Method for evaluating bursting pressure of cylindrical spiral oblique crack of heat transfer pipe

Abstract

The invention particularly relates to a heat transfer pipe cylindrical spiral oblique crack bursting pressure evaluation method, computer equipment and a storage medium, and belongs to the technical field of crack bursting pressure evaluation. The method comprises the following steps: establishing an axial crack bursting pressure evaluation empirical relational expression; establishing a bursting pressure enhancement coefficient relational expression of the cylindrical spiral oblique crack relative to the axial crack; obtaining the size of a cylindrical spiral oblique crack of the to-be-evaluated bursting pressure; calculating the axial crack bursting pressure of the to-be-evaluated cylindrical spiral oblique crack under the same size; calculating a bursting pressure enhancement coefficient of the to-be-evaluated cylindrical spiral oblique crack relative to the axial crack; and multiplying the axial crack bursting pressure by the bursting pressure enhancement coefficient to obtain the bursting pressure of the to-be-evaluated cylindrical spiral oblique crack. The computer equipment and the storage medium are used for implementing the steps of the method. According to the method, cylindrical spiral line oblique crack bursting pressure evaluation is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of steam generator heat transfer tube crack bursting pressure assessment, and in particular to a method, computer equipment and storage medium for assessing the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube. Background Art

[0002] Steam generators, a core component of nuclear power plants, primarily transfer heat between the primary and secondary circuits. Their integrity is crucial to the safe and reliable operation of nuclear power plants. Heat transfer tubes, a key component of steam generators, constitute over 50% of the primary circuit's pressure boundary and are the weak link in the entire steam generator system. If a heat transfer tube ruptures, radioactive coolant could bypass the containment vessel, potentially leading to nuclear radiation leakage. Therefore, preventing heat transfer tube ruptures during nuclear power plant operation is crucial. To prevent heat transfer tube ruptures, a safety assessment of defective heat transfer tubes is essential. Calculating the burst pressure for different defects of varying sizes is the first step in this safety assessment.

[0003] Based on the degradation morphology, heat transfer tube degradation types can be divided into cracks, wear, and pitting. Based on the direction of the cracks, they can be further divided into axial, circumferential, and oblique. Current research on crack burst pressure focuses only on axial and circumferential cracks. However, in actual engineering, cracks may be neither axial nor circumferential, but rather oblique cracks at a certain angle to the axis of the tube. Cylindrical helical oblique cracks are a special form of oblique cracks. Currently, there is no method for assessing the burst pressure of cylindrical helical oblique cracks, and this method cannot provide support for the safety assessment of cylindrical helical oblique cracks. Summary of the Invention

[0004] The purpose of the present invention is to provide a method, computer equipment and storage medium for evaluating the bursting pressure of oblique cracks on a cylindrical spiral line of a heat transfer tube, so as to realize the evaluation of the bursting pressure of oblique cracks on a cylindrical spiral line and provide support for the safety evaluation of oblique cracks on a cylindrical spiral line.

[0005] To achieve the above objectives, the present invention provides, on the one hand, a method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube, comprising the following steps:

[0006] Step 1: Establish an empirical relationship for evaluating the axial crack bursting pressure;

[0007] Step 2: Establish the relationship between the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack and the axial crack;

[0008] Step 3: Obtain the size of the cylindrical spiral oblique crack for the bursting pressure to be evaluated;

[0009] Step 4: Calculate the axial crack bursting pressure of the cylindrical spiral oblique crack with the same size as the one to be evaluated according to the formula in step 1;

[0010] Step 5: Calculate the bursting pressure enhancement coefficient of the spiral oblique crack of the cylinder to be evaluated relative to the axial crack according to the formula in step 2;

[0011] Step 6: Multiply the axial crack bursting pressure obtained in step 4 by the bursting pressure enhancement coefficient obtained in step 5 to obtain the bursting pressure of the cylindrical spiral oblique crack to be evaluated.

[0012] As one of the feasible methods, in step 1, the empirical relationship for evaluating the axial crack burst pressure is:

[0013]

[0014] Among them, P Axi is the axial crack bursting pressure, in MPa; A is a constant, dimensionless; C is a constant, in MPa; S f is the flow pressure in the heat transfer tube, in MPa; L is the axial crack length, in mm; t is the wall thickness of the heat transfer tube, in mm; h is the relative depth of the axial crack, dimensionless; h = H / t; H is the actual depth of the axial crack perpendicular to the wall, in mm; α = t / d; d is the outer diameter of the heat transfer tube, in mm.

[0015] As one possible implementation method, step 2 is to establish a relationship between the bursting pressure enhancement coefficient of a cylindrical spiral oblique crack and an axial crack, including the following steps:

[0016] Step 201: Perform bursting pressure tests on the cylindrical oblique spiral crack and the axial crack, respectively, to obtain bursting pressure test data for the cylindrical oblique spiral crack. The bursting pressure test data for the cylindrical oblique spiral crack includes the angle of the cylindrical oblique spiral crack and the bursting pressure enhancement coefficient of the cylindrical oblique spiral crack relative to the axial crack. The bursting pressure enhancement coefficient of the cylindrical oblique spiral crack relative to the axial crack = bursting pressure of the cylindrical oblique spiral crack / bursting pressure of the axial crack.

[0017] Step 202: Using the angle of the cylindrical spiral oblique crack as the abscissa and the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack relative to the axial crack as the ordinate, a least squares method is used to fit the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack, thereby minimizing the residual sum of squares between the bursting pressure test data of the cylindrical spiral oblique crack and the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack, and determining the optimal fitting parameters of the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack;

[0018] Step 203: Substitute the best fitting parameters of the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack into the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack to obtain the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack.

[0019] As one possible implementation method, the best fitting parameters of the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack in steps 202 and 203 are a1, a2 and a3;

[0020] The relationship between the bursting pressure enhancement coefficient of a cylindrical spiral oblique crack and an axial crack is:

[0021] f C-L (θ)=a1θ 2 +a2θ+a3

[0022] Among them, f C-L (θ) is the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack relative to the axial crack; θ is the angle of the cylindrical spiral oblique crack, β<θ≤90°, and β is the starting angle of the cylindrical spiral oblique crack.

[0023] As one possible implementation, in step 201, the angle of the cylindrical spiral oblique crack is the angle between the tangent line of the cylindrical spiral oblique crack and the axial direction of the heat transfer tube;

[0024] The bursting pressure test was carried out on cylindrical spiral oblique cracks with angles of 10°, 15°, 30°, 45°, 60°, 75° and 90° to obtain the bursting pressure of cylindrical spiral oblique cracks;

[0025] The cylindrical spiral oblique crack with an angle of 0° is an axial crack; a bursting pressure test is performed on the axial crack to obtain the axial crack bursting pressure.

[0026] As one of the feasible methods, in step 201, in the bursting pressure test of the cylindrical spiral oblique crack, the size of the cylindrical spiral oblique crack specimen is limited as follows: the arc of the cylindrical spiral oblique crack projected on the axial direction of the heat transfer tube does not exceed π / 4, the length of the cylindrical spiral oblique crack is 10 mm, the width of the cylindrical spiral oblique crack is 0.1 mm, and the relative depth of the cylindrical spiral oblique crack is 40%.

[0027] As one possible implementation, in step 3, the size of the cylindrical spiral oblique crack to be evaluated includes the length, angle, and relative depth of the cylindrical spiral oblique crack to be evaluated, as well as the flow pressure, wall thickness, and outer diameter of the heat transfer tube;

[0028] The starting angle of the spiral oblique crack of the cylinder to be evaluated is less than the angle of the spiral oblique crack of the cylinder to be evaluated ≤ 90°;

[0029] To be evaluated d is the outer diameter of the heat transfer tube, in mm; θ is the angle of the spiral oblique crack of the cylinder to be evaluated.

[0030] In order to achieve the above-mentioned purpose, in a second aspect, the present invention provides a computer device comprising a memory and a processor, wherein the memory stores computer-readable instructions, and when the processor executes the computer-readable instructions, the steps of the above-mentioned method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube are implemented.

[0031] In order to achieve the above-mentioned purpose, in a third aspect, the present invention provides a computer-readable storage medium having computer-readable instructions stored thereon, which, when executed, implement the steps of the above-mentioned method for evaluating the bursting pressure of cylindrical spiral oblique cracks in heat transfer tubes.

[0032] Beneficial technical effects of the present invention:

[0033] The method, computer equipment and storage medium for evaluating the bursting pressure of cylindrical spiral oblique cracks in heat transfer tubes of the present invention establish an empirical relationship for evaluating the bursting pressure of axial cracks; a relationship for the bursting pressure enhancement coefficient of cylindrical spiral oblique cracks relative to axial cracks is constructed through bursting pressure tests of cylindrical spiral oblique cracks and axial cracks; the size parameters of the cylindrical spiral oblique crack to be evaluated are substituted into the empirical relationship for evaluating the bursting pressure of axial cracks to obtain the bursting pressure of axial cracks at the same size as the cylindrical spiral oblique crack to be evaluated; the size parameters of the cylindrical spiral oblique crack to be evaluated are substituted into the relationship for the bursting pressure enhancement coefficient of cylindrical spiral oblique cracks relative to axial cracks to obtain the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack to be evaluated relative to the axial crack; the bursting pressure of the cylindrical spiral oblique crack to be evaluated at the same size as the cylindrical spiral oblique crack to be evaluated is multiplied by the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack to be evaluated relative to the axial crack to obtain the bursting pressure of the cylindrical spiral oblique crack to be evaluated, providing data support for subsequent safety evaluation of cylindrical spiral oblique cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a flow chart of an embodiment of a method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube according to the present invention;

[0035] Figure 2 Schematic diagram of the angle of the cylindrical spiral oblique crack;

[0036] Figure 3 is the relationship between the bursting pressure enhancement coefficient of cylindrical spiral oblique crack and axial crack fitted by the bursting pressure test of cylindrical spiral oblique crack and axial crack;

[0037] Figure 4 Schematic diagram of cylindrical spiral oblique crack;

[0038] Figure 5 for Figure 4 Schematic diagram of the angle of the spiral oblique crack in the medium cylinder. DETAILED DESCRIPTION

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] The technical solution of the present invention is described clearly and completely below with reference to the accompanying drawings and specific embodiments.

[0042] refer to Figure 1 , a flow chart of an embodiment of a method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube is shown. The method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube comprises the following steps:

[0043] Step 1: Establish an empirical relationship for evaluating the axial crack bursting pressure;

[0044] Step 2: Establish the relationship between the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack and the axial crack;

[0045] Step 3: Obtain the size of the cylindrical spiral oblique crack for the bursting pressure to be evaluated;

[0046] Step 4: Calculate the axial crack bursting pressure of the cylindrical spiral oblique crack with the same size as the one to be evaluated according to the formula in step 1;

[0047] Step 5: Calculate the bursting pressure enhancement coefficient of the spiral oblique crack of the cylinder to be evaluated relative to the axial crack according to the formula in step 2;

[0048] Step 6: Multiply the axial crack bursting pressure obtained in step 4 by the bursting pressure enhancement coefficient obtained in step 5 to obtain the bursting pressure of the cylindrical spiral oblique crack to be evaluated.

[0049] In this embodiment, as one of the feasible methods, in step 1, the empirical relationship for evaluating the axial crack bursting pressure is:

[0050]

[0051] Among them, P Axi is the axial crack bursting pressure, in MPa; A is a constant, dimensionless; C is a constant, in MPa; S f is the flow pressure in the heat transfer tube, in MPa; L is the axial crack length, in mm; t is the wall thickness of the heat transfer tube, in mm; h is the relative depth of the axial crack, dimensionless; h = H / t; H is the actual depth of the axial crack perpendicular to the wall, in mm; α = t / d; d is the outer diameter of the heat transfer tube, in mm.

[0052] See also Figure 3 In this embodiment, as one of the possible implementation methods, step 2 is to establish a relationship between the bursting pressure enhancement coefficient of a cylindrical spiral oblique crack and an axial crack, including the following steps:

[0053] Step 201: Perform bursting pressure tests on the cylindrical oblique spiral crack and the axial crack, respectively, to obtain bursting pressure test data for the cylindrical oblique spiral crack. The bursting pressure test data for the cylindrical oblique spiral crack includes the angle of the cylindrical oblique spiral crack and the bursting pressure enhancement coefficient of the cylindrical oblique spiral crack relative to the axial crack. The bursting pressure enhancement coefficient of the cylindrical oblique spiral crack relative to the axial crack = bursting pressure of the cylindrical oblique spiral crack / bursting pressure of the axial crack.

[0054] Step 202: Using the angle of the cylindrical spiral oblique crack as the abscissa and the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack relative to the axial crack as the ordinate, a least squares method is used to fit the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack, thereby minimizing the residual sum of squares between the bursting pressure test data of the cylindrical spiral oblique crack and the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack, and determining the optimal fitting parameters of the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack;

[0055] Step 203: Substitute the best fitting parameters of the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack into the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack to obtain the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack.

[0056] In this embodiment, as one of the possible implementations, the best fitting parameters of the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack in steps 202 and 203 are a1, a2, and a3;

[0057] The relationship between the bursting pressure enhancement coefficient of a cylindrical spiral oblique crack and an axial crack is:

[0058] fC-L (θ)=a1θ 2 +a2θ+a3

[0059] Among them, f C-L (θ) is the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack relative to the axial crack; θ is the angle of the cylindrical spiral oblique crack, β<θ≤90°, and β is the starting angle of the cylindrical spiral oblique crack.

[0060] See also Figure 2 In this embodiment, as one of the possible implementation methods, in step 201, the angle of the cylindrical spiral oblique crack is the angle between the tangent line of the cylindrical spiral oblique crack and the axial direction of the heat transfer tube;

[0061] The bursting pressure test was carried out on cylindrical spiral oblique cracks with angles of 10°, 15°, 30°, 45°, 60°, 75° and 90° to obtain the bursting pressure of cylindrical spiral oblique cracks;

[0062] The cylindrical spiral oblique crack with an angle of 0° is an axial crack; a bursting pressure test is performed on the axial crack to obtain the axial crack bursting pressure.

[0063] In this embodiment, as one of the feasible methods, in step 201, in the cylindrical spiral oblique crack bursting pressure test, the size of the cylindrical spiral oblique crack specimen is limited as follows: the arc of the cylindrical spiral oblique crack projected on the axial direction of the heat transfer tube does not exceed π / 4, the length of the cylindrical spiral oblique crack is 10 mm, the width of the cylindrical spiral oblique crack is 0.1 mm, and the relative depth of the cylindrical spiral oblique crack is 40%.

[0064] In this embodiment, as one possible implementation method, in step 3, the size of the cylindrical spiral oblique crack to be evaluated includes the length, angle, and relative depth of the cylindrical spiral oblique crack to be evaluated, as well as the flow pressure, wall thickness, and outer diameter of the heat transfer tube;

[0065] The starting angle of the spiral oblique crack of the cylinder to be evaluated is less than the angle of the spiral oblique crack of the cylinder to be evaluated ≤ 90°;

[0066] To be evaluated d is the outer diameter of the heat transfer tube, in mm; θ is the angle of the spiral oblique crack of the cylinder to be evaluated.

[0067] As an implementation of the above method, the present invention provides an embodiment of a computer device, which corresponds to the embodiment of the above method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube.

[0068] The computer device described in this embodiment includes a memory, a processor, and a network interface that are interconnected via a system bus. It should be noted that this embodiment only shows a computer device having a memory, a processor, and a network interface, but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead. Among them, those skilled in the art will understand that the computer device here is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to a microprocessor, an application-specific integrated circuit, a programmable gate array, a digital processor, an embedded device, etc.

[0069] The computer device may be a desktop computer, notebook computer, PDA, cloud server, etc. The computer device may interact with the user via a keyboard, mouse, remote control, touchpad, or voice control device.

[0070] The memory includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory, random access memory, static random access memory, read-only memory, electrically erasable programmable read-only memory, programmable read-only memory, magnetic storage, magnetic disk, optical disk, etc. In some embodiments, the memory may be an internal storage unit of the computer device, such as the computer device's hard disk or internal memory. In other embodiments, the memory may also be an external storage device of the computer device, such as a plug-in hard disk, smart memory card, secure digital card, flash memory card, etc. Of course, the memory may also include both the internal storage unit and external storage devices of the computer device. In this embodiment, the memory is typically used to store the operating system and various application software installed on the computer device, such as the computer-readable instructions for the aforementioned method for assessing the bursting pressure of spiral oblique cracks in a heat transfer tube cylinder. In addition, the memory may also be used to temporarily store various types of data that have been output or are about to be output.

[0071] In some embodiments, the processor may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip. This processor is typically used to control the overall operation of the computer device. In this embodiment, the processor is used to execute computer-readable instructions or process data stored in the memory, such as executing the computer-readable instructions for the aforementioned method for evaluating the burst pressure of a cylindrical spiral oblique crack in a heat transfer tube.

[0072] The network interface may include a wireless network interface or a wired network interface, which is generally used to establish a communication connection between the computer device and other electronic devices.

[0073] As an implementation of the above method, the present invention provides an embodiment of a computer-readable storage medium, which corresponds to the embodiment of the above method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube.

[0074] The computer-readable storage medium described in this embodiment stores computer-readable instructions, and the computer-readable instructions can be executed by at least one processor to enable the at least one processor to perform the steps of the above-mentioned method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube.

[0075] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube, characterized in that: The steps include: Step 1: Establish an empirical relationship for evaluating the axial crack bursting pressure; Step 2: Establish the relationship between the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack and the axial crack; Step 3: Obtain the size of the cylindrical spiral oblique crack for the bursting pressure to be evaluated; Step 4: Calculate the axial crack bursting pressure of the cylindrical spiral oblique crack with the same size as the one to be evaluated according to the formula in step 1; Step 5: Calculate the bursting pressure enhancement coefficient of the spiral oblique crack of the cylinder to be evaluated relative to the axial crack according to the formula in step 2; Step 6: Multiply the axial crack bursting pressure obtained in step 4 by the bursting pressure enhancement coefficient obtained in step 5 to obtain the bursting pressure of the cylindrical spiral oblique crack to be evaluated.

2. The method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube according to claim 1, characterized in that: In step 1, the empirical relationship for evaluating the axial crack burst pressure is: Among them, P Axi is the axial crack bursting pressure, in MPa; A is a constant, dimensionless; C is a constant, in MPa; S f is the flow pressure in the heat transfer tube, in MPa; L is the axial crack length, in mm; t is the wall thickness of the heat transfer tube, in mm; h is the relative depth of the axial crack, dimensionless; h = H / t; H is the actual depth of the axial crack perpendicular to the wall, in mm; α = t / d; d is the outer diameter of the heat transfer tube, in mm.

3. The method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube according to claim 1, characterized in that: Step 2: Establishing the burst pressure enhancement coefficient relationship between the cylindrical spiral oblique crack and the axial crack, including the following steps: Step 201: Perform bursting pressure tests on the cylindrical oblique spiral crack and the axial crack, respectively, to obtain bursting pressure test data for the cylindrical oblique spiral crack. The bursting pressure test data for the cylindrical oblique spiral crack includes the angle of the cylindrical oblique spiral crack and the bursting pressure enhancement coefficient of the cylindrical oblique spiral crack relative to the axial crack. The bursting pressure enhancement coefficient of the cylindrical oblique spiral crack relative to the axial crack = bursting pressure of the cylindrical oblique spiral crack / bursting pressure of the axial crack. Step 202: Using the angle of the cylindrical spiral oblique crack as the abscissa and the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack relative to the axial crack as the ordinate, a least squares method is used to fit the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack, thereby minimizing the residual sum of squares between the bursting pressure test data of the cylindrical spiral crack and the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack, and determining the optimal fitting parameters of the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack; Step 203: Substitute the best fitting parameters of the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack into the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack to obtain the bursting pressure enhancement coefficient relationship of the cylindrical spiral oblique crack relative to the axial crack.

4. The method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube according to claim 3, characterized in that: The best fitting parameters of the bursting pressure enhancement coefficient expression of the cylindrical spiral oblique crack relative to the axial crack in steps 202 and 203 are a1, a2 and a3; The relationship between the bursting pressure enhancement coefficient of a cylindrical spiral oblique crack and an axial crack is: f C-L (θ)=a1θ 2 +a2θ+a3 Among them, f C-L (θ) is the bursting pressure enhancement coefficient of the cylindrical spiral oblique crack relative to the axial crack; θ is the angle of the cylindrical spiral oblique crack, β<θ≤90°, and β is the starting angle of the cylindrical spiral oblique crack.

5. The method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube according to claim 3, characterized in that: In step 201, the angle of the cylindrical spiral oblique crack is the angle between the tangent line of the cylindrical spiral oblique crack and the axial direction of the heat transfer tube; The bursting pressure test was carried out on cylindrical spiral oblique cracks with angles of 10°, 15°, 30°, 45°, 60°, 75° and 90° to obtain the bursting pressure of cylindrical spiral oblique cracks; The cylindrical spiral oblique crack with an angle of 0° is an axial crack; a bursting pressure test is performed on the axial crack to obtain the axial crack bursting pressure.

6. The method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube according to claim 3, characterized in that: In step 201, during the bursting pressure test of the cylindrical spiral oblique crack, the size of the cylindrical spiral oblique crack specimen is limited as follows: the arc of the cylindrical spiral oblique crack projected on the axial direction of the heat transfer tube does not exceed π / 4, the length of the cylindrical spiral oblique crack is 10 mm, the width of the cylindrical spiral oblique crack is 0.1 mm, and the relative depth of the cylindrical spiral oblique crack is 40%.

7. The method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube according to claim 1, characterized in that: In step 3, the dimensions of the cylindrical spiral oblique crack to be evaluated include the length, angle, and relative depth of the cylindrical spiral oblique crack to be evaluated, as well as the flow pressure, wall thickness, and outer diameter of the heat transfer tube; The starting angle of the spiral oblique crack of the cylinder to be evaluated is less than the angle of the spiral oblique crack of the cylinder to be evaluated ≤ 90°; d is the outer diameter of the heat transfer tube, in mm; θ is the angle of the spiral oblique crack of the cylinder to be evaluated.

8. A computer device comprising a memory and a processor, wherein the memory stores computer-readable instructions, wherein: When the processor executes the computer-readable instructions, the steps of the method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube according to any one of claims 1 to 7 are implemented.

9. A computer-readable storage medium having computer-readable instructions stored thereon, characterized in that: When the computer-readable instructions are executed, the steps of the method for evaluating the bursting pressure of a cylindrical spiral oblique crack in a heat transfer tube according to any one of claims 1 to 7 are implemented.

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