A two-way poppet valve simulator

Abstract

The utility model discloses a kind of double-flow blasting valve simulators, belong to nuclear power commissioning flow resistance test technical field.The simulator includes tubular shell and the connecting flange of both ends thereof, and its core improvement is in that shell middle section is provided with the inner tube of length not less than 1 / 3 of shell total length, the inner diameter of this inner tube forms minimum through-flow area, and its surface is asymmetrically provided with groove along axial direction.This structure simulates the non-uniform, turbulent flow field generated after real blasting valve opening by asymmetric groove, effectively overcomes the problem of large simulation error caused by traditional simulator only relying on cross-sectional area change to adjust flow resistance.The utility model can more accurately reproduce the actual flow resistance characteristics of blasting valve, significantly improve the accuracy and reliability of flow parameter measurement in the commissioning phase of nuclear power plant safety system.

Description

Technical Field

[0001] This utility model relates to a flow resistance simulation device, and more particularly to a dual-flow burst valve simulation device. Background Technology

[0002] The rupture valve flow resistance simulator is a test device used during the commissioning phase of a passive core cooling system in a nuclear power plant. Its function is to simulate the flow resistance characteristics of a real rupture valve in the pipeline without damaging it, and to accurately measure the flow parameters of the pipeline. Since the real rupture valve is a one-time opening device during nuclear power plant operation and cannot be reused during commissioning, the flow resistance simulator, with the same structural dimensions and equivalent flow resistance performance, replaces the real valve in the test pipeline, ensuring the integrity and sealing of the pipeline system, while simultaneously measuring the flow resistance of the safety injection line.

[0003] As shown in Chinese patent (CN111933319B), this type of simulation component is typically formed by integral forging. Its internal design includes multiple sections of tapering and expanding structures, as well as a minimum flow passage. Smooth transition surfaces prevent abrupt changes in the flow field, ensuring the accuracy and stability of measurements. Its application not only improves the economy and efficiency of the commissioning process and reduces the investment and replacement frequency of temporary equipment, but also provides reliable data support for verifying the safe injection and recirculation capabilities of nuclear power plants under severe accident conditions, filling the technological gap in non-standard flow measurement devices in the field of nuclear power commissioning. However, the actual bursting effect of the rupture valve still varies. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem that existing explosion valve simulation components rely on the size of the flow channel cross-sectional area to adjust the flow resistance. However, the actual explosion effect of the explosion valve is not uniform, which leads to a relatively large error in the simulation effect in more refined tests.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A dual-flow burst valve simulator includes a tubular shell with an internal flow channel. Connecting flanges are provided at both ends of the tubular shell. An inner cylinder is provided inwardly in the middle section of the tubular shell. The inner diameter of the inner cylinder forms a minimum flow surface. The diameter between the inner cylinder and the end of the tubular shell gradually increases from the inside out. The length of the inner cylinder is ≥ 1 / 3 of the length of the tubular shell. Grooves are formed on the surface of the inner cylinder along the axial direction of the tubular shell. These grooves are asymmetrically arranged within the tubular shell. Pressure tapping holes are formed radially within the tubular shell.

[0006] As a preferred technical solution, the groove is helical, and its helix angle and / or helix depth are set non-linearly along the fluid flow direction.

[0007] As a preferred technical solution, the groove is a streamlined curve that runs through the length of the inner cylinder, and the end of the groove smoothly transitions to the end of the inner cylinder.

[0008] As a preferred technical solution, a number of protrusions are provided on the inner side of the trench, the protrusions at least partially closing the trench, and the fluid forms turbulence when flowing through the closed trench.

[0009] As a preferred technical solution, the pressure tapping hole is opened at least one in the end and / or middle section of the inner cylinder, and at least one pressure tapping hole is connected to the inner side of the groove.

[0010] The advantages and beneficial effects of this invention are as follows: Through asymmetrically arranged spiral grooves and internal protrusions, it effectively simulates the non-uniform flow characteristics during the actual explosion of a burst valve, overcoming the error problem caused by traditional simulation components that rely solely on adjusting flow resistance based on the cross-sectional area of ​​the flow channel. The spiral angle and depth of the grooves change non-linearly along the fluid direction, combined with the turbulence generation mechanism within the grooves, enabling a more realistic reproduction of complex flow field conditions, thereby improving the accuracy and stability of flow resistance measurement. This provides more reliable data support for the commissioning of nuclear power plant safety injection systems, while reducing testing costs and time. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the longitudinal section structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model; Figure label: 1-Tube shell, 2-Connecting flange, 3-Inner cylinder, 4-Minimum flow surface, 5-Groove, 6-Pressure tapping hole, 7-Protrusion. Detailed Implementation

[0012] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0013] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0014] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly or implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0015] Please see Figures 1-2 This embodiment provides a dual-flow burst valve simulator, including a tubular shell 1 with an internal flow channel. Connecting flanges 2 are located at both ends of the tubular shell 1. An inner cylinder 3 is located inwards from the middle section of the tubular shell 1. The inner diameter of the inner cylinder 3 forms a minimum flow surface 4. The diameter between the inner cylinder 3 and the end of the tubular shell 1 gradually increases from the inside out. The length of the inner cylinder 3 is ≥ 1 / 3 of the length of the tubular shell 1. Grooves 5 are formed on the surface of the inner cylinder 3 along the axial direction of the tubular shell 1, and the grooves 5 are asymmetrically arranged within the tubular shell 1. Pressure taps 6 are radially formed on the tubular shell 1. When fluid flows through the inner cylinder 3, the minimum flow surface 4 generates a throttling effect, and the asymmetrical grooves 5 disturb the flow field, forming non-uniform turbulence, simulating the flow characteristics of a real burst valve. The gradient diameter expansion structure reduces abrupt flow changes, and the pressure taps 6 are used to measure pressure differences, thereby more accurately reproducing the actual flow resistance and reducing simulation errors.

[0016] As an explanation, the specific location of the groove 5 is set according to the bidirectional flow characteristics of the simulation component. Specifically, when the fluid flows inside the tubular shell, the dense area or initial phase of the spiral groove 5 is biased towards the surface of the inner cylinder 3 near end A; when the flow direction is reversed, the same groove 5 layout, due to its asymmetry, will generate a vortex pattern different from the forward flow in the flow from end B to end A. A single simulation component can generate turbulence in both forward and reverse bidirectional flow tests, and can faithfully simulate the complex flow field after a real burst valve opens, even under pressure differences at both ends.

[0017] The circumferential distribution density and axial position of the grooves 5 on the surface of the inner cylinder 3 are determined based on the expected development trajectory of the main vortex and the distribution of turbulent kinetic energy in the target flow field. When simulating a specific flow direction, the dense region of the grooves 5 and a specific spiral phase are arranged in a specific quadrant of the inner cylinder 3 circumferentially. This position corresponds to the mainstream shear layer separation region induced by asymmetric explosion after the actual burst valve is opened. When the fluid flows through this region, the velocity gradient generated between it and the low-velocity flow near the wall is effectively simulated under the continuous perturbation of the grooves 5, thereby directionally generating a vortex structure that conforms to the real physical process.

[0018] To optimize the perturbation effect of the groove 5 on the flow field and enhance the realism of turbulence simulation, the technical solution provided in this embodiment is as follows: the groove 5 is helical, and its helix angle and / or helix depth are non-linearly set along the fluid flow direction. The helical groove 5 guides the fluid to generate rotational flow, and the non-linearly changing helix angle and depth cause the degree of flow field perturbation to gradually change with the flow direction; the fluid experiences acceleration and deceleration within the helical groove 5, forming a vortex structure, simulating the unsteady flow state after the burst valve is opened, thus improving the accuracy and stability of the flow resistance characteristic simulation.

[0019] Specifically, the helix angle of the spiral groove 5 is set to 15° to 20° at the fluid inlet end and gradually increases to 25° to 30° at the outlet end along the flow direction; at the same time, the depth of the groove 5 gradually changes nonlinearly from 1.5mm at the inlet end to 2.5mm at the outlet end, and the groove width changes accordingly from 3mm to 4mm.

[0020] To ensure a smooth transition between the groove 5 and the flow field, and to reduce flow separation and energy loss, the technical solution provided in this embodiment is as follows: the groove 5 extends along the length of the inner cylinder 3 in a streamlined curve on the surface of the inner cylinder 3, with a smooth transition between the end of the groove 5 and the end of the inner cylinder 3. The smooth connection between the end of the streamlined groove 5 and the end of the inner cylinder 3 avoids abrupt changes in the flow field caused by sharp edges; when the fluid flows along the curve of the groove 5, the smooth transition reduces local resistance loss, making turbulence generation more natural, further approximating the flow field distribution of a real burst valve, and improving the reliability of measurement data.

[0021] Specifically, the streamlined curve is preferably a part of an Archimedean spiral or an elliptical arc, with its curvature changing continuously.

[0022] Preferably, the grooves 5 and protrusions 7 on the inner cylinder 3 are machined using specialized machining methods, such as deep-hole spiral boring technology similar to gun barrel boring. Preferably, boring or broaching can be performed axially from both ends of the dual-flow rupture valve simulator. By controlling the tool path and cutting depth, some unmachined material is left in the grooves 5 to form the protrusions 7. The protrusions 7 partially obstruct the flow channels of the grooves 5, causing flow around and separation as the fluid flows through, forming small-scale eddies. These eddies interact with the main flow, exacerbating the non-uniformity of the flow and the intensity of turbulence, more realistically reproducing the complex flow field conditions at the moment of rupture valve explosion, effectively overcoming the shortcomings of traditional simulators that rely solely on cross-sectional area adjustment.

[0023] To generate local turbulence within the trench 5 and enhance the simulation of non-uniform flow field, the technical solution provided in this embodiment is as follows: several protrusions 7 are left on the inner side of the trench 5, which at least partially close the trench 5. The protrusions 7 partially block the flow channel of the trench 5, causing flow around and separation of the fluid as it flows through, forming small-scale eddies; these eddies interact with the main flow to reproduce the complex flow field at the moment of the burst valve's explosion.

[0024] Specifically, the protrusion 7 is hemispherical or rectangular, with a height of 1 / 3 to 1 / 2 of the groove depth and a width of 1 / 2 to 2 / 3 of the groove width, and is evenly distributed along the length of the groove at intervals (approximately 2 to 3 times the groove width). The protrusion 7 is formed by reserving material during processing, partially closing the groove flow channel, causing the fluid to flow around and separate as it passes through.

[0025] To accurately measure pressure changes as the flow passes through the simulation component and support flow resistance calculation, this embodiment provides the following technical solution: pressure taps 6 are located at least one location at the end and / or middle section of the inner cylinder 3. The pressure taps 6 are situated at key locations in the flow field, such as near the minimum flow surface 4 or in turbulent regions, and are used to collect static or dynamic pressure data. Pressure data is transmitted to external measuring equipment via the pressure taps 6, and the flow resistance value is calculated in conjunction with flow parameters, ensuring the accuracy and reliability of flow parameter measurements during the commissioning phase.

[0026] To directly obtain the flow pressure inside the trench 5 and monitor turbulence effects, the technical solution provided in this embodiment is as follows: at least one pressure tap 6 is connected to the inner side of the trench 5. The pressure tap 6 communicates with the inside of the trench 5, directly sensing pressure fluctuations within the trench 5; the fluid in the trench 5 experiences pressure pulsations due to the influence of protrusions 7 or asymmetric structures, and the pressure tap 6 captures these signals, providing more detailed flow field data, which helps in analyzing turbulence characteristics and improving the data support quality for the commissioning of nuclear power plant safety systems. The diameter of the pressure tap 6 is 1mm to 2mm, and it is connected to an external pressure sensor via a thread.

[0027] It should be noted that the specific location, distribution density, and helical phase of the groove 5 can be determined based on the transient fluid dynamics (CFD) simulation results and particle image velocimetry (PIV) experimental data of the actual burst valve opening process. Through large eddy simulation (LES) analysis of the flow field after the prototype burst valve, its flow characteristics, such as the location and intensity of the high-speed jet region, the mainstream shear layer, and the vortex region, are extracted. Based on this flow field topology, the surface of the inner cylinder 3 is divided into functional areas with different disturbance intensities, and grooves 5 with different densities, depths, and helical angles are set in the corresponding areas. This allows the simulated component to actively generate momentum exchange and vortex structures that match the corresponding positions, thereby statistically reproducing the core turbulence characteristics and total pressure loss mechanism of the prototype flow field.

[0028] The working principle of this invention is as follows: When fluid flows in from one end of the tubular shell 1, it enters the flow channel through the connecting flange 2, and first undergoes a gradient expansion section to accelerate its flow towards the inner cylinder 3. In the inner cylinder 3 section, the minimum flow surface 4 generates a throttling effect, while the asymmetrically arranged spiral grooves 5 disturb the fluid, forming a rotating and non-uniform turbulent flow, simulating the flow state after the actual rupture valve is opened. The protrusions 7 in the grooves 5 further generate vortices, increasing the complexity of the flow field. Pressure taps 6 collect pressure data at key locations for calculating flow resistance characteristics. Throughout the process, through the synergistic effect of the inner cylinder 3 length, the asymmetry of the grooves, and the turbulence mechanism, the actual flow resistance performance of the rupture valve is accurately reproduced, providing a reliable and efficient testing method for the commissioning of the nuclear power plant's safety injection system.

[0029] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A dual-flow burst valve simulator, comprising a tubular housing (1) internally configured as a flow channel, wherein connecting flanges (2) are respectively provided at both ends of the tubular housing (1), characterized in that, The tubular shell (1) has an inner cylinder (3) inwardly arranged in the middle section. The inner diameter of the inner cylinder (3) forms a minimum flow surface (4). The diameter between the inner cylinder (3) and the end of the tubular shell (1) increases gradually from the inside to the outside. The length of the inner cylinder (3) is ≥ 1 / 3 of the length of the tubular shell (1). The surface of the inner cylinder (3) is provided with grooves (5) along the axial direction of the tubular shell (1). The grooves (5) are asymmetrically arranged in the tubular shell (1). The tubular shell (1) is provided with pressure tapping holes (6) in the radial direction.

2. The dual-flow burst valve simulator according to claim 1, characterized in that, The groove (5) is helical, and its helix angle and / or helix depth are non-linearly set along the fluid flow direction.

3. A dual-flow burst valve simulator according to claim 1 or 2, characterized in that, The groove (5) extends through the inner cylinder (3) in a streamlined curve on the surface of the inner cylinder (3), and the end of the groove (5) smoothly transitions to the end of the inner cylinder (3).

4. A dual-flow burst valve simulator according to claim 1, characterized in that, The groove (5) has several protrusions (7) on its inner side, which at least partially close the groove (5).

5. A dual-flow burst valve simulator according to claim 1, characterized in that, The pressure tapping hole (6) is located at least once in the end and / or middle section of the inner cylinder (3).

6. A dual-flow burst valve simulator according to claim 5, characterized in that, At least one of the pressure taps (6) is connected to the inside of the groove (5).

Images