Physical simulation method and device for transportation effect of submarine organisms in nuclear power plant

Abstract

The invention discloses a physical simulation method and device for the transportation effect of submarine organisms in a nuclear power plant, and the method comprises the steps: obtaining the motion parameters of target submarine organisms in the nuclear power plant, the motion parameters comprise one or more of individual mass, volume, body length, settling velocity, critical starting friction flow velocity, critical starting vertical line average flow velocity, starting wave height and critical starting flow velocity of target benthos of the nuclear power plant; establishing a physical model for simulating the transportation effect of the submarine organisms of the nuclear power plant; determining a simulant of the target benthos based on the motion parameters of the target benthos and a physical model; and simulating the amount of motion of the target benthos of the nuclear power plant by using the simulant and the physical model. In this way, it can be guaranteed that the motion process of the simulant should be kept similar to the actual motion process of the target benthic organism, the scale effect is avoided, and the premise is provided for accurately evaluating the entrainment and entrainment risk of the subbottom organism.

Description

Technical Field

[0001] The present invention relates to the technical fields of ocean engineering and nuclear power water intake safety, and particularly relates to a physical simulation method and device for the physical transport of marine organisms in a nuclear power plant. Background Art

[0002] The physical model test of water transportation engineering simulation is an entity model scaled according to certain similarity conditions or similarity criteria of the research object, and has the characteristics of clear mechanism and intuitive phenomenon. It is an important method for carrying out research on marine material transport. In recent years, with the continuous increase in the entrainment accidents of the cold source intake of nuclear power plants, the cold source safety problem of the intake has attracted more and more attention from the public. Simulating the transport movement law of disaster-causing organisms under the action of waves and currents through the overall physical model test has become an important means for risk assessment of the intake of nuclear power plants. In the estuary and coastal areas, the combined action of waves and tides is the main dynamic factor causing the transport movement of bottom sediments. However, the current research on bottom objects mainly focuses on non-biological sediments such as sediment, and the physical model research on the transport of biological sediments under the action of waves and tides is still blank. In addition, due to site and other conditions, it is usually difficult for physical models to achieve large-scale flow field simulation, resulting in scale effects. Therefore, it is of great significance to develop a physical model simulation method for the starting and transport movement characteristics of bottom organisms in the sea area based on a large-scale flow field under the action of waves and tides.

[0003] The existing patent CN116629086A discloses a method and system for calculating the sediment incipient motion in a vegetated area of a compound channel. The method includes the following steps: obtaining the physical properties of sediment particles, constructing an experimental flume model, and configuring sensors; performing a simulation experiment according to the experimental parameters, and obtaining the flow state parameters of the water flow under each working condition from the constructed experimental flume model based on the pre-configured sensors; constructing a sediment incipient motion model, using the physical properties of sediment particles and the flow state parameters of the water flow as the input conditions for simulation, simulating the sediment incipient motion process, and obtaining the process and characteristic data of sediment incipient motion; comparing the simulation results of the sediment incipient motion model with the measured data, evaluating the practicability and accuracy of the sediment incipient motion model, and if meeting the conditions, outputting the sediment incipient motion model for subsequent calculation of the sediment incipient motion process in the vegetated area of the compound channel.

[0004] The existing patent CN103437319A discloses a design method for a movable-bed physical model for regulating the dangerous channels of pebble beaches in the upper reaches of the Yangtze River, including the following steps: selecting a suitable model sand; determining a suitable model scale; determining the model geometric shape. Through a comparative study of the physical properties of lightweight model sand and natural sand; through a 28m flume test, the movement characteristics of natural sand and lightweight sand, two types of model sand, were studied and compared from three aspects: sediment incipient motion, sediment transport rate, and sand wave movement; through physical model tests, the adaptability of natural model sand and lightweight model sand in simulating the scouring and silting of navigation channels was studied and compared; the adaptability of the two types of model sand in the movable-bed physical model of bed load was analyzed; combined with the characteristics of different model sands and the analysis of the water flow and sediment movement characteristics of the pebble beaches in the upper reaches of the Yangtze River, a design method for a movable-bed physical model for regulating the dangerous channels of pebble beaches in the upper reaches of the Yangtze River was obtained.

[0005] In summary, the above two existing patents are both aimed at the study of sediment incipient motion, and are not applicable to the simulation of the transport of biological sediments under the action of waves and tides, nor do they overcome the phenomenon of distortion of the physical model simulation results caused by ignoring the large-scale flow field in the existing technology. Summary of the Invention

[0006] Based on the above technical problems, the present invention proposes a physical simulation method and device for the transport of submarine organisms in a nuclear power plant, which overcomes the phenomenon of distortion of the physical model simulation results caused by ignoring the large-scale flow field in the existing technology.

[0007] A physical simulation method for the transport of submarine organisms in a nuclear power plant includes:

[0008] Obtaining the motion parameters of the target submarine organisms in the nuclear power plant;

[0009] Establishing a physical model for simulating the transport of submarine organisms in the nuclear power plant;

[0010] Based on the motion parameters of the target submarine organisms and the physical model, determining the simulation objects of the target submarine organisms;

[0011] Using the simulation objects and the physical model to simulate the motion quantity of the target submarine organisms in the nuclear power plant.

[0012] Further, obtaining the motion parameters of the target submarine organisms in the nuclear power plant includes:

[0013] Conducting a flume test on the target submarine organisms in the nuclear power plant to obtain the motion parameters of the target submarine organisms in the nuclear power plant, where the motion parameters include one or more of the individual mass, volume, body length, settling velocity, critical incipient motion friction velocity, critical incipient motion vertical average velocity, incipient motion wave height, and critical incipient motion velocity of the target submarine organisms in the nuclear power plant.

[0014] Furthermore, flume tests are carried out on the target submarine organisms in nuclear power plants, including: carrying out basic physical property tests, individual settling velocity physical model tests and basic hydraulic property tests on the target submarine organisms in nuclear power plants.

[0015] Furthermore, basic physical property tests are carried out on the target submarine organisms in nuclear power plants, including:

[0016] Use an electronic scale and a measuring cylinder to measure the individual mass and volume of the target submarine organisms in nuclear power plants respectively, and obtain the individual mass and volume of the target submarine organisms in nuclear power plants.

[0017] Furthermore, individual settling velocity physical model tests are carried out on the target submarine organisms in nuclear power plants, including:

[0018] Put the target submarine organisms in nuclear power plants into a preset test flume, observe and record the settling process of the target submarine organisms in nuclear power plants, and obtain the settling velocity of the target submarine organisms in nuclear power plants.

[0019] Furthermore, basic hydraulic property tests are carried out on the target submarine organisms in nuclear power plants, including:

[0020] Under the action of a constant flow, carry out starting velocity tests on individual target submarine organisms in nuclear power plants with different masses, and determine the critical starting friction velocity and critical starting vertical mean velocity of the target submarine organisms in nuclear power plants under the action of a constant flow;

[0021] Under the action of waves alone, carry out starting velocity tests on individual target submarine organisms in nuclear power plants with different masses, and determine the critical starting velocity of the target submarine organisms in nuclear power plants under the action of waves;

[0022] Under the combined action of waves and flow, carry out transport characteristic tests on individual target submarine organisms in nuclear power plants with different masses, and determine the critical starting velocity of the target submarine organisms in nuclear power plants under the combined action of waves and flow.

[0023] Furthermore, establish a physical model for simulating the transport of submarine organisms in nuclear power plants, including:

[0024] According to the preset similarity criteria for water flow motion and the preset similarity criteria for wave motion, establish a physical model for simulating the transport of submarine organisms in nuclear power plants.

[0025] Furthermore, the preset similarity criteria for water flow motion include:

[0026] Gravity similarity criterion, where λ u is the velocity scale ratio, λ v is the velocity scale ratio, λ h is the vertical scale ratio;

[0027] Drag force similarity scale ratio, λ c=(λ l / λ h ) 1 / 2 , where λ c is the drag scale ratio, λ l is the horizontal scale ratio, and λ h is the vertical scale ratio;

[0028] The time scale ratio of water flow movement, where λ t is the time scale ratio of water flow movement;

[0029] The vertical scale ratio should satisfy where λ h is the vertical scale ratio, V p is the characteristic velocity, h p is the water depth, and v is the kinematic viscosity.

[0030] Furthermore, the preset wave motion similarity criteria include:

[0031] The wave refraction similarity criterion, λ L =λ H =λ h , where λ L is the wavelength scale ratio, λ H is the wave height scale ratio, and λ h is the vertical scale ratio;

[0032] The wave steepness similarity criterion, where is the wave steepness scale ratio;

[0033] The wave propagation speed similarity criterion, where λ T is the wave propagation speed scale ratio.

[0034] Furthermore, based on the motion parameters and physical model of the target benthic organism, determine the analog of the target benthic organism, including:

[0035] Place the preset analog in the physical model to obtain the motion parameters of the preset analog;

[0036] Judge whether the motion parameters of the preset analog and the target benthic organism satisfy the benthic organism motion similarity criterion;

[0037] If the motion parameters of the preset analog and the target benthic organism satisfy the benthic organism motion similarity criterion, then use the preset analog as the analog of the target benthic organism.

[0038] Furthermore, the benthic organism motion similarity criterion includes:

[0039] The benthic organism incipient motion similarity criterion: Among them, is the starting flow velocity scale ratio of seabed organisms, λ v is the starting flow velocity of seabed organisms;

[0040] Sedimentation similarity criterion for seabed organisms: λ w = λ v where λ w is the sedimentation velocity scale ratio of seabed organisms;

[0041] Transport rate similarity criterion for seabed organisms: Among them, is the transport rate scale ratio of seabed organisms, is the movement speed scale ratio of the target seabed organisms, λ n is the habitat density scale ratio of the target seabed organisms, is the individual mass scale ratio of seabed organisms.

[0042] Furthermore, the target seabed organisms in the nuclear power plant include one or more of nereis, clams, and sea cucumbers.

[0043] A physical simulation device for the transport of seabed organisms in a nuclear power plant, which is used to execute the above method. The device includes:

[0044] An acquisition module, which is used to acquire the movement parameters of the target seabed organisms in the nuclear power plant;

[0045] A establishment module, which is used to establish a physical model for simulating the transport of seabed organisms in the nuclear power plant;

[0046] A determination module, which is used to determine the analog of the target seabed organisms based on the movement parameters of the target seabed organisms and the physical model;

[0047] A simulation module, which is used to simulate the movement quantity of the target seabed organisms in the nuclear power plant by using the analog and the physical model.

[0048] Based on the above technical solutions, the present invention has at least the following beneficial effects:

[0049] 1. By conducting flume tests on the movement laws of the target seabed organisms in the nuclear power plant, the present invention acquires the movement parameters of the target seabed organisms in the nuclear power plant. Based on the basic information obtained from the flume tests, according to the similarity criteria of the overall physical model test, a corresponding physical model is established and a corresponding analog is selected. In this way, it can be ensured that the movement process of the analog should be similar to the actual movement process of the target seabed organisms, avoiding the scale effect, and being able to overcome the phenomenon of distortion of the physical model simulation results caused by ignoring the large-scale flow field, providing a premise for accurately evaluating the risk of entrainment and plugging of benthic organisms. Description of the Drawings

[0050] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0051] Figure 1 It is a flow chart of a physical simulation method for the seabed biological transport effect of a nuclear power plant according to an embodiment of the present invention;

[0052] Figure 2 It is a schematic diagram of a physical simulation device for the seabed biological transport effect of a nuclear power plant according to an embodiment of the present invention. Detailed implementation manners

[0053] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] The following further describes the present invention in detail with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present invention.

[0055] Embodiment

[0056] To solve the problem that the existing sediment models cannot be applied to the simulation of seabed biological transport and overcome the phenomenon of distorted physical model simulation results caused by ignoring the large-scale flow field in the prior art, the present invention proposes a physical simulation method and device for the seabed biological transport effect of a nuclear power plant. By conducting a flume experiment on the movement law of the target seabed organisms, the movement parameters of the target organisms are obtained. Based on the analysis of the basic information obtained from the flume experiment, according to the similarity criteria of the overall physical model experiment (such as geometric similarity, gravity similarity, resistance similarity, water flow movement similarity, seabed biological movement similarity, etc.) and combining the main movement processes of the seabed organisms and the laboratory conditions, the physical model is determined and appropriate simulation objects are selected. According to the geographical location, meteorological conditions, tidal current and wave hydraulic characteristics of a certain nuclear power plant, the normal scale model experiment method is adopted, and appropriate model scales and model layout ranges are selected. Using the selected simulation objects and physical models, physical model experiments are carried out under different working conditions (types of seabed blockages, waves, tidal currents, combined action of waves and currents) to realize the simulation of the seabed biological transport effect of the nuclear power plant.

[0057] As Figure 1 shown in the flow chart of a physical simulation method for the seabed biological transport effect of a nuclear power plant according to an embodiment of the present invention, the process includes the following steps:

[0058] S1. Obtain the movement parameters of the target seabed organisms of the nuclear power plant.

[0059] The target seabed organisms in a nuclear power plant include one or more of nereis, clams, and sea cucumbers. In this embodiment, nereis, clams, and sea cucumbers are used as the target seabed organisms in the nuclear power plant. It should be understood that different target seabed organisms can be selected for physical simulation in different scenarios.

[0060] Obtaining the motion parameters of the target seabed organisms in a nuclear power plant includes: conducting a flume test on the target seabed organisms in a nuclear power plant to obtain the motion parameters of the target seabed organisms in a nuclear power plant. The motion parameters include one or more of the individual mass, volume, body length, sinking velocity, critical starting friction velocity, critical starting vertical average velocity, starting wave height, and critical starting velocity of the target seabed organisms in a nuclear power plant. The process of obtaining the motion parameters of the target seabed organisms through the flume test will be described below.

[0061] Further, conducting a flume test on the target seabed organisms in a nuclear power plant includes: conducting a basic physical property test, an individual sinking velocity physical model test, and a basic hydraulic property test on the target seabed organisms in a nuclear power plant.

[0062] Among them, conducting a basic physical property test on the target seabed organisms in a nuclear power plant includes: measuring the individual mass and volume of the target seabed organisms in a nuclear power plant using an electronic scale and a graduated cylinder respectively to obtain the individual mass and volume of the target seabed organisms in a nuclear power plant. In this embodiment, the individual mass and volume of nereis, clams, and sea cucumbers are measured using a graduated cylinder and an electronic scale respectively to determine their density; by measuring the body length of the seabed organisms, the relationship between the individual mass and the body length is obtained. In this embodiment, natural sand from sandy coasts, silty sandy coasts, and muddy coasts is selected for the adaptability test of seabed organisms to different bottom sediments: after the natural sand is evenly arranged in the sand collection box, natural seawater is first injected to saturate it, and it is left standing for a period of time to consolidate the natural sand. Then, 5 seabed organisms are added to the surface of the sediment in the box, and the state of nereis is observed 2 hours later.

[0063] Conducting an individual sinking velocity physical model test on the target seabed organisms in a nuclear power plant includes: putting the target seabed organisms in a preset test flume, observing and recording the sinking process of the target seabed organisms in a nuclear power plant to obtain the sinking velocity of the target seabed organisms in a nuclear power plant. Specifically, the preset test flume in this embodiment is 3.0 m long × 3.0 m wide × 1.8 m high, and the whole is above the ground. The water depth in the flume is 1.535 m. At the center positions of two adjacent side walls, there are perspective observation windows with a height of 1.5 m × a width of 0.4 m, and cameras can be installed specifically for recording and observing the sinking motion process of the seabed organisms.

[0064] The test environment for conducting basic hydraulic property tests on the target submarine organisms of nuclear power plants is as follows: The test flume is 50 m long and 0.7 m wide. The proposed model test section is located in the middle of the flume, with the sediment on the bottom bed laid to a depth of 15 cm and the test water depth of 0.3 m. A two-way circulation water pump system is set up in the test flume to provide water flow for the test. A push-plate wave generator is arranged on one side of the flume, and wave generation is controlled by a computer. A wave-absorbing layer is arranged on the other side of the flume to prevent wave reflection. During the experiment, the flow velocity, wave height, and water level are measured.

[0065] Furthermore, basic hydraulic property tests are conducted on the target submarine organisms of nuclear power plants, including:

[0066] (1) Under the action of a steady flow, starting velocity tests are carried out on individual target submarine organisms of nuclear power plants with different masses. In the test, the overall translation or overall tumbling of the submarine organisms exceeding their own crawling speed is used as the criterion for judging the start of nereis. According to the test results, the main factors affecting individual start are analyzed, and the critical starting friction velocity and critical starting vertical average velocity of the target submarine organisms of nuclear power plants under the action of a steady flow are determined.

[0067] Taking raw fish slices as an example, its critical starting friction velocity under the action of a steady flow is u *c = 0.0068 m. Among them, the expression corresponding to the critical starting vertical average velocity is where u *c is the critical starting friction velocity, m is the mass of raw fish slices, and V c is the critical starting vertical average velocity.

[0068] (2) Under the action of waves alone, starting velocity tests are carried out on individual target submarine organisms of nuclear power plants with different masses. The test wave generation in this embodiment is a regular wave, and the wave periods are considered to be 1.2 s, 1.6 s, 2 s, and 2.4 s respectively. In the test, the overall translation or overall tumbling of the submarine organisms exceeding their own crawling speed is used as the criterion for judging the start, and the starting wave height corresponding to different individual masses and periods is analyzed. Considering that the shear stress on the bottom bed under the action of waves changes with time, the start is associated with the maximum dimensionless Shields parameter of the bottom bed caused by wave water particles. The calculation formulas for the starting wave height and critical starting velocity of nereis under the action of waves can be obtained, and then the critical starting velocity of the target submarine organisms of nuclear power plants under the action of waves is determined.

[0069] (3) Under the combined action of waves and flow, transport characteristic tests are carried out on individual target submarine organisms of nuclear power plants with different masses to determine the critical starting velocity of the target submarine organisms of nuclear power plants under the combined action of waves and flow.

[0070] Specifically, the preparations for the transport characteristic tests of three types of seabed organisms under the combined action of waves and currents in this embodiment are as follows: For the transport characteristic test of nereis, nereis individuals weighing 0.5 g to 3.3 g are selected in this embodiment, and the transport velocity test is carried out under the combined conditions of wave and current with a critical starting vertical mean velocity of 13.2 cm / s to 37.2 cm / s, a wave height of 2.9 cm to 7.7 cm, and periods of 1.2 s and 2 s. The test flow velocities cover 1.5V c ~3.5V c The test wave heights include 1.5H c ~3.5H c The test water depth is 0.3 m. Among them, V c is the critical starting vertical mean velocity, and H c is the critical starting wave height. For the transport characteristic test of clams, clam individuals weighing 6 g to 15 g are selected in this embodiment, and the transport velocity test is carried out under the combined conditions of wave and current with a critical starting vertical mean velocity of 9.86 cm / s to 31.51 cm / s, a wave height of 7.7 cm to 14.5 cm, and periods of 1.2 s, 1.6 s, 2 s, and 2.4 s. The flow velocity range is set to 0.3V c ~1V c The test wave height range is set to 1.0H c ~2.5H c The test water depth is 0.3 m. For the transport characteristic test of sea cucumbers, live sea cucumber individuals weighing 73.8 g to 120.3 g are selected in this embodiment, and the transport velocity test is carried out under the combined conditions of wave and current with a critical starting vertical mean velocity of 14 cm / s to 23.2 cm / s, a wave height of 1.6 cm to 5.2 cm, and periods of 1.2 s, 1.6 s, 2 s, and 2.4 s. In the wave and current test, the flow velocity range is set to 1V c ~3.5V c The test wave height range is set to 1.0H c ~5.0H c The test water depth is 0.3 m.

[0071] In addition, when conducting the group movement characteristic tests on three species of benthic organisms: Considering the influence of different group compositions on movement, 7 nereids with individual masses between 1 g and 1.4 g were selected as the "homogeneous group", and 7 nereid individuals with random masses between 0.5 g and 1.9 g were selected as the "mixed group". During the wave-current test, the nereids were concentrated and placed, and then their movement states were observed. To analyze the group movement characteristics of clams, the clam group test was divided into 3 groups, namely 16 clams with individual masses between 7.9 g and 9.6 g as the "homogeneous group", 25 clams with individual masses between 7.8 g and 10.6 g as the "homogeneous group", and 25 clams with individual masses between 7.4 g and 16.6 g as the "heterogeneous group". To analyze the group movement characteristics of sea cucumbers, the biological group movement flume test was carried out according to the maximum habitat density of 20 ind / m 2 Consider.

[0072] S2, establish a physical model for simulating the transport of benthic organisms in nuclear power plants.

[0073] Furthermore, establish a physical model for simulating the transport of benthic organisms in nuclear power plants, including: establishing a physical model for simulating the transport of benthic organisms in nuclear power plants according to the preset similarity criteria for water flow movement and the preset similarity criteria for wave movement.

[0074] In this embodiment, the preset similarity criteria for water flow movement include: the gravity similarity criterion, where λ u is the velocity scale ratio in the u direction, λ v is the velocity scale ratio in the v direction, and λ h is the vertical scale ratio. The resistance similarity scale ratio, λ c =(λ l / λ h ) 1 / 2 , where λ c is the resistance scale ratio, λ l is the horizontal scale ratio, and λ h is the vertical scale ratio. The water flow movement time scale ratio, where λ t is the water flow movement time scale ratio. Use the Manning formula to determine the Chezy coefficient, that is where n is the roughness coefficient and R is the hydraulic radius. The roughness scale ratio is: where λ n is the roughness scale ratio. The water flow in the physical model should be in the resistance square region, and it is required that the Reynolds number R e ≥1000, so the vertical scale ratio should satisfy, where λ h is the vertical scale ratio, V p is the characteristic velocity, and h pis the water depth, and v is the kinematic viscosity.

[0075] Furthermore, the preset wave motion similarity criteria include: the wave refraction similarity criterion, λ L = λ H = λ h , where λ L is the wavelength scale, λ H is the wave height scale, and λ h is the vertical scale. The wave steepness similarity criterion, where is the wave steepness scale. The wave propagation speed similarity criterion, where λ T is the wave propagation speed scale. Taking the wave refraction similarity criterion as an example, the wave refraction similarity criterion can be understood as that in order to maintain the similarity between the model and the prototype, when establishing a physical model, the wavelength scale and the wave height scale should be equal to the vertical scale.

[0076] In addition, the factors affecting the physical model scale mainly include: the area covered by the physical model boundary must meet the range of tidal current field changes caused by the current situation and the water intake scheme; the simulated width of the water intake channel in the physical model should not be too small, otherwise it will affect the flow pattern of the water flow in the water intake channel and the accurate simulation of the flow field at the mouth of the channel; to ensure the water flow stability of the open channel in the physical model test, the water depths at the intake and drainage open channels and the mouth of the channel should not be too small, and it is required that the minimum water depth in the test area in the physical model test should not be less than 10 cm under the lowest water level condition; the selection of the physical model scale should consider both the large-scale flow field of the model and the entrainment effect of the disaster-causing objects in the model, and try to avoid the scale effect as much as possible; the physical model test needs to ensure that the motion characteristics of the simulated object and the target seabed organisms are consistent.

[0077] S3. Based on the motion parameters of the target seabed organisms and the physical model, determine the simulated objects of the target seabed organisms.

[0078] Furthermore, based on the motion parameters of the target seabed organisms and the physical model, determining the simulated objects of the target seabed organisms includes the following steps:

[0079] S301. Place the preset simulated object in the physical model and obtain the motion parameters of the preset simulated object.

[0080] S302. Judge whether the motion parameters of the preset simulated object and the motion parameters of the target seabed organisms meet the seabed organism motion similarity criterion.

[0081] Furthermore, the seabed organism motion similarity criterion includes: the seabed organism starting similarity criterion: where is the seabed organism starting flow velocity scale. The seabed organism sedimentation similarity criterion: λ w= λ v , where λ w is the sedimentation velocity scale of seabed organisms. Similarity criterion for seabed organism transport rate: where is the transport rate scale of the target seabed organism, is the movement speed scale of the target seabed organism, λ n is the habitat density scale of seabed organisms, is the individual mass scale of seabed organisms.

[0082] In this embodiment, plastic flowers are selected as the preset simulation objects, and the incipient velocity and sedimentation velocity of the plastic flowers are measured through the individual sedimentation velocity physical model test and the basic hydraulic movement characteristic test. At the same time, the flume test of the plastic flowers under the action of waves and currents is carried out to determine the ratio of the movement speed of the plastic flowers to the critical incipient vertical mean velocity. The test results are compared with the calculation results of the target seabed organisms. If the movement speeds of the two are basically the same under the same drag force condition, and the sedimentation velocity scale, movement speed scale, incipient velocity scale and speed scale values are approximately the same, it can be considered that the differences in incipience of the simulation objects have little impact on the test results.

[0083] S303, if the movement parameters of the preset simulation object and the target seabed organism satisfy the seabed organism movement similarity criterion, then the preset simulation object is used as the simulation object of the target seabed organism.

[0084] S4, use the simulation object and the physical model to simulate the movement amount of the target seabed organisms in the nuclear power plant.

[0085] For the convenience of observation, regular waves are used to simulate the incident waves of the physical model. During the regular wave calibration test, the number of wave data collected at one time is controlled within 30 - 50 waves. The wave data is collected three times during the test, and the average value is taken as the representative value of the test results. The collection time interval is 0.02 s. The hydraulic conditions of the test are mainly controlled by a two-way tidal pump. The magnitude of the flow velocity is adjusted by controlling the rotation speed of the reversible pump. After multiple tests, the required average flow velocity is finally obtained. The collection and processing of data follow the "Technical Specification for Simulation Tests in Water Transport Engineering". During the test, the number of consecutive irregular waves adopted is greater than 120, the sampling time interval is 0.02 s, and each group of tests is repeated more than three times. The average value of the maximum value of each group is taken as the final result.

[0086] The steps of using the simulation object and the physical model to simulate the movement amount of the target seabed organisms in the nuclear power plant are as follows: calibrate measurement instruments such as flow velocity sensors and wave height gauges; arrange seabed organisms in the existing physical model test pool; observe the movement process of the seabed organisms under the action of waves and currents; close the tidal pump, and slowly drain the water in the pool, and count the movement amount of the seabed organism simulation objects.

[0087] If Figure 2The schematic diagram of a physical simulation device for the seabed biological transport effect in a nuclear power plant according to an embodiment of the present invention is shown. This physical simulation device is used to execute the above method, and the device includes: an acquisition module 21, a establishment module 22, a determination module 23, and a simulation module 24.

[0088] The acquisition module 21 is used to acquire the motion parameters of the target seabed organisms in the nuclear power plant.

[0089] The establishment module 22 is used to establish a physical model for simulating the seabed biological transport effect in the nuclear power plant.

[0090] The determination module 23 is used to determine the analog of the target seabed organisms based on the motion parameters of the target seabed organisms and the physical model.

[0091] The simulation module 24 is used to simulate the motion quantity of the target seabed organisms in the nuclear power plant by using the analog and the physical model.

[0092] It should be understood that the description of a physical simulation device for the seabed biological transport effect in a nuclear power plant is consistent with the corresponding embodiment of a physical simulation method for the seabed biological transport effect in a nuclear power plant. Therefore, this embodiment will not be elaborated here.

[0093] In summary, as can be seen from the above description, the above embodiments of the present invention achieve the following technical effects:

[0094] 1. By conducting a flume experiment on the motion law of the target seabed organisms in the nuclear power plant, the present invention acquires the motion parameters of the target seabed organisms in the nuclear power plant. Based on the basic information obtained from the flume experiment, a corresponding physical model is established according to the similarity criterion of the overall physical model experiment, and a corresponding analog is selected. In this way, it can be ensured that the motion process of the analog should be similar to the actual motion process of the target seabed organisms, avoiding the scale effect, and being able to overcome the phenomenon of distorted simulation results of the physical model caused by ignoring the large-scale flow field, providing a premise for accurately evaluating the risk of entrainment and plugging of benthic organisms.

[0095] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0096] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0097] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus or device), or used in conjunction with these instruction execution systems, apparatus or devices.

[0098] It should be understood that various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0099] It should be noted that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A physical simulation method for the undersea biological transport effect in a nuclear power plant, characterized in that Including: Obtaining the motion parameters of the target seabed organisms in a nuclear power plant; Establishing a physical model for simulating the transport effect of the seabed organisms in the nuclear power plant; Determining the analog of the target seabed organisms based on the motion parameters of the target seabed organisms and the physical model; Using the analog and the physical model to simulate the motion quantity of the target seabed organisms in the nuclear power plant.

2. The method according to claim 1, wherein Obtaining the motion parameters of the target seabed organisms in a nuclear power plant, including: Conducting a flume test on the target seabed organisms in the nuclear power plant to obtain the motion parameters of the target seabed organisms in the nuclear power plant, where the motion parameters include one or more of the individual mass, volume, body length, sinking velocity, critical starting friction velocity, critical starting vertical average velocity, starting wave height, and critical starting velocity of the target seabed organisms in the nuclear power plant.

3. The method according to claim 2, characterized in that, Conducting a flume test on the target seabed organisms in the nuclear power plant, including: conducting a basic physical property test, an individual sinking velocity physical model test, and a basic hydraulic characteristic test on the target seabed organisms in the nuclear power plant.

4. The method according to claim 3, wherein Conducting a basic physical property test on the target seabed organisms in the nuclear power plant, including: Measuring the individual mass and volume of the target seabed organisms in the nuclear power plant using an electronic scale and a measuring cylinder respectively to obtain the individual mass and volume of the target seabed organisms in the nuclear power plant.

5. The method according to claim 3, wherein Conducting an individual sinking velocity physical model test on the target seabed organisms in the nuclear power plant, including: Putting the target seabed organisms in the nuclear power plant into a preset test flume, observing and recording the sinking process of the target seabed organisms in the nuclear power plant to obtain the sinking velocity of the target seabed organisms in the nuclear power plant.

6. The method according to claim 3, characterized in that Conducting a basic hydraulic characteristic test on the target seabed organisms in the nuclear power plant, including: Under the action of a steady flow, conducting a starting velocity test on individual target seabed organisms with different masses in the nuclear power plant to determine the critical starting friction velocity and the critical starting vertical average velocity of the target seabed organisms in the nuclear power plant under the action of a steady flow; Under the action of waves alone, conducting a starting velocity test on individual target seabed organisms with different masses in the nuclear power plant to determine the critical starting velocity of the target seabed organisms in the nuclear power plant under the action of waves; Under the combined action of waves and flow, conducting a transport characteristic test on individual target seabed organisms with different masses in the nuclear power plant to determine the critical starting velocity of the target seabed organisms in the nuclear power plant under the combined action of waves and flow.

7. The method according to claim 1, characterized in that Establishing a physical model for simulating the transport effect of the seabed organisms in the nuclear power plant, including: Establishing a physical model for simulating the transport effect of the seabed organisms in the nuclear power plant according to the preset similarity criteria for water flow motion and the preset similarity criteria for wave motion.

8. The method according to claim 7, characterized in that, The preset similarity criteria for water flow motion include: Gravity similarity criterion where λ u is the velocity scale ratio in the u direction, λ v is the velocity scale ratio in the v direction, and λ h is the vertical scale ratio Drag similarity scale, λ c =(λ l / λ h ) 1 / 2 , where λ c is the drag scale, λ l is the horizontal scale, and λ h is the vertical scale; Time scale of water flow movement where λ t is the time scale of water flow movement; The vertical scale should satisfy that, where λ h is the vertical scale, V p is the characteristic velocity, h p is the water depth, and v is the kinematic viscosity.

9. The method according to claim 7, wherein The preset similarity criteria for wave motion include: Wave refraction similarity criterion, λ L = λ H = λ h , where λ L is the wavelength scale ratio, λ H is the wave height scale ratio, λ h is the vertical scale ratio; Wave steepness similarity criterion, wherein, is the wave steepness scale ratio; Similarity criterion for wave propagation velocity where λ T is the scale ratio of wave propagation velocity 10. The method according to claim 1, wherein Determining the analog of the target seabed organisms based on the motion parameters of the target seabed organisms and the physical model, including: Placing a preset analog in the physical model to obtain the motion parameters of the preset analog; Judging whether the motion parameters of the preset analog and the motion parameters of the target seabed organisms satisfy the similarity criteria for seabed organism motion; If the motion parameters of the preset analog satisfy the submarine organism motion similarity criterion with the motion parameters of the target submarine organism, then the preset analog is used as the analog of the target submarine organism.

11. The method according to claim 10, characterized in that, The submarine organism motion similarity criterion includes: Seabed organism starting similarity criterion: Among them, is the seabed organism starting flow velocity scale ratio, λ v is the seabed organism starting flow velocity; Similarity criterion for seabed organism settlement: λ w = λ v , where λ w is the sedimentation velocity scale of seabed organisms; Similarity criterion for the transport rate of benthic organisms: where is the scale ratio of the transport rate of benthic organisms, is the scale ratio of the movement speed of the target benthic organisms, λ n is the scale ratio of the habitat density of the target benthic organisms, is the scale ratio of the individual mass of benthic organisms.

12. The method according to any one of claims 1 to 11, characterized in that The target submarine organisms in the nuclear power plant include one or more of nereis, clam, and sea cucumber.

13. A physical simulation device for the undersea biological transport effect in a nuclear power plant, characterized in that, The device is used to execute the method described in any one of claims 1 to 12 above, and the device includes: An acquisition module, configured to acquire the motion parameters of the target submarine organisms in the nuclear power plant; A establishment module, configured to establish a physical model for simulating the transport effect of the submarine organisms in the nuclear power plant; A determination module, configured to determine the analog of the target submarine organism based on the motion parameters of the target submarine organism and the physical model; A simulation module, configured to use the analog and the physical model to simulate the motion amount of the target submarine organisms in the nuclear power plant.

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