the large-size special-shaped wind tunnel shell structure are met.

2. A method for designing a large size complex shaped wind tunnel shell for complex temperature and pressure, according to claim 1, wherein, The specific implementation method of step S2 comprises the following steps: S2.1, the model of the large-size special-shaped wind tunnel shell structure obtained in step S1 is processed, and the structure opening with an opening diameter less than or equal to 89mm is deleted to obtain the large-size special-shaped wind tunnel shell structure after model processing; S2.2, the finite element simulation model of the large-size special-shaped wind tunnel shell structure is established by using shell element in the finite element simulation for the large-size special-shaped wind tunnel shell structure after model processing in step S2.1; S2.3, two-dimensional meshing is performed on the large-size special-shaped wind tunnel shell structure finite element simulation model established in step S2.

2.

3. A method for designing a large size complex shaped wind tunnel shell for complex temperature and pressure, according to claim 2, wherein, The specific implementation method of step S3 includes the following steps: S3.1, collect the use condition data of the large-size continuous transonic wind tunnel, including pure gravity condition data, debugging condition data and test condition data, the pure gravity condition refers to the working condition of the large-size continuous transonic wind tunnel under normal temperature and pressure, the debugging condition refers to the working condition of the large-size continuous transonic wind tunnel only under the action of maximum or minimum pressure load; the test condition refers to the working condition of the large-size continuous transonic wind tunnel under the combined action of different temperatures and different pressure loads; S3.2, summarize all the use conditions of the large-size continuous transonic wind tunnel, and simulate to obtain the temperature and pressure load data of each section of the large-size special-shaped wind tunnel shell under different use conditions; S3.3, compare and analyze all use conditions, and extract extreme use conditions, the extreme use conditions include the following two conditions: Condition one: when the wind tunnel is at the highest temperature, the limit pressure value that can be reached is extracted, and the highest temperature and the limit pressure value form condition one; Condition two: when the wind tunnel is at the maximum pressure, the limit temperature value that can be reached is extracted, and the maximum pressure and the limit temperature value form condition two.

4. The method for designing a large size complex shaped wind tunnel shell under complex temperature and pressure as claimed in claim 3 wherein, The specific implementation method of step S4 includes the following steps: S4.1, analysis and calculation of pure gravity condition and structure reinforcement: the load under pure gravity condition is applied to the large-size special-shaped wind tunnel shell structure finite element simulation model, the strength calculation result of the large-size special-shaped pressure shell under pure gravity condition is calculated, and the calculated stress value is compared with the allowable stress of the material. If the calculated stress value is greater than the allowable stress of the material, structure reinforcement is performed, the structure reinforcement method is one of thickening the shell thickness, increasing the rib plate height, densifying the rib plate spacing, changing the local structure to slow down the stress mutation and reducing the stress concentration area. After structure reinforcement, the stress value under this condition is recalculated until the calculated stress value is less than the material allowable stress, which meets the design condition; S4.2, analysis and calculation of debugging condition and structure reinforcement: the pressure load of debugging condition is applied to the large-size special-shaped wind tunnel shell structure finite element simulation model, the strength calculation result of the large-size special-shaped pressure shell under debugging condition is obtained, and then structure reinforcement is performed; S4.3, analysis and calculation of test condition and structure reinforcement: the load of the extreme use condition extracted in step S3.3 is applied to the large-size special-shaped wind tunnel shell structure finite element simulation model, the strength calculation result of the large-size special-shaped pressure shell under test condition is calculated, and then structure reinforcement is performed.

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