Flow characteristic simulation method and device for ship water supply emptying valve

Abstract

The invention provides a flow characteristic simulation method and device for a ship water supply emptying valve, and is applied to the technical field of ship fluid system design and simulation. The method comprises the steps that a valve-pipe coupling model is built, fluid operation parameters of the valve-pipe coupling model are determined, and the valve-pipe coupling model comprises an air exhaust valve body, an upstream water main pipe of the air exhaust valve body and a downstream boiler connecting pipe; the stress of the valve clack is calculated in real time by constructing a six-degree-of-freedom dynamic model, and the spatial position and posture of the valve clack in each time step length are solved and updated based on the stress of the valve clack; according to the spatial position and posture of the valve clack, a dynamic grid technology is adopted to conduct self-adaptive adjustment on a computational domain so as to process flow field boundary changes caused by movement of the valve clack; and based on the adjusted computational domain, combining a preset turbulence model and a multi-phase flow model to solve a fluid control equation so as to obtain flow field distribution, pressure change and a gas-liquid two-phase interface evolution rule in the emptying valve.

Description

Technical Field

[0001] This invention relates to the field of ship fluid system design and simulation technology, and in particular to a method and apparatus for simulating the flow characteristics of a ship's water supply and air vent valve. Background Technology

[0002] The ship's feedwater vent check valve is a critical safety valve that integrates check, shut-off, and venting functions. It prevents backflow of high-pressure media from the boiler through a main check valve, while its bypass and venting designs drain water from the pipeline, thus achieving multiple purposes such as protecting the feedwater pump, preventing water hammer, and enabling light-load startup. It is an indispensable piece of equipment for ensuring the safe, stable, and long-term operation of the ship's propulsion system.

[0003] In existing technologies, the performance analysis of vent check valves mainly adopts two types of schemes: one is the empirical design and experimental verification scheme, which involves first completing the preliminary design based on the design manual and empirical formulas, then manufacturing a physical prototype, and obtaining key performance parameters such as flow-pressure differential curves and sealing performance through test bench testing; the other is the conventional computational fluid dynamics (CFD) simulation scheme, which uses general CFD software to construct a three-dimensional model of the valve flow channel, and combines standard turbulence models and dynamic mesh technology to simulate and analyze the valve disc opening and closing process.

[0004] However, both of the above-mentioned schemes have obvious drawbacks: for the empirical design and experimental verification scheme, not only is the design cycle long and the experimental cost high, but it is also impossible to obtain detailed information on the internal flow field of the valve, making it difficult to support in-depth performance optimization; for the conventional CFD simulation scheme, since the air vent valve is isolated from the system for research and simplified motion laws are used to simulate the valve disc motion, the simulation results are of low accuracy and cannot meet the actual needs of high-precision performance analysis of the air vent check valve. Summary of the Invention

[0005] This invention provides a method and apparatus for simulating the flow characteristics of a ship's water supply air drain valve, which solves the problem of low simulation accuracy in the prior art. It can achieve high-precision simulation of the air drain check valve, accurately reveal its complex flow mechanism, provide reliable support for valve optimization design, and improve analysis efficiency.

[0006] This invention provides a simulation method for the flow characteristics of a ship's feedwater vent valve, comprising: constructing a valve-pipe coupling model and determining the fluid operation parameters of the valve-pipe coupling model, wherein the valve-pipe coupling model includes the vent valve body, the upstream sluice pipe of the vent valve body, and the downstream boiler connection pipe; calculating the valve disc force in real time by constructing a six-degree-of-freedom dynamic model, and solving and updating the spatial position and attitude of the valve disc at each time step based on the valve disc force; adaptively adjusting the computational domain using dynamic mesh technology according to the spatial position and attitude of the valve disc to handle the flow field boundary changes caused by the valve disc movement; and solving the fluid control equations based on the adjusted computational domain, combined with a preset turbulence model and a multiphase flow model, to obtain the flow field distribution, pressure changes, and gas-liquid two-phase interface evolution law inside the vent valve.

[0007] According to the present invention, a simulation method for the flow characteristics of a ship feedwater vent valve is provided. The step of determining the fluid operating parameters of the valve-pipe coupling model includes: setting the inlet to a mass flow rate inlet or a velocity inlet and inputting time-varying data determined by the feedwater pump performance curve; setting the outlet to a pressure outlet with a pressure value determined based on the boiler operating conditions; and setting the vent outlet to a pressure outlet based on atmospheric pressure or engine room ambient pressure.

[0008] According to the present invention, a simulation method for the flow characteristics of a ship's water supply and air vent valve is provided, wherein the valve disc is subjected to forces including fluid pressure, viscous force, its own weight, spring preload, spring deformation force, and frictional torque at the valve shaft hinge.

[0009] According to the present invention, a method for simulating the flow characteristics of a ship's water supply and air discharge valve is provided. The method of adaptively adjusting the computational domain using dynamic mesh technology includes: using a combination of elastic smoothing and local reconstruction methods, when the valve disc movement causes local mesh deformation to exceed a preset threshold, the mesh of the corresponding region is re-divided.

[0010] According to the present invention, a simulation method for the flow characteristics of a ship's feedwater vent valve is provided. Before solving the fluid control equation, the method further includes: when there is a risk of cavitation in the simulation condition, activating a preset cavitation model.

[0011] According to the present invention, a simulation method for the flow characteristics of a ship's feedwater vent valve is provided. After solving the fluid control equation, the method further includes: extracting macroscopic parameters and analyzing the streamline diagram, pressure cloud diagram, velocity vector diagram and cavitation region distribution inside the vent valve. The macroscopic parameters include the flow coefficient, flow resistance coefficient and valve disc opening and closing time.

[0012] This invention also provides a simulation device for the flow characteristics of a ship's feedwater vent valve, comprising the following modules: a construction module, a processing module, and a solution module; the construction module is used to construct a valve-pipe coupling model and determine the fluid operation parameters of the valve-pipe coupling model, the valve-pipe coupling model including the vent valve body, the upstream sluice pipe of the vent valve body, and the downstream boiler connection pipe; the valve disc force is calculated in real time by constructing a six-degree-of-freedom dynamic model, and the spatial position and attitude of the valve disc are solved and updated at each time step based on the valve disc force; the processing module is used to adaptively adjust the computational domain according to the spatial position and attitude of the valve disc using dynamic mesh technology to handle the flow field boundary changes caused by the valve disc movement; the solution module is used to solve the fluid control equations based on the adjusted computational domain, combined with a preset turbulence model and multiphase flow model, to obtain the flow field distribution, pressure changes, and gas-liquid two-phase interface evolution law inside the vent valve.

[0013] According to the present invention, a simulation device for the flow characteristics of a ship feedwater vent valve is provided. The step of determining the fluid operating parameters of the valve-pipe coupling model includes: setting the inlet to a mass flow rate inlet or a velocity inlet and inputting time-varying data determined by the feedwater pump performance curve; setting the outlet to a pressure outlet with a pressure value determined based on the boiler operating conditions; and setting the vent outlet to a pressure outlet based on atmospheric pressure or engine room ambient pressure.

[0014] According to the present invention, a simulation device for the flow characteristics of a ship's water supply and air vent valve is provided, wherein the valve disc is subjected to forces including fluid pressure, viscous force, its own weight, spring preload, spring deformation force, and frictional torque at the valve shaft hinge.

[0015] According to the present invention, a simulation device for the flow characteristics of a ship's water supply and air discharge valve is provided. The method of adaptively adjusting the computational domain using dynamic mesh technology includes: using a combination of elastic smoothing and local reconstruction methods, when the movement of the valve disc causes the local mesh deformation to exceed a preset threshold, the mesh of the corresponding region is re-divided.

[0016] According to the present invention, a simulation device for the flow characteristics of a ship's feedwater vent valve is provided. Before solving the fluid control equation, the processing module is further configured to activate a preset cavitation model when there is a risk of cavitation in the simulation condition.

[0017] According to the present invention, a simulation device for the flow characteristics of a ship's feedwater vent valve is provided. After solving the fluid control equation, the solution module is used to extract macroscopic parameters and analyze the streamline diagram, pressure cloud diagram, velocity vector diagram and cavitation region distribution inside the vent valve. The macroscopic parameters include the flow coefficient, flow resistance coefficient and valve disc opening and closing time.

[0018] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the flow characteristic simulation method of the ship's water supply and air discharge valve as described above.

[0019] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the flow characteristic simulation method for ship feedwater discharge valves as described above.

[0020] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the flow characteristic simulation method for a ship feedwater discharge valve as described above.

[0021] The simulation method and apparatus for the flow characteristics of ship feedwater vent valves provided by this invention, by constructing a valve-pipe coupling model including the vent valve body, upstream sluice pipe, and downstream boiler connection pipe and determining the corresponding fluid operating parameters, can fully consider the coupling effect between the pipeline system and the vent valve, avoiding the boundary condition distortion problem caused by the isolated analysis of valves in conventional simulations, and making the simulation environment closer to engineering reality; by calculating the valve disc force in real time and updating its spatial position and attitude through a six-degree-of-freedom dynamic model, abandoning the traditional simplified motion law, it can accurately reproduce the complex dynamic response of the valve disc under the combined action of real hydraulic impact, gravity, spring force, and hinge friction, solving the defect of inaccurate valve disc motion simulation in conventional simulations; by adopting dynamic mesh technology to adaptively adjust the computational domain and solving the fluid control equations by combining a preset turbulence model and a multiphase flow model, it can effectively handle the mesh distortion caused by valve disc motion, accurately capture the complex flow field, pressure changes, and gas-liquid two-phase interface evolution law inside the valve, and make up for the lack of detailed flow field information obtained by empirical design and conventional simulation. This significantly improves the accuracy and comprehensiveness of the simulation of the flow characteristics of the air vent valve, enabling in-depth performance optimization of the valve without relying on high-cost physical prototype testing, while also improving analysis efficiency and providing reliable technical support for the safe and stable operation of the ship's power system. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is one of the flowcharts illustrating the simulation method for the flow characteristics of a ship's water supply air drain valve provided by the present invention; Figure 2This is the second flowchart illustrating the simulation method for the flow characteristics of the ship's water supply air drain valve provided by this invention. Figure 3 This is a schematic diagram of the flow characteristic simulation device for the ship water supply air drain valve provided by the present invention; Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that in the embodiments of this application, the words "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0026] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0027] To facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish the same or similar items with essentially the same function and effect. Those skilled in the art can understand that the terms "first" and "second" are not intended to limit the quantity or execution order.

[0028] This application describes some exemplary embodiments for illustrative purposes. It should be understood that this application may be implemented in other ways not specifically shown in the accompanying drawings.

[0029] like Figure 1-2 As shown, this application embodiment provides a method for simulating the flow characteristics of a ship's feedwater empty valve. This method can be applied to a flow characteristic simulation device for ship's feedwater empty valve. The method may include steps S101-S104: S101. A simulation device for the flow characteristics of a ship's water supply and air vent valve is used to construct a valve-pipe coupling model and determine the fluid operation parameters of the valve-pipe coupling model.

[0030] The valve-pipe coupling model described above includes the air vent valve body, the upstream header pipe of the air vent valve body, and the downstream boiler connection pipe. The air vent valve body includes a valve body, valve disc, valve seat, valve shaft, and bypass pipe.

[0031] The valve-pipe coupling model is based on the actual operation scenario of the ship's water supply system. As a key component connecting the upstream water supply header and the downstream boiler, the ship's water supply air vent valve is inevitably affected by the fluid state of the upstream and downstream pipelines. An isolated valve model cannot reproduce the real flow field environment. Therefore, the air vent valve body can be integrated with the upstream and downstream pipelines through integrated modeling to form a complete fluid domain system.

[0032] Optionally, the construction of the valve-pipe coupling model includes: using 3D modeling technology to accurately reconstruct the geometry of each core component of the air vent valve body, ensuring that structural parameters such as the sealing surface shape of the valve disc and valve seat, the installation position of the valve shaft, the direction and diameter of the bypass pipeline are consistent with the actual valve. At the same time, according to the actual pipeline layout of the ship's water supply system, a section of the upstream water supply header and the downstream boiler connection pipe connected to the air vent valve are cut out, and the pipeline is seamlessly connected to the air vent valve body to ensure the continuity of the fluid domain. In the modeling process, geometric accuracy and computational efficiency must be considered. Key areas such as the internal flow channel of the valve are modeled in detail, and non-critical areas of the pipeline are appropriately simplified to avoid redundant meshes that increase computational costs. Finally, a 3D model that can accurately reflect the overall fluid channel characteristics of the "valve-pipe" is formed.

[0033] Optionally, determining the fluid operating parameters of the valve-pipe coupling model includes: setting the inlet to a mass flow rate inlet or a velocity inlet, and inputting time-varying data determined by the feedwater pump performance curve; setting the outlet to a pressure outlet with a pressure value determined based on the boiler's operating conditions; and setting the vent outlet to a pressure outlet based on atmospheric pressure or engine room ambient pressure.

[0034] Specifically, the fluid operation parameters are set to reproduce the actual working state of the ship's water supply system. As the power source of the water supply system, the output flow rate or velocity of the feedwater pump is not a constant value, but rather changes dynamically with operating conditions. By inputting time-varying data based on the feedwater pump performance curve, the flow pulsation characteristics at different stages, such as pump startup, stable operation, and load adjustment, can be simulated. For example, the dynamic change of the inlet flow rate gradually increasing from 0 to the rated value during the process of the feedwater pump from startup to stable operation. The boiler's operating conditions directly determine the outlet pressure. When the boiler is in its rated operating state, the outlet pressure is set to the boiler operating pressure. When the boiler safety valve is triggered, the outlet pressure is adjusted according to the safety valve setting. The constant pressure adjustment ensures that the outlet boundary conditions match the actual operating pressure of the boiler. The function of the empty vent is to drain water from the pipeline. Its pressure is directly related to the engine room environment. Setting it to atmospheric pressure or engine room environmental pressure can realistically simulate the pressure difference driving effect inside and outside the pipeline during venting. For example, when water in the pipeline needs to be drained, a pressure difference is formed between the empty vent and the inside of the pipeline, pushing the water to flow out through the empty vent. These parameter settings together provide a realistic operating environment for the two core operating conditions of "normal water supply" and "pipeline venting". This ensures that the simulation results can accurately reflect the flow characteristics of the valve under different operating conditions, solving the problem of traditional simulation parameter settings being too simple and disconnected from actual operating conditions.

[0035] S102. The simulation device for the flow characteristics of the ship's water supply and air discharge valve calculates the force on the valve disc in real time by constructing a six-degree-of-freedom dynamic model, and solves and updates the spatial position and attitude of the valve disc at each time step based on the force on the valve disc.

[0036] Specifically, since the movement of valve discs in a ship's water supply system is not a simple fixed trajectory or uniform switching, but is subject to the combined action of multiple forces and changes in real time, in order to reproduce the dynamic response of valve discs under real working conditions and break the limitations of pre-setting valve disc motion laws in traditional simulations, a six-degree-of-freedom dynamic model can be constructed to calculate the forces on the valve discs in real time, fully capture the translational and rotational states of the valve discs in three-dimensional space, and ensure the comprehensiveness of motion simulation.

[0037] Constructing a six-degree-of-freedom dynamic model requires relying on the coupling principle of fluid mechanics and rigid body dynamics. A real-time data interaction channel is established between the dynamic model and the computational fluid dynamics (CFD) solver through a user-defined function (UDF).

[0038] Within each computation time step, the fluid pressure and viscous force acting on the valve disc surface are first obtained through the CFD solver. Then, combined with the preset valve disc gravity, spring force and friction torque data, the resultant force and resultant torque on the valve disc are calculated through a six-degree-of-freedom dynamic model. Subsequently, the acceleration, angular velocity and other motion parameters of the valve disc are solved according to the rigid body motion equation, thereby updating the spatial position and attitude of the valve disc.

[0039] This real-time coupled calculation method can accurately reproduce the complex dynamic behaviors of valve opening and closing lag and abnormal flapping, solving the problem that traditional simplified motion models cannot reflect the real force response, providing accurate dynamic boundary conditions for subsequent flow field calculations, and ensuring the high accuracy and realism of simulation results.

[0040] Optionally, the forces acting on the valve disc include fluid pressure, viscous force, its own weight, spring preload, spring deformation force, and frictional torque at the valve shaft hinge.

[0041] It should be noted that fluid pressure and viscous force are fed back in real time by flow field calculation. For example, during normal water supply, the impact pressure of water flow on the valve disc will increase with the change in flow rate. When the pipeline is emptied, the force of the gas-liquid two-phase flow on the valve disc exhibits unsteady fluctuations. The weight of the valve disc itself is determined by its material and geometric dimensions and is a constant force that always acts on the valve disc. The spring preload is preset according to the valve design requirements to ensure the sealing performance of the valve disc. The spring deformation force is dynamically adjusted with the change of valve disc opening. The larger the valve disc opening, the greater the spring deformation and the stronger the deformation force. The frictional torque at the valve shaft hinge is determined by the hinge structure, material friction coefficient and contact pressure, simulating the mechanical resistance when the valve disc rotates. For example, the frictional torque will increase accordingly when there is wear on the hinge.

[0042] S103. The simulation device for the flow characteristics of the ship's water supply and air discharge valve uses dynamic mesh technology to adaptively adjust the computational domain according to the spatial position and attitude of the valve disc, so as to handle the changes in the flow field boundary caused by the movement of the valve disc.

[0043] Because the valve disc undergoes continuous changes in spatial position and attitude, such as opening, closing, and fluttering, under stress, and the computational domain mesh, as the discretized unit for flow field calculation, cannot adjust in real time to follow the valve disc's movement, mesh stretching, distortion, or even breakage can occur. This directly leads to decreased computational accuracy, convergence difficulties, or even program crashes. Therefore, to resolve the contradiction between the dynamic movement of the valve disc and the adaptation of the computational domain mesh, dynamic meshing technology can be used to adapt to the valve disc's movement in real time, ensuring that the computational domain is always in a high-quality mesh state, providing a stable computational foundation for the accurate solution of subsequent fluid control equations.

[0044] Optionally, the adaptive adjustment of the computational domain using dynamic meshing technology includes: using a combination of elastic smoothing and local reconstruction methods, when the valve movement causes local mesh deformation to exceed a preset threshold, the mesh of the corresponding region is re-divided.

[0045] Specifically, to balance the flexibility of mesh adjustment with computational efficiency, the mesh can first be made elastic by using the elastic smoothing method. When the valve disc moves slightly, the mesh will naturally stretch and shrink with the valve disc displacement, maintaining the smoothness and continuity of the mesh. For example, the small-angle rotation of the valve disc at the initial opening stage can be slightly adjusted by elastic smoothing without re-dividing. However, when the valve disc moves significantly and the local mesh deformation exceeds the preset quality threshold, the local reconstruction method will initiate the re-division of the mesh in the severely deformed area to ensure that the key indicators such as the orthogonality and aspect ratio of the mesh in that area meet the computational requirements, avoiding the distortion of flow field data caused by poor mesh quality. For example, when the valve disc quickly opens from the fully closed state to the maximum opening, the mesh near the valve seat deforms drastically. High-quality mesh can be quickly generated through local reconstruction, which not only ensures the timeliness of mesh adaptation but also avoids the waste of computational resources caused by global mesh reconstruction.

[0046] S104. The simulation device for the flow characteristics of the ship's water supply air drain valve is based on the adjusted computational domain and combines the preset turbulence model and multiphase flow model to solve the fluid control equations in order to obtain the flow field distribution, pressure change and gas-liquid two-phase interface evolution law inside the air drain valve.

[0047] Specifically, the adjusted computational domain provides a high-quality, dynamically adaptable discretization space for flow field calculations, ensuring reliable fundamental conditions for solving the fluid control equations. Pre-defined turbulence and multiphase flow models are designed for different operating conditions. The turbulence model adapts to the complex flow scenarios inside ship vent valves. During normal water supply, the high water velocity and complex channel structure easily generate turbulent phenomena such as separated flow and swirling flow. This model can accurately capture both the laminar-turbulent transition near the wall and the turbulent characteristics in the far field, ensuring the accuracy of flow field calculations. The multiphase flow model adapts to the gas-liquid two-phase flow during pipeline venting. During venting, water and air coexist in the pipeline, and the interface between the two phases changes dynamically. This model, by tracking the gas-liquid interface, can accurately simulate the distribution range, interaction, and interface evolution of the two phases.

[0048] Fluid control equations are the core mathematical equations describing the laws of fluid motion, encompassing fundamental laws such as mass conservation and momentum conservation. Solving these equations numerically transforms abstract physical laws into concrete flow field data, ultimately outputting the flow field distribution, pressure changes, and gas-liquid two-phase interface evolution laws inside the vent valve. This provides data support for macroscopic performance evaluation and detailed basis for microscopic flow field analysis, achieving comprehensive and accurate capture of the flow characteristics under two core operating conditions: "normal water supply" and "pipeline venting." It solves the technical challenge of traditional simulations being unable to simultaneously handle complex turbulence and gas-liquid two-phase flow simulations.

[0049] Optionally, before solving the fluid control equations, the method further includes: activating a preset cavitation model when there is a risk of cavitation in the simulation conditions.

[0050] Specifically, under normal water supply conditions, cavitation can easily occur in areas such as before and after the valve disc and in narrow flow channels due to local pressures lower than the saturated vapor pressure of water. The bubbles generated by cavitation move with the water flow, and when they collapse, they impact components such as the valve disc and valve seat, severely affecting the valve's service life and sealing performance. A pre-defined cavitation model can accurately simulate the entire process of bubble generation, growth, migration, and collapse. By calculating parameters such as vapor volume fraction, it can clearly locate the area and intensity of cavitation. For example, when the output pressure of the water pump is too high, causing a sudden drop in local pressure after the valve, the cavitation model can capture the generation and distribution of bubbles in that area, providing data support for assessing the valve's resistance to cavitation and solving the problems of traditional simulations ignoring cavitation phenomena and failing to predict the risk of cavitation damage.

[0051] Optionally, the above-mentioned preset cavitation model can be the Schnerr-Sauer model.

[0052] Optionally, after solving the fluid control equations, the method further includes: extracting macroscopic parameters and analyzing the streamline diagram, pressure cloud diagram, velocity vector diagram, and cavitation region distribution inside the air vent valve, wherein the macroscopic parameters include the flow coefficient, flow resistance coefficient, and valve disc opening and closing time.

[0053] Specifically, among the macroscopic parameters, the flow coefficient reflects the valve's flow capacity, the flow resistance coefficient reflects the degree to which the valve impedes water flow, and the valve disc opening and closing time directly relates to the valve's response efficiency. These parameters can be directly used for quantitative evaluation of valve performance. For example, by comparing the flow coefficients of different design schemes, a valve structure with superior flow performance can be quickly selected. Streamline diagrams can visually display the movement trajectory of water flow inside the valve, clearly presenting complex flow phenomena such as vortices and backflow. Pressure cloud maps can reflect the differences in pressure distribution in different areas, helping to identify pressure concentration problems in key areas such as sealing surfaces. Velocity vector maps can accurately display the speed and direction of water flow, providing a basis for predicting cavitation risk areas. The distribution of cavitation areas directly indicates the location and range of bubble generation. This microscopic flow field information provides precise improvement directions for valve structure optimization. For example, based on the backflow areas appearing in the streamline diagram, the valve disc shape can be adjusted to optimize the flow channel design, solving the problem that traditional tests cannot observe the details of the internal flow field of the valve. Thus, the valve's flow characteristics can be comprehensively evaluated from both macroscopic performance and microscopic flow field dimensions.

[0054] In this embodiment, by constructing a valve-pipe coupling model including the air vent valve body, the upstream sluice pipe, and the downstream boiler connecting pipe, and determining the corresponding fluid operating parameters, the coupling effect between the pipeline system and the air vent valve can be fully considered. This avoids the boundary condition distortion problem caused by isolated valve analysis in conventional simulations, making the simulation environment closer to engineering reality. By calculating the valve disc's force and updating its spatial position and attitude in real time through a six-degree-of-freedom dynamic model, and abandoning the traditional simplified motion law, the complex dynamic response of the valve disc under the combined action of real hydraulic impact, gravity, spring force, and hinge friction can be accurately reproduced, solving the defect of inaccurate valve disc motion simulation in conventional simulations. By using dynamic mesh technology to adaptively adjust the computational domain and combining the preset turbulence model and multiphase flow model to solve the fluid control equations, the mesh distortion caused by valve disc motion can be effectively handled, accurately capturing the complex flow field, pressure changes, and gas-liquid two-phase interface evolution law inside the valve, making up for the lack of detailed flow field information obtained by empirical design and conventional simulation. This significantly improves the accuracy and comprehensiveness of the simulation of the flow characteristics of the air vent valve, enabling in-depth performance optimization of the valve without relying on high-cost physical prototype testing, while also improving analysis efficiency and providing reliable technical support for the safe and stable operation of the ship's power system.

[0055] The foregoing mainly describes the solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, it includes corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, in conjunction with the units and algorithm steps of the various examples described in the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0056] It should be noted that the device in the embodiments of this application includes a virtual device and a physical device. The virtual device can be a flow characteristic simulation device for ship water supply and exhaust valves, and the physical device can include electronic devices, computer storage media, and computer program products.

[0057] The flow characteristic simulation method for a ship's feedwater empty drain valve provided in this application embodiment can be executed by a flow characteristic simulation device for a ship's feedwater empty drain valve, or by a control module within that device for simulating the flow characteristics of the ship's feedwater empty drain valve. This application embodiment uses the execution of the flow characteristic simulation method for a ship's feedwater empty drain valve by a flow characteristic simulation device as an example to illustrate the flow characteristic simulation device for a ship's feedwater empty drain valve provided in this application embodiment.

[0058] It should be noted that, according to the above method examples, the flow characteristic simulation device for ship feedwater discharge valves can be divided into functional modules. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one processing module. The integrated modules can be implemented in hardware or as software functional modules. Optionally, the module division in this embodiment is illustrative and only represents one logical functional division; in actual implementation, there may be other division methods.

[0059] like Figure 3As shown in the figure, this application embodiment provides a simulation device 300 for the flow characteristics of a ship's feedwater vent valve. The simulation device 300 includes a construction module, a processing module, and a solution module. The construction module is used to construct a valve-pipe coupling model and determine the fluid operation parameters of the valve-pipe coupling model. The valve-pipe coupling model includes the vent valve body, the upstream sluice pipe of the vent valve body, and the downstream boiler connection pipe. A six-degree-of-freedom dynamic model is constructed to calculate the valve disc force in real time, and the spatial position and attitude of the valve disc are solved and updated at each time step based on the valve disc force. The processing module is used to adaptively adjust the computational domain using dynamic mesh technology according to the spatial position and attitude of the valve disc to handle the flow field boundary changes caused by the valve disc movement. The solution module is used to solve the fluid control equations based on the adjusted computational domain, combined with a preset turbulence model and a multiphase flow model, to obtain the flow field distribution, pressure changes, and gas-liquid interface evolution law inside the vent valve.

[0060] Optionally, determining the fluid operating parameters of the valve-pipe coupling model includes: setting the inlet to a mass flow rate inlet or a velocity inlet, and inputting time-varying data determined by the feedwater pump performance curve; setting the outlet to a pressure outlet with a pressure value determined based on the boiler's operating conditions; and setting the vent outlet to a pressure outlet based on atmospheric pressure or engine room ambient pressure.

[0061] Optionally, the forces acting on the valve disc include fluid pressure, viscous force, its own weight, spring preload, spring deformation force, and frictional torque at the valve shaft hinge.

[0062] Optionally, the adaptive adjustment of the computational domain using dynamic meshing technology includes: using a combination of elastic smoothing and local reconstruction methods, when the valve movement causes local mesh deformation to exceed a preset threshold, the mesh of the corresponding region is re-divided.

[0063] Optionally, before solving the fluid control equations, the processing module 302 is also used to enable a preset cavitation model when there is a risk of cavitation in the simulation conditions.

[0064] Optionally, after solving the fluid control equations, the solution module 303 is used to extract macroscopic parameters and analyze the streamline diagram, pressure cloud diagram, velocity vector diagram and cavitation region distribution inside the air vent valve. The macroscopic parameters include the flow coefficient, flow resistance coefficient and valve disc opening and closing time.

[0065] In this embodiment, by constructing a valve-pipe coupling model including the air vent valve body, the upstream sluice pipe, and the downstream boiler connecting pipe, and determining the corresponding fluid operating parameters, the coupling effect between the pipeline system and the air vent valve can be fully considered. This avoids the boundary condition distortion problem caused by isolated valve analysis in conventional simulations, making the simulation environment closer to engineering reality. By calculating the valve disc's force and updating its spatial position and attitude in real time through a six-degree-of-freedom dynamic model, and abandoning the traditional simplified motion law, the complex dynamic response of the valve disc under the combined action of real hydraulic impact, gravity, spring force, and hinge friction can be accurately reproduced, solving the defect of inaccurate valve disc motion simulation in conventional simulations. By using dynamic mesh technology to adaptively adjust the computational domain and combining the preset turbulence model and multiphase flow model to solve the fluid control equations, the mesh distortion caused by valve disc motion can be effectively handled, accurately capturing the complex flow field, pressure changes, and gas-liquid two-phase interface evolution law inside the valve, making up for the lack of detailed flow field information obtained by empirical design and conventional simulation. This significantly improves the accuracy and comprehensiveness of the simulation of the flow characteristics of the air vent valve, enabling in-depth performance optimization of the valve without relying on high-cost physical prototype testing, while also improving analysis efficiency and providing reliable technical support for the safe and stable operation of the ship's power system.

[0066] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include: a processor 410, a communications interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communications interface 420, and the memory 430 communicate with each other through the communication bus 440. The processor 410 can call logic instructions in the memory 430 to execute a simulation method for the flow characteristics of a ship's feedwater vent valve. This method includes: constructing a valve-pipe coupling model and determining the fluid operation parameters of the valve-pipe coupling model, which includes the vent valve body, the upstream sluice pipe of the vent valve body, and the downstream boiler connection pipe; calculating the valve disc force in real time by constructing a six-degree-of-freedom dynamic model, and solving and updating the spatial position and attitude of the valve disc at each time step based on the valve disc force; adaptively adjusting the computational domain using dynamic mesh technology based on the spatial position and attitude of the valve disc to handle the flow field boundary changes caused by the valve disc movement; and solving the fluid control equations based on the adjusted computational domain, combined with a preset turbulence model and multiphase flow model, to obtain the flow field distribution, pressure changes, and gas-liquid interface evolution law inside the vent valve.

[0067] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0068] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the simulation method for the flow characteristics of the ship feedwater vent valve provided by the above methods. The method includes: constructing a valve-pipe coupling model and determining the fluid operation parameters of the valve-pipe coupling model, wherein the valve-pipe coupling model includes the vent valve body, the upstream sluice pipe of the vent valve body and the downstream boiler connection pipe; calculating the valve disc force in real time by constructing a six-degree-of-freedom dynamic model, solving and updating the spatial position and attitude of the valve disc at each time step based on the valve disc force; adaptively adjusting the computational domain using dynamic mesh technology according to the spatial position and attitude of the valve disc to handle the flow field boundary changes caused by the valve disc movement; and solving the fluid control equations based on the adjusted computational domain, combined with a preset turbulence model and a multiphase flow model, to obtain the flow field distribution, pressure changes and gas-liquid two-phase interface evolution law inside the vent valve.

[0069] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program implements a simulation method for the flow characteristics of a ship feedwater vent valve provided by the above methods. The method includes: constructing a valve-pipe coupling model and determining the fluid operation parameters of the valve-pipe coupling model, wherein the valve-pipe coupling model includes the vent valve body, the upstream sluice pipe of the vent valve body, and the downstream boiler connection pipe; calculating the valve disc force in real time by constructing a six-degree-of-freedom dynamic model, solving and updating the spatial position and attitude of the valve disc at each time step based on the valve disc force; adaptively adjusting the computational domain using dynamic mesh technology according to the spatial position and attitude of the valve disc to handle the flow field boundary changes caused by the valve disc movement; and solving the fluid control equations based on the adjusted computational domain, combined with a preset turbulence model and a multiphase flow model, to obtain the flow field distribution, pressure changes, and gas-liquid two-phase interface evolution law inside the vent valve.

[0070] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0071] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for simulating the flow characteristics of a ship's feedwater vent valve, characterized in that, include: A valve-pipe coupling model is constructed, and the fluid operation parameters of the valve-pipe coupling model are determined. The valve-pipe coupling model includes an air vent valve body, an upstream water vent pipe of the air vent valve body, and a downstream boiler connection pipe. The forces acting on the valve disc are calculated in real time by constructing a six-degree-of-freedom dynamic model. Based on the forces acting on the valve disc, the spatial position and attitude of the valve disc at each time step are solved and updated. Based on the spatial position and orientation of the valve disc, dynamic mesh technology is used to adaptively adjust the computational domain to handle the changes in the flow field boundary caused by the valve disc motion; Based on the adjusted computational domain, and combined with the preset turbulence model and multiphase flow model, the fluid control equations are solved to obtain the flow field distribution, pressure changes, and gas-liquid two-phase interface evolution law inside the air vent valve.

2. The simulation method for the flow characteristics of a ship's feedwater drain valve according to claim 1, characterized in that, Determining the fluid operating parameters of the valve-pipe coupling model includes: Set the inlet to either mass flow rate or velocity, and input the time-varying data determined by the feedwater pump performance curve; Set the outlet to a pressure outlet whose pressure value is determined based on the boiler's operating conditions; Configure the air vent as a pressure outlet based on atmospheric pressure or cabin ambient pressure.

3. The simulation method for the flow characteristics of a ship's feedwater drain valve according to claim 1, characterized in that, The forces acting on the valve disc include fluid pressure, viscous force, its own weight, spring preload, spring deformation force, and frictional torque at the valve shaft hinge.

4. The simulation method for the flow characteristics of a ship's feedwater vent valve according to claim 1, characterized in that, The adoption of dynamic mesh technology to adaptively adjust the computational domain includes: By combining the elastic smoothing method and the local reconstruction method, when the valve movement causes the local mesh deformation to exceed a preset threshold, the mesh of the corresponding region is re-divided.

5. The simulation method for the flow characteristics of a ship's feedwater vent valve according to claim 1, characterized in that, Before solving the fluid control equations, the method further includes: When there is a risk of cavitation in the simulation, the preset cavitation model is activated.

6. The simulation method for the flow characteristics of a ship's feedwater vent valve according to claim 1, characterized in that, After solving the fluid control equations, the method further includes: Macroscopic parameters are extracted and analyzed, including streamline diagrams, pressure cloud diagrams, velocity vector diagrams, and cavitation region distribution inside the vent valve. The macroscopic parameters include flow coefficient, flow resistance coefficient, and valve disc opening and closing time.

7. A simulation device for the flow characteristics of a ship's feedwater drain valve, characterized in that, include: Modules for building, processing, and solving; The construction module is used to construct a valve-pipe coupling model and determine the fluid operation parameters of the valve-pipe coupling model. The valve-pipe coupling model includes an air vent valve body, an upstream water vent pipe of the air vent valve body, and a downstream boiler connection pipe. The forces acting on the valve disc are calculated in real time by constructing a six-degree-of-freedom dynamic model. Based on the forces acting on the valve disc, the spatial position and attitude of the valve disc at each time step are solved and updated. The processing module is used to adaptively adjust the computational domain using dynamic mesh technology based on the spatial position and orientation of the valve disc, so as to handle the changes in the flow field boundary caused by the movement of the valve disc. The solution module is used to solve the fluid control equations based on the adjusted computational domain and in combination with the preset turbulence model and multiphase flow model, so as to obtain the flow field distribution, pressure change and gas-liquid two-phase interface evolution law inside the air vent valve.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the simulation method for the flow characteristics of the ship's water supply and air discharge valve as described in any one of claims 1 to 6.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the flow characteristic simulation method of the ship's water supply and air discharge valve as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the flow characteristic simulation method of the ship's water supply and air discharge valve as described in any one of claims 1 to 6.

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