Water supply device for in-pipe flow instability experiment

Abstract

The utility model discloses a water supply device for an in-pipe flow instability experiment. The water supply device comprises a first water supply header, a second water supply header, at least four water supply pipes, at least three pressure tapping assemblies and at least two valves, a first storage cavity is formed in the first water supply header, and a second storage cavity is formed in the second water supply header; at least two water supply pipes communicate with the second storage cavity, the other water supply pipes communicate with the first storage cavity, and the free ends, away from the first storage cavity and the second storage cavity, of at least four water supply pipes communicate with the heat exchange pipe assembly. Each pressure taking assembly comprises a pressure measuring piece, at least one pressure measuring piece is arranged on one water supply pipe communicated with the first storage cavity, and at least two water supply pipes communicated with the second storage cavity are each provided with a pressure measuring piece and a valve; according to the utility model, water supply control and outside-pipe heat flow field regulation of a plurality of pipelines, a single pipeline and adjacent pipelines are realized.

Description

Technical Field

[0001] This utility model relates to the field of water supply technology, and in particular to a water supply device for conducting instability experiments on flow in a pipe. Background Technology

[0002] Gas-liquid two-phase flow instability mainly arises in two-phase flow systems where there is coupling between mass flow density, cavitation, and pressure drop. Gas-liquid two-phase flow instability is one of the main technical risks faced during the operation of equipment with in-pipe two-phase flow. Therefore, during the development process, specialized experiments must be conducted to explore the generation mechanism, suppression measures, and stable operating boundaries of two-phase flow instability, and to determine the reasonable in-pipe throttling resistance and power operating range of the equipment.

[0003] In related technologies, flow instability experiments mainly obtain the stable operating curve of the structure by controlling the pressure on the inlet side of the heated unit, the resistance of the inlet throttling device, the medium temperature, the medium flow rate, and the heating power of the heating unit.

[0004] In a multi-pipe boiling heat transfer tube assembly, inter-pipe pulsation and thermal oscillation are important factors affecting flow instability. To realistically simulate the thermal-hydraulic process of the pipe and recreate the temperature and flow fields within the pipe, it is necessary to measure the flow instability phenomena of multiple adjacent pipes.

[0005] When conducting in-situ measurements of flow instability in multi-pipe structures, it is necessary not only to measure the two-phase flow characteristics of a single pipe, but also to consider inter-pipe pulsation, the influence of adjacent pipes on the external heat flow field, and the wall effect, in order to reduce the difference between the flow instability boundary and the original equipment. These factors place high demands on the design and layout of the piping structure of the multi-pipe flow instability experimental device. The piping structure must be able to individually control the feedwater temperature, flow rate, and feedwater pressure of a single pipe and its adjacent pipes; it must also control the internal operating parameters of multiple pipes simultaneously, and monitor the flow instability of some pipes individually. In addition, the piping of the feedwater control device must match the tube bundle layout of the prototype equipment. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a water supply device for an instability test of flow in a pipe.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A water supply device for conducting instability tests on pipe flow includes:

[0009] A first water supply manifold and a second water supply manifold, wherein the first water supply manifold is provided with a first storage cavity and the second water supply manifold is provided with a second storage cavity;

[0010] At least four water supply pipes, at least two of which are connected to the second storage chamber, and the remaining water supply pipes are connected to the first storage chamber. The free ends of the at least four water supply pipes away from the first and second storage chambers are connected to the heat exchange tube assembly.

[0011] At least three pressure tapping components, each including a pressure measuring element, wherein at least one pressure measuring element is configured on one of the water supply pipes communicating with the first storage chamber for flow instability detection; the pressure measuring element is configured on at least two water supply pipes communicating with the second storage chamber for flow instability detection.

[0012] At least two valves are provided on the at least two water supply pipes that are connected to the second storage chamber to control the opening and closing of the water supply pipes and to influence the external heat flow field of the adjacent water supply pipes.

[0013] Furthermore, in the water supply device for the instability test of in-pipe flow, preferably the water supply device for the instability test of in-pipe flow also includes a throttling component, the throttling component includes at least two throttling elements, the at least two throttling elements are connected to the inlet of the at least two water supply pipes connected to the first storage cavity, and are connected to the first storage cavity.

[0014] Furthermore, in the water supply device for the instability test of in-pipe flow, preferably there are more than four water supply pipes, and the multiple water supply pipes are respectively connected to the first storage cavity or the second storage cavity, and the free ends of the multiple water supply pipes away from the first storage cavity and the second storage cavity are connected to the heat exchange tube assembly.

[0015] The pressure measuring element is configured in more than three parts, and is respectively configured on the portion of the water supply pipe communicating with the first storage cavity; it is also respectively configured on each of the water supply pipes communicating with the second storage cavity;

[0016] The valve is configured to be more than two, and the multiple valves are respectively installed on each water supply pipe that communicates with the second storage chamber.

[0017] Furthermore, in the water supply device for the instability test of flow in a pipe, preferably the plurality of pressure measuring elements are respectively arranged on the outermost water supply pipe.

[0018] Furthermore, in the water supply device for the instability test of in-pipe flow, the water supply device for the instability test of in-pipe flow preferably also includes a tube sheet, the tube sheet having a receiving space defined inside, and the water supply pipe passing through the top wall of the tube sheet and extending into the receiving space.

[0019] Furthermore, in the water supply device for the instability test of flow in a pipe, the water supply pipe preferably includes a straight pipe section that is vertically inserted through the top wall of the tube sheet and a straight pipe section that is inclinedly connected to the straight pipe section. The straight pipe section contracts towards the central axis of the receiving space, and the horizontal spacing between the straight pipe sections is smaller than the horizontal spacing between the straight pipe sections.

[0020] Furthermore, in the water supply device for the instability test of flow in a pipe, it is preferable that both the first water supply manifold and the second water supply manifold are equipped with temperature elements and pressure elements.

[0021] Furthermore, in the water supply device for the instability test of flow in a pipe, the first water supply manifold preferably includes a cylindrical first body, a first flange, a flange ring, a base plate, and a first water inlet pipe;

[0022] The first body has openings at both ends, the first flange seal covers the opening at the upper end of the first body, the flange ring surrounds the outer surface below the first body, the first body sits on the base plate and is fixed to the base plate by the flange ring, and the first water inlet pipe is disposed on the first flange.

[0023] The second water supply manifold includes a cylindrical second body, a second flange, and a second water inlet pipe;

[0024] The second body has an opening at the top, the second flange seal covers the opening at the top of the second body, and the second water inlet pipe is disposed on the second flange.

[0025] Furthermore, in the water supply device for the instability test of flow in a pipe, the pressure tapping assembly preferably includes a pressure tapping ring sleeved on the outer surface of the water supply pipe and a mounting hole opened on the pressure tapping ring, and the pressure measuring element is installed in the mounting hole.

[0026] Furthermore, in the water supply device for the instability test of flow in a pipe, the throttling component preferably includes a throttling plate installed in the first storage cavity and a plurality of throttling holes opened on the throttling plate, and the throttling element is installed in the throttling holes.

[0027] The present invention has the following beneficial effects: the water supply control of the water supply device for the instability test of the in-pipe flow, which consists of a first water supply manifold, a second water supply manifold, a water supply pipe, a pressure tapping component, and valves, realizes the water supply control of multiple pipes, a single pipe, and adjacent pipes, as well as the regulation of the external heat flow field. It also highly replicates the fluid flow pattern of the prototype structure, reduces the difference between the flow instability test and the prototype, and monitors the flow instability of the water supply pipe in real time through the pressure tapping component. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0029] Figure 1 This is a cross-sectional structural schematic diagram of a water supply device for an instability test of flow in a pipe, according to some embodiments of this utility model.

[0030] Figure 2 This is a top view of the water supply device for the pipe flow instability test, after removing the first water supply header.

[0031] Figure 3 yes Figure 1 A cross-sectional schematic diagram of the assembly of the first water supply header and the throttling component shown;

[0032] Figure 4 yes Figure 1 A cross-sectional view of the assembly of the water supply pipe and pressure tapping components shown in the figure.

[0033] Figure 5 yes Figure 4 A cross-sectional view of the pressure tapping assembly shown.

[0034] Figure 6 yes Figure 1 The diagram shows a cross-sectional view of the throttling component. Detailed Implementation

[0035] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0036] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0037] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0038] The technical solution adopted by this utility model to solve its technical problem is:

[0039] like Figure 1 and Figure 2As shown, some embodiments of this utility model disclose a water supply device for an instability test of pipe flow. In some embodiments, this water supply device may include: a first water supply manifold 10, a second water supply manifold 20, multiple water supply pipes 30, multiple pressure tapping components 40, multiple valves 50, and a throttling component 60. One end of each of the multiple water supply pipes 30 is connected to the first water supply manifold 10 and the second water supply manifold 20, and the other end of each water supply pipe 30 is connected to a heat exchange tube assembly of the experimental equipment. A pressure tapping component 40 is installed on the portion of the water supply pipe 30 connected to the first water supply manifold 10, and a pressure tapping component 40 is installed on each of the multiple water supply pipes 30 connected to the second water supply manifold 20 for measuring the water supply pressure of the water supply pipes 30. Multiple valves 50 are respectively installed on the multiple water supply pipes 30 connected to the second water supply manifold 20 for controlling the on / off state of each water supply pipe 30 connected to the second water supply manifold 20. The throttling component 60 is disposed in the first water supply manifold 10 and connected to multiple water supply pipes 30 connected to the first water supply manifold 10, so as to control the flow of each water supply pipe 30 connected to the first water supply manifold 10.

[0040] Understandably, the first water header 10 and the second water header 20 store gas and liquid (gas and water), and the gas and liquid flow into the heat exchange tube assembly through multiple water headers 30; multiple pressure tapping components 40 detect the pressure of multiple water headers 30, thereby realizing the measurement of inter-pipe pulsation.

[0041] Specifically, by controlling the flow through multiple feedwater pipes 30 connected to the first feedwater header 10, the feedwater pressure of all feedwater pipes 30 can be detected, allowing for the study of inter-pipe pulsation. By individually controlling the flow through a single feedwater pipe 30 connected to the second feedwater header 20, the external heat flow field of adjacent heat exchanger tubes in the connected heat exchanger tube assembly can be influenced, and the impact of the external heat flow field on the internal flow instability of adjacent heat exchanger tubes can be studied. By simultaneously controlling the flow through all feedwater pipes 30 connected to both the first and second feedwater headers 10, the feedwater pressure of all pipes can be detected, allowing for the study of inter-pipe pulsation in multi-heat exchanger tube thermal systems, the influence of adjacent pipes on the external heat flow field, and wall effects. All of the above water pressure and temperature measurements are for monitoring two-phase flow instability.

[0042] Continue to refer to Figure 1 and Figure 2 In some embodiments, the water supply device for the instability test of the pipe flow also includes a tube sheet 70, through which the lower ends of multiple water supply pipes 30 pass to fix the multiple water supply pipes 70.

[0043] Refer again Figure 1 and Figure 2In some embodiments, the water supply device for the instability test of the pipe flow also includes two temperature elements 80 and two pressure elements 90. The two temperature elements 80 are respectively installed on the first water supply manifold 10 and the second water supply manifold 20. The two pressure elements 90 are respectively installed on the first water supply manifold 10 and the second water supply manifold 20. The temperature elements 80 and the pressure elements 90 can detect the gas-liquid temperature and pressure in the first water supply manifold 10 and the second water supply manifold 20.

[0044] like Figure 1 and Figure 3 As shown, in some embodiments, the first water supply manifold 10 may include a cylindrical first body 11, a first flange 12, a flange ring 13, a base plate 14, and a first water inlet pipe 15. Both ends of the first body 11 are specifically open, defining a first storage cavity 110, which is used to store the gas and liquid used in the experiment. The first flange 12 seals and covers the opening at the upper end of the first body 11. The first water inlet pipe 15 is disposed on the first flange 12. On one hand, the first water inlet pipe 15 is used to introduce gas and liquid; on the other hand, the first water inlet pipe 15 can also be connected to a pressurizing device to pressurize the gas and liquid inside the first storage cavity 110 into the water supply pipe 30, thereby increasing the flow rate of the water supply pipe 30 and realizing the detection of water supply pressure at different flow rates. The flange ring 13 surrounds the outer surface below the first body 11. The first body 11 sits on the base plate 14 and is fixed to the base plate 14 by the flange ring 13. The throttling assembly 60 is installed on the top of the base plate 14 and located inside the first body 11. The first body 11 is removed from the base plate 14, thereby exposing the throttling component 60 and enabling the replacement of the throttling component 60.

[0045] Understandably, pressurizing equipment is used to pressurize the first storage chamber 110 to achieve instability detection (inter-pipe pulsation and external heat flow field) of the water supply pipe 30 connected to the first water supply manifold 10 at different flow rates.

[0046] Pressurize the inside of the first storage cavity 110 using a pressurizing device:

[0047] By switching on and off different water supply pipes 30 connected to the second storage chamber 210, it is possible to investigate the effects of inter-pipe pulsation, external heat flow field and wall effect on the flow instability of the heat exchange tube assembly connected to the water supply pipe 30 connected to the first storage chamber 110.

[0048] Continue to refer to Figure 1In some embodiments, the second water supply manifold 20 may include a cylindrical second body 21, a second flange 22, and a second water inlet pipe 23. The top of the second body 21 has an opening that defines a second storage cavity 210, which stores the gas and liquid used in the experiment. The second flange 22 seals over the opening at the top of the second body 21 and is bolted to the second body 21 for easy disassembly. Alternatively, the second flange 22 may be integrally formed with the second body 21. The second water inlet pipe 23 is disposed on the second flange 22. The second water inlet pipe 23 facilitates connection to the gas and liquid inlet pipes required for the experiment; or, the second water inlet pipe 23 connects to the pressurization equipment required for the experiment to pressurize the interior of the second storage cavity 210, increasing the flow rate from the second storage cavity 210 to the water supply pipe 30 connected to the second water supply manifold 20, thereby enabling the detection of instability in the connection to the second water supply manifold 20 at different flow rates.

[0049] Understandably, the pressurization equipment is existing technology and will not be described in detail again.

[0050] The second storage chamber 210 is pressurized using a pressurizing device:

[0051] Open a single water supply pipe 30 connected to the second water supply manifold 20 to achieve unstable detection of different flow rates in a single water supply pipe 30.

[0052] Two adjacent water supply pipes 30 connected to the second water supply manifold 20 are opened to achieve instability detection at different flow rates of the two adjacent water supply pipes 30 (to investigate the wall effect of the heat exchange tube assembly connected to the two adjacent water supply pipes 30 at different flow rates).

[0053] Open all the water supply pipes 30 connected to the second water supply manifold 20 to achieve instability detection of multiple water supply pipes 30 at different flow rates (to investigate the influence of inter-pipe pulsation and external heat flow field of the heat exchange tube assembly connected to all the water supply pipes 30 of the second water supply manifold 20 at different flow rates).

[0054] like Figure 1 and Figure 4As shown, in some embodiments, the water supply pipe 30 may include a straight pipe section 31 vertically inserted into the top wall of the pipe sheet 70 and a bent pipe section 32 inclinedly connected to the straight pipe section 31. The top ends of the multiple straight pipe sections 31 are respectively inserted into the bottom wall of the bottom plate 14 and the second water supply manifold 20, so that the straight pipe sections 31 can connect to the first storage cavity 110 and the second storage cavity 210. The bottom ends of the straight pipe sections 31 are inserted into the top wall of the pipe sheet 70. The bent pipe sections 32 are received within the receiving space 710 defined inside the pipe sheet 70. The bent pipe sections 32 contract towards the central axis of the receiving space 710 and extend inclinedly towards the central axis of the receiving space 710 to reduce the pipe spacing between the bent pipe sections 32. The horizontal spacing between the bent pipe sections 32 is smaller than the horizontal spacing between the straight pipe sections 31 to increase the pipe spacing between the straight pipe sections 21 above the pipe sheet 70, so that the straight pipe sections 21 of the water supply pipe 20 can be welded to the pipe sheet 70. Of course, in other embodiments, the straight tube section 21 can also be fixed to the tube sheet 70 by means of snap-fit, interference fit, or bonding, and this is not limited here.

[0055] like Figure 1 and Figure 5 As shown, in some embodiments, multiple pressure tapping components 40 are respectively arranged on the outermost water supply pipe 30 to facilitate installation and maintenance.

[0056] Continue to refer to Figure 5 Since multiple pressure tapping components 40 have the same structure, only one pressure tapping component 40 will be described in detail below. In some embodiments, the pressure tapping component 40 may also include a pressure tapping ring 41, a mounting hole 43, and a pressure measuring element 42. The pressure tapping ring 41 is sleeved on the outer surface of the water supply pipe 30, the mounting hole 43 is formed on the pressure tapping ring 41, and the pressure measuring element 41 is installed inside the mounting hole 43. The pressure measuring element 41 can detect the pressure of the medium inside the water supply pipe 30, thereby detecting the instability of the water supply pipe 30.

[0057] For reference Figure 2 In some embodiments, multiple valves 50 are respectively installed on multiple water supply pipes 30 connected to the second water supply manifold 20 to individually control the on / off state of the multiple water supply pipes 30 connected to the second water supply manifold 20.

[0058] like Figure 1 and Figure 6In some embodiments, the throttling assembly 60 may include a throttling plate 62, multiple throttling orifices 63, and multiple throttling elements 61. The throttling plate 62 is installed in the first storage chamber 110 of the first water supply manifold 10 and sits above the base plate 14; multiple throttling orifices 63 are formed on the throttling plate 62, and the multiple throttling orifices 63 are coaxially connected to multiple water supply pipes 30 communicating with the first storage chamber 110. The multiple throttling elements 61 are respectively installed in the multiple throttling orifices 63 to control the flow rate entering the water supply pipes 30 from the first storage chamber 110, thereby realizing the instability detection of the water supply pipes 30 under different flow rates.

[0059] In some embodiments, the throttling element 61 is replaceable, allowing for the replacement of different models of throttling elements 61 to regulate the flow rate from the first storage chamber 110 into the water supply pipe 30. Specifically, the first body 11 is removed from the base plate 14, exposing the replaceable throttling element 61. The throttling element 61 is used to limit the flow rate of the fluid, causing a pressure drop, thereby regulating the flow rate or pressure. The throttling element 61 is prior art, and its specific structure will not be described here.

[0060] It should be noted that, for those skilled in the art, without departing from the concept of this utility model, the above-mentioned technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this utility model.

Claims

1. A water supply device for an experiment of flow instability in a pipe, characterized by, The application relates to a water supply device for an in-pipe flow instability experiment. The water supply device comprises a first water supply header (10) and a second water supply header (20), the first water supply header (10) is internally provided with a first storage cavity (110), and the second water supply header (20) is internally provided with a second storage cavity (210); at least four water supply pipes (30) are arranged, the at least two water supply pipes (30) are communicated with the second storage cavity (210), the remaining water supply pipes (30) are communicated with the first storage cavity (110), and the free ends of the at least four water supply pipes (30) away from the first storage cavity (110) and the second storage cavity (210) are communicated with a heat exchange pipe assembly; at least three pressure taking assemblies (40) are arranged, the pressure taking assemblies (40) each comprise a pressure measuring element (42), the at least one pressure measuring element (42) is arranged on the one water supply pipe (30) communicated with the first storage cavity (110) and is used for detecting flow instability, and the pressure measuring elements (42) are arranged on the at least two water supply pipes (30) communicated with the second storage cavity (210) and are used for detecting flow instability; at least two valves (50) are arranged on the at least two water supply pipes (30) communicated with the second storage cavity (210) and are used for controlling the on-off of the water supply pipes (30) and exerting influence on the pipe outer heat flow field of adjacent water supply pipes (30). The water supply device for the in-pipe flow instability experiment further comprises a throttling assembly (60), the throttling assembly (60) comprises at least two throttling elements (61), the at least two throttling elements (61) are arranged at the inlets (310) of the at least two water supply pipes (30) communicated with the first storage cavity (110) and are communicated with the first storage cavity (110). The water supply pipes (30) are arranged to be more than four, the multiple water supply pipes (30) are respectively communicated with the first storage cavity (110) or the second storage cavity (210), and the free ends of the multiple water supply pipes (30) away from the first storage cavity (110) and the second storage cavity (210) are communicated with the heat exchange pipe assembly. The pressure measuring elements (42) are arranged to be more than three and are respectively arranged on the water supply pipes (30) communicated with the first storage cavity (110); and are respectively arranged on the water supply pipes (30) communicated with the second storage cavity (210).

2. The feedwater device for in-pipe flow instability experiments of claim 1, wherein, The valves (50) are arranged to be more than two and are respectively arranged on the water supply pipes (30) communicated with the second storage cavity (210).

3. The feedwater device for in-pipe flow instability experiments of claim 1, wherein, The multiple pressure measuring elements (42) are respectively arranged on the outermost water supply pipes (30). The water supply device for the in-pipe flow instability experiment further comprises a tube plate (70), the tube plate (70) is internally defined with an accommodation space (710), the water supply pipes (30) pass through the top wall of the tube plate (70) and extend into the accommodation space (710). ​ 4. The feedwater device for a pipe flow instability experiment of claim 3, wherein ​ 5. The feedwater device for in-pipe flow instability experiments of claim 4, wherein, ​ 6. The feedwater device for in-pipe flow instability experiments of claim 5, wherein, The feedwater pipe (30) comprises a straight pipe section (31) vertically penetrating the top wall of the tube plate (70) and a bent pipe section (32) obliquely connected to the straight pipe section (31), the bent pipe section (32) is contracted to the direction of the central axis of the accommodation space (710), and the horizontal distance between the pipes of the bent pipe section (32) is smaller than the horizontal distance between the pipes of the straight pipe section (31).

7. The feedwater device for in-pipe flow instability experiments of claim 2, wherein, The first feedwater header (10) and the second feedwater header (20) are both provided with temperature elements (80) and pressure elements (90).

8. The feedwater device for in-pipe flow instability experiments of claim 2, wherein, The first feedwater header (10) comprises a cylindrical first body (11), a first flange (12), a flange ring (13), a bottom plate (14), and a first water inlet pipe (15); Both ends of the first body (11) have openings, the first flange (12) sealingly covers the opening at the upper end of the first body (11), the flange ring (13) is wrapped around the outer surface below the first body (11), the first body (11) is seated on the bottom plate (14) and is fixed with the bottom plate (14) through the flange ring (13), and the first water inlet pipe (15) is arranged on the first flange (12). The second feedwater header (20) comprises a cylindrical second body (21), a second flange (22), and a second water inlet pipe (23); The top of the second body (21) has an opening, the second flange (22) sealingly covers the opening at the top of the second body (21), and the second water inlet pipe (23) is arranged on the second flange (22).

9. The feedwater device for in-pipe flow instability experiments of claim 3, wherein, The pressure taking assembly (40) further comprises a pressure taking ring (41) sleeved on the outer surface of the feedwater pipe (30) and a mounting hole (43) opened on the pressure taking ring (41), and the pressure measuring element (42) is mounted in the mounting hole (43).

10. The feedwater device for in-pipe flow instability experiments of claim 2, wherein, The throttling assembly (60) further comprises a throttling plate (62) mounted in the first storage cavity (110) and a plurality of throttling holes (63) opened on the throttling plate (62), and the throttling element (61) is mounted in the throttling hole (63).

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