Reactor core simulation body and pressure guiding device

Abstract

The invention provides a reactor core simulator and a pressure guiding device. The reactor core simulation body comprises a pressure vessel, and a plurality of first through holes penetrating through the pressure vessel are formed in the side wall of the pressure vessel; the inner cylinder body is arranged in the pressure container, the side wall of the inner cylinder body and the side wall in the pressure container are arranged at intervals, and a plurality of second through holes penetrating through the inner cylinder body are formed in the side wall of the inner cylinder body; each pressure guiding device comprises a connecting piece, a positioning pipe and a pressure guiding pipe, the connecting pieces are located in the pressure container and arranged on the outer side wall of the inner barrel, the connecting pieces are annularly arranged on the peripheral side of the second through hole in a one-to-one correspondence mode, the positioning pipes and the pressure guiding pipes extend in the first direction, inlets of the pressure guiding pipes penetrate through the positioning pipes and extend into the connecting pieces, and outlets of the pressure guiding pipes extend into the connecting pieces; and an inlet of the pressure guide pipe is communicated with the second through hole, so that a gas-liquid two-phase mixture in the cylinder can be introduced into the pressure guide pipe through the second through hole. The pressure drawing device of the reactor core simulation body has the advantages of convenience in pressure taking and high measurement accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power, and in particular to a core simulation body and a pressure-inducing device. Background Art

[0002] The large break accident is a design basis accident for nuclear power plants and one of the key accidents that nuclear power plant safety analysis software needs to analyze. When a large break accident occurs, the core fluid will quickly present a two-phase state due to the reduction of coolant, reduced flow rate, system pressure reduction, etc. The analysis and research of the two-phase flow and heat exchange phenomena in the core of a typical pressurized water reactor and the accurate measurement of related parameters are the key to obtaining data to support the verification and promotion of domestic nuclear power design safety analysis software. The core simulation body is a tool for nuclear reactor physics and thermal hydraulic analysis, mainly used to simulate various physical processes in the core of a nuclear reactor. The core simulation body is a high-temperature and high-pressure pressure vessel with an annular cavity. When measuring the cavitation fraction of the two-phase flow in the cavity of the pressure vessel with complex internal components, the relevant technology mainly uses the differential pressure measurement method. How to successfully take pressure in the internal parts of the high-pressure vessel to ensure that there is no leakage inside and outside, how to minimize the pressure loss of the lead pipe, and how to reduce the measurement error caused by the accumulation of cavitation in the lead pipe are the keys to accurate measurement. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a core simulation body and a pressure-inducing device.

[0004] The core simulation body of the embodiment of the present invention comprises:

[0005] A pressure container, wherein a side wall of the pressure container has a plurality of first through holes extending therethrough, and the plurality of first through holes are spaced apart in a vertical direction;

[0006] An inner cylinder, wherein the inner cylinder is disposed in the pressure vessel, a side wall of the inner cylinder is spaced apart from a side wall of the pressure vessel, and the side wall of the inner cylinder has a plurality of second through holes penetrating therethrough, the plurality of second through holes are spaced apart in the up-down direction, and the plurality of second through holes correspond one-to-one to the plurality of first through holes in the first direction;

[0007] A plurality of pressure-inducing devices, each of the pressure-inducing devices comprises a connecting piece, a positioning tube and a pressure-inducing tube, the connecting piece is located in the pressure vessel and is arranged on the outer side wall of the inner cylinder, the plurality of connecting pieces are arranged one by one on the outer peripheral side of the second through hole, the plurality of positioning tubes are arranged on the outer side wall of the pressure vessel, the plurality of positioning tubes are arranged one by one on the outer peripheral side of the first through hole, the positioning tube and the pressure-inducing tube both extend along the first direction, the inlet of the pressure-inducing tube passes through the positioning tube and extends into the connecting piece, the inlet of the pressure-inducing tube is connected with the second through hole so that the gas-liquid two-phase mixture in the cylinder can pass into the pressure-inducing tube through the second through hole.

[0008] Therefore, the pressure-drawing device for the core simulation body according to the embodiment of the present invention has the advantages of convenient pressure measurement and high measurement accuracy.

[0009] In some embodiments, the core simulation body includes a detection unit, and the detection unit includes a differential pressure transmitter. Each of the differential pressure transmitters is used to measure the pressure difference of the liquid discharged from two adjacent pressure-inducing pipes in the upper and lower directions.

[0010] In some embodiments, there are multiple detection units, each of which includes one differential pressure transmitter and two gas-water separators, each of which has a two-phase flow inlet, a gas outlet and a liquid single-phase outlet, and the gas outlet, the two-phase flow inlet and the liquid single-phase outlet are arranged in sequence from top to bottom, and the two pressure measuring ports of each differential pressure transmitter are respectively connected to the liquid single-phase outlets of the two gas-water separators through pipelines, and the two gas-water separators of each detection unit are respectively connected to the outlets of two adjacent pressure pipes in the up and down directions.

[0011] In some embodiments, the gas-water separator comprises, from top to bottom, an upper top plate, an annular body and a lower bottom plate connected in sequence, the gas-water separator is made of metal material, the annular body extends in the up and down directions, the two-phase flow inlet is opened at the lower part of the annular body, the upper top plate covers the upper opening of the annular body, the gas outlet is opened on the upper top plate, at least part of the gas outlet is a conical hole with an inner diameter increasing from top to bottom, the lower bottom plate covers the lower opening of the annular body, and the liquid single-phase outlet is opened on the lower bottom plate.

[0012] In some embodiments, a thread is formed on the inner side of the connecting piece, and the pressure-inducing tube is threadedly connected to the connecting piece.

[0013] In some embodiments, a sealing member for sealing a gap between the positioning tube and the pressure-inducing tube is provided on the pressure-inducing tube.

[0014] In some embodiments, a sealing platform is provided on the outer peripheral side of one end of the positioning tube away from the pressure vessel, and the sealing member includes a sealing ring and a sealing gasket, the sealing ring and the sealing gasket are sleeved on the pressure-leading tube, the sealing gasket is located between the sealing platform and the sealing ring, and the sealing ring is threadedly connected to the sealing platform.

[0015] In some embodiments, the connecting piece is welded to the outer side wall of the inner cylinder;

[0016] The positioning tube is welded to the outer side wall of the pressure vessel;

[0017] The pressure-resistant strength of the pressure-guiding pipe is greater than or equal to 8 MPa.

[0018] In some embodiments, the diameter of the second through hole is greater than or equal to 0.5 mm and less than or equal to 1.5 mm;

[0019] A step hole is provided at the inlet of the pressure-inducing pipe, and the diameter of at least part of the step hole decreases in the first direction along a direction adjacent to the second through hole, and the diameter of the step hole is greater than or equal to the diameter of the second through hole.

[0020] The present invention also proposes a pressure-inducing device, including a connecting piece, a positioning tube and a pressure-inducing tube, the connecting piece is used to be arranged on the outer side wall of an inner cylinder in a pressure vessel, the connecting piece is used to be arranged in a ring on the outer peripheral side of a second through hole of the inner cylinder, the positioning tube is arranged on the outer side wall of the pressure vessel, the positioning tube is arranged in a ring on the outer peripheral side of a first through hole of the pressure vessel, the positioning tube and the pressure-inducing tube both extend along a first direction, the inlet of the pressure-inducing tube passes through the positioning tube and extends into the connecting piece, the inlet of the pressure-inducing tube is connected with the second through hole so that a gas-liquid two-phase mixture in the inner cylinder can pass through the second through hole into the pressure-inducing tube, a sealing platform is provided on the outer peripheral side of an end of the positioning tube away from the pressure vessel, a sealing ring and a sealing gasket are sleeved on the outer peripheral side of the pressure-inducing tube, the sealing gasket is located between the sealing platform and the sealing ring, and the sealing ring is threadedly connected to the sealing platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a core simulation body according to an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of a pressure-inducing device according to an embodiment of the present invention.

[0023] Figure 3 Schematic diagram of a gas-water separator according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] 1. a pressure vessel, 11. a first through hole;

[0026] 2. inner cylinder, 21. second through hole;

[0027] 31. Connecting piece, 32. Positioning tube, 33. Pressure-guiding tube, 34. Sealing platform, 35. Sealing ring;

[0028] 4. differential pressure transmitter, 41. gas-water separator, 42. upper top plate, 43. annular body, 44. lower bottom plate, 45. two-phase flow inlet, 46. gas outlet, 47. liquid single-phase outlet. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] The following describes the core simulation of the embodiment of the present invention with reference to the accompanying drawings. Figures 1 to 3 As shown, the core simulation body according to an embodiment of the present invention includes a pressure vessel 1, an inner cylinder 2 and a plurality of pressure-inducing devices.

[0031] The side wall of the pressure vessel 1 has a plurality of first through holes 11 penetrating therethrough, and the plurality of first through holes 11 are arranged at intervals in the vertical direction. Specifically, the pressure vessel 1 is used to bear pressure, and the pressure vessel 1 is the shell of the core simulation body.

[0032] The inner cylinder 2 is arranged in the pressure vessel 1, and the side wall of the inner cylinder 2 is arranged at intervals from the side wall of the pressure vessel 1, and the side wall of the inner cylinder 2 has a plurality of second through holes 21 penetrating therethrough. The plurality of second through holes 21 are arranged at intervals in the up-down direction, and the plurality of second through holes 21 correspond one-to-one with the plurality of first through holes 11 in the first direction. Specifically, the side wall of the pressure vessel 1 is arranged around the inner cylinder 2 and is spaced apart from the inner cylinder 2, and the inner cylinder 2 is provided with devices such as fuel rods, and the inner cylinder 2 has a gas-liquid two-phase fluid. The first direction may be a left-right direction. For example, the plurality of second through holes 21 correspond one-to-one with the plurality of first through holes 11 in the left-right direction.

[0033] The diameter of the second through hole 21 is greater than or equal to 0.5 mm and less than or equal to 1.5 mm. For example, the diameter of the second through hole 21 is 1 mm.

[0034] Each pressure-inducing device includes a connecting piece 31 , a positioning tube 32 and a pressure-inducing tube 33 .

[0035] like Figure 1 and Figure 2As shown, the connecting member 31 is located in the pressure vessel 1 and is arranged on the outer side wall of the inner cylinder 2. A plurality of connecting members 31 are arranged one by one around the outer circumference of the second through hole 21. Specifically, the connecting member 31 is an annular structure, the connecting member 31 is welded on the outer side wall of the inner cylinder 2, the connecting member 31 has a through hole extending along the first direction, and a thread is arranged in the through hole of the connecting member 31. The through hole of each of the connecting members 31 is located around the corresponding second through hole 21.

[0036] A plurality of positioning tubes 32 are arranged on the outer wall of the pressure vessel 1, and the plurality of positioning tubes 32 are arranged one by one around the outer peripheral side of the first through hole 11. The positioning tubes 32 are welded to the outer wall of the pressure vessel 1 so that there is no gap between the positioning tubes 32 and the outer wall of the pressure vessel 1. The positioning tubes 32 and the pressure-inducing tube 33 both extend in the first direction, and the inner diameter of the positioning tube 32 matches the outer diameter of the pressure-inducing tube 33. The positioning tube 32 is used to position the pressure-inducing tube 33. For example, the positioning tube 32 and the pressure-inducing tube 33 both extend in the left-right direction.

[0037] The inlet of the pressure-inducing pipe 33 passes through the positioning pipe 32 and extends into the connector 31. The inlet of the pressure-inducing pipe 33 is connected to the second through hole 21 so that the gas-liquid two-phase mixture in the cylinder can pass through the second through hole 21 into the pressure-inducing pipe 33. Specifically, the inner side of the connector 31 is provided with threads, the pressure-inducing pipe 33 is threadedly connected to the connector 31, and the inlet of the pressure-inducing pipe 33 passes through the positioning pipe 32 and then extends into the connector 31. The pressure-inducing pipe 33 is rotated so that the pressure-inducing pipe 33 is threadedly connected to the connector 31, so that the second through hole 21 can be connected to the pressure-inducing pipe 33. Thus, the pressure or pressure difference at different heights can be measured by the fluid discharged from the pressure-inducing pipe 33. For example, a sealing material is applied to the gap between the pressure-inducing pipe 33 and the connector 31 to further increase the sealing performance.

[0038] like Figure 1 and Figure 2 As shown, in some embodiments, a seal for sealing the gap between the positioning tube 32 and the pressure tube 33 is provided on the pressure tube 33. Specifically, a sealing platform 34 is provided on the outer peripheral side of the end of the positioning tube 32 away from the pressure vessel 1, and the seal includes a sealing ring 35 and a sealing gasket, which are sleeved on the pressure tube 33, and the sealing gasket is located between the sealing platform 34 and the sealing ring 35, and the sealing ring 35 is threadedly connected to the sealing platform 34. As a result, after the sealing ring 35 is connected to the sealing platform 34, the sealing gasket can block the gap between the positioning tube 32 and the pressure tube 33. For example, the sealing ring 35 has an internal thread, the sealing platform 34 has an external thread, a part of the sealing platform 34 can enter the sealing ring 34, and after the sealing ring 34 is rotated, the sealing ring 34 can be threadedly connected to the sealing platform 34.

[0039] In some embodiments, the pressure-resistant strength of the pressure-inducing pipe 33 is greater than or equal to 8 MPa, so that the pressure-inducing pipe 33 can withstand pressure.

[0040] In some embodiments, a step hole is provided at the inlet of the lead pressure tube 33 , and the diameter of at least part of the step hole decreases in the first direction along the direction adjacent to the second through hole 21 , and the diameter of the step hole is greater than or equal to the diameter of the second through hole 21 .

[0041] like Figures 1 to 3 As shown, in some embodiments, the core simulation body includes a detection unit, and the detection unit includes a differential pressure transmitter 4, each of which is used to measure the pressure difference of the liquid discharged from two adjacent pressure-inducing pipes 33 in the vertical direction. Therefore, multiple differential pressure transmitters 4 can be used to monitor the pressure difference of the liquid discharged from two adjacent pressure-inducing pipes 33 in the vertical direction.

[0042] In some embodiments, there are multiple detection units, and each detection unit includes a differential pressure transmitter 4 and two gas-water separators 41 .

[0043] Each gas-water separator 41 has a two-phase flow inlet 45, a gas outlet 46 and a liquid single-phase outlet 47, and the gas outlet 46, the two-phase flow inlet 45 and the liquid single-phase outlet 47 are arranged in sequence from top to bottom. The two pressure measuring ports (pressure measuring points) of each differential pressure transmitter 4 are respectively connected to the liquid single-phase outlets 47 of the two gas-water separators 41 through pipelines, and the two gas-water separators 41 of each detection unit are respectively connected to the outlets of two adjacent pressure-inducing pipes 33 in the upper and lower directions. Therefore, after the gas-liquid two-phase mixture discharged from the pressure-inducing pipe 33 enters the gas-water separator 41 through the two-phase flow inlet 45, the gas in the gas-water separator 41 is discharged from the gas outlet 46, and the liquid in the gas-water separator 41 is discharged from the liquid single-phase outlet 47. The two pressure measuring ports (pressure measuring points) of the differential pressure transmitter 4 respectively measure the liquid pressure at the liquid single-phase outlet 47 of the gas-water separator 41 through pipelines to measure the pressure difference.

[0044] like Figure 3 As shown, the gas-water separator 41 includes, from top to bottom, an upper top plate 42 , an annular main body 43 and a lower bottom plate 44 which are connected in sequence.

[0045] The gas-water separator 41 (upper top plate 42, annular body 43 and lower bottom plate 44) is made of metal material, and the annular body 43 extends in the up-down direction. A two-phase flow inlet 45 is provided at the lower part of the annular body 43, the upper top plate 42 covers the upper opening of the annular body 43, a gas outlet 46 is provided on the upper top plate 42, at least part of the gas outlet 46 is a tapered hole with an increasing inner diameter from top to bottom, the lower bottom plate 44 covers the lower opening of the annular body 43, and a liquid single-phase outlet 47 is provided on the lower bottom plate 44. For example, the gas-water separator 41 is made of steel material, and the annular body 43 is a circular ring. The gas outlet 46 penetrates the upper top plate 42 in the up-down direction, and the liquid single-phase outlet 47 penetrates the lower bottom plate 44 in the up-down direction.

[0046] The present invention further provides a pressure-inducing device, which is a pressure-inducing device on a core simulation body according to an embodiment of the present invention. Specifically, the pressure-inducing device on a core simulation body according to an embodiment of the present invention comprises a connector 31 , a positioning tube 32 and a pressure-inducing tube 33 .

[0047] The connecting piece 31 is used to be arranged on the outer wall of the inner cylinder 2 in the pressure vessel 1, and the connecting piece 31 is used to be arranged around the outer peripheral side of the second through hole 21 of the inner cylinder 2. The positioning tube 32 is arranged on the outer wall of the pressure vessel 1, and the positioning tube 32 is arranged around the outer peripheral side of the first through hole 11 of the pressure vessel 1. The positioning tube 32 and the pressure-inducing tube 33 both extend along the first direction. The inlet of the pressure-inducing tube 33 passes through the positioning tube 32 and extends into the connecting piece 31. The inlet of the pressure-inducing tube 33 is connected with the second through hole 21 so that the gas-liquid two-phase mixture in the inner cylinder 2 can pass into the pressure-inducing tube 33 through the second through hole 21. A sealing platform 34 is provided on the outer peripheral side of the end of the positioning tube 32 away from the pressure vessel 1, and a sealing ring 35 and a sealing gasket are sleeved on the outer peripheral side of the pressure-inducing tube 33. The sealing gasket is located between the sealing platform 34 and the sealing ring 35, and the sealing ring 35 is threadedly connected to the sealing platform 34.

[0048] The pressure-drawing pipe 33 of the pressure-drawing device of the core simulation body according to the embodiment of the present invention passes through two layers of cylinders (pressure vessel 1 and inner cylinder 2), so that the pressure-drawing pipe 33 can be pressurized under the high temperature and high pressure conditions of the core simulation body, and the pressure-drawing is guaranteed to be leak-proof through different fixing and sealing means, and the pressure-drawing device can realize pressure-drawing in the inner part of the high-pressure container (pressure vessel 1), ensuring that there is no leakage inside and outside. Then the gas-water separator 41 is passed to separate the gas and liquid, and the gas discharged from the pressure-drawing pipe 33 can be discharged in time, reducing the measurement error caused by gas collection in the pressure-drawing pipe 33 and improving the accuracy of the measurement. Therefore, the core simulation body according to the embodiment of the present invention can be used for measuring the cavitation fraction of the cross section of the core rod bundle under a large breach accident, providing important support for the core two-phase flow research and core heat transfer research under the prototype accident conditions.

[0049] Therefore, the pressure-drawing device for the core simulation body according to the embodiment of the present invention has the advantages of convenient pressure measurement and high measurement accuracy.

[0050] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction 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 described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A core simulation body, characterized in that: include: A pressure container, wherein a side wall of the pressure container has a plurality of first through holes extending therethrough, and the plurality of first through holes are spaced apart in a vertical direction; An inner cylinder, wherein the inner cylinder is disposed in the pressure vessel, a side wall of the inner cylinder is spaced apart from a side wall of the pressure vessel, and the side wall of the inner cylinder has a plurality of second through holes penetrating therethrough, the plurality of second through holes are spaced apart in the up-down direction, and the plurality of second through holes correspond one-to-one to the plurality of first through holes in the first direction; A plurality of pressure-inducing devices, each of the pressure-inducing devices comprises a connecting piece, a positioning tube and a pressure-inducing tube, the connecting piece is located in the pressure vessel and is arranged on the outer side wall of the inner cylinder, the plurality of connecting pieces are arranged one by one on the outer peripheral side of the second through hole, the plurality of positioning tubes are arranged on the outer side wall of the pressure vessel, the plurality of positioning tubes are arranged one by one on the outer peripheral side of the first through hole, the positioning tube and the pressure-inducing tube both extend along the first direction, the inlet of the pressure-inducing tube passes through the positioning tube and extends into the connecting piece, the inlet of the pressure-inducing tube is connected with the second through hole so that the gas-liquid two-phase mixture in the cylinder can pass into the pressure-inducing tube through the second through hole.

2. The core simulation body according to claim 1, characterized in that: The core simulation body includes a detection unit, and the detection unit includes a differential pressure transmitter. Each of the differential pressure transmitters is used to measure the pressure difference of liquid discharged from two adjacent pressure-inducing pipes in the upper and lower directions.

3. The core simulation body according to claim 2, characterized in that: There are multiple detection units, each of which includes a differential pressure transmitter and two gas-water separators. Each gas-water separator has a two-phase flow inlet, a gas outlet and a liquid single-phase outlet. The gas outlet, the two-phase flow inlet and the liquid single-phase outlet are arranged in sequence from top to bottom. The two pressure measuring ports of each differential pressure transmitter are respectively connected to the liquid single-phase outlets of the two gas-water separators through pipelines, and the two gas-water separators of each detection unit are respectively connected to the outlets of two adjacent pressure pipes in the upper and lower directions.

4. The core simulation body according to claim 3, characterized in that: The gas-water separator comprises, from top to bottom, an upper top plate, an annular body and a lower bottom plate which are connected in sequence. The gas-water separator is made of metal material. The annular body extends in the up-down direction. The two-phase flow inlet is opened at the lower part of the annular body. The upper top plate covers the upper opening of the annular body. The gas outlet is opened on the upper top plate. At least part of the gas outlet is a conical hole with an increasing inner diameter from top to bottom. The lower bottom plate covers the lower opening of the annular body. The liquid single-phase outlet is opened on the lower bottom plate.

5. The core simulation body according to any one of claims 1 to 4, characterized in that: The inner side of the connecting piece is provided with threads, and the pressure-inducing tube is threadedly connected to the connecting piece.

6. The core simulation body according to claim 5, characterized in that: The pressure-inducing tube is provided with a sealing member for sealing the gap between the positioning tube and the pressure-inducing tube.

7. The core simulation body according to claim 6, characterized in that: A sealing platform is provided on the outer peripheral side of one end of the positioning tube away from the pressure vessel. The sealing member includes a sealing ring and a sealing gasket. The sealing ring and the sealing gasket are sleeved on the pressure-leading tube. The sealing gasket is located between the sealing platform and the sealing ring. The sealing ring is threadedly connected to the sealing platform.

8. The core simulation body according to claim 6, characterized in that: The connecting piece is welded to the outer side wall of the inner cylinder; The positioning tube is welded to the outer side wall of the pressure vessel; The pressure-resistant strength of the pressure-guiding pipe is greater than or equal to 8 MPa.

9. The core simulation body according to claim 1, characterized in that: The diameter of the second through hole is greater than or equal to 0.5 mm and less than or equal to 1.5 mm; A step hole is provided at the inlet of the pressure-inducing pipe, and the diameter of at least part of the step hole decreases in the first direction along a direction adjacent to the second through hole, and the diameter of the step hole is greater than or equal to the diameter of the second through hole.

10. A pressure-inducing device, characterized in that: The invention comprises a connecting piece, a positioning tube and a pressure-guiding tube, wherein the connecting piece is used to be arranged on the outer side wall of the inner cylinder in the pressure vessel, the connecting piece is used to be arranged in a ring shape on the outer peripheral side of the second through hole of the inner cylinder, the positioning tube is arranged on the outer side wall of the pressure vessel, the positioning tube is arranged in a ring shape on the outer peripheral side of the first through hole of the pressure vessel, the positioning tube and the pressure-guiding tube both extend in a first direction, the inlet of the pressure-guiding tube passes through the positioning tube and extends into the connecting piece, the inlet of the pressure-guiding tube is communicated with the second through hole so that the gas-liquid two-phase mixture in the inner cylinder can pass through the second through hole into the pressure-guiding tube, a sealing platform is arranged on the outer peripheral side of one end of the positioning tube away from the pressure vessel, a sealing ring and a sealing gasket are sleeved on the outer peripheral side of the pressure-guiding tube, the sealing gasket is located between the sealing platform and the sealing ring, and the sealing ring is threadedly connected to the sealing platform.

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