CN110926562A - Top end positioning piece suitable for flow measurement of rod bundle sub-channel outlet - Google Patents
Top end positioning piece suitable for flow measurement of rod bundle sub-channel outlet Download PDFInfo
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- CN110926562A CN110926562A CN201911296577.0A CN201911296577A CN110926562A CN 110926562 A CN110926562 A CN 110926562A CN 201911296577 A CN201911296577 A CN 201911296577A CN 110926562 A CN110926562 A CN 110926562A
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- rod
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
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Abstract
The invention relates to a top end positioning piece suitable for measuring the outlet flow of a rod bundle sub-channel, which comprises a plurality of positioning pins which are arranged in the same way as a rod bundle, wherein adjacent positioning pins are connected through spacers to form a flow channel in the shape of an inner sub-channel, and the flow channel between each positioning pin and a rod bundle sleeve is also divided through spacers to form a flow channel in the shapes of a side sub-channel and an angle sub-channel. The positioning pin and the spacer are integrally processed to form a top end positioning piece. The center of the top of the rod bundle is provided with a hole for inserting a positioning pin. The inner wall surface of the rod bundle sleeve is provided with a groove for inserting a spacer forming an angle sub-channel flow passage. The top end positioning piece is assembled at the top of the rod cluster, and the top end positioning piece and the rod cluster sleeve are fixedly connected by intermittent welding at the position of the notch at the top of the rod cluster sleeve. The invention can realize the positioning of the top end of the rod cluster on the premise of hardly interfering the flow measurement of the outlet of the rod cluster sub-channel, prevent the rod cluster from freely scattering without restriction, and ensure the accuracy of the geometric dimension of the rod cluster outlet sub-channel so as to improve the flow measurement accuracy of the sub-channel.
Description
Technical Field
The invention belongs to the field of test of flow characteristics of a rod bundle, and particularly relates to a top end positioning piece suitable for measuring flow of an outlet of a rod bundle sub-channel.
Background
The reactor core flow channel is complex, the components are various, the flow channel in the fuel component is compact and long, and the temperature rise and the pressure drop are large. In consideration of the safety design of the reactor, a more accurate and more precise calculation model needs to be adopted in research, the existing design can be verified, parameters can be more conveniently selected and optimized during the conceptual design of the reactor, the research on the core thermal hydraulic problem is promoted, the uncertainty in the thermal hydraulic calculation is reduced, the hot spot factor is effectively reduced, and the safe and stable operation of the reaction is ensured.
Generally, the results of a system program adopting a calculation model at a rod bundle level are conservative, and in order to obtain more accurate distribution of a flow field temperature field in a component, it is very necessary to carry out sub-channel level experiment and theoretical research. Whether the test is carried out on the heat exchange characteristic of the sub-channel or the test is carried out on the pressure drop or the mixing characteristic, the flow of the sub-channel needs to be measured. Because the flow of the sub-channel needs to be measured at the outlet of the rod bundle, in order to not interfere with the flow field, the outlet of the rod bundle is usually not provided with any restriction and is only fixed at the bottom end of the rod bundle, but the deviation between the geometric dimension of the outlet sub-channel and the ideal dimension is large, and the accuracy of the flow measurement of the sub-channel is influenced. Therefore, measures need to be taken, the top end of the rod bundle is fixed under the condition that the outlet flow field is not interfered, and the reasonable effectiveness of the test result is ensured.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the top end positioning piece suitable for measuring the flow of the outlet of the subchannel of the rod bundle, the top end positioning piece is suitable for various types of assemblies, the top end of the rod bundle can be conveniently and effectively fixed in various types of subchannel tests, and the accuracy of test results is improved on the premise of not interfering the flow distribution of the subchannels.
In order to achieve the purpose, the invention adopts the following technical scheme:
a top end positioning piece suitable for measuring flow of an outlet of a rod bundle sub-channel comprises a plurality of positioning pins 1 which are arranged in the same way as a rod bundle 3, adjacent positioning pins 1 are connected through spacers 4 to form a flow channel in the shape of an inner sub-channel, and the flow channel between each positioning pin 1 and a rod bundle sleeve 2 is also divided through the spacers 4 to form a flow channel in the shapes of a side sub-channel and an angle sub-channel; the positioning pin 1 and the spacer 4 are integrally processed to form a top end positioning piece, and the top end positioning piece is assembled at the top of the rod bundle 3 to realize the top end positioning of the rod bundle 3.
The positioning pin 1 consists of two coaxial cylinders, the diameter of the upper cylinder is the same as that of a single rod in the rod bundle 3, the diameter of the lower cylinder is half of that of the upper cylinder, and a chamfer is processed at the bottom section of the lower cylinder; the upper cylinder is 10mm high, and the lower cylinder is 1.5 times of the diameter of the upper cylinder.
The 3 top center trompils of barred bundle are used for inserting locating pin 1, if the number of turns of stick figure stick is less than or equal to 3 in the barred bundle 3 then trompil and locating pin 1 lower cylinder adopt H7/H6 clearance fit, if the number of turns of stick is greater than 3 then adopt H8/H7 clearance fit, the convenient assembly of locating pin 1 of drill way processing chamfer, the trompil degree of depth is than the cylinder length 5mm under the locating pin 1.
The height of the spacer 4 is 10mm same as the height of a cylinder on the positioning pin 1, the spacers between the positioning pin 1 at the outermost ring and the rod bundle sleeve 2 are divided into two types, the first type is the spacer 4 forming an angle sub-channel flow channel, the length of the spacer 4 is longer and extends into the inner wall surface of the rod bundle sleeve 2 by 5mm, the rest are the second type, and the length of the second type spacer 4 is just the gap distance between the positioning pin 1 at the outermost ring and the inner wall surface of the rod bundle sleeve 2.
The corresponding position of the boundary of the angle sub-channel on the inner wall surface of the rod bundle casing 2 is grooved, a groove which is 10mm long and 6mm deep is downwards opened from the top of the rod bundle casing 2 along the inner wall surface, and the groove is used for being inserted into a spacer 4 forming the flow channel of the angle sub-channel to realize the assembly of a top end positioning piece, and the position of the notch on the top of the rod bundle casing 2 is welded intermittently to realize the fixed connection of the top end positioning piece and the rod bundle casing 2, so that the positioning of the rod bundle 3.
The top end positioning piece adopts an integrated processing mode, for example: and the surface roughness of the top positioning piece is consistent with that of the rod bundle 3 during processing in the modes of linear cutting or 3D printing and the like.
Compared with the prior art, the invention has the following advantages:
1. the top end positioning piece is of a sub-channel structure through the matching of the positioning pin and the spacer, the diameter of the upper cylinder of the positioning pin is completely consistent with that of the rod bundle, and meanwhile, the sharp corner design of the bottom end of the spacer is combined, so that the flow distribution of the outlet of the sub-channel is not influenced while the top end of the rod bundle is positioned, the accuracy of the geometric dimension of the outlet of the rod bundle is improved, and more reasonable and reliable sub-channel test data are obtained.
2. The top end positioning piece suitable for measuring the outlet flow of the rod bundle sub-channel has strong applicability, the arrangement mode of the positioning pins is the same as that of the rod bundle, the positioning of the top ends of various types of components can be realized, the whole design is reasonable, simple and practical, the manufacturing cost is extremely low, convenience is provided for the test research of the thermal hydraulic characteristics in the rod bundle sub-channel, and the top end positioning piece can be used for optimizing the design of a test section.
Drawings
FIG. 1 is a schematic view of the overall assembly of a tip positioning element suitable for cluster subchannel outlet flow measurement in accordance with the present invention.
Fig. 2 is a sectional view taken along a-a of fig. 1.
FIG. 3 is a schematic perspective view of a top positioning member for measuring flow at an outlet of a bundle sub-passage according to the present invention.
Detailed Description
The invention is described in detail below with reference to the following figures and detailed description:
as shown in fig. 1, 2 and 3, the present invention is a tip spacer suitable for cluster subchannel outlet flow measurement, comprising a locating pin 1, a cluster sleeve 2, a cluster 3 and a spacer 4.
The arrangement mode of the positioning pins 1 is completely the same as that of the rod bundles 3, adjacent positioning pins 1 are connected through spacers 4 to form a flow channel in the shape of an inner sub-channel, and the flow channel between the positioning pins 1 and the rod bundle sleeves 2 is also divided through the spacers 4 to form a flow channel in the shapes of an edge sub-channel and an angle sub-channel; the positioning pin 1 and the spacer 4 are integrally processed to form a top end positioning piece, and the top end positioning piece is assembled at the top of the rod bundle 3 to realize the top end positioning of the rod bundle 3.
As a preferred embodiment of the present invention, the positioning pin 1 is composed of two coaxial cylinders, the diameter of the upper cylinder is the same as that of a single rod in the rod bundle 3, the diameter of the lower cylinder is half of that of the upper cylinder, and a chamfer is processed at the bottom section of the lower cylinder; the upper cylinder is 10mm high, and the lower cylinder is 1.5 times of the diameter of the upper cylinder.
As a preferred embodiment of the invention, the center of the top of the bar bundle 3 is provided with a hole for inserting the positioning pin 1, if the number of turns of bars in the bar bundle 3 is less than or equal to 3, the hole and the positioning pin 1 are in clearance fit by H7/H6, if the number of turns of bars is more than 3, the hole and the positioning pin 1 are in clearance fit by H8/H7, the hole is chamfered to facilitate the assembly of the positioning pin 1, and the depth of the hole is 5mm longer than that of a cylinder below the positioning pin 1.
As a preferred embodiment of the invention, the height of the spacer 4 is 10mm which is the same as the height of the cylinder on the positioning pin 1, the spacers between the positioning pin 1 of the outermost circle and the rod bundle sleeve 2 are divided into two types, the first type is the spacer 4 forming an angular sub-channel flow passage, the length of the spacer 4 is 5mm deep into the inner wall surface of the rod bundle sleeve 2, the rest is the second type, and the length of the second type spacer 4 is just the clearance distance between the positioning pin 1 of the outermost circle and the inner wall surface of the rod bundle sleeve 2.
In a preferred embodiment of the present invention, the thickness of the spacer 4 is 0.5mm, which minimizes the interference of the spacer 4 to the outlet flow field while ensuring the structural strength of the top end positioning piece, and the thickness of the bottom end of the spacer 4 is gradually reduced to 0 to form a sharp corner, so as to reduce the impact of the fluid on the spacer 4 and avoid the interference to the flow distribution of the sub-channel.
As a preferred embodiment of the present invention, a groove is formed at a position corresponding to the boundary of the angle sub-channel on the inner wall surface of the rod bundle casing 2, a groove with a length of 10mm and a depth of 6mm is formed by downward opening from the top of the rod bundle casing 2 along the inner wall surface, and the groove is used for inserting the spacer 4 forming the flow channel of the angle sub-channel to realize the assembly of the top end positioning piece, and the top end positioning piece is continuously welded at the position of the top groove opening of the rod bundle casing 2 to realize the fixed connection of the top end positioning piece and the rod bundle casing.
As a preferred embodiment of the present invention, the top end retainer is integrally processed, for example: and the surface roughness of the top positioning piece is consistent with that of the rod bundle 3 during processing in the modes of linear cutting or 3D printing and the like.
The foregoing is illustrative of the present invention only and is not to be construed as limiting thereof, and variations and modifications to the above-described embodiments, within the true spirit and scope of the invention, should be considered as within the scope of the claims of the present invention to those skilled in the art.
Claims (6)
1. A top end positioning piece suitable for measuring flow of an outlet of a rod bundle sub-channel is characterized in that: the positioning pin sleeve comprises a plurality of positioning pins (1) which are arranged in the same way as the rod bundles (3), wherein adjacent positioning pins (1) are connected through spacers (4) to form a runner in the shape of an inner sub-channel, and the runner between the positioning pins (1) and the rod bundle sleeve (2) is also divided through the spacers (4) to form runners in the shapes of side sub-channels and corner sub-channels; the positioning pin (1) and the spacer (4) are integrally processed to form a top end positioning piece, and the top end positioning piece is assembled at the top of the rod bundle (3) to realize the top end positioning of the rod bundle (3).
2. The tip locator of claim 1 adapted for use in cluster rod sub-passage outlet flow measurement, wherein: the positioning pin (1) consists of two coaxial cylinders, the diameter of the upper cylinder is the same as that of a single rod in the rod bundle (3), the diameter of the lower cylinder is half of that of the upper cylinder, and a chamfer is processed at the bottom section of the lower cylinder; the upper cylinder is 10mm high, and the lower cylinder is 1.5 times of the diameter of the upper cylinder.
3. The tip locator of claim 2 adapted for use in cluster rod sub-passage outlet flow measurement, wherein: the central trompil in rod cluster (3) top is used for inserting locating pin (1), if the number of turns of stick is less than or equal to 3 in rod cluster (3) then trompil and locating pin (1) lower cylinder adopt H7/H6 clearance fit, if the number of turns of stick is greater than 3 then adopt H8/H7 clearance fit, the convenient locating pin (1) assembly of drill way processing chamfer, the trompil degree of depth is than the cylinder length 5mm under locating pin (1).
4. The tip locator of claim 2 adapted for use in cluster rod sub-passage outlet flow measurement, wherein: the height of the spacer (4) is 10mm which is the same as the height of a cylinder on the positioning pin (1), the spacer between the positioning pin (1) on the outermost ring and the rod bundle sleeve (2) is divided into two types, the first type is the spacer (4) forming an angle sub-channel flow passage, the length of the spacer is longer and extends into the inner wall surface of the rod bundle sleeve (2) by 5mm, the rest is the second type, and the length of the second type spacer (4) is just equal to the clearance distance between the positioning pin (1) on the outermost ring and the inner wall surface of the rod bundle sleeve (2); the corresponding position of the boundary of the angle sub-channel of the inner wall surface of the rod bundle casing pipe (2) is grooved, a groove which is 10mm long and 6mm deep is downwards opened from the top of the rod bundle casing pipe (2) along the inner wall surface for inserting a spacer (4) forming the flow channel of the angle sub-channel, so that the assembly of the top end positioning piece is realized, the position of the groove opening at the top of the rod bundle casing pipe (2) is intermittently welded, so that the top end positioning piece is fixedly connected with the rod bundle casing pipe (2), and the positioning of the rod bundle (3) is.
5. The tip locator of claim 1 adapted for use in cluster rod sub-passage outlet flow measurement, wherein: spacer (4) thickness is 0.5mm, and this size minimize spacer (4) to the interference of export flow field when guaranteeing top setting element structural strength, spacer (4) bottom thickness diminishes gradually to 0 and forms the closed angle for reduce the impact of fluid to spacer (4), in order to avoid causing the interference to subchannel flow distribution.
6. The tip locator of claim 1 adapted for use in cluster rod sub-passage outlet flow measurement, wherein: the top end positioning piece adopts an integrated processing mode, and the surface roughness of the top end positioning piece is ensured to be consistent with that of the rod bundle (3) during processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911296577.0A CN110926562A (en) | 2019-12-16 | 2019-12-16 | Top end positioning piece suitable for flow measurement of rod bundle sub-channel outlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911296577.0A CN110926562A (en) | 2019-12-16 | 2019-12-16 | Top end positioning piece suitable for flow measurement of rod bundle sub-channel outlet |
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| Publication Number | Publication Date |
|---|---|
| CN110926562A true CN110926562A (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911296577.0A Pending CN110926562A (en) | 2019-12-16 | 2019-12-16 | Top end positioning piece suitable for flow measurement of rod bundle sub-channel outlet |
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| CN (1) | CN110926562A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113280867A (en) * | 2021-06-17 | 2021-08-20 | 上海交通大学 | Silk screen sensor assembly for measuring fluid parameters in prototype rod bundle channel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113280867A (en) * | 2021-06-17 | 2021-08-20 | 上海交通大学 | Silk screen sensor assembly for measuring fluid parameters in prototype rod bundle channel |
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