阅读说明：本技术 一种运动条件下棒束通道内流迹可视实验装置及方法 (Visual experimental device and method for flow traces in rod bundle channel under motion condition ) 是由 鲍伟 徐建军 黄彦平 于 2019-10-24 设计创作，主要内容包括：本发明公开了一种运动条件下棒束通道内流迹可视实验装置,包括位于棒束通道外壳内的棒束元件、棒束通道,棒束通道外壳上设置可视窗；棒束通道外壳底部连接固定法兰盘,固定法兰盘用于固定棒束元件并能够使工作介质流入棒束通道内；固定法兰盘上表面设置若干针头,固定法兰盘内设置与所有针头相连通的流道,还包括向流道内注入示踪剂的注入系统。本发明用以解决现有技术中尚无适用于运动条件下棒束通道内流迹可视化实验的装置的问题,实现用于棒束通道内单相流动流迹可视化实验,获取不同运动条件棒束通道内单相流动流迹特性,以便研究运动条件对棒束通道内层流和湍流过程的影响规律,加深对运动条件下棒束通道内流动传热机理的认识的目的。(The invention discloses a visual experimental device for a flow trace in a rod bundle channel under a motion condition, which comprises a rod bundle element and a rod bundle channel, wherein the rod bundle element and the rod bundle channel are positioned in a rod bundle channel shell; the bottom of the rod cluster channel shell is connected with a fixed flange plate, and the fixed flange plate is used for fixing the rod cluster element and enabling a working medium to flow into the rod cluster channel; the upper surface of the fixed flange plate is provided with a plurality of needles, a flow passage communicated with all the needles is arranged in the fixed flange plate, and the injection system is used for injecting a tracer into the flow passage. The invention is used for solving the problem that no device suitable for the visualization experiment of the flow traces in the rod bundle channel under the motion condition exists in the prior art, and realizes the visualization experiment of the single-phase flow traces in the rod bundle channel, and the characteristics of the single-phase flow traces in the rod bundle channel under different motion conditions are obtained, so that the influence law of the motion conditions on the laminar flow and turbulent flow processes in the rod bundle channel is researched, and the purpose of understanding the heat transfer mechanism of the flow in the rod bundle channel under the motion conditions is deepened.)

1. A visual experimental apparatus of flow trace in the rod cluster channel under the motion condition comprises a plurality of rod cluster elements (9) and a rod cluster channel (3) which are positioned in a rod cluster channel shell (1), and is characterized in that a visual window (2) is arranged on the rod cluster channel shell (1); the bottom of the rod bundle channel shell (1) is connected with a fixed flange plate (5), and the fixed flange plate (5) is used for fixing the rod bundle element (9) and enabling a working medium to flow into the rod bundle channel (3); fixed flange dish (5) upper surface sets up a plurality of syringe needles (4), and every syringe needle (4) correspond a cluster of sticks passageway (3), set up runner (6) that are linked together with all syringe needles (4) in fixed flange dish (5), still include to the injection system of tracer is injected in runner (6).

2. The apparatus for visual testing of the flow trace in a rod bundle channel under a moving condition according to claim 1, wherein the injection system comprises a tracer storage tank (7), the tracer storage tank (7) is communicated with the flow channel (6) from the lower surface of the fixed flange plate (5) through a pipeline, and the position of the tracer storage tank (7) is higher than that of the flow channel (6).

3. A visual experimental apparatus of flow traces in rod bundle channels under a motion condition according to claim 2, characterized in that a valve (8) is arranged between the tracer storage tank (7) and the flow channel (6).

4. The visual experimental facility of trails in a rod bundle channel under a motion condition according to claim 1, characterized in that the upper surface of the fixing flange (5) is provided with a plurality of openings, the openings correspond to the rod bundle channels (3) one by one, each opening is positioned in the corresponding rod bundle channel (3), and each opening is provided with a needle (4).

5. A visual experimental apparatus for trails in a bundle channel under a moving condition according to claim 1, characterized in that a plurality of bundle elements (9) are distributed in a square array; a cluster channel (3) formed between one cluster element (9) and a corner of the cluster channel housing (1) is an angular channel (10); the rod cluster channel (3) formed between two adjacent rod cluster elements (9) and the side wall of the rod cluster channel shell (1) is an edge channel (11); the rod cluster channel (3) formed among the four rod cluster elements (9) distributed in a square shape is a central channel (12); the corner channel (10), the side channel (11) and the central channel (12) are all internally provided with needles (4).

6. A visual experimental setup of flow paths in a rod bundle channel under a motion condition according to claim 1, characterized in that a regulating valve and/or a flow meter is arranged between the flow path (6) and each needle (4).

7. A visual experimental method for a flow track in a rod bundle channel under a motion condition is characterized by comprising the following steps:

(a) injecting a tracer into a fixed flange (5) at the bottom of the rod bundle channel shell (1) through an injection system;

(b) the tracer flows to the needles (4) connected in parallel from the flow channel (6) in the fixed flange plate (5) and enters the rod bundle channels (3) through the needles (4); the tracer entering each rod bundle channel (3) is mixed with a working medium and flows upwards together;

(c) tracer flow is observed through the bundle passage housing (1) at the viewing window (2).

8. The method for visual trace experiments in rod bundle channels under sports conditions according to claim 7, characterized in that the tracer injection amount of each needle (4) is independently controlled.

9. A method for visual testing of flow paths in a rod bundle channel under moving conditions according to claim 7, characterized in that the injection system automatically injects the tracer in the tracer storage tank (7) into the flow path (6) in the fixed flange plate (5) through elevation difference.

10. The visual experimental method of the flow traces in the rod bundle channel under the motion condition according to claim 7, characterized in that different motion parameters and/or different thermal parameters are simulated for the rod bundle channel shell (1) in the process of observing the tracer flow traces.

Technical Field

The invention relates to the field of nuclear power, in particular to a visual experimental device and method for a flow path in a rod bundle channel under a motion condition.

Background

The floating nuclear power station and the ship are influenced by wind waves in navigation to enable working medium flow in the system to be under the motion conditions of swinging, lifting and submerging, and the like, at the moment, the single-phase flow system is constantly influenced by additional transient external force fields such as tangential force, centrifugal force, Coriolis force and the like caused by the motion conditions, and the combined action of the additional transient external force fields enables the single-phase flow heat transfer law and the flow characteristics of gas-water two-phase flow in the channel to be changed, so that the safety and the economy of the nuclear power device are influenced. Therefore, the characteristics of the single-phase flow pattern and the transformation research thereof under the motion condition have important engineering application value.

The rod bundle channel is a typical structural form of a reactor core, can be divided into a side channel, an angle channel and a central channel, fluid mixing and migration can occur among different sub-channels, so that the flow heat transfer characteristics in the rod bundle channel are completely different from those of a simple channel, and the premise of accurately obtaining the flow heat transfer characteristics in the rod bundle channel is that the flow trace characteristics and the transformation rules of working media in the rod bundle channel need to be obtained. Therefore, when determining the flow and heat transfer characteristics of a single-phase flow system under the action of a transient external force field, the flow pattern and the transition law of the single-phase flow should be known first, so that an appropriate theoretical formula can be reasonably selected to describe the flow condition. However, due to the limitation of experimental measurement technology under the motion condition, only limited documents report heat transfer and flow characteristics under the motion condition, and no relevant experimental device and experimental method suitable for visualizing the flow path in the rod bundle channel under the motion condition exist.

Disclosure of Invention

The invention aims to provide a device and a method for a visual experiment of a flow track in a rod bundle channel under a motion condition, which solve the problem that the prior art has no device suitable for the visual experiment of the flow track in the rod bundle channel under the motion condition, and realize the purpose of obtaining the characteristics of the single-phase flow track in the rod bundle channel under different motion conditions, so as to research the influence rule of the motion condition on the laminar flow and turbulent flow process in the rod bundle channel and deepen the understanding of the heat transfer mechanism of the flow in the rod bundle channel under the motion condition.

The invention is realized by the following technical scheme:

a visual experimental device for flow traces in a rod bundle channel under a motion condition comprises a plurality of rod bundle elements and a rod bundle channel, wherein the rod bundle elements and the rod bundle channel are positioned in a rod bundle channel shell, and a visual window is arranged on the rod bundle channel shell; the bottom of the rod bundle channel shell is connected with a fixed flange plate, and the fixed flange plate is used for fixing the rod bundle element and enabling a working medium to flow into the rod bundle channel; the fixed flange plate is characterized in that a plurality of needles are arranged on the upper surface of the fixed flange plate, each needle corresponds to one rod bundle channel, a flow channel communicated with all the needles is arranged in the fixed flange plate, and the fixed flange plate further comprises an injection system for injecting a tracer into the flow channel.

Based on the background that a device suitable for a flow trace visualization experiment in a rod bundle channel under a motion condition is not available in the prior art, the invention provides the flow trace visualization experiment device in the rod bundle channel under the motion condition, a rod bundle element is positioned in a rod bundle channel shell, and rod bundle channels are formed among the rod bundle elements and between the rod bundle element and the inner wall of the shell. The fixed flange plate is connected to rod cluster passageway shell bottom, and fixed flange plate is used for fixed rod cluster component and can make in the working medium flows into the rod cluster passageway, even the fixed flange plate in this application can not influence the normal bottom-up flow of working medium in the rod cluster passageway. The fixed flange plate of the device is internally provided with a flow channel which is communicated with all needle heads, each needle head corresponds to one rod bundle channel, namely, each rod bundle channel is internally provided with one needle head, the needle heads are matched with the rod bundle channels one by one, and the needle heads are used for injecting tracer into the rod bundle channels. The source of tracer is an injection system that injects tracer into the flow channels in the mounting flange and then through the flow channels into the bundle channels from the needles. The needles are simultaneously communicated with the flow channel, and can be considered to be connected in parallel between the flow channel and the rod bundle channel, so that the equal and stable injection amount and injection rate of the needles can be ensured on the premise of consistent needle model specifications and the like. The tracer mixes with working medium certainly after getting into the rod bunch passageway, and common upflow, and this device sets up the visual window on rod bunch passageway shell, therefore the researcher can be through observing the tracer flow trace in visual window department, and then judge the fluidic state of rod bunch passageway to satisfy the experiment and observe the demand. The fluid of the rod bundle channel presents different flow trace flow states under the conditions of different motion parameters and different thermal parameters, and workers can provide required motion backgrounds for the rod bundle channel shell to simulate, so that macroscopic visualization flow patterns, transformation characteristics and other experimental data can be synchronously obtained, the influence law of motion conditions is further proved, and the method has important value for disclosing the single-phase flow heat transfer mechanism under the motion conditions.

The injection system comprises a tracer storage tank, wherein the tracer storage tank is communicated with the flow channel from the lower surface of the fixed flange plate through a pipeline, and the position of the tracer storage tank is higher than that of the flow channel. The runner passes through the pipeline and connects tracer storage tank, relies on the difference in height between storage tank and the rod cluster passageway, utilizes gravity automatic will follow the tracer and pour into the rod cluster passageway into, in the experimentation staff only need in time to tracer storage tank in supplementary tracer can, need not to provide power with power such as power consumptions such as pump.

And a valve is arranged between the tracer storage tank and the flow channel. The valve is provided to facilitate the start-up or shut-down of the tracer injection process.

The upper surface of the fixed flange plate is provided with a plurality of openings, the openings correspond to the rod cluster channels one to one, each opening is located in the corresponding rod cluster channel, and a needle head is mounted on each opening.

The rod bundle elements are distributed in a square array; a cluster element is disposed in the cluster channel housing and is configured to form a cluster channel between the cluster element and a corner of the cluster channel housing; the rod cluster channel formed between two adjacent rod cluster elements and the side wall of the rod cluster channel shell is an edge channel; a rod cluster channel formed among the four rod cluster elements in the square distribution is a central channel; and needle heads are arranged in the corner channel, the side channel and the central channel.

Preferably, a regulating valve and/or a flow meter is arranged between the flow passage and each needle. Be convenient for realize the integral control or single control to each syringe needle, and then the accurate tracer injection volume of obtaining and pour into the position into, the experimenter of being convenient for simulates the interior flow trajectory of bundle channel under more complicated, the different operating modes, and then enlarges the application scope of this application.

A visual experimental method for a flow track in a rod bundle channel under a motion condition comprises the following steps:

(a) injecting a tracer into a fixed flange disc at the bottom of the rod bundle channel shell through an injection system;

(b) the tracer flows to each needle head connected in parallel from a flow channel in the fixed flange disc and enters each rod bundle channel through each needle head; the tracer entering each rod bundle channel is mixed with a working medium and flows upwards together;

(c) the tracer flow is observed through a visible window in the bundle channel housing.

According to the method, the tracer is injected into the rod bundle channel sub-channel, the single-phase flow and flow traces in the rod bundle channel under the motion condition can be visually observed, the research is carried out on the single-phase flow and flow trace flow state and flow trace transformation from macroscopic and microscopic angles so as to find the influence rule of the motion condition, and the research connotation of the flow and heat transfer mechanism in the rod bundle channel under the motion condition is enriched.

Preferably, the amount of tracer injected into each needle is independently controlled.

Preferably, the injection system automatically injects the tracer in the tracer tank into the flow channel in the fixed flange by means of a head.

Preferably, during observation of the tracer flow path, different motion parameters and/or different thermal parameters are simulated for the bundle channel housing.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the invention discloses a visual experimental device and a visual experimental method for a flow track in a rod bundle channel under a motion condition, solves the problem that no device suitable for the visual experiment of the flow track in the rod bundle channel under the motion condition exists in the prior art, and realizes the purpose of obtaining the characteristics of the single-phase flow track in the rod bundle channel under different motion conditions by being used for the visual experiment of the single-phase flow track in the rod bundle channel so as to research the influence rule of the motion conditions on the laminar flow and turbulent flow process in the rod bundle channel and deepen the understanding of the heat transfer mechanism of the flow in the rod bundle channel under the motion conditions.

2. According to the rod bundle channel flow trace visual experimental device and the flow trace visual experimental method, experimental data such as macroscopic visual flow patterns and conversion characteristics of the macroscopic visual flow patterns can be synchronously obtained, the influence rule of the motion conditions is further proved, and the rod bundle channel flow trace visual experimental device and the flow trace visual experimental method have important values for revealing a single-phase flow heat transfer mechanism under the motion conditions.

3. The invention automatically injects the tracer into the rod bundle channel through the height difference between the tracer storage box and the rod bundle channel, and the injection needles which are connected in parallel can realize integral control or single control to accurately obtain the injection amount of the tracer, so as to carry out visual research on single-phase flow and flow trace conversion from the front surface and the side surface of the rod bundle channel,

drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic illustration of the distribution of needles on a fixed flange in an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the interior of a rod cluster channel housing in an embodiment of the invention.

Reference numbers and corresponding part names in the drawings:

1-bundle channel housing, 2-viewing window, 3-bundle channel, 4-needle, 5-fixed flange, 6-flow channel, 7-tracer storage tank, 8-valve, 9-bundle element, 10-angle channel, 11-side channel, 12-center channel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.