Simulation method and system for obtaining a combustion simulation part based on a complex part

Abstract

The present invention provides a simulation method and system for obtaining a combustion simulation part based on a complex part, including: Step 1: Statistically analyze the shape parameters of the complex part; Step 2: Characterize the complex part as a square flat plate and a cylindrical straight bar; Step 3: Scale down the area of the characterized plate and the length of the bar proportionally; Step 4: Characterize the connection parameters between the plate and the bar in the complex part; Step 5: Connect the proportionally scaled-down plate and bar with the characterized connection parameters to obtain a combustion simulation part. The present invention can simplify the complex part into a simulation part that only includes a square flat plate and a cylindrical straight bar, characterize the shape parameters that affect the fire behaviors such as ignition and combustion of the complex part and reflect them in the combustion simulation part, providing the possibility for studying the fire behaviors of the complex part.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material combustion, and specifically, to a simulation method and system for obtaining a combustion simulation part based on a complex part. Background Art

[0002] Lightweight magnesium, aluminum, and titanium alloys have broad application prospects in fields such as transportation, aerospace, especially the lightest magnesium alloy material. Research shows that for every 10% reduction in vehicle weight, energy consumption decreases by about 8%, and pollutant emissions decrease by about 4%; while the fuel savings brought by the application of magnesium alloy on commercial aircraft is 100 times that of the application of the same mass of magnesium alloy in the automotive field. However, the thermal inertia of light alloys is generally small and is extremely easy to be ignited under the heating of an external heat source, especially magnesium alloy and titanium alloy. Currently, the flammability problem has become a bottleneck restricting the application of magnesium alloy and titanium alloy in the aerospace field. Therefore, it is extremely important to study the fire behavior of light alloy parts, which is the key to ensuring the safe service of parts.

[0003] Patent document CN113792398A (application number: CN202111053011.2) discloses a design method for a simulation specimen of the hole structure characteristics of a combustion chamber casing, calculates and evaluates the influence boundary of the hole structure characteristic part of the combustion chamber casing, determines the local and overall morphology of the specimen simulating the hole structure characteristic; and optimizes the design of the local size and load mode of the hole structure characteristic simulation specimen according to the condition of the consistency of the stress intensity factor distribution of the virtual crack front of the same specification.

[0004] However, most lightweight parts are relatively complex, such as aeroengines, casings, automotive engines, shock towers, subframes, etc., so it has become a major problem to study their fire behavior. At the same time, it is also very difficult to obtain key fire parameters such as the ignition time of these complex parts under external flame heating and the flame spread rate after ignition, and thus it is impossible to provide theoretical guidance for the fire prevention design of parts and ensure the safe service of parts. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a simulation method and system for obtaining a combustion simulation part based on a complex part.

[0006] The simulation method for obtaining a combustion simulation part based on a complex part according to the present invention includes:

[0007] Step 1: Statistically analyze the shape parameters of the complex part;

[0008] Step 2: Characterize the complex part as a square flat plate and a columnar straight bar;

[0009] Step 3: Scale down the area of the characterized plate and the length of the bar in proportion;

[0010] Step 4: Characterize the joining parameters of the plate and the strip in the complex part;

[0011] Step 5: Join the scaled-down plate and strip with the characteristic joining parameters to obtain a combustion simulation part.

[0012] Preferably, the shape parameters of the complex part include the volume, thickness, number of areas of the plate, the cross-sectional area, perimeter, volume, and length of the reinforcing rib or connecting strip, and the joining parameters between the plate and the reinforcing rib or connecting strip.

[0013] Preferably, the said Step 2 includes:

[0014] Step 2.1: Calculate the total volume of the plate in the complex part and the total mid-axis area in the thickness direction based on the parameters counted in Step 1, and divide the total volume by the total mid-axis area to obtain the average thickness. Then, for the characterized square flat plate, its bottom area is the total mid-axis area of the plate in the complex part, and its thickness is the calculated average thickness;

[0015] Step 2.2: Calculate the total length and total volume of the reinforcing ribs and connecting strips in the complex part based on the parameters counted in Step 1, and divide the total volume by the total length to obtain the average cross-sectional area; Calculate the cross-sectional dimensions of the characterized columnar straight strip according to the cross-sectional shapes of the reinforcing ribs and connecting strips in the complex part. Then, for the characterized columnar straight strip, its length is the total length of the reinforcing ribs and connecting strips in the complex part, its cross-sectional area is the calculated average cross-sectional area, and its cross-sectional dimensions are the calculated cross-sectional dimensions.

[0016] Preferably, the said Step 2.2 includes:

[0017] Step 2.2.1: Calculate the average cross-sectional area S and average cross-sectional perimeter l of each strip-shaped part in the complex part c , and then calculate the l c / S ratio of each strip;

[0018] Step 2.2.2: Calculate the average l c / S ratio with the length of each strip as the weight, and then determine the perimeter of the characterized columnar rectangular strip or round strip in combination with the average cross-sectional area calculated in Step 2.2;

[0019] Step 2.2.3: Calculate the width and thickness of the columnar rectangular strip or the diameter of the round strip according to the average cross-sectional area and the calculated perimeter.

[0020] Preferably, the said Step 4 includes:

[0021] The joining parameters include the joining position, joining angle, length of the transition arc, and curvature between the plate and the strip;

[0022] The characterization refers to calculating the average joining position, joining angle, length of the transition arc, and curvature weighted by the quantity according to the joining parameters of each group of plates and bars.

[0023] According to the simulation system for obtaining a combustion simulation part based on a complex part provided by the present invention, it includes:

[0024] Module M1: Statistically analyze the shape parameters of the complex part;

[0025] Module M2: Characterize the complex part into a square flat plate and a cylindrical straight bar;

[0026] Module M3: Proportionally reduce the area of the plate and the length of the bar after characterization;

[0027] Module M4: Characterize the joining parameters of the plate and the bar in the complex part;

[0028] Module M5: Join the proportionally reduced plate and bar with the characterized joining parameters to obtain a combustion simulation part.

[0029] Preferably, the shape parameters of the complex part include the volume, thickness, area number of the plate, cross-sectional area and perimeter, volume, length of the reinforcing rib or connecting bar, and the joining parameters between the plate and the reinforcing rib or connecting bar.

[0030] Preferably, the module M2 includes:

[0031] Module M2.1: Calculate the total volume of the plate in the complex part and the total central plane area in the thickness direction based on the parameters statistically analyzed in module M1, and obtain the average thickness by dividing the total volume by the total central plane area. For the characterized square flat plate, its bottom area is the total central plane area of the plate in the complex part, and its thickness is the calculated average thickness;

[0032] Module M2.2: Calculate the total length and total volume of the reinforcing ribs and connecting bars in the complex part based on the parameters statistically analyzed in module M1, and obtain the average cross-sectional area by dividing the total volume by the total length; calculate the cross-sectional dimensions of the characterized cylindrical straight bar according to the cross-sectional shapes of the reinforcing ribs and connecting bars in the complex part. For the characterized cylindrical straight bar, its length is the total length of the reinforcing ribs and connecting bars in the complex part, its cross-sectional area is the calculated average cross-sectional area, and its cross-sectional dimensions are the calculated cross-sectional dimensions.

[0033] Preferably, the module M2.2 includes:

[0034] Module M2.2.1: Calculate the average cross-sectional area S and average cross-sectional perimeter l of each strip-shaped part in the complex part c , and then calculate the l c / S ratio of each bar;

[0035] Module M2.2.2: Calculate the average l c / S ratio with the length of each bar as the weight, and then determine the perimeter of the characterized columnar rectangular bar or circular bar in combination with the average cross-sectional area calculated in Module M2.2;

[0036] Module M2.2.3: Calculate the width and thickness of the columnar rectangular bar or the diameter of the circular bar based on the average cross-sectional area and the calculated perimeter.

[0037] Preferably, the module M4 includes:

[0038] The connection parameters include the connection position, connection angle, transition arc length, and curvature of the plate and the bar;

[0039] The characterization means calculating the average connection position, connection angle, transition arc length, and curvature with the quantity as the weight according to the connection parameters of each group of plates and bars.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention can simplify complex parts into a simulation part only including a square flat plate and a columnar straight bar, characterize the shape parameters affecting the fire behaviors such as ignition and combustion of complex parts and reflect them in the combustion simulation part, providing the possibility for studying the fire behaviors of complex parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes, and advantages of the present invention will become more obvious:

[0043] Figure 1 is the flow diagram of the present invention;

[0044] Figure 2 is the schematic diagram of the complex casing part to be simplified by the present invention;

[0045] Figure 3a is the schematic diagram of the combustion simulation part of the complex casing part in the present invention, Figure 3b is the front view, Figure 3c is the left view, Figure 3d is the top view. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The present invention will be described in detail below in combination with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those of ordinary skill in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0047] Example 1:

[0048] The present invention fully considers the shape parameters affecting the fire behavior in complex parts and characterizes them as a square flat plate plus a columnar straight bar, and also considers the joining position, joining angle, transition arc length and curvature between the two. In complex parts, the commonly occurring structural forms are plates and bars. Among them, the plate may be a curved plate or a flat plate. For simplicity, it is uniformly characterized as a square flat plate; while the bar is usually a columnar straight bar, often appearing in the form of a reinforcing rib or a connecting bar. Among them, the flat plate is commonly used to study the ignition behavior of alloy materials, and the straight bar is commonly used to study the combustion propagation behavior of alloy materials. In addition, the position, angle, transition arc length and curvature where the straight bar joins the flat plate will all affect the flame propagation rate during combustion. Therefore, when simplifying a complex part into a combustion simulation part, five aspects of parameters need to be determined: (1) the bottom area and thickness of the square flat plate; (2) the length, width and thickness of the columnar straight bar; (3) the position where the bar and the plate join; (4) the angle where the bar and the plate join; (5) the length and curvature of the transition arc at the joint of the bar and the plate. The present invention provides a theoretical support for the characterization of these five aspects of parameters.

[0049] (1) The square flat plate is commonly used to study the ignition process of alloy materials. Usually, the center of the vertically placed flat plate is heated by a flame. Under the flame heating, an oxide film is first formed on the surface of the flat plate; as the temperature rises, the heating area begins to melt, and the melted liquid will evaporate to form vapor; when the gravity generated by the melted liquid causes the oxide film to be broken, the vapor will escape and be instantly ignited by the flame, thereby igniting the entire sample. During the whole process, the ignition time t is proportional to the amount of liquid that the oxide film can wrap, and the amount of liquid that the oxide film can wrap is usually proportional to the volume V0 corresponding to the heating area A0. Among them, the volume V0 = the heating area A0 × the thickness d of the flat plate, so the ignition time t is proportional to the thickness d of the flat plate. During the ignition process of the square flat plate, the influence of its area on the ignition time is relatively small, and its thickness usually determines the ignition time. Therefore, when simplifying the complex part in step 2, its characteristic thickness needs to be calculated with the area as the weight; when performing equal-proportion reduction in step 3, the bottom area with little influence should be reduced, while the characteristic thickness remains unchanged.

[0050] (2) The columnar straight bar is commonly used to study the combustion propagation process of magnesium alloy materials. Usually, the lowest end of the vertically suspended straight bar is heated by an external flame, and the external flame is removed after the straight bar is ignited. Then the ignited straight bar will oxidize violently and emit a stable flame to heat the remaining sample. During the process of the remaining sample being heated by its own flame, it can be equivalently considered that a stable flame with a height of δ f is heating the sample section by section until it is ignited. Since the flame is on the surface, the heating area = the cross-sectional perimeter l c × the height δ of the heated sectionf and the energy input by flame heating is proportional to the heating area δ f l c The volume of each section heated by the flame = the cross-sectional area S of the sample × the height δ of the heated section f and the energy required for each section to be heated to the ignition point and ignited is proportional to the heated volume δ f S. Other parameters such as the flame heat flux parameters such as density ρ, the heat ΔH required to heat a unit mass of the sample from the initial temperature to the ignition point, etc. are mainly related to the material, so they can be regarded as constants when studying the shape and size factors of the sample. According to the law of conservation of energy, the energy input by flame heating the energy δ required for the sample to be heated and ignited f SρΔH. In addition, the time required for the flame to spread δ f is exactly the time t for the flame to ignite a section of the sample with a height of δ f Then the flame spread rate v f = δ f / t f is proportional to l f / S, and the other parameters are constants under the conditions of the same material, the same volume, and the same length. Therefore, when characterizing the strip in step 2, it is necessary to determine the characteristic cross-sectional area S according to the total volume and the total length; then calculate the average l c / S with the length as the weight to ensure that the combustion spread rate of the characterized columnar straight bar is the average combustion spread rate; finally, calculate l c according to the values of S and l c / S c , and then determine the width, thickness of the rectangular cross-section or the diameter of the circular cross-section, and finally determine the dimensions of the entire characteristic columnar straight bar. And when performing equal-proportion reduction in step 3, the length that does not affect the combustion spread rate should be reduced, and the cross-sectional parameters of the columnar straight bar should not be changed.

[0051] (3) The position where the strip meets the plate affects the ease of combustion spread. When the flame spreads upward along the columnar straight strip to the position where the strip meets the plate, the meeting position affects the convection of soot and oxygen, thereby affecting the flame size and its heating of the next area. When the meeting position is at the corner of the square plate, about one-fourth of the area above the flame is blocked by the flat plate, which has a relatively small impact on the oxygen concentration and flame size, so the flame spread is relatively easy; when the meeting position is on the edge of the square plate, about one-half of the area above the flame is blocked by the flat plate, so the flame spread is relatively difficult; when the meeting position is inside the square flat plate and close to one side, most of the area above the flame is blocked by the flat plate, and the flame spread is even more difficult; when the meeting position is at the exact center of the square flat plate, the area above the flame is completely blocked by the flat plate, and the flame spread is the most difficult. Therefore, when determining the characteristic meeting position in step 4, it is necessary to calculate the average meeting position of each meeting position in the complex part with the quantity as the weight.

[0052] (4) The angle at which the strip meets the plate affects the ease of combustion spread. When the entire simulated part is fixed, the columnar straight strip is usually kept vertical, and then the lowest end of the strip is ignited to let the flame spread vertically upward. When the flame spreads to the position where the strip meets the plate, due to the certain angle between the strip and the plate, the vertical area that the flame can heat will become smaller, that is, the energy input by the flame will decrease; in addition, the meeting method with a certain included angle will bear the shear stress induced by the gravity of the lower strip, and thus is extremely prone to shear deformation and cause dropping, resulting in the interruption of flame propagation. The farther the included angle deviates from 0° and 180°, the smaller the area that the flame can heat, and the less energy provided by the flame; at the same time, the shear stress borne by the meeting position will also be the largest. Therefore, the combustion spread is the most difficult when the included angle is 90°. Therefore, when determining the characteristic meeting angle in step 4, it is necessary to calculate the average meeting angle of each meeting angle in the complex part with the quantity as the weight.

[0053] (5) The length and curvature of the transition arc on the strip when the strip meets the plate affect the combustion spread process. When the flame spreads upward along the columnar straight strip to the position where the strip meets the plate, the length of the transition arc mainly affects the flame spread time, while the size of the curvature of the transition arc affects the combustion spread rate. The existence of the transition arc makes the area V1 that the flame needs to heat become larger and larger, and the flame size is usually proportional to the volume V0 of its burning part. Therefore, its combustion spread rate is proportional to the ratio of V0 / V1. The larger the curvature of the transition arc, the larger the ratio of V0 / V1, and the smaller the combustion spread rate. Therefore, when determining the characteristic curvature of the transition arc in step 4, it is necessary to calculate the average curvature of the transition arc of each transition arc in the complex part with the quantity as the weight.

[0054] Based on the theoretical explanations and simplification principles of the above five parts, a complex part can be simplified into a simulation part that only includes a square flat plate and a columnar straight bar, and the connection parameters between the two are considered. This simulation part can reflect key fire parameters such as the ignition time and combustion spread rate of the complex part and is very convenient for ignition and combustion test research. This provides the possibility for studying the fire behavior of complex parts, which is conducive to guiding the fire prevention design of complex parts and thus ensuring the safe service of the parts.

[0055] As Figure 1 shown, the present invention provides a simulation method for obtaining a combustion simulation part based on a complex part, including the following steps:

[0056] Step 1: Statistically analyze the shape parameters of the complex part.

[0057] As Figure 2 、 Figures 3a to 3d shown, the complex casing part to be simplified in the present invention is: (1) Statistically analyze the area and thickness of each plate in the casing part, where the area of each plate is the area corresponding to the mid-axis plane in the thickness direction. Calculate that the total mid-axis plane area of the plate is 174432 mm 2 , and the total volume is 2407162 mm 3 . (2) Statistically analyze the length and volume of each bar in the casing part, calculate that the total length of the bars is 1835 mm, and the total volume is 130248 mm 3 ; among them, the total length of the bars with l c / S approximately 0.8 / mm is 710 mm, and the total length of the bars with l c / S approximately 0.4 / mm is 1125 mm. (3) The connection positions between the bars and the plates in the casing part are basically on the corresponding mid-axis lines. There are 4 connection positions with a length from the edge approximately 1 / 3 of the whole; there are 6 connection positions with a length from the edge approximately 1 / 4 of the whole. (4) There are 4 bars with a connection angle approximately 30°; there are 6 bars with a connection angle approximately 90°. (5) There are 4 bars with a transition arc along the longitudinal length of the bar approximately 12 mm and a curvature approximately 0.0345 / mm; there are 6 bars with a transition arc along the longitudinal length of the bar approximately 9 mm and a curvature approximately 0.0709 / mm.

[0058] Step 2: Characterize the complex part as a square flat plate and a columnar straight bar.

[0059] According to the parameters statistically analyzed in Step 1, calculate that the characteristic thickness of the square flat plate is 13.80 mm, and the characteristic bottom area is 174432 mm 2 ; calculate that the characteristic length of the columnar straight bar is 1835 mm, the characteristic cross-sectional area S is 70.98 mm 2 , and the characteristic l cThe / S ratio is 0.5548 / mm; and then the characteristic perimeter l is calculated. c is 39.38mm, the characteristic width is 14.94mm, and the characteristic thickness is 4.75mm.

[0060] Step 3: Scale down the area of the characterized plate and the length of the strip in equal proportion.

[0061] Scale down the area of the characteristic square flat plate and the length of the characteristic columnar straight strip obtained in Step 2 in a ratio of 20:1. Then the size of the scaled-down square flat plate is 93.39mm × 93.39mm × 13.80mm; and the size of the shortened columnar straight strip is 91.75mm × 14.94mm × 4.75mm.

[0062] Step 4: Characterize the connection parameters between the plate and the strip in the complex part.

[0063] Calculate the characteristic connection position, characteristic connection angle, characteristic transition arc length and curvature respectively according to the connection parameters counted in Step 1. Then the characteristic connection position is on a symmetry axis of the square flat plate, and the distances from two of its sides are 1 / 2 of the side length, that is, 46.695mm; the distance from the third side is 26.4605mm; the distance from the fourth side is 66.9295mm. The characteristic connection angle is 66°. The length of the characteristic transition arc along the longitudinal direction of the strip is the average length of the transition arcs along the longitudinal direction of the strips with transition arcs, and the characteristic transition arc curvature is the average transition arc curvature of all strips. Then the length of the characteristic transition arc along the longitudinal direction of the strip is 10.20mm, and the characteristic transition arc curvature is 0.05634 / mm, that is, the radius of curvature of the characteristic transition arc is 17.75mm.

[0064] Step 5: Connect the scaled-down plate and strip with the characteristic connection parameters to obtain the combustion simulation part.

[0065] Connect the scaled-down square flat plate and columnar straight strip in Step 3 with the connection parameters such as the characteristic connection position, characteristic connection angle, characteristic transition arc length and curvature calculated in Step 4 to obtain the combustion simulation part.

[0066] Embodiment 2:

[0067] The present invention also provides a simulation system for obtaining a combustion simulation part based on a complex part. The simulation system for obtaining a combustion simulation part based on a complex part can be realized by executing the process steps of the simulation method for obtaining a combustion simulation part based on a complex part. That is, those skilled in the art can understand the simulation method for obtaining a combustion simulation part based on a complex part as the preferred implementation manner of the simulation system for obtaining a combustion simulation part based on a complex part.

[0068] A simulation system for obtaining a combustion simulation part based on a complex part according to the present invention includes: Module M1: Statistically analyzing the shape parameters of the complex part; Module M2: Characterizing the complex part into a square flat plate and a columnar straight bar; Module M3: Reducing the area of the characterized plate and the length of the bar in equal proportion; Module M4: Characterizing the connection parameters between the plate and the bar in the complex part; Module M5: Connecting the equally reduced plate and bar with the characterized connection parameters to obtain a combustion simulation part.

[0069] The shape parameters of the complex part include the volume, thickness, area number of the plate, the cross-sectional area, perimeter, volume, and length of the reinforcing rib or connecting bar, and the connection parameters between the plate and the reinforcing rib or connecting bar.

[0070] The said Module M2 includes: Module M2.1: Calculating the total volume of the plate in the complex part and the total mid-axis plane area in the thickness direction based on the parameters statistically analyzed in Module M1, and obtaining the average thickness by dividing the total volume by the total mid-axis plane area. Then, for the characterized square flat plate, its bottom area is the total mid-axis plane area of the plate in the complex part, and its thickness is the calculated average thickness; Module M2.2: Calculating the total length and total volume of the reinforcing ribs and connecting bars in the complex part based on the parameters statistically analyzed in Module M1, and obtaining the average cross-sectional area by dividing the total volume by the total length; Calculating the cross-sectional dimensions of the characterized columnar straight bar according to the cross-sectional shapes of the reinforcing ribs and connecting bars in the complex part. Then, for the characterized columnar straight bar, its length is the total length of the reinforcing ribs and connecting bars in the complex part, its cross-sectional area is the calculated average cross-sectional area, and its cross-sectional dimensions are the calculated cross-sectional dimensions.

[0071] The said Module M2.2 includes: Module M2.2.1: Calculating the average cross-sectional area S and average cross-sectional perimeter l of each strip-shaped part in the complex part c , and then calculating the l c / S ratio of each strip; Module M2.2.2: Calculating the average l c / S ratio with the length of each strip as the weight, and then determining the perimeter of the characterized columnar rectangular bar or circular bar in combination with the average cross-sectional area calculated in Module M2.2; Module M2.2.3: Calculating the width and thickness of the columnar rectangular bar or the diameter of the circular bar according to the average cross-sectional area and the calculated perimeter.

[0072] The said Module M4 includes: The connection parameters include the connection position, connection angle, transition arc length, and curvature between the plate and the bar; The characterization means calculating the average connection position, connection angle, transition arc length, and curvature with the quantity as the weight according to the connection parameters of each group of the plate and the bar.

[0073] Those skilled in the art know that in addition to implementing the systems, devices, and their respective modules provided by the present invention in the form of pure computer-readable program code, it is entirely possible to logically program the method steps to enable the systems, devices, and their respective modules provided by the present invention to be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers, etc., to implement the same program. Therefore, the systems, devices, and their respective modules provided by the present invention can be considered as a kind of hardware component, and the modules included therein for implementing various programs can also be regarded as the structures within the hardware component; the modules for implementing various functions can also be regarded as either software programs for implementing the method or the structures within the hardware component.

[0074] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A simulation method for obtaining a combustion simulation part based on a complex part, characterized in that, Including: Step 1: Statistically analyze the shape parameters of the complex part; Step 2: Characterize the complex part as a square flat plate and a cylindrical straight bar; Step 3: Proportionally reduce the area of the characterized plate and the length of the bar; Step 4: Characterize the connection parameters between the plate and the bar in the complex part; Step 5: Connect the proportionally reduced plate and bar with the characterized connection parameters to obtain a combustion simulation part; The shape parameters of the complex part include the volume, thickness, area number of the plate, the cross-sectional area and perimeter, volume, and length of the reinforcing rib or connecting bar, and the connection parameters between the plate and the reinforcing rib or connecting bar; The said Step 2 includes: Step 2.1: Calculate the total volume of the plate in the complex part and the total mid-axis plane area in the thickness direction based on the parameters statistically analyzed in Step 1, and obtain the average thickness by dividing the total volume by the total mid-axis plane area. For the characterized square flat plate, its bottom area is the total mid-axis plane area of the plate in the complex part, and its thickness is the calculated average thickness; Step 2.2: Calculate the total length and total volume of the reinforcing ribs and connecting bars in the complex part based on the parameters statistically analyzed in Step 1, and obtain the average cross-sectional area by dividing the total volume by the total length; Calculate the cross-sectional dimensions of the characterized cylindrical straight bar according to the cross-sectional shapes of the reinforcing ribs and connecting bars in the complex part. For the characterized cylindrical straight bar, its length is the total length of the reinforcing ribs and connecting bars in the complex part, its cross-sectional area is the calculated average cross-sectional area, and its cross-sectional dimensions are the calculated cross-sectional dimensions; The said Step 2.2 includes: Step 2.2.1: Calculate the average cross-sectional area S and the average cross-sectional perimeter l of each strip-shaped part in the complex part c , and then calculate the l c / S ratio for each strip; Step 2.2.2: Calculate the average l c / S ratio with the length of each bar as the weight, and then determine the perimeter of the characterized columnar rectangular bar or round bar in combination with the average cross-sectional area calculated in Step 2.2; Step 2.2.3: Calculate the width and thickness of the cylindrical rectangular bar or the diameter of the circular bar based on the average cross-sectional area and the calculated perimeter.

2. The simulation method for obtaining a combustion simulation part based on a complex part according to claim 1, wherein The said Step 4 includes: The connection parameters include the connection position, connection angle, transition arc length, and curvature between the plate and the bar; The characterization means calculating the average connection position, connection angle, transition arc length, and curvature according to the connection parameters of each group of the plate and the bar with the quantity as the weight.

3. A simulation system for obtaining combustion simulation parts based on complex parts, characterized in that, Including: Module M1: Statistically analyze the shape parameters of the complex part; Module M2: Characterize the complex part as a square flat plate and a cylindrical straight bar; Module M3: Proportionally reduce the area of the characterized plate and the length of the bar; Module M4: Characterize the connection parameters between the plate and the bar in the complex part; Module M5: Connect the proportionally reduced plate and bar with the characterized connection parameters to obtain a combustion simulation part; The shape parameters of the complex part include the volume, thickness, area number of the plate, the cross-sectional area and perimeter, volume, and length of the reinforcing rib or connecting bar, and the connection parameters between the plate and the reinforcing rib or connecting bar; The said Module M2 includes: Module M2.1: Calculate the total volume of the plate in the complex part and the total mid-axis plane area in the thickness direction based on the parameters statistically analyzed in Module M1, and obtain the average thickness by dividing the total volume by the total mid-axis plane area. For the characterized square flat plate, its bottom area is the total mid-axis plane area of the plate in the complex part, and its thickness is the calculated average thickness; Module M2.2: Calculate the total length and total volume of the ribs and connecting bars in the complex part based on the parameters counted in Module M1, and obtain the average cross-sectional area by dividing the total volume by the total length; calculate the cross-sectional dimensions of the characterized columnar straight bar according to the cross-sectional shapes of the ribs and connecting bars in the complex part. Then, for the characterized columnar straight bar, its length is the total length of the ribs and connecting bars in the complex part, its cross-sectional area is the calculated average cross-sectional area, and its cross-sectional dimensions are the calculated cross-sectional dimensions. The said Module M2.2 includes: Module M2.2.1: Calculate the average cross-sectional area S and the average cross-sectional perimeter l of each strip-shaped part in the complex part c , and then calculate the l c / S ratio for each strip; Module M2.2.2: Calculate the average l c / S ratio, and then determine the perimeter of the characterized columnar rectangular bar or round bar in combination with the average cross-sectional area calculated in Module M2.2; Module M2.2.3: Calculate the width and thickness of the columnar rectangular bar or the diameter of the circular bar according to the average cross-sectional area and the calculated perimeter.

4. The simulation system for obtaining a combustion simulation part based on a complex part according to claim 3, wherein, The said Module M4 includes: The said connection parameters include the connection position, connection angle, length of the transition arc and curvature of the plate and the bar. The said characterization means calculating the average connection position, connection angle, length of the transition arc and curvature according to the connection parameters of each group of the plate and the bar with the quantity as the weight.

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