Anti-shaking bottle storage structure design method and anti-shaking bottle storage structure

Abstract

The invention discloses an anti-shaking storage bottle structure design method and an anti-shaking storage bottle structure.The anti-shaking storage bottle structure design method specifically comprises the following steps that a storage bottle three-dimensional model is established; performing structural simulation analysis on the three-dimensional model of the storage bottle to obtain structural stress distribution; performing fluid simulation analysis on the three-dimensional model of the storage bottle to obtain fluid motion parameters; and determining the storage bottle structure according to the structural stress distribution and the fluid motion parameters. According to the method, rapid optimization design of the storage bottle structure can be achieved, and high-cost physical tests in a traditional design method can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of unmanned aerial vehicle fuel storage, and in particular to a design method for an anti-swaying storage bottle structure and an anti-swaying storage bottle structure. Background Art

[0002] In UAV systems using liquid fuel, the liquid fuel in the storage bottle will shake violently when the aircraft takes off, lands, or changes its attitude. This shaking phenomenon will bring about many technical problems: first, the shaking of liquid fuel will cause the center of gravity of the aircraft to change, which will directly affect the flight stability; second, the impact of the liquid will cause repeated loads on the storage bottle structure, causing fatigue damage and reducing the service life of the storage bottle; for cryogenic fuel storage bottles, violent fluid shaking will also cause significant fluctuations in the internal pressure of the sealed storage bottle. Taking liquid hydrogen storage bottles as an example, when electric heating or self-pressurization is used to supply hydrogen, the large fluctuations in the pressure in the bottle will affect the stable supply of hydrogen fuel, which will cause unstable power supply of the fuel cell at the least, and accelerate the performance degradation of the fuel cell at the worst. In addition, during the storage and transportation of cryogenic fuels, excessive shaking will also increase the evaporation loss of liquid fuels.

[0003] Existing anti-sway technologies mainly include three solutions: adding fixed wave-breaking plates inside the storage bottle, installing active or passive damping devices, and using foam filling. These solutions all have obvious shortcomings: adding wave-breaking plates needs to be fixed by welding or jacketing, which not only increases the weight of the storage bottle, but also causes stress concentration at the fixing point, and often requires increasing the wall thickness of the bottle to ensure safety, which ultimately leads to a decrease in the endurance of the drone; the active or passive damping device has a complex structure, which increases the cost and reduces the reliability; although the foam filling solution has a significant effect, it is expensive and it is difficult to find suitable materials for ultra-low temperature environments.

[0004] The current pressure vessel design specifications make it difficult to accurately predict the stress conditions of local structures such as wave-breaking plates and welds, while the method of using strain gauges to measure stress distribution is time-consuming and laborious. Especially for sloshing experiments of cryogenic fluids such as liquid hydrogen, it is very difficult to make observable containers, and the cost of prototyping is high. Therefore, it is urgent to develop an efficient and economical anti-sloshing storage bottle structure design method. Summary of the invention

[0005] The purpose of the present invention is to provide a design method for an anti-swaying storage bottle structure and an anti-swaying storage bottle structure, which can realize rapid optimization design of the storage bottle structure and avoid high-cost physical tests in traditional design methods.

[0006] In order to solve the above technical problems, the present invention provides a method for designing a storage bottle structure to prevent shaking, which specifically includes the following steps:

[0007] Establish a three-dimensional model of the storage bottle;

[0008] Performing structural simulation analysis on the three-dimensional model of the storage bottle to obtain structural stress distribution;

[0009] Performing fluid simulation analysis on the three-dimensional model of the storage bottle to obtain fluid motion parameters; and

[0010] The storage bottle structure is determined according to the structural stress distribution and the fluid motion parameters.

[0011] Furthermore, the structural simulation analysis specifically includes: processing the three-dimensional model of the storage bottle; meshing the processed three-dimensional model of the storage bottle; setting boundary conditions and loading conditions for the meshed three-dimensional model of the storage bottle; performing stress calculation on the set three-dimensional model of the storage bottle; outputting the structural stress distribution result of the storage bottle; judging whether there is stress concentration in the stress distribution result; when there is no stress concentration, performing fatigue analysis on the storage bottle structure; judging whether the safety factor obtained by the fatigue analysis is greater than or equal to a predetermined value, and if so, the performance verification of the storage bottle structure is qualified.

[0012] Furthermore, when stress concentration exists, the three-dimensional model of the storage bottle is returned and modified.

[0013] Further, when the safety factor is less than the predetermined value, the three-dimensional model of the storage bottle is returned to be modified.

[0014] Furthermore, the boundary conditions include internal pressure, temperature load and support constraints.

[0015] Furthermore, the fluid simulation analysis specifically includes the following: pre-processing the three-dimensional model of the storage bottle; performing fluid meshing on the processed three-dimensional model of the storage bottle; setting parameter information for the three-dimensional model of the storage bottle after the fluid meshing; performing non-steady-state working condition calculation on the three-dimensional model of the storage bottle after the setting; post-processing the calculation results to obtain the fluid motion parameters; when the fluid motion parameters do not meet the preset requirements, returning to modify the three-dimensional model of the storage bottle and repeating the above steps.

[0016] Furthermore, the fluid motion parameters include: fluid peak velocity, pressure fluctuation amplitude and mass-weighted average flow rate.

[0017] Furthermore, the mass-weighted average flow rate is calculated according to the following formula:

[0018]

[0019] Where φ is the velocity scalar; ρ is the fluid density; V is the control volume; d is the differential operator; n is the total number of grid cells; i is the grid cell number; |V i | is the volume of the i-th grid cell.

[0020] Furthermore, determining the storage bottle structure according to the structural stress distribution and the fluid motion parameters specifically includes: determining the final storage bottle structure by comparing the structural strength and anti-sway effect of multiple structures.

[0021] In addition, the present invention also proposes an anti-swaying bottle storage structure, which is designed by adopting the anti-swaying bottle storage structure design method as described above, and includes a storage bottle body, a liquid level detection device and a wave-breaking plate;

[0022] A gaseous fuel storage area and a liquid fuel storage area are provided in the storage bottle body; the gaseous fuel storage area is located above the liquid fuel storage area; the wave-breaking plate is arranged in the liquid fuel storage area; the liquid level detection device, a supporting structure and an elastic member are provided on the storage bottle body, the supporting structure is arranged at both ends of the storage bottle body, and the elastic member is arranged on the supporting structure.

[0023] Through the above technical solution, the present invention has the following beneficial effects:

[0024] By establishing a three-dimensional model of the storage bottle; performing structural simulation analysis on the three-dimensional model of the storage bottle to obtain the structural stress distribution; performing fluid simulation analysis on the three-dimensional model of the storage bottle to obtain the fluid motion parameters; and determining the storage bottle structure according to the structural stress distribution and the fluid motion parameters. Therefore, the present invention realizes the rapid optimization design of the storage bottle structure by combining the structural simulation analysis and the fluid simulation analysis. The present invention not only avoids the high-cost physical test in the traditional design method, but also can accurately predict the stress distribution and fluid sloshing characteristics of the storage bottle structure, significantly improving the design efficiency and reliability. At the same time, the safety of the storage bottle structure is ensured through the strict control of the safety factor.

[0025] In addition, the present invention also effectively suppresses the sloshing of liquid fuel by adopting the design of wave-breaking plates, supporting structures and elastic parts, reduces the pressure fluctuation inside the storage bottle, and improves the structural reliability and service life of the storage bottle. Especially for low-temperature fuel storage bottles, the structure can effectively maintain a stable working pressure and ensure a stable supply of fuel, thereby extending the service life of the fuel cell system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of a method for designing a storage bottle structure to prevent shaking in one embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of an anti-swaying bottle storage structure in one embodiment of the present invention;

[0028] Figure 3 It is a flow chart of structural simulation analysis in a method for designing a storage bottle structure for preventing shaking in one embodiment of the present invention;

[0029] Figure 4 It is a flow chart of fluid simulation analysis in a method for designing a storage bottle structure to prevent shaking in one embodiment of the present invention;

[0030] Figure 5 A 3D diagram of a design of a storage bottle structure for preventing shaking in one embodiment of the present invention;

[0031] Figure 6 It is a schematic diagram of an equivalent stress structure of a design of a first embodiment of a method for designing a storage bottle structure for preventing shaking according to an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the safety factor of design one in a method for designing a storage bottle structure to prevent shaking in one embodiment of the present invention;

[0033] Figure 8 It is a 3D diagram of the second design in the anti-swaying storage bottle structure design method in one embodiment of the present invention;

[0034] Fig. 9 It is a schematic diagram of the equivalent stress structure of the second design in the anti-swaying storage bottle structure design method in one embodiment of the present invention;

[0035] Fig.10 It is a schematic diagram of the safety factor of the second design in the design method of the anti-swaying storage bottle structure in one embodiment of the present invention;

[0036] Fig.11 A 3D diagram without a wave-breaking plate is designed in a method for designing a storage bottle structure for preventing swaying in one embodiment of the present invention;

[0037] Fig.12 A schematic diagram of a liquid level at 0 seconds without a wave-breaking plate in a method for designing a storage bottle structure for preventing swaying in one embodiment of the present invention;

[0038] Fig.13 A schematic diagram of a liquid level at 0.5 seconds without a wave-breaking plate in a method for designing a storage bottle structure for preventing swaying in one embodiment of the present invention;

[0039] Fig.14 A schematic diagram of a liquid level at 1 second without a wave-breaking plate in a method for designing a storage bottle structure for preventing swaying in one embodiment of the present invention;

[0040] Fig.15 A schematic diagram of a liquid level at 1.5 seconds without a wave-breaking plate in a method for designing a storage bottle structure for preventing swaying in one embodiment of the present invention;

[0041] Fig.16 A 3D diagram of a wave-breaking plate designed in a method for designing a storage bottle structure to prevent swaying in one embodiment of the present invention;

[0042] Fig.17It is a schematic diagram of the liquid level at 0 seconds when a second wave-breaking plate is designed in the anti-swaying storage bottle structure design method in one embodiment of the present invention;

[0043] Fig.18 It is a schematic diagram of the liquid level at 0.5 seconds when a second wave-breaking plate is designed in the anti-swaying storage bottle structure design method in one embodiment of the present invention;

[0044] Fig.19 It is a schematic diagram of the liquid level at 1 second when a wave-breaking plate is designed in the method for designing a storage bottle structure for preventing sway in one embodiment of the present invention;

[0045] Fig. 20 It is a schematic diagram of the liquid level at 1.5 seconds when a second wave-breaking plate is designed in the anti-swaying storage bottle structure design method in one embodiment of the present invention;

[0046] Fig.21 It is a schematic diagram of the change of the wall force of the design 1 and the design 2 over time in the anti-swaying storage bottle structure design method in one embodiment of the present invention;

[0047] Fig. 22 It is a schematic diagram of the change of the overall mass weighted velocity of Design 1 and Design 2 over time in the anti-sway storage bottle structure design method in one embodiment of the present invention.

[0048] In the figure, 1. storage bottle body; 2. wave-proof material; 3. liquid level detection device; 4. wave-proof plate; 5. gaseous fuel storage area; 6. liquid fuel storage area; 7. supporting structure; 8. elastic member; 9. thermal insulation layer; 10. vacuum layer; 11. liner; 12. outer shell. DETAILED DESCRIPTION

[0049] A design method for an anti-swaying storage bottle structure and an anti-swaying storage bottle structure of the present invention will be described in more detail below in conjunction with the accompanying drawings, wherein preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art may modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation of the present invention.

[0050] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0051] like Figure 1 As shown, the embodiment of the present invention proposes a method for designing a storage bottle structure to prevent shaking, which specifically includes the following steps:

[0052] S1. Establish a three-dimensional model of the storage bottle;

[0053] S2. Performing structural simulation analysis on the three-dimensional model of the storage bottle to obtain structural stress distribution;

[0054] S3, performing fluid simulation analysis on the three-dimensional model of the storage bottle to obtain fluid motion parameters; and

[0055] S4. Determine the storage bottle structure according to the structural stress distribution and the fluid motion parameters.

[0056] In S2, the structural simulation analysis specifically includes: processing the three-dimensional model of the storage bottle; meshing the processed three-dimensional model of the storage bottle; setting boundary conditions and loading conditions for the meshed three-dimensional model of the storage bottle; performing stress calculation on the set three-dimensional model of the storage bottle; outputting the structural stress distribution results of the storage bottle (for example, outputting the overall deformation, safety factor and equivalent stress, etc.); judging whether there is stress concentration in the stress distribution results; when there is no stress concentration, performing fatigue analysis on the storage bottle structure; judging whether the safety factor obtained by the fatigue analysis is greater than or equal to a predetermined value, and if so, the performance verification of the storage bottle structure is qualified.

[0057] Furthermore, when stress concentration exists, the three-dimensional model of the storage bottle is returned and modified.

[0058] Further, when the safety factor is less than the predetermined value, the three-dimensional model of the storage bottle is returned to be modified.

[0059] In one embodiment, the processing of the three-dimensional model of the storage bottle specifically includes: performing geometric processing on the three-dimensional model of the storage bottle, specifying the material of the storage bottle and defining the connection relationship. The geometric processing mainly simplifies the geometry, including processes such as extracting the middle surface; specifying the material for each component and giving detailed material mechanical properties; and defining the connection relationship between the components.

[0060] In one embodiment, the grid division specifically includes: the unit grid size is preferably a predetermined size (eg, 3 mm), and a structured grid is preferably used.

[0061] In this embodiment, the boundary conditions include internal pressure, temperature load and support constraints.

[0062] In one embodiment, the setting of boundary conditions and loading conditions specifically includes: using a distal displacement constraint in the area supporting the liner 11 (i.e., the area where the support structure 7 is located, and the storage bottle body 1 includes the liner 11 and the outer shell 12 arranged outside the liner 11), the distance is equal to the minimum length between the liner 11 and the outer shell 12, and loading a vertical pressure in the area supporting the liner 11. Among them, when the pressure is equal to 100% full of fuel, the total mass of the liner 11 and its accessories multiplied by the friction coefficient between the support structure 7 and the liner 11 multiplied by several times (for example, 10 times) of the acceleration of gravity; loading the maximum design pressure of the liner 11 on the inner surface of the liner 11; loading the hydrostatic pressure on the inner surface of the liner 11 and the wave-breaking board 4; defining the temperature.

[0063] In this embodiment, the stress calculation may use a linear static structural analysis solver.

[0064] In one embodiment, the fatigue analysis of the storage bottle structure, for example, specifically includes: using the SN curve to predict high cycle fatigue strength and safety factor; if the SN curve is a result curve obtained by testing under symmetrical cyclic stress, the Goodman mean stress correction method is required to obtain the fatigue strength under a completely reversed loading of 10 to the nth power (for example, the 7th power) cycle life; the safety factor is obtained by dividing the yield strength of the material by the fatigue strength; if the safety factor is greater than or equal to a predetermined value (for example, 3), the design virtual verification is qualified.

[0065] In S3, the fluid simulation analysis specifically includes the following: pre-processing the three-dimensional model of the storage bottle; performing fluid meshing on the processed three-dimensional model of the storage bottle; setting parameter information for the three-dimensional model of the storage bottle after the fluid meshing; performing non-steady-state working condition calculation on the set three-dimensional model of the storage bottle; post-processing the calculation results to obtain the fluid motion parameters; selecting a storage bottle structure that meets the structural and weight requirements according to the post-processing results; when the fluid motion parameters do not meet the preset requirements, returning to modify the three-dimensional model of the storage bottle and repeating the above steps; and determining a storage bottle structure with a better anti-sway effect through comparative analysis.

[0066] In this embodiment, the parameter information includes fluid model parameters, boundary conditions and solution parameters. Those skilled in the art will appreciate that the parameter information may be set according to actual conditions, including but not limited to the fluid model parameters, boundary conditions and solution parameters described in this embodiment.

[0067] In one embodiment, the fluid motion parameters include: fluid peak velocity, pressure fluctuation amplitude and mass weighted average flow rate. Those skilled in the art will appreciate that the fluid motion parameters can be set according to actual conditions, including but not limited to the fluid peak velocity, pressure fluctuation amplitude and mass weighted average flow rate described in this embodiment.

[0068] Preferably, the mass weighted average flow rate is calculated according to the following formula:

[0069]

[0070] Where φ is the velocity scalar; ρ is the fluid density; V is the control volume; d is the differential operator; n is the total number of grid cells; i is the grid cell number; |V i | is the volume of the i-th grid cell.

[0071] In this embodiment, the pre-processing specifically includes: geometric processing of the three-dimensional model of the storage bottle. The geometric processing mainly simplifies the geometry, including processes such as extracting the center surface; specifying materials for each component and giving detailed material mechanical properties; and defining the connection relationship between components.

[0072] In one embodiment, the fluid grid division specifically includes: the unit grid size is preferably a predetermined size (for example, 3 mm), and a predetermined layer (for example, 2-3 layers) of boundary layers are set on the wall.

[0073] In one embodiment, the parameter setting information specifically includes: specifying the physical properties of the liquid and gas phases of the fuel. Using the VOF multiphase flow model, the VOF model can observe the distribution of the two-phase interface. Using the k-omega turbulence model. Setting the wall boundary condition to be non-free slip. Setting a shaking force of, for example, 0.5g acceleration to be continuously applied to the length direction of the bottle during a predetermined time (for example, 0-0.5 seconds).

[0074] In one embodiment, the non-steady-state operation, for example, defines the liquid level when the tank is filled with 50% of liquid as the initial liquid level. The total simulation time (e.g., 1.5 seconds) is specified, an adaptive solver is used, and the initial step length is set to a set time (e.g., 0.0002 seconds).

[0075] Furthermore, the post-processing of the calculation results specifically includes: arranging pictures of the liquid surface fluctuations at each time step and making animations as the first criterion for characterizing the degree of liquid surface sloshing. Statistical changes in the overall mass-weighted average flow rate of the liquid phase over time as the second criterion for characterizing the degree of liquid phase sloshing. Statistical changes in the force of the liquid phase on the wall over time as the third criterion for characterizing the degree of liquid phase sloshing.

[0076] In S4, determining the storage bottle structure according to the structural stress distribution and the fluid motion parameters specifically includes: determining the final storage bottle structure by comparing the structural strength and anti-sway effect of multiple structures.

[0077] In addition, if Figure 2As shown, this embodiment also proposes an anti-sway bottle storage structure, which is designed using the anti-sway bottle storage structure design method as described above, and includes a storage bottle body 1, a liquid level detection device 3 and a wave-breaking plate 4.

[0078] Specifically, a gaseous fuel storage area 5 and a liquid fuel storage area 6 are provided in the storage bottle body 1; the gaseous fuel storage area 5 is located above the liquid fuel storage area 6; the wave-breaking plate 4 is arranged in the liquid fuel storage area 6; the liquid level detection device 3, a supporting structure 7 and an elastic member 8 are provided on the storage bottle body 1, the supporting structure 7 is arranged at both ends of the storage bottle body 1, and the elastic member 8 is arranged on the supporting structure 7.

[0079] The liquid fuel storage area 6 is used to contain the liquid required in this embodiment, and the liquid surface of the liquid fuel storage area 6 is floated with a wave-proof material 2 (see, for example, Figure 2 The dotted line in the figure is the gas-liquid interface). The gaseous fuel storage area 5 is located above the liquid surface.

[0080] In one embodiment, the liquid level detection device 3 can be selected to be insertable according to actual needs, such as inserted into the liquid fuel storage area 6; or a non-contact type can be selected, such as inserted into the upper part of the storage bottle body 1, and one end of the liquid level detection device 3 can be located in the gaseous fuel storage area 5.

[0081] The storage bottle body 1 has adjacent heat insulation layers 9 and vacuum layers 10; the heat insulation layer 9 is located in the inner circle of the storage bottle body 1, and the vacuum layer 10 is located in the outer circle of the storage bottle body 1. The liquid level gauge, wave-breaking plate 4, gas fuel storage area 5 and liquid fuel storage area 6 are all located in the heat insulation layer 9 (i.e., the inner circle of the storage bottle body 1). One end of the support structure 7 is located in the heat insulation layer 9, and the other end extends to the vacuum layer 10 and is connected to the inner wall of the storage bottle body 1. One end of the elastic member 8 is located in the heat insulation layer 9, and the other end extends to the vacuum layer 10.

[0082] The storage bottle body 1 includes an inner liner 11 and an outer shell 12 disposed outside the inner liner 11. The vacuum layer 10 is located between the outer shell 12 and the inner liner 11, and the heat insulation layer 9 is located between the vacuum layer 10 and the inner liner 11, and the heat insulation layer 9 is closely attached to the outer surface of the inner liner 11. The anti-wave material 2, the liquid level detection device 3 and the anti-wave board 4 are all located in the inner liner 11. The anti-wave board 4 is multiple and connected to the inner wall of the inner liner 11.

[0083] In a specific example, the storage bottle body 1 is a low-temperature fuel storage bottle including a vacuum layer 10. Those skilled in the art will appreciate that the storage bottle body 1 can be selected according to actual conditions.

[0084] In a specific example, this embodiment will use two embodiments to respectively demonstrate the structural simulation analysis and fluid simulation analysis in different situations. For example, for the design and verification of the inner liner 11 and the wave-breaking board 4 of the fuel storage bottle containing the vacuum layer 10, as shown in FIG. Figure 2 The steps of structural simulation analysis (i.e. structural virtual verification) can be as follows: Figure 3 Therefore, the innovations of this step in this embodiment are mainly as follows: first, the method of setting the support constraint conditions; second, if stress concentration occurs, the design must be redesigned and optimized until the stress concentration is eliminated; third, the method of calculating the safety factor and using a value not less than a predetermined threshold (for example, 3) as the standard for verification. The steps of fluid simulation analysis (i.e., fluid virtual verification) can be as follows: Figure 4 As shown. Innovations: First, 0.5g excitation for 0-0.5 seconds; second, three criteria to characterize the degree of sloshing. The definition of mass-weighted average velocity is:

[0085]

[0086] Therefore, in this embodiment, more than two solutions that have passed the structural virtual verification can be designed, and their respective weights can be recorded, and then the fluid virtual verification method can be used to simulate them in order from light to heavy, and the design with the best anti-sway performance can be used as the final solution. As shown in Example 1 and Example 2.

[0087] Embodiment 1

[0088] As shown in Table 1, using the structural virtual verification method, it can be found that Design 1 and Design 2 in Table 1 have stress concentration problems.

[0089] Table 1. Stress conditions of design 1 and design 2

[0090]

[0091]

[0092] As shown in Table 1 and Figure 5-Figure 10 As shown, from the FEA simulation comparison, it can be seen that there is a stress concentration problem on the opening of design one, while there is no stress concentration problem in design two.

[0093] Embodiment 2

[0094] As shown in Table 2, two typical cases can be simulated using CFD software to compare the fluid anti-sloshing performance.

[0095] Table 2. Fluid anti-sloshing detection of Design 1 and Design 2

[0096]

[0097] Recombination Fig.21 and Fig. 22As shown, it can be seen from the comparison of the results that the three criteria for characterizing shaking proposed in this embodiment can clearly distinguish the degree of shaking.

[0098] In summary, the anti-swaying storage bottle structure design method and the anti-swaying storage bottle structure proposed in the present invention have the following advantages:

[0099] By establishing a three-dimensional model of the storage bottle; performing structural simulation analysis on the three-dimensional model of the storage bottle to obtain the structural stress distribution; performing fluid simulation analysis on the three-dimensional model of the storage bottle to obtain the fluid motion parameters; and determining the storage bottle structure according to the structural stress distribution and the fluid motion parameters. Therefore, the present invention realizes the rapid optimization design of the storage bottle structure by combining the structural simulation analysis and the fluid simulation analysis. The present invention not only avoids the high-cost physical test in the traditional design method, but also can accurately predict the stress distribution and fluid sloshing characteristics of the storage bottle structure, significantly improving the design efficiency and reliability. At the same time, the safety of the storage bottle structure is ensured through the strict control of the safety factor.

[0100] In addition, the present invention also effectively suppresses the sloshing of liquid fuel by adopting the design of wave-breaking plates, supporting structures and elastic parts, reduces the pressure fluctuation inside the storage bottle, and improves the structural reliability and service life of the storage bottle. Especially for low-temperature fuel storage bottles, the structure can effectively maintain a stable working pressure and ensure a stable supply of fuel, thereby extending the service life of the fuel cell system.

[0101] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for designing a sway-proof storage bottle structure, characterized in that: The details include: Establish a three-dimensional model of the storage bottle; Performing structural simulation analysis on the three-dimensional model of the storage bottle to obtain structural stress distribution; Performing fluid simulation analysis on the three-dimensional model of the storage bottle to obtain fluid motion parameters; as well as The storage bottle structure is determined according to the structural stress distribution and the fluid motion parameters.

2. The anti-swaying bottle storage structure design method according to claim 1, characterized in that: The structural simulation analysis specifically includes: processing the three-dimensional model of the storage bottle; meshing the processed three-dimensional model of the storage bottle; setting boundary conditions and loading conditions for the meshed three-dimensional model of the storage bottle; performing stress calculation on the set three-dimensional model of the storage bottle; outputting the structural stress distribution result of the storage bottle; judging whether there is stress concentration in the stress distribution result; when there is no stress concentration, performing fatigue analysis on the storage bottle structure; judging whether the safety factor obtained by the fatigue analysis is greater than or equal to a predetermined value, and if so, the performance verification of the storage bottle structure is qualified.

3. The anti-swaying bottle storage structure design method according to claim 2, characterized in that: When stress concentration exists, the three-dimensional model of the storage bottle is modified.

4. The anti-swaying bottle storage structure design method according to claim 2, characterized in that: When the safety factor is less than the predetermined value, the method returns to modify the three-dimensional model of the storage bottle.

5. The anti-swaying bottle storage structure design method according to claim 2, characterized in that: The boundary conditions include internal pressure, temperature load and support constraints.

6. The anti-swaying bottle storage structure design method according to claim 1, characterized in that: The fluid simulation analysis specifically includes the following: pre-processing the three-dimensional model of the storage bottle; performing fluid meshing on the processed three-dimensional model of the storage bottle; setting parameter information for the three-dimensional model of the storage bottle after the fluid meshing; performing non-steady-state working condition calculation on the three-dimensional model of the storage bottle after the setting; post-processing the calculation results to obtain the fluid motion parameters; when the fluid motion parameters do not meet the preset requirements, returning to modify the three-dimensional model of the storage bottle and repeating the above steps.

7. The anti-swaying bottle storage structure design method according to claim 1, characterized in that: The fluid motion parameters include: fluid peak velocity, pressure fluctuation amplitude and mass-weighted average flow velocity.

8. The anti-swaying bottle storage structure design method according to claim 7, characterized in that: The mass-weighted average flow rate is calculated according to the following formula: Where φ is the velocity scalar; ρ is the fluid density; V is the control volume; d is the differential operator; n is the total number of grid cells; i is the grid cell number; |V i | is the volume of the i-th grid cell.

9. The anti-swaying bottle storage structure design method according to claim 1, characterized in that: Determining the storage bottle structure according to the structural stress distribution and the fluid motion parameters specifically includes: determining the final storage bottle structure by comparing the structural strength and anti-sway effect of multiple structures.

10. An anti-sway bottle storage structure, designed by the anti-sway bottle storage structure design method according to any one of claims 1 to 9, characterized in that: It includes a storage bottle body, a liquid level detection device and a wave-breaking plate; A gaseous fuel storage area and a liquid fuel storage area are provided in the storage bottle body; the gaseous fuel storage area is located above the liquid fuel storage area; the wave-breaking plate is arranged in the liquid fuel storage area; the liquid level detection device, a supporting structure and an elastic member are provided on the storage bottle body, the supporting structure is arranged at both ends of the storage bottle body, and the elastic member is arranged on the supporting structure.

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