A method and system for calculating the leakage-induced excitation frequency of a piston ring seal structure

Abstract

The present invention discloses a method and system for calculating the frequency of steam leakage induced excitation of a piston ring sealing structure, which belongs to the field of power machinery and aims to solve the problem that there is no relevant record of the frequency calculation method of steam leakage induced excitation of a piston ring sealing structure in the prior art. Since the piston ring uses its own elasticity to ensure that there is no gap with the corresponding socket when it is cold / hot, sealing is achieved. Therefore, the present invention compares the ratio of the outlet static pressure and the inlet static pressure of the piston ring sealing structure with the critical pressure ratio. If the ratio of the outlet static pressure and the inlet static pressure is less than or equal to the critical pressure ratio, the piston ring seal outlet flow rate is the critical flow rate; if the ratio of the outlet static pressure and the inlet static pressure is greater than the critical pressure ratio, the piston ring seal outlet flow rate is the non-critical flow rate; and then the steam leakage induced excitation frequency is determined according to the critical flow rate and the non-critical flow rate. The method is simple to calculate and the accuracy meets the requirements, filling the gap in the calculation of the piston ring leakage induced excitation frequency.

Description

Technical Field

[0001] The invention belongs to the field of power machinery and relates to a method and a system for calculating the leakage induced excitation frequency of a piston ring sealing structure. Background Art

[0002] The piston ring is a metal elastic ring that is embedded in the piston groove and has a large outward expansion deformation. In cold and hot states, the piston ring uses its own elasticity to ensure that there is no gap with the corresponding socket, thereby achieving sealing. Piston rings are widely used in power machinery such as steam turbines, steam engines, diesel engines, gasoline engines, compressors, hydraulic presses, etc. During the actual operation of mechanical equipment, the piston ring may become stuck and unable to move, or lose its elasticity, further causing the fluid to leak through the gap. The leaked fluid hits and passes over the wall of the adjacent components, generating a shedding vortex and inducing vibration. At present, there is no method to calculate the excitation frequency induced by steam leakage in the piston ring sealing structure. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a method and system for calculating the frequency of steam leakage induced excitation of a piston ring sealing structure, aiming to solve the problem that there is no relevant record in the prior art on the frequency calculation method of steam leakage induced excitation of a piston ring sealing structure.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention proposes a method for calculating the leakage induced excitation frequency of a piston ring sealing structure, comprising the following steps:

[0006] Obtain the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet, and the critical pressure ratio; then compare the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet with the critical pressure ratio to determine whether the piston ring seal outlet flow rate reaches the critical speed;

[0007] If the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is less than or equal to the critical pressure ratio, the piston ring seal outlet flow rate is the critical flow rate; if the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is greater than the critical pressure ratio, the piston ring seal outlet flow rate is the non-critical flow rate;

[0008] The leakage induced vibration frequency of the piston ring seal structure is obtained according to the critical speed or non-critical speed of the piston ring seal outlet flow rate.

[0009] Preferably, the static pressure at the piston ring seal outlet is p z The static pressure at the piston ring seal inlet is p0, and the ratio of the static pressure at the piston ring seal outlet to the static pressure at the piston ring seal inlet is The critical pressure ratio is

[0010] Critical velocity of piston ring seal outlet flow velocity

[0011] Wherein, Z is the number of sealing rings; μ1 is the outlet steam leakage coefficient, K1 is the light inner wall correction coefficient, and ρ0 is the inlet steam density.

[0012] Preferably, the non-critical flow rate of the piston ring seal outlet flow rate is

[0013] Among them, β1 is the leakage ratio.

[0014] Preferably, the expressions of the outlet steam leakage flow coefficient μ1, the light inner wall correction coefficient K1 and the leakage ratio β1 are as shown in formulas (1) to (3):

[0015] μ1=0.6597δ+0.9515 (1)

[0016]

[0017]

[0018] Wherein, δ is the sealing gap width; P is the sealing ring spacing; the expressions of the outlet steam leakage flow coefficient μ1, the light inner wall correction coefficient K1 and the leakage rate ratio β1 shown in formulas (1) to (3) are used to calculate the leakage flow rate of the three-stage piston ring sealing structure.

[0019] Preferably, the expression of the excitation frequency induced by steam leakage of the piston ring sealing structure is as shown in formula (4):

[0020]

[0021] Among them, S is the Strouhal number, which is determined according to the incoming flow direction and the geometric parameters of the impacted wall; U is the free incoming flow velocity, and the free incoming flow velocity U is taken as the critical flow velocity v z,c Or non-critical velocity v z , L is the maximum width of the interface perpendicular to the incoming flow direction.

[0022] Preferably, the sealing ring spacing P is selected according to the piston ring sealing structure.

[0023] The present invention proposes a system for calculating the frequency of steam leakage induced excitation of a piston ring sealing structure, comprising:

[0024] A critical speed judgment module for the flow velocity at the piston ring seal port, wherein the critical speed judgment module is used to obtain the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet, and the critical pressure ratio; and then compare the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet with the critical pressure ratio to judge whether the flow velocity at the piston ring seal outlet reaches the critical speed;

[0025] A module for acquiring a critical flow rate and a non-critical flow rate, wherein the module is used to determine that if the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is less than or equal to the critical pressure ratio, the piston ring seal outlet flow rate is the critical flow rate; if the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is greater than the critical pressure ratio, the piston ring seal outlet flow rate is the non-critical flow rate;

[0026] A module for acquiring the steam leakage induced vibration frequency of a piston ring sealing structure, wherein the module is used to acquire the steam leakage induced vibration frequency of the piston ring sealing structure according to the critical speed or non-critical speed of the piston ring sealing outlet flow rate.

[0027] A computer device comprises a memory and a processor, wherein the memory stores a computer program and the processor implements the steps of a method for calculating the leakage induced excitation frequency of a piston ring sealing structure when executing the computer program.

[0028] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for calculating the leakage-induced excitation frequency of a piston ring sealing structure.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a method for calculating the leakage induced vibration frequency of a piston ring sealing structure. The method combines theoretical deduction and empirical correlation formula for calculation. For the piston ring sealing structure, the ratio of the static pressure at the outlet of the piston ring sealing structure to the static pressure at the inlet of the piston ring sealing structure is compared with the critical pressure ratio. If the ratio of the static pressure at the outlet of the piston ring sealing structure to the static pressure at the inlet of the piston ring sealing structure is less than or equal to the critical pressure ratio, the piston ring seal outlet flow rate is the critical flow rate; if the ratio of the static pressure at the outlet of the piston ring sealing structure to the static pressure at the inlet of the piston ring sealing structure is greater than the critical pressure ratio, the piston ring seal outlet flow rate is the non-critical flow rate; and the leakage induced vibration frequency is determined based on the critical flow rate and the non-critical flow rate. The method for calculating the leakage induced vibration frequency of a piston ring sealing structure proposed by the present invention is simple to operate and easy to implement programmed calculation, and at the same time fills the gap in the calculation method of the airflow excitation frequency induced by piston ring leakage.

[0031] The present invention proposes a system for calculating the leakage induced excitation frequency of a piston ring sealing structure. The system is divided into a critical speed judgment module for the piston ring sealing port flow velocity, a critical flow velocity and non-critical flow velocity acquisition module, and a piston ring sealing structure leakage induced excitation frequency acquisition module. The modular concept is adopted to make each module independent of each other, thereby facilitating unified management of each module. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A flow chart of a method for calculating the steam leakage induced excitation frequency of a piston ring sealing structure according to the present invention;

[0034] Figure 2 A system diagram of the method for calculating the steam leakage induced excitation frequency of a piston ring sealing structure according to the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0042] The present invention proposes a method for calculating the leakage induced vibration frequency of a piston ring seal structure, such as Figure 1 As shown, the following steps are included:

[0043] Obtain the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet, and the critical pressure ratio; then compare the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet with the critical pressure ratio to determine whether the piston ring seal outlet flow rate reaches the critical speed;

[0044] If the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is less than or equal to the critical pressure ratio, the piston ring seal outlet flow rate is the critical flow rate; if the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is greater than the critical pressure ratio, the piston ring seal outlet flow rate is the non-critical flow rate;

[0045] The leakage induced vibration frequency of the piston ring seal structure is obtained according to the critical speed or non-critical speed of the piston ring seal outlet flow rate.

[0046] The present invention proposes a method for calculating the leakage induced excitation frequency of a piston ring sealing structure, which specifically comprises the following steps:

[0047] Calculate the static pressure p at the piston ring seal outlet z The ratio of the static pressure p0 at the inlet of the piston ring seal structure and the critical pressure ratio; then compare the static pressure p0 at the outlet of the piston ring seal structure z Ratio of inlet static pressure p0 to piston ring seal structure Ratio to critical pressure The size of the piston ring seal outlet flow rate can be used to determine whether the piston ring seal outlet flow rate has reached the critical speed;

[0048] when When the gas velocity at the gap outlet of the piston ring seal is the critical velocity v z,c , critical flow rate

[0049] when When the piston ring seal port flow velocity is the non-critical flow velocity v z , non-critical flow rate

[0050] The expressions of outlet steam leakage coefficient μ1, light inner wall correction coefficient K1 and leakage ratio β1 are shown in formula (1) to formula (3):

[0051] μ1=0.6597δ+0.9515 (1)

[0052]

[0053]

[0054] The expression of the excitation frequency induced by steam leakage of the piston ring seal structure is shown in formula (4):

[0055]

[0056] The static pressure at the piston ring seal outlet is p z , unit is kPa; the inlet static pressure of the piston ring seal structure is p0, unit is kPa; the calculation formulas (1) to (3) of the outlet steam leakage flow coefficient μ1, the light inner wall correction coefficient K1 and the leakage rate ratio β1 are applicable to the calculation of the leakage flow rate of the three-stage piston ring seal structure. For other stages of piston ring seals, the fitting formula coefficients are different.

[0057] The leakage steam in the sealing gap will impact the outer wall of the outlet and generate a periodically falling vortex at a certain position downstream of the wall, thereby generating fluid-induced vibration. The expression of the leakage-induced excitation frequency of the piston ring sealing structure is calculated according to formula (4).

[0058] Where Z is the number of sealing rings; μ1 is the outlet steam leakage coefficient, K1 is the light inner wall correction coefficient, and ρ0 is the inlet steam density, in kg / m 3 ; β1 is the leakage ratio, δ is the sealing gap width, in mm; P is the sealing ring spacing, in mm; the expressions of the outlet steam leakage flow coefficient μ1, the light inner wall correction coefficient K1 and the leakage ratio β1 shown in formulas (1) to (3) are only used for the calculation of the leakage flow rate of the three-stage piston ring seal structure. S is the Strouhal number, which is determined according to the incoming flow direction and the geometric parameters of the impacted wall; U is the free incoming flow velocity, in m / s, and the free incoming flow velocity U is taken as the critical flow velocity v z,c Or non-critical velocity v z , L is the maximum width of the interface perpendicular to the incoming flow direction, unit: m.

[0059] The sealing ring spacing P is selected according to the piston ring sealing structure.

[0060] Example:

[0061] The geometric conditions and boundary conditions are as follows: main steam pressure p0 = 15.93 MPa, main steam temperature T0 = 541 °C, seal leakage steam pressure p z =3.47MPa, seal leakage steam temperature T z =335°C; number of sealing rings Z = 3, spacing between sealing rings P = 25mm, thickness of sealing rings Δ = 12.5mm, width of sealing gap δ = 0.5mm; width of the sealing leakage fluid impacting the wall L = 25mm.

[0062] Calculate the static pressure p at the outlet of the sealing structure z The ratio of the static pressure p0 to the inlet pressure, and the ratio p z / p0=0.2178 Compare the size, when the pressure ratio When the gap outlet air velocity is the critical velocity, Calculation: According to the main steam pressure p0 and the main steam temperature T0, the main steam density ρ0 = 47.5 kg / m 3 .

[0063] The outlet steam leakage coefficient μ1, the inner wall correction coefficient K1 and the leakage ratio β1 are calculated according to formula (1) to formula (3) respectively, and the results are μ1≈1.28 and K1≈1.17.

[0064] The calculation formulas (1) to (3) for the outlet steam leakage flow coefficient μ1, the light inner wall correction coefficient K1 and the leakage rate ratio β1 are only applicable to the calculation of the leakage flow rate of the three-stage piston ring seal structure. For other stages of piston ring seals, the fitting formula coefficients are different.

[0065] The leaking steam in the sealing gap will impact the outer wall of the outlet and generate a periodic vortex at a certain position downstream of the wall, thereby generating fluid-induced vibration. The dominant frequency of the vibration can be calculated using formula (4). The value of S is 0.2, and the incoming flow velocity U is calculated based on the critical flow velocity v z,c and non-critical velocity v z The result is U = v z ≈47.8m / s, and the calculated result of the excitation frequency is f s ≈382Hz.

[0066] The present invention proposes a system for calculating the method for the leakage induced vibration frequency of the piston ring seal structure, such as Figure 2 As shown, including:

[0067] A critical speed judgment module for the flow velocity at the piston ring seal port, wherein the critical speed judgment module is used to obtain the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet, and the critical pressure ratio; and then compare the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet with the critical pressure ratio to judge whether the flow velocity at the piston ring seal outlet reaches the critical speed;

[0068] A module for acquiring a critical flow rate and a non-critical flow rate, wherein the module is used to determine that if the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is less than or equal to the critical pressure ratio, the piston ring seal outlet flow rate is the critical flow rate; if the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is greater than the critical pressure ratio, the piston ring seal outlet flow rate is the non-critical flow rate;

[0069] A module for acquiring the steam leakage induced vibration frequency of a piston ring sealing structure, wherein the module is used to acquire the steam leakage induced vibration frequency of the piston ring sealing structure according to the critical speed or non-critical speed of the piston ring sealing outlet flow rate.

[0070] A terminal device provided in one embodiment of the present invention comprises: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0071] The computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to accomplish the present invention.

[0072] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0073] The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0074] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0075] If the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0076] The present invention proposes a method for calculating the leakage-induced vibration frequency of a piston ring sealing structure. The piston ring is a metal elastic ring that is used to be embedded in the piston groove and has a large outward expansion deformation. In the cold and hot states, the piston ring uses its own elasticity to ensure that there is no gap with the corresponding socket, thereby achieving sealing. During the actual operation of the mechanical equipment, the piston ring may become stuck and unable to move, or lose its elasticity, which further causes the fluid to leak through the gap. The leaked fluid hits and passes over the wall of the adjacent component, generating a shedding vortex and inducing vibration. At present, there is no method for calculating the leakage-induced vibration frequency of a piston ring sealing structure. The present invention combines theoretical derivation and empirical formulas to propose a method for calculating the leakage-induced vibration frequency of a piston ring sealing structure. The method of the present invention is simple to calculate, meets the accuracy requirements, and has been verified by engineering examples, filling the gap in the calculation of the leakage-induced vibration frequency of piston rings.

[0077] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for calculating the leakage induced excitation frequency of a piston ring sealing structure, characterized in that: The steps include: Obtain the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet, and the critical pressure ratio; then compare the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet with the critical pressure ratio to determine whether the flow rate at the piston ring seal outlet reaches the critical flow rate; The critical flow rate of the piston ring seal outlet flow rate is: Among them, the static pressure at the outlet of the piston ring seal structure is p z The static pressure at the piston ring seal inlet is p0, and the ratio of the static pressure at the piston ring seal outlet to the static pressure at the piston ring seal inlet is The critical pressure ratio is Z is the number of sealing rings; μ1 is the outlet steam leakage coefficient, K1 is the light inner wall correction coefficient, and ρ0 is the inlet steam density; If the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is less than or equal to the critical pressure ratio, the piston ring seal outlet flow rate is the critical flow rate; if the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is greater than the critical pressure ratio, the piston ring seal outlet flow rate is the non-critical flow rate; Wherein, the critical flow rate of the piston ring seal outlet flow rate is: Among them, the static pressure at the outlet of the piston ring seal structure is p z The static pressure at the piston ring seal inlet is p0, and the ratio of the static pressure at the piston ring seal outlet to the static pressure at the piston ring seal inlet is The critical pressure ratio is Z is the number of sealing rings; μ1 is the outlet steam leakage coefficient, k1 is the light inner wall correction coefficient, and ρ0 is the inlet steam density; The non-critical velocity of the piston ring seal outlet flow velocity is: β1 is the leakage ratio; The leakage induced vibration frequency of the piston ring seal structure is obtained according to the critical flow rate or non-critical flow rate of the piston ring seal outlet flow rate; wherein, the expression of the leakage induced vibration frequency of the piston ring seal structure is: Among them, S is the Strouhal number, which is determined according to the incoming flow direction and the geometric parameters of the impacted wall; U is the free incoming flow velocity, and the free incoming flow velocity U is taken as the critical flow velocity v z,c Or non-critical velocity v z , l is the maximum width of the interface perpendicular to the incoming flow direction.

2. The method for calculating the leakage induced excitation frequency of a piston ring seal structure according to claim 1, characterized in that: The expressions of outlet steam leakage coefficient μ1, light inner wall correction coefficient k1 and leakage ratio β1 are shown in formula (1) to formula (3): μ1=0.6597δ+0.9515 (1) Wherein, δ is the sealing gap width; P is the sealing ring spacing; the expressions of the outlet steam leakage flow coefficient μ1, the light inner wall correction coefficient K1 and the leakage rate ratio β1 shown in formulas (1) to (3) are used to calculate the leakage flow rate of the three-stage piston ring sealing structure.

3. The method for calculating the leakage induced excitation frequency of a piston ring seal structure according to claim 1, characterized in that: The sealing ring spacing P is selected according to the piston ring sealing structure.

4. A system using the method for calculating the leakage induced excitation frequency of a piston ring seal structure according to any one of claims 1 to 3, characterized in that: include: A critical speed judgment module for the flow velocity at the piston ring seal port, wherein the critical speed judgment module is used to obtain the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet, and the critical pressure ratio; and then compare the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet with the critical pressure ratio to judge whether the flow velocity at the piston ring seal outlet reaches the critical flow velocity; A module for acquiring a critical flow rate and a non-critical flow rate, wherein the module is used to determine that if the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is less than or equal to the critical pressure ratio, the piston ring seal outlet flow rate is the critical flow rate; if the ratio of the static pressure at the piston ring seal structure outlet to the static pressure at the piston ring seal structure inlet is greater than the critical pressure ratio, the piston ring seal outlet flow rate is the non-critical flow rate; A module for acquiring the steam leakage induced vibration frequency of a piston ring sealing structure, wherein the module is used to acquire the steam leakage induced vibration frequency of the piston ring sealing structure according to the critical flow rate or non-critical flow rate of the piston ring sealing outlet flow rate.

5. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method for calculating the leakage induced excitation frequency of the piston ring seal structure as described in any one of claims 1 to 4 are implemented.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method for calculating the leakage induced excitation frequency of a piston ring seal structure as claimed in any one of claims 1 to 4 are implemented.

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