Reactor thermohydraulic experimental device

Abstract

The invention discloses a reactor thermohydraulic experiment device which is characterized in that two ends of an outer cylinder are respectively communicated with an inlet assembly and an outlet assembly, and a bottom plate and a top plate are sequentially arranged at intervals from the inlet assembly to the outlet assembly and are connected with the outer cylinder, so that an inner cavity of the outer cylinder is cut into a first chamber, a second chamber and a third chamber which are sequentially adjacent; the two ends of the partition plate are connected with the bottom plate and the top plate correspondingly, and the second cavity is cut into a left cavity and a right cavity which are isolated from each other. The flow dividing assembly is arranged in the first cavity and used for providing a uniform inlet flow field. The inlet assembly communicates with the first cavity, the outlet assembly communicates with the third cavity, and the first cavity and the third cavity communicate with the right cavity at the same time. The inner component experiment body is arranged in the right cavity, and the pressure measuring assembly is arranged on the side walls of the first cavity, the right cavity and the third cavity in a penetrating mode. The experimental device reduces an internal flow channel of a reactor metal reflecting layer assembly prototype as much as possible, and the shunting assembly realizes an inlet condition structure of uniform pressure field distribution in front of the bottom plate.

Description

Technical Field

[0001] The invention relates to the technical field of reactor thermal hydraulics experimental research, in particular to an experimental device for reactor thermal hydraulics. Background Art

[0002] During reactor operation, not all of the imported coolant is used to cool the fuel assemblies. A portion of the coolant does not pass through the core fuel assemblies but flows out through the gaps between other structures. The distribution of the share size between the mainstream and the bypass flow directly affects the heat removal of the reactor and even affects the reactivity. Among these shares, the coolant share that passes through the metal reflector structure is called the metal reflector bypass share. In order to control the metal reflector bypass share, obtaining the resistance data of the metal reflector structure through experiments to match the core resistance is an important part of the reactor thermal hydraulic experimental research.

[0003] However, due to the large size and complex structure of the reactor prototype, for the metal reflector bypass flow, people generally choose to focus on its separation effect, that is, to extract the metal reflector structure of concern for thermal hydraulic experiment design. The experimental devices currently used for this experiment are simplified and have very simple structures. Some experimental devices only have a bottom plate and a top plate designed with a cavity structure inside and shortened bypass cavity length, without considering the internal components of the bypass cavity between the two. Some experimental devices do not design core flow channels, and the fluid entering the experimental body only passes through the shroud assembly, which is far from the actual core flow channel.

[0004] In summary, in order to reduce the experimental difficulty and cost, the existing experimental design generally ignores the construction of the inlet flow field conditions or simplifies the metal reflection layer structure, resulting in a large gap between the final experimental data and the actual situation. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an experimental device for reactor thermal hydraulics.

[0006] The technical solution adopted by the present invention to solve its technical problems is: an experimental device for reactor thermal hydraulics, comprising an outer cylinder, an inlet assembly, an outlet assembly, a flow dividing assembly, a bottom plate, a partition, a top plate, an internal component experimental body and a pressure measuring assembly, the two ends of the outer cylinder are respectively connected with the inlet assembly and the outlet assembly, the bottom plate and the top plate are sequentially arranged at intervals from the inlet assembly to the outlet assembly and connected with the outer cylinder, so as to cut the inner cavity of the outer cylinder into a first chamber, a second chamber and a third chamber which are adjacent to each other in sequence; the two ends of the partition are respectively connected with the bottom plate and the top plate, and the second chamber is cut into a left chamber and a right chamber which are isolated from each other; the flow dividing assembly is arranged in the first chamber to provide a uniform inlet flow field;

[0007] The inlet assembly is in communication with the first chamber, the outlet assembly is in communication with the third chamber, the first chamber and the third chamber are in communication with the right chamber at the same time, and the first chamber, the left chamber and the third chamber are isolated in sequence;

[0008] The internal component test body is arranged in the right chamber, and the pressure measuring components are respectively arranged through the side walls of the first chamber, the right chamber and the third chamber.

[0009] In some embodiments, the flow diversion assembly includes a plurality of flow diversion plates disposed at intervals, and each of the flow diversion plates is provided with a plurality of uniform flow diversion holes.

[0010] In some embodiments, the experimental device further comprises a water flow hole experimental block provided with water flow holes, and the water flow hole experimental block is detachably connected to the bottom plate to meet the experimental needs of studying the bypass flow resistance under different water flow holes.

[0011] In some embodiments, the experimental device further comprises a cover plate, which is disposed in the first chamber and opposite to the water flow hole experimental block, and a gap is left between the cover plate and the water flow hole experimental block.

[0012] In some embodiments, the outer cylinder includes a front plate, a side plate, a rear plate and a detachable panel, the side plates are respectively connected to the front plate and the rear plate, the front plate is provided with a window, and the detachable panel is detachably covered on the window.

[0013] In some embodiments, the outer cylinder further comprises a bottom flange;

[0014] The inlet assembly includes an identical inlet flange and a gradually diverging inlet pipe section, and the bottom flange is connected to the inlet flange.

[0015] In some embodiments, the outer cylinder further comprises a top flange;

[0016] The outlet assembly includes an identical outlet flange and a tapered outlet pipe section, and the top flange is connected to the outlet flange.

[0017] In some embodiments, the pressure measuring assembly includes at least four transverse pressure measuring groups and several longitudinal pressure measuring groups, two of the transverse pressure measuring groups are respectively arranged on both sides of the bottom plate, and the spacing between the bottom plates is the same; two of the transverse pressure measuring groups are respectively arranged on both sides of the top plate, and the spacing between the top plates is the same; the longitudinal pressure measuring group is arranged between the bottom plate and the top plate.

[0018] In some embodiments, the front plate and the rear plate are 1 / 8 arc-shaped plates respectively, and the front plate and the rear plate are relatively concave.

[0019] In some embodiments, the experimental device for reactor thermal hydraulics also includes at least two lifting ears and four supports, at least two of the lifting ears are symmetrically connected to the outside of the outer cylinder, and the four supports are symmetrically connected to the outside of the outer cylinder; at least two of the lifting ears and four supports are spaced apart along the axial direction of the outer cylinder.

[0020] By implementing the present invention, the following beneficial effects are achieved:

[0021] The reactor thermal hydraulics experimental device of the present invention comprises an outer cylinder, an inlet assembly, an outlet assembly, a flow dividing assembly, a bottom plate, a partition, a top plate, an internal component experimental body and a pressure measuring assembly, wherein the two ends of the outer cylinder are respectively connected to the inlet assembly and the outlet assembly, the bottom plate and the top plate are sequentially arranged at intervals from the inlet assembly to the outlet assembly and connected to the outer cylinder, so as to cut the inner cavity of the outer cylinder into a first chamber, a second chamber and a third chamber that are sequentially adjacent; the two ends of the partition are respectively connected to the bottom plate and the top plate, and The second chamber is cut into a left chamber and a right chamber which are isolated from each other; the diverter assembly is arranged in the first chamber to provide a uniform inlet flow field; the inlet assembly is connected to the first chamber, the outlet assembly is connected to the third chamber, the first chamber and the third chamber are connected to the right chamber at the same time, and the first chamber, the left chamber and the third chamber are isolated in sequence; the internal component test body is arranged in the right chamber, and the pressure measuring assembly is respectively arranged on the side walls of the first chamber, the right chamber and the third chamber. The experimental device restores the internal flow channel of the prototype of the reactor metal reflector layer assembly as much as possible through the outer cylinder, the inlet assembly, the outlet assembly, the diverter assembly, the bottom plate, the partition, the top plate and the internal component test body, and the diverter assembly realizes the inlet condition structure of uniform pressure field distribution in front of the bottom plate, so that the pressure measuring assembly can test the test data closer to the actual situation of the prototype of the reactor metal reflector layer assembly at each position. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0023] Figure 1 It is a structural schematic diagram of an experimental device for reactor thermal hydraulics according to an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A perspective view of the experimental setup in ;

[0025] Figure 3 yes Figure 1 Front view of the experimental setup in ;

[0026] Figure 4 yes Figure 3AA cross-sectional view of the experimental setup in;

[0027] Figure 5 yes Figure 3 BB section view of the experimental device in;

[0028] Figure 6 yes Figure 3 CC cross-sectional view of the experimental setup in;

[0029] Figure 7 yes Figure 3 DD cross-sectional view of the experimental setup in;

[0030] Figure 8 yes Figure 1 A three-dimensional schematic diagram of part of the experimental device;

[0031] Fig. 9 yes Figure 8 Cross-sectional view of the bottom plate, water hole test block and cover plate. DETAILED DESCRIPTION

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0033] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a chemical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0035] See also Figures 1 to 9 One embodiment of the present invention discloses an experimental device for reactor thermal hydraulics, which is used to study the hydraulic characteristics of a metal reflector layer. The experimental device includes an outer cylinder 1, an inlet assembly 2, an outlet assembly 3, a diverter assembly 4, a bottom plate 5, a baffle 6, a top plate 7, an internal component test body 8, and a pressure measuring assembly. The two ends of the outer cylinder 1 are respectively connected to the inlet assembly 2 and the outlet assembly 3, and the bottom plate 5 and the top plate 7 are sequentially arranged from the inlet assembly 2 to the outlet assembly 3 and connected to the outer cylinder 1 to cut the inner cavity of the outer cylinder 1 into a first chamber 11, a second chamber 12, and a third chamber 13 that are adjacent in sequence. The outer cylinder 1 is used to simulate the shroud of the core, and can take the shroud structure of one eighth of the core. The two ends of the baffle 6 are respectively connected to the bottom plate 5 and the top plate 7, and the second chamber 12 is cut into a left chamber 121 and a right chamber 122 that are isolated from each other. The baffle 6 is used to simulate the shroud flow channel boundary of the core, which is one of the important boundaries of the flow channel that constitutes the bypass flow of the metal reflector layer. The flow divider assembly 4 is arranged in the first chamber 11 to provide a uniform inlet flow field. The flow divider assembly 4 is used to simulate the inlet condition of the uniform pressure field in front of the core lower plate water flow hole 91. Preferably, the flow divider assembly 4 is detachably installed in the first chamber 11 for easy replacement.

[0036] The inlet assembly 2 is connected to the first chamber 11, the outlet assembly 3 is connected to the third chamber 13, the first chamber 11 and the third chamber 13 are connected to the right chamber 122 at the same time, and the first chamber 11, the left chamber 121 and the third chamber 13 are isolated in sequence. The bottom plate 5 between the first chamber 11 and the right chamber 122 is provided with a threaded hole 51, and the top plate 7 between the third chamber 13 and the right chamber 122 is provided with a top partition 72, as shown in FIG. Figure 4 As shown. Figure 5 As shown, the internal component test body 8 is arranged in the right chamber 122, and the pressure measuring components are respectively arranged on the side walls of the first chamber 11, the right chamber 122 and the third chamber 13, that is, the pressure measuring component is partially exposed on the outside of the outer cylinder 1, and the pressure measuring component is respectively connected with the inside of the first chamber 11, the right chamber 122 and the third chamber 13. For example, stepped holes are respectively arranged on the side walls of the first chamber 11, the right chamber 122 and the third chamber 13, and the pressure measuring components are connected with each chamber through the stepped holes on the side walls. Preferably, the internal component test body 8 is a metal reflective layer simulation body, specifically a metal reflective layer simulation body of 1 / 8 the size of the metal reflective layer of the reactor prototype. The internal component test body 8 can be detachably installed in the right chamber 122, so as to facilitate the replacement of different internal component test bodies 8 to complete the hydraulic characteristics verification experiment of different metal reflective layer internal components.

[0037] During the experiment, the fluid is forced to flow out from the circulation pump, transported to the bottom of the experimental device through the pipeline, and enters the experimental device from bottom to top through the inlet component 2. After the fluid is input from the inlet component 2, it enters the first chamber 11. In the first chamber 11, through the redistribution of the diverter component 4, a uniform pressure field distribution inlet condition is constructed in front of the bottom plate 5. The diverted fluid passes through the threaded hole 51 set in the bottom plate 5 (in other embodiments, the diverted fluid passes through the flow hole 91 of the flow hole experimental block 9, see the following text for details), enters the right chamber 122 from the first chamber 11, flows through the internal component experimental body 8 in the right chamber 122, and enters the third chamber 13 through the top partition 72 set on the top plate 7, and finally flows out from the outlet component 3 and returns to the pipeline loop, which can simulate the bypass flow share of the metal reflector layer. At the same time, the pressure measuring components arranged on the side walls of the first chamber 11, the right chamber 122 and the third chamber 13 are used to measure the pressure in real time, and the simulated resistance data of the metal reflector structure can be obtained to match the core resistance.

[0038] In some embodiments, Figure 6 and Figure 8 As shown, the flow diverter assembly 4 includes a plurality of flow diverter plates 41 arranged at intervals, and each flow diverter plate 41 is provided with a plurality of uniform flow diverter holes 42. For example, the number of the flow diverter plates 41 is one, two, three, etc., and the present invention is not limited here. When the number of the flow diverter plates 41 is two or more, the two or more flow diverter plates 41 are parallel to each other and are arranged in an interval and stacked manner. Preferably, in this embodiment, the flow diverter assembly 4 includes two flow diverter plates 41, and after the distribution effect of the plurality of uniform flow diverter holes 42 on the two flow diverter plates 41, the inlet coolant reaches the bottom plate 5. For easy replacement, the flow diverter plate 41 is detachably connected to the outer cylinder 1.

[0039] In some embodiments, Figure 8 and Fig. 9As shown, the experimental device also includes a water flow hole test block 9 provided with a water flow hole 91, and the water flow hole test block 9 is detachably connected to the bottom plate 5 to meet the experimental needs of studying the bypass flow resistance under different water flow holes 91. The water flow hole test block 9 is used to simulate the water flow hole of the lower plate of the core. Among them, the size of the external thread of the water flow hole test block 9 is the same as the size of the reserved threaded hole 51 of the bottom plate 5, and the outer diameters of different water flow hole test blocks 9 are the same, and the apertures of the internal water flow holes 91 are different to correspond to different water flow holes in the lower plate of the core. In order to meet the experimental needs of different new types of metal reflective layer internal components in one experimental device, the water flow hole test block 9 is detachably connected to the bottom plate 5. For example, the threaded hole 51 of the bottom plate 5 is provided with an internal thread, and the water flow hole test block 9 has an external thread. The water flow hole test block 9 is screwed into the threaded hole 51 of the bottom plate 5 to install and fix the water flow hole test block 9. When the water flow hole experimental block 9 needs to be replaced, the current water flow hole experimental block 9 is unscrewed, and the required water flow hole experimental block 9 is replaced according to the above operation to meet the experimental needs of studying the bypass flow resistance under different water flow holes 91. It can be understood that the experimental device with the water flow hole experimental block 9 is set, and the diverted fluid enters the right chamber 122 through the water flow hole 91, and the threaded hole 51 of the bottom plate 5 plays the function of fixing the water flow hole experimental block 9.

[0040] In some embodiments, Figure 7 and Fig. 9 As shown, the experimental device further includes a cover plate 10, which is disposed in the first chamber 11 and is opposite to the water flow hole experimental block 9, and a gap is left between the cover plate 10 and the water flow hole experimental block 9. The cover plate 10 is detachably connected to the bottom plate 5, for example, the cover plate 10 is fixed to the bottom plate 5 by screws to restore the inlet boundary of the water flow hole 91 of the core, and the screws are not shown in the figure.

[0041] Further, the cover plate 10 includes a covering portion 101 and an abutting portion 102, wherein the abutting portion 102 is protruding from the covering portion 101. The abutting portion 102 abuts against the bottom plate 5 and / or the water flow hole test block 9 to form a sealing side. In order to achieve sealing, a sealing gasket 103 is provided between the abutting portion 102 and the bottom plate 5 or the water flow hole test block 9, or a sealing gasket 103, such as a silicone sealing gasket 103, is provided between the covering portion 101 and the bottom plate 5 or the water flow hole test block 9. The covering portion 101 is detachably connected to the bottom plate 5 by screws, and a gap is left between the covering portion 101 and the bottom plate 5 to form an open side, wherein the covering portion 101 and the water flow hole test block 9 are arranged opposite to each other, and the fluid flows into the open side of the cover plate 10 from the cross section of the covering portion 101 and then enters the water flow hole 91 of the water flow hole test block 9, thereby preventing the fluid from flowing directly into the water flow hole 91 of the water flow hole test block 9. Preferably, the cover plate 10 is a semicircular cover plate 10, the covering portion 101 is a semicircular structure, and the connecting portion is a semi-ring structure.

[0042] In some embodiments, Figures 4 to 7As shown, the outer cylinder 1 includes a front plate 14, a side plate 15, a rear plate 16 and a removable panel 17, and the side plate 15 is connected to the front plate 14 and the rear plate 16 respectively, for example, by welding. The front plate 14 is provided with a window, and the removable panel 17 can be removably covered on the window. After removing the removable panel 17 and the inlet flange 21, the internal structure such as the internal component test body 8, the water flow hole test block 9, the diversion assembly 4 and the pressure measurement assembly can be replaced. Among them, the outer cylinder 1 selects one-eighth structure of the core shroud prototype for 1:1 restoration, and the front plate 14 and the rear plate 16 are 1 / 8 arc plates respectively, and the front plate 14 and the rear plate 16 are relatively concave. The front plate 14 is set as an arc plate to completely restore the shape of the shroud, and the rear plate 16 is designed as an arc plate mainly for strength considerations to avoid stress concentration. The side plate 15 includes two pieces of the same size, which are connected to both sides of the front plate 14 and the rear plate 16 respectively. The removable panel 17 extends along the axial direction of the outer cylinder 1, and the axial length is less than or equal to the axial length of the front plate 14, and the radial width is less than the radial width of the front plate 14. For example, the length of the removable panel 17 is the distance from the splitter plate 41 assembly to the top plate 7. It can be understood that in some other embodiments, the reactor metal reflector prototype can be scaled according to the proportional modeling theory at a certain ratio, such as 1:5 to design the experimental device, that is, the outer cylinder 1 selects one-eighth of the core shroud prototype structure for 1:5 restoration.

[0043] Furthermore, if Figure 1 and Figure 2 As shown, in order to strengthen the structural strength of the outer cylinder formed by the front plate 14, the side plate 15, the rear plate 16 and the detachable panel 17, the experimental device further includes a plurality of clamps 40, which are arranged around the outer periphery of the outer cylinder 1, for example, one group, two groups, three groups, etc. When two or more groups of clamps 40 are arranged, the two or more groups of clamps 40 are arranged at intervals along the radial direction of the outer cylinder 1. When the detachable panel 17 needs to be removed, the clamps 40 are removed first.

[0044] In some embodiments, Figures 1 to 3 As shown, the outer cylinder 1 also includes a bottom flange 18. The bottom flange 18 is welded and fixed to the front plate 14, the side plate 15 and the rear plate 16 respectively. Among them, the bottom flange 18 is elliptical. The inlet assembly 2 includes an identical inlet flange 21 and a gradually expanding inlet pipe section 22, and the bottom flange 18 is connected to the inlet flange 21. Preferably, a sealing ring is provided between the bottom flange 18 and the inlet flange 21 to achieve a sealed connection. The inlet pipe section 22 is a conical structure.

[0045] In some embodiments, Figures 1 to 3As shown, the outer cylinder 1 also includes a top flange 19. The top flange 19 is welded and fixed to the front plate 14, the side plate 15 and the rear plate 16 respectively. Among them, the top flange 19 is elliptical. The outlet assembly 3 includes an identical outlet flange 31 and a tapered outlet pipe section 32, and the top flange 19 is connected to the outlet flange 31. Preferably, a sealing ring is provided between the top flange 19 and the outlet flange 31 to achieve a sealed connection. The outlet pipe section 32 is a conical structure.

[0046] The bottom flange 18, the front plate 14, the side plate 15, the rear plate 16 and the top flange 19 are correspondingly connected and fixed in a sealed manner to together form an outer cylinder 1 with an inner cavity.

[0047] In some embodiments, Figure 1 As shown, the installation points of some pressure measuring components are shown. The pressure measuring components include at least four transverse pressure measuring groups and several longitudinal pressure measuring groups. The two transverse pressure measuring groups are respectively arranged on both sides of the bottom plate 5, and the spacing between them is the same as that between the bottom plate 5, and are used to measure the pressure on both sides of the bottom plate 5, and obtain the pressure difference of the bottom plate 5. The two transverse pressure measuring groups are respectively arranged on both sides of the top plate 7, and the spacing between them is the same as that between the top plate 7, and are used to measure the pressure on both sides of the top plate 7, and obtain the pressure difference of the top plate 7. The longitudinal pressure measuring group is arranged between the bottom plate 5 and the top plate 7, specifically arranged inside the right chamber 122, and is used to measure the pressure at the corresponding position in the right chamber 122, and finally obtain the pressure difference at the corresponding position. Among them, as Figure 3 As shown, the longitudinal pressure measuring group includes a plurality of pressure measuring devices 50, and the plurality of pressure measuring devices 50 are arranged at intervals along the axial direction of the right chamber 122. Each transverse pressure measuring group may include two or more pressure measuring devices 50, and the two or more pressure measuring devices 50 are arranged at intervals along the radial direction of the outer cylinder 1. For example, three pressure measuring devices 50 are arranged at 10 cm below the bottom plate 5, and three pressure measuring devices 50 are arranged at corresponding positions at 10 cm above the bottom plate 5, and the line connecting each pressure measuring device 50 on the lower side and one of the pressure measuring devices 50 on the upper side is parallel to the axial direction of the outer cylinder 1. Preferably, the side walls of the first chamber 11, the right chamber 122 and the third chamber 13 are respectively provided with stepped holes, that is, the stepped holes are arranged on one, two or three of the front plate 14, the side plate 15 and the rear plate 16, and the specific arrangement on the front plate 14, the side plate 15 or the rear plate 16 can be arranged according to needs, and each pressure measuring device 50 is sealed and fixedly installed through the stepped hole.

[0048] Understandably, if Figure 2 and Figure 4 As shown, in order to simulate the outlet flow channel of the top plate 7 in the prototype, the experimental device further includes a top baffle 72, which is arranged in the third chamber 13 and is respectively connected and fixed to the top plate 7 and the two side plates 15, and the height of the top baffle 72 along the axial direction of the outer cylinder 1 is less than the height of the third chamber 13 along the axial direction of the outer cylinder 1. The top baffle 72 has the same shape as the baffle 6, and the axes of the top baffle 72 and the baffle 6 along the axial direction of the outer cylinder 1 coincide.

[0049] In some embodiments, Figures 1 to 3 As shown, the experimental device for reactor thermal hydraulics also includes at least two lifting ears 20 and four supports 30, for example, the number of the lifting ears 20 is two, three, four, etc. At least two lifting ears 20 are symmetrically connected to the outside of the outer cylinder 1, and the four supports 30 are symmetrically connected to the outside of the outer cylinder 1. At least two lifting ears 20 and four supports 30 are distributed at intervals along the axial direction of the outer cylinder 1. The supports 30 play a supporting and fixing role when installing the experimental device, and the lifting ears 20 are used to hoist the experimental device.

[0050] The present invention mainly solves the following three problems:

[0051] 1. The present invention solves the problem of designing the special-shaped structure of the 1 / 8 metal reflective layer simulation body, and provides a valuable reference for the design of double-arc special-shaped pressure vessels. The outer cylinder 1 of the experimental device is welded by two 1 / 8 arc plates with different radii and two side plates 15 of the same size, and is surrounded by 4 sets of hoops 40 to strengthen the body strength. Elliptical matching flanges are welded at both ends, and the internal flow channel restores the geometric characteristics of the hanging basket and the surrounding cylinder.

[0052] 2. The present invention solves the problem of experimental verification of different new metal reflective layer internal components. The water hole test block 9, cover plate 10 and internal component test body 8 of the present invention are all detachable structures. The present invention can verify the hydraulic characteristics of two different metal reflective layer structures and meet the full-cycle experimental needs of metal reverse layer structure research and development.

[0053] 3. The present invention solves the problem of constructing the inlet conditions for the uniform pressure field in front of the water flow hole 91 of the lower core plate. In the first chamber 11 in front of the bottom water flow hole experimental block 9, the inlet assembly 2 and the double-layer or multi-layer diverter plate 41 of the diverter assembly 4 are designed. The calculation and experimental results show that a uniform pressure field distribution is formed in front of the water flow hole 91.

[0054] By implementing the present invention, the following beneficial effects are achieved:

[0055] The reactor thermal hydraulics experimental device of the present invention restores the internal flow channel of the reactor metal reflector layer assembly prototype as much as possible through the outer cylinder 1, the inlet assembly 2, the outlet assembly 3, the diverter assembly 4, the bottom plate 5, the partition 6, the top plate 7 and the internal component test body 8, and the diverter assembly 4 realizes the inlet condition structure of the uniform pressure field distribution in front of the bottom plate 5, so that the pressure measuring assembly can test the test data closer to the actual situation of the reactor metal reflector layer assembly prototype at each position.

[0056] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. An experimental device for reactor thermal hydraulics, characterized in that: The invention comprises an outer cylinder (1), an inlet assembly (2), an outlet assembly (3), a flow dividing assembly (4), a bottom plate (5), a partition plate (6), a top plate (7), an internal component test body (8) and a pressure measuring assembly. The two ends of the outer cylinder (1) are respectively connected to the inlet assembly (2) and the outlet assembly (3). The bottom plate (5) and the top plate (7) are arranged in sequence from the inlet assembly (2) to the outlet assembly (3) and are connected to the outer cylinder (1) so as to cut the inner cavity of the outer cylinder (1) into a first chamber (11), a second chamber (12) and a third chamber (13) which are adjacent to each other in sequence. The two ends of the partition plate (6) are respectively connected to the bottom plate (5) and the top plate (7) and cut the second chamber (12) into a left chamber (121) and a right chamber (122) which are isolated from each other. The flow dividing assembly (4) is arranged in the first chamber (11) to provide a uniform inlet flow field. The inlet assembly (2) is in communication with the first chamber (11), the outlet assembly (3) is in communication with the third chamber (13), the first chamber (11) and the third chamber (13) are in communication with the right chamber (122) at the same time, and the first chamber (11), the left chamber (121) and the third chamber (13) are isolated in sequence; The internal component test body (8) is arranged in the right chamber (122), and the pressure measuring components are respectively arranged through the side walls of the first chamber (11), the right chamber (122) and the third chamber (13).

2. The reactor thermal hydraulics experimental device according to claim 1, characterized in that: The flow dividing assembly (4) comprises a plurality of flow dividing plates (41) arranged at intervals, and each of the flow dividing plates (41) is provided with a plurality of uniform flow dividing holes (42).

3. The reactor thermal hydraulics experimental device according to claim 1, characterized in that: The experimental device also includes a water flow hole experimental block (9) provided with a water flow hole (91), and the water flow hole experimental block (9) is detachably connected to the bottom plate (5) to meet the experimental needs of studying the bypass flow resistance under different water flow holes (91).

4. The reactor thermal hydraulics experimental device according to claim 3, characterized in that: The experimental device further comprises a cover plate (10), wherein the cover plate (10) is arranged in the first chamber (11) and is opposite to the water flow hole experimental block (9), and a gap is left between the cover plate (10) and the water flow hole experimental block (9).

5. The reactor thermal hydraulics experimental device according to claim 1, characterized in that: The outer cylinder (1) comprises a front plate (14), a side plate (15), a rear plate (16) and a detachable panel (17); the side plates (15) are respectively connected to the front plate (14) and the rear plate (16); the front plate (14) is provided with a window; and the detachable panel (17) is detachably covered on the window.

6. The reactor thermal hydraulics experimental device according to claim 5, characterized in that: The outer cylinder (1) further comprises a bottom flange (18); The inlet assembly (2) comprises an identical inlet flange (21) and a gradually expanding inlet pipe section (22), and the bottom flange (18) is connected to the inlet flange (21).

7. The reactor thermal hydraulics experimental device according to claim 5, characterized in that: The outer cylinder (1) further comprises a top flange (19); The outlet assembly (3) comprises an identical outlet flange (31) and a tapered outlet pipe section (32), and the top flange (19) is connected to the outlet flange (31).

8. The reactor thermal hydraulics experimental device according to claim 1, characterized in that: The pressure measuring assembly comprises at least four transverse pressure measuring groups and a plurality of longitudinal pressure measuring groups, wherein two of the transverse pressure measuring groups are respectively arranged on both sides of the bottom plate (5) and have the same spacing with the bottom plate (5); two of the transverse pressure measuring groups are respectively arranged on both sides of the top plate (7) and have the same spacing with the top plate (7); and the longitudinal pressure measuring group is arranged between the bottom plate (5) and the top plate (7).

9. The reactor thermal hydraulics experimental device according to any one of claims 5 to 7, characterized in that: The front plate (14) and the rear plate (16) are respectively 1 / 8 arc-shaped plates, and the front plate (14) and the rear plate (16) are relatively concave.

10. The reactor thermal hydraulics experimental device according to any one of claims 1 to 8, characterized in that: The reactor thermal hydraulics experimental device also includes at least two lifting ears (20) and four supports (30), at least two of the lifting ears (20) are symmetrically connected to the outside of the outer cylinder (1), and the four supports (30) are symmetrically connected to the outside of the outer cylinder (1); at least two of the lifting ears (20) and the four supports (30) are distributed at intervals along the axial direction of the outer cylinder (1).

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