CN115620928A - Spiral cross-shaped single rod and rod bundle channel flow heat transfer experimental device and experimental method - Google Patents
Spiral cross-shaped single rod and rod bundle channel flow heat transfer experimental device and experimental method Download PDFInfo
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- CN115620928A CN115620928A CN202211192171.XA CN202211192171A CN115620928A CN 115620928 A CN115620928 A CN 115620928A CN 202211192171 A CN202211192171 A CN 202211192171A CN 115620928 A CN115620928 A CN 115620928A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/322—Means to influence the coolant flow through or around the bundles
- G21C3/3225—Means to influence the coolant flow through or around the bundles by waterrods
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/017—Inspection or maintenance of pipe-lines or tubes in nuclear installations
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/02—Devices or arrangements for monitoring coolant or moderator
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/326—Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
- G21C3/328—Relative disposition of the elements in the bundle lattice
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/334—Assembling, maintenance or repair of the bundles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention discloses a spiral cross-shaped single rod and rod bundle channel flow heat transfer experimental device and an experimental method, and relates to the technical field of experimental devices. The experimental device adopts a direct-current power supply for heating, and experiments with different heating powers are carried out by controlling the current of the direct-current power supply. Wall temperature and fluid temperature measuring points are arranged on the temperature measuring section, a thermocouple is welded on the outer wall surface of the spiral cross-shaped element by adopting brazing, and in order to eliminate interference to a flow field, a thermocouple signal lead is led out from a hollow tube of the spiral cross-shaped element. Two groups of pressure guiding pipes are vertically welded on the shell barrel, and two groups of pressure difference measuring results can be mutually corrected. The invention can accurately obtain the flow heat transfer characteristic experimental data of the spiral cross single rod and rod bundle channel, thereby providing data support for the design and safety analysis of the nuclear reactor core.
Description
Technical Field
The invention relates to the technical field of experimental devices, in particular to a spiral cross-shaped single-rod and rod bundle channel flow heat transfer experimental device and an experimental method.
Background
The spiral cross fuel assembly is a new type of fuel assembly for nuclear reactors, which has a spiral structure that enhances heat transfer between the coolant and the fuel elements. The spiral cross fuel elements can be mutually supported and positioned, so that a positioning grid is eliminated. The spiral cross fuel assembly can increase power density and core fuel loading compared to conventional reactor nuclear fuel. Studying the flow heat transfer characteristics of the coolant in the spiral cross fuel assembly can support core design and safety analysis.
The surface of the spiral cross-shaped fuel element is of a spiral structure, so that the problems of heating of an experimental section, measurement of wall temperature and fluid temperature and the like are faced when a flow heat transfer experiment is carried out, the existing spiral cross-shaped fuel assembly related experiments are all flow resistance characteristic experiments, and no report is found in the heat transfer experiment related to the spiral cross-shaped fuel assembly.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a flow heat transfer experimental device for a spiral cross type single rod and rod bundle channel, which utilizes the experimental result of the spiral cross type single rod and rod bundle channel to obtain the flow heat transfer characteristic of a spiral cross type fuel assembly. The experimental device can be used for developing the flow heat transfer characteristic experiment of the spiral cross-shaped single rod and rod bundle channel, can accurately obtain the correlation and experimental data of the resistance and heat transfer experiment, and provides data support for the design and safety analysis of the reactor core.
In order to achieve the purpose, the invention adopts the following technical scheme:
a spiral cross-shaped single rod and rod bundle channel flow heat transfer experimental device comprises an upper sealing assembly 1-1, an upper end cover flange 1-2, an upper conductive copper bar 1-3, an upper conductive head 1-4, a conductive sleeve 1-5, a positioning block 1-6, a shell cylinder 1-7, an insulating part 1-8, a spiral cross-shaped element 1-9, a positioning cylinder 1-10, a lower conductive head 1-11, a lower conductive copper bar 1-12, a lower sealing cover 1-13, a lower end cover flange 1-14, an insulating sealing part 1-15, a copper braid 1-16, a pressure guiding pipe 1-17, a lower chamber 1-18, a positioning grid 1-19, a fastening bolt and nut 1-20, an upper chamber 1-21, a first differential pressure transmitter 1-22 and a second differential pressure transmitter 1-23; the spiral cross-shaped element 1-9 is positioned in the experimental device, the upper part of the spiral cross-shaped element 1-9 is in interference connection with the upper sealing component 1-1, and the upper sealing component 1-1 is in interference connection with the upper conductive head 1-4 through the conductive sleeve 1-5; the upper sealing component 1-1, the upper end cover flange 1-2 and the upper conductive copper bar 1-3 are connected by fastening bolts and nuts 1-20 and insulating sealing elements 1-15; the lower part of the upper conductive head 1-4 is provided with a positioning block 1-6, and the positioning block 1-6 is in contact with the circumferential surface of the upper sealing component 1-1 to limit the transverse displacement of the upper sealing component 1-1; the lower chamber 1-18 is provided with an inlet connecting pipe, the upper chamber 1-21 is provided with an outlet connecting pipe, and the shell cylinder 1-7, the lower chamber 1-18 and the upper chamber 1-21 are connected by welding; the shell barrel 1-7 is connected with the insulating part 1-8 in an interference mode, the spiral cross-shaped element 1-9 is arranged in the insulating part 1-8, and the positioning grillwork 1-19 is located between the insulating part 1-8 and the spiral cross-shaped element 1-10 and plays a role in fixing the spiral cross-shaped element 1-10; the lower parts of the spiral cross-shaped elements 1-9 are fixed by positioning cylinders 1-10, and the spiral cross-shaped elements 1-9 are connected with lower conductive heads 1-11 through copper braids 1-16; the lower conductive copper bar 1-12 is arranged between the lower conductive head 1-11 and the lower sealing cover 1-13, and the lower conductive copper bar 1-12, the lower sealing cover 1-13 and the lower end cover flange 1-14 are connected by fastening bolts and nuts 1-20 and an insulating sealing element 1-15;
when the spiral cross-shaped elements 1-9 are single rods, the temperature measuring sections of the experimental device comprisebase:Sub>A first temperature measuring section A-A of the single rod andbase:Sub>A second temperature measuring section B-B of the single rod;
when the spiral cross-shaped elements 1-9 are bundles, the thermometric sections of the experimental apparatus include a first thermometric section C-C of the bundle and a second thermometric section D-D of the bundle.
The insulating members 1-8 are insulating flow channel tubes in the experimental setup when the spiral cross members 1-9 are single rods, and insulating flow channel plates in the experimental setup when the spiral cross members 1-9 are bundles of rods; the insulating runner pipe and the insulating runner plate are made of polyether-ether-ketone.
When the spiral cross-shaped elements 1-9 are single rods, the experimental device is a single element; when the spiral cross-shaped elements 1-9 are rod bundles, a plurality of elements are arranged in the experimental device; the positioning blocks 1-6 are single when the screw cross members 1-9 are single rods, and the number of positioning blocks 1-6 is the same as the number of screw cross members 1-9 in a bundle when the screw cross members 1-9 are bundles.
The shell barrels 1-7 comprise an upper barrel, a middle barrel and a lower barrel, and the upper barrel and the middle barrel and the lower barrel are connected through fastening bolts, nuts and insulating sealing pieces.
The pressure-leading pipes 1-17 comprise first pressure-leading pipes 1-17-1, second pressure-leading pipes 1-17-2, third pressure-leading pipes 1-17-3 and fourth pressure-leading pipes 1-17-4, the first pressure-leading pipes 1-17-1 and the third pressure-leading pipes 1-17-3 are pressure differences of a group of measurement experimental devices, the second pressure-leading pipes 1-17-2 and the fourth pressure-leading pipes 1-17-4 are pressure differences of a group of experimental devices, and the two groups of pressure differences can be mutually corrected; the shell comprises a shell barrel 1-7, and is characterized in that pressure guiding pipes 1-17 are vertically welded on the shell barrel 1-7, a first pressure guiding pipe 1-17-1 is arranged at the lower part position close to an upper cavity 1-21, a second pressure guiding pipe 1-17-2 is arranged at the lower part position close to the first pressure guiding pipe 1-17-1, a third pressure guiding pipe 1-17-3 and a fourth pressure guiding pipe 1-17-4 are arranged below the first pressure guiding pipe 1-17-1 and the second pressure guiding pipe 1-17-2, and the vertical distance between the first pressure guiding pipe 1-17-1 and the third pressure guiding pipe 1-17-3 is equal to the vertical distance between the second pressure guiding pipe 1-17-2 and the fourth pressure guiding pipe 1-17-4.
The measuring points of the single-rod first temperature measuring section A-A comprisebase:Sub>A single-rod wall temperature first measuring point A-1,base:Sub>A single-rod wall temperature second measuring point A-2,base:Sub>A fluid temperature first measuring point A-3 andbase:Sub>A fluid temperature second measuring point A-4, the single-rod wall temperature first measuring point A-1 is located at the middle point ofbase:Sub>A leaf of the spiral cross-shaped element 1-9, the single-rod wall temperature second measuring point A-2 is located at the middle point ofbase:Sub>A leaf valley of the spiral cross-shaped element 1-9, and the fluid temperature first measuring point A-3 and the fluid temperature second measuring point A-4 are located inbase:Sub>A fluid area near the leaf valley of the spiral cross-shaped element 1-9; the measuring points of the single-rod second temperature measuring section B-B and the single-rod first temperature measuring section A-A are arranged the same;
the measuring points of the first temperature measuring section C-C of the rod bundle comprise a plurality of groups of wall temperature measuring points and a plurality of groups of fluid temperature measuring points, and the wall temperature measuring points are positioned at the middle points of the valleys and the lobes of the spiral cross-shaped elements 1-9; the fluid temperature measurement points are located in the fluid region near the spiral cross elements 1-9; the measuring points of the first temperature measuring section C-C of the rod cluster and the second temperature measuring section D-D of the rod cluster are arranged identically.
In the case of seven elements of the spiral cross-shaped elements 1-9, the first temperature measuring section C-C measuring point of the rod bundle channel flow heat transfer experimental device comprises a rod bundle fluid temperature first measuring point C-1, a rod bundle fluid temperature second measuring point C-2, a rod bundle fluid temperature third measuring point C-3, a rod bundle fluid temperature fourth measuring point C-4, a first element rod wall temperature first measuring point C-5, a first element rod fluid temperature first measuring point C-6, a second element rod wall temperature first measuring point C-7, a second element rod wall temperature second measuring point C-8, a third element rod fluid temperature first measuring point C-17, a third element rod fluid temperature second measuring point C-18 a fourth element rod wall temperature first measuring point C-19, a fourth element rod wall temperature second measuring point C-20, a fourth element rod wall temperature third measuring point C-21, a fifth element rod wall temperature first measuring point C-9, a fifth element rod wall temperature second measuring point C-11, a fifth element rod fluid temperature first measuring point C-10, a sixth element rod wall temperature first measuring point C-15, a sixth element rod wall temperature second measuring point C-16, a seventh element rod wall temperature first measuring point C-12, a seventh element rod wall temperature second measuring point C-13 and a seventh element rod fluid temperature third measuring point C-14; a first measuring point C-5 of the wall temperature of the first element rod, a first measuring point C-7 of the wall temperature of the second element rod, a second measuring point C-8 of the wall temperature of the second element rod, a second measuring point C-11 of the wall temperature of the fifth element rod, a third measuring point C-14 of the fluid temperature of the seventh element rod, a first measuring point C-15 of the wall temperature of the sixth element rod, a first measuring point C-19 of the wall temperature of the fourth element rod and a third measuring point C-21 of the wall temperature of the fourth element rod are positioned at the middle points of the vanes of the spiral cross-shaped elements 1-9; a fifth element rod wall temperature first measuring point C-9, a seventh element rod wall temperature first measuring point C-12, a seventh element rod wall temperature second measuring point C-13, a sixth element rod wall temperature second measuring point C-16 and a fourth element rod wall temperature second measuring point C-20 are positioned at the middle point of a leaf valley of the spiral cross-shaped element; a first measuring point C-1 of the temperature of the rod cluster fluid, a second measuring point C-2 of the temperature of the rod cluster fluid, a third measuring point C-3 of the temperature of the rod cluster fluid, a fourth measuring point C-4 of the temperature of the rod cluster fluid, a first measuring point C-6 of the temperature of the first element rod fluid, a first measuring point C-10 of the temperature of the fifth element rod fluid, a first measuring point C-17 of the temperature of the third element rod fluid and a second measuring point C-18 of the temperature of the third element rod fluid are located in a fluid area near seven spiral cross-shaped elements 1-9; and the measuring points of the second temperature measuring section D-D of the rod cluster and the first temperature measuring section C-C of the rod cluster are arranged identically.
In the single-rod first temperature measuring section A-A, the single-rod second temperature measuring section B-B, the rod cluster first temperature measuring section C-C and the rod cluster second temperature measuring section D-D,base:Sub>A wall temperature measuring point andbase:Sub>A fluid temperature measuring point adopt K-type thermocouples, and the thermocouples of the wall temperature measuring point are welded on the outer wall surfaces of the spiral cross-shaped elements 1-9 by brazing; thermocouple signal leads of a first element rod fluid temperature first measuring point C-6, a fifth element rod fluid temperature first measuring point C-10, a third element rod fluid temperature first measuring point C-17, a third element rod fluid temperature second measuring point C-18 and a wall temperature measuring point are led out of the upper sealing assembly 1-1 through an inner hollow tube of the spiral cross-shaped element.
The experimental method of the spiral cross-shaped single rod and rod bundle channel flow heat transfer experimental device is realized by the following steps:
the method comprises the following steps: testing the working performance of the K-type thermocouple on the first temperature measuring section A-A of the single rod, the second temperature measuring section B-B of the single rod, the first temperature measuring section C-C of the rod cluster and the second temperature measuring section D-D of the rod cluster;
step two: connecting an inlet connecting pipe of a lower chamber 1-18 and an outlet connecting pipe of an upper chamber 1-21 of the experimental device with a connecting pipe of an experimental loop; two interfaces of a first differential pressure transmitter 1-22 are respectively connected with a first pressure leading pipe 1-17-1 and a third pressure leading pipe 1-17-3; two interfaces of a second differential pressure transmitter 1-23 are respectively connected with a second pressure leading pipe 1-17-2 and a fourth pressure leading pipe 1-17-4;
step three: setting the spiral cross-shaped elements 1-9 as single rods, then setting the experimental device as a spiral cross-shaped single-rod channel flow heat transfer experimental device, developing a flow resistance experiment of the spiral cross-shaped single-rod channel flow heat transfer experimental device, adjusting the flow of an experimental loop and the temperature of fluid of an inlet connecting pipe of the spiral cross-shaped single-rod channel flow heat transfer experimental device, and simultaneously recording the readings of the first differential pressure transmitter 1-22 and the second differential pressure transmitter 1-23; completing different experimental working conditions;
step four: setting the spiral cross-shaped elements 1-9 as single rods, then setting the experimental device as a spiral cross-shaped single-rod channel flow heat transfer experimental device, developing a heat transfer experiment of the spiral cross-shaped single-rod channel flow heat transfer experimental device, adjusting the current of a low-voltage direct-current power supply connected with the upper conductive copper bars 1-3 and the lower conductive copper bars 1-12 of the single-rod channel flow heat transfer experimental device, and heating by using the resistance of the spiral cross-shaped elements 1-9; adjusting the flow of the experiment loop; fixing the fluid temperature of an inlet connecting pipe and the fluid temperature of an outlet connecting pipe of the spiral cross-shaped single-rod channel flow heat transfer experimental device; simultaneously recording temperature measurement values of the first single-rod temperature measurement section A-A and the second single-rod temperature measurement section B-B; completing different experimental working conditions;
step five: arranging the spiral cross-shaped elements 1-9 as rod bundles, wherein the experimental device is a spiral cross-shaped rod bundle channel flow heat transfer experimental device, and connecting inlet connecting pipes of a lower chamber 1-18 and outlet connecting pipes of an upper chamber 1-21 of the spiral cross-shaped rod bundle channel flow heat transfer experimental device with connecting pipes of an experimental loop; two interfaces of a first differential pressure transmitter 1-22 are respectively connected with a first pressure guiding pipe 1-17-1 and a third pressure guiding pipe 1-17-3; two interfaces of a second differential pressure transmitter 1-23 are respectively connected with a second pressure leading pipe 1-17-2 and a fourth pressure leading pipe 1-17-4; step six: setting the spiral cross-shaped elements 1-9 as the rod bundles, then setting the experimental device as a spiral cross-shaped rod bundle channel flow heat transfer experimental device, developing a flow resistance experiment of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, adjusting the flow of an experimental loop and the temperature of fluid of an inlet connecting pipe of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, and simultaneously recording the readings of the first differential pressure transmitter 1-22 and the second differential pressure transmitter 1-23; completing different experimental working conditions;
step seven: setting the spiral cross-shaped elements 1-9 as the rod bundles, then setting the experimental device as a spiral cross-shaped rod bundle channel flow heat transfer experimental device, developing a heat transfer experiment of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, adjusting the current of a low-voltage direct-current power supply connected with the upper conductive copper bars 1-3 and the lower conductive copper bars 1-12 of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, and heating by using the resistors of the spiral cross-shaped elements 1-9; adjusting the flow of the experiment loop; the fluid temperature of an inlet connecting pipe and the fluid temperature of an outlet connecting pipe of the fixed spiral cross-shaped rod bundle channel flow heat transfer experimental device are measured; simultaneously recording temperature measurement values of the first temperature measurement section C-C and the second temperature measurement section D-D of the rod cluster; different experimental conditions are completed.
Compared with the prior art, the invention has the following advantages:
1. the experimental device adopts the insulating runner pipe and the insulating runner plate as insulating parts, and has good safety and reliability.
2. The pressure measuring point and the temperature measuring point consider redundancy and have good reliability.
3. The invention adopts low voltage and high current to carry out resistance heating on the spiral cross element, and the heating power of the spiral cross element is changed by adjusting direct current.
4. The wall temperature measuring method can eliminate the interference of thermocouple signal leads to the flow field, and the fluid temperature measuring method can reduce the interference of the thermocouple signal leads to the flow field as much as possible.
Drawings
FIG. 1 is a schematic structural diagram of a single rod channel flow heat transfer experimental apparatus of the present invention.
FIG. 2 is a schematic structural diagram of a cluster channel flow heat transfer experimental apparatus of the present invention. FIG. 3 isbase:Sub>A distribution diagram of the point A-A of the first temperature measurement section of the single rod of the experimental apparatus for single rod channel flow heat transfer of the present invention.
FIG. 4 is a distribution diagram of the first temperature measurement section C-C measurement point of the rod bundle of the experimental apparatus for flow heat transfer of rod bundle channel of the present invention.
Detailed Description
The invention provides a spiral cross-shaped single rod and rod bundle channel flow heat transfer experimental device, which is further described in detail by combining the attached drawings.
As shown in fig. 1 and fig. 2, a spiral cross-shaped single rod and rod bundle channel flow heat transfer experimental device comprises an upper sealing assembly 1-1, an upper end cover flange 1-2, an upper conductive copper bar 1-3, an upper conductive head 1-4, a conductive sleeve 1-5, a positioning block 1-6, a shell barrel 1-7, an insulating part 1-8, a spiral cross-shaped element 1-9, a positioning cylinder 1-10, a lower conductive head 1-11, a lower conductive copper bar 1-12, a lower sealing cover 1-13, a lower end cover flange 1-14, an insulating sealing part 1-15, a copper braid 1-16, a pressure leading pipe 1-17, a lower cavity 1-18, a positioning bolt-19, a fastening bolt-nut grid 1-20, an upper cavity 1-21, a first differential pressure transmitter 1-22 and a second differential pressure transmitter 1-23; the spiral cross-shaped element 1-9 is positioned in the experimental device, the upper part of the spiral cross-shaped element 1-9 is in interference connection with the upper sealing component 1-1, and the upper sealing component 1-1 is in interference connection with the upper conductive head 1-4 through the conductive sleeve 1-5; the upper sealing component 1-1, the upper end cover flange 1-2 and the upper conductive copper bar 1-3 are connected by fastening bolts and nuts 1-20 and insulating sealing elements 1-15; the lower part of the upper conductive head 1-4 is provided with a positioning block 1-6, and the positioning block 1-6 is in contact with the circumferential surface of the upper sealing component 1-1 to limit the transverse displacement of the upper sealing component 1-1; the lower chamber 1-18 is provided with an inlet connecting pipe, the upper chamber 1-21 is provided with an outlet connecting pipe, and the shell cylinder 1-7, the lower chamber 1-18 and the upper chamber 1-21 are connected by welding; the shell cylinder 1-7 is connected with the insulating part 1-8 in an interference mode, a spiral cross-shaped element 1-9 is arranged in the insulating part 1-8, and a positioning grid 1-19 is located between the insulating part 1-8 and the spiral cross-shaped element 1-10 and plays a role in fixing the spiral cross-shaped element 1-10; the lower parts of the spiral cross-shaped elements 1-9 are fixed by positioning cylinders 1-10, and the spiral cross-shaped elements 1-9 are connected with lower conductive heads 1-11 through copper braids 1-16; the lower conductive copper bar 1-12 is arranged between the lower conductive head 1-11 and the lower sealing cover 1-13, and the lower conductive copper bar 1-12, the lower sealing cover 1-13 and the lower end cover flange 1-14 are connected by fastening bolts and nuts 1-20 and an insulating sealing element 1-15;
when the spiral cross-shaped elements 1-9 are single rods, the temperature measuring sections of the experimental device comprisebase:Sub>A first temperature measuring section A-A of the single rod andbase:Sub>A second temperature measuring section B-B of the single rod;
when the spiral cross-shaped elements 1-9 are bundles, the temperature measuring cross-sections of the experimental device include a first temperature measuring cross-section C-C of the bundle and a second temperature measuring cross-section D-D of the bundle.
As a preferred embodiment of the invention, the insulating members 1-8 are insulating flow channel tubes in the experimental setup when the spiral cross members 1-9 are single rods, and insulating flow channel plates in the experimental setup when the spiral cross members 1-9 are bundles of rods; the insulating runner pipe and the insulating runner plate are made of polyether-ether-ketone.
As a preferred embodiment of the invention, the helical cross elements 1-9 are machined from stainless steel hollow tube.
As a preferred embodiment of the present invention, the length of the spiral cross-shaped element of the single rod and bundle channel flow heat transfer experimental apparatus is preferably 1.5-2m.
As a preferred embodiment of the invention, the spiral cross elements 1-9 are single rods, single elements in the experimental setup; when the spiral cross-shaped elements 1-9 are rod bundles, a plurality of elements are arranged in the experimental device; when the screw cross members 1-9 are single rods, the positioning blocks 1-6 are single, and when the screw cross members 1-9 are bundles, the number of positioning blocks 1-6 is the same as the number of screw cross members 1-9 in the bundles.
As a preferred embodiment of the invention, the shell barrel 1-7 comprises an upper barrel, a middle barrel and a lower barrel, and the upper barrel and the middle barrel and the lower barrel are connected by adopting a fastening bolt, a fastening nut and an insulating sealing piece.
As a preferred embodiment of the present invention, the pressure introduction pipes 1 to 17 comprise a first pressure introduction pipe 1 to 17-1, a second pressure introduction pipe 1 to 17-2, a third pressure introduction pipe 1 to 17-3 and a fourth pressure introduction pipe 1 to 17-4; the first pressure guiding pipe 1-17-1 and the third pressure guiding pipe 1-17-3 are used for measuring the pressure difference of a group of experimental devices, the second pressure guiding pipe 1-17-2 and the fourth pressure guiding pipe 1-17-4 are used for measuring the pressure difference of a group of experimental devices, and the two groups of pressure differences can be mutually corrected; the pressure guide pipes 1-17 are vertically welded on the shell barrel 1-7, the first pressure guide pipe 1-17-1 is arranged at the lower part position close to the upper cavity 1-21, the second pressure guide pipe 1-17-2 is arranged at the lower part position close to the first pressure guide pipe 1-17-1, the third pressure guide pipe 1-17-3 and the fourth pressure guide pipe 1-17-4 are arranged below the first pressure guide pipe 1-17-1 and the second pressure guide pipe 1-17-2, and the vertical distance between the first pressure guide pipe 1-17-1 and the third pressure guide pipe 1-17-3 is equal to the vertical distance between the second pressure guide pipe 1-17-2 and the fourth pressure guide pipe 1-17-4.
As shown in FIG. 3, asbase:Sub>A preferred embodiment of the invention, the measuring points of the single-rod first temperature measuring section A-A comprisebase:Sub>A single-rod wall temperature first measuring point A-1,base:Sub>A single-rod wall temperature second measuring point A-2,base:Sub>A fluid temperature first measuring point A-3 andbase:Sub>A fluid temperature second measuring point A-4, the single-rod wall temperature first measuring point A-1 is located at the middle point of the lobe of the spiral cross-shaped element 1-9, the single-rod wall temperature second measuring point A-2 is located at the middle point of the valley of the spiral cross-shaped element 1-9, and the fluid temperature first measuring point A-3 and the fluid temperature second measuring point A-4 are located in the fluid area near the valley of the spiral cross-shaped element 1-9; the measuring points of the single-rod second temperature measuring section B-B and the single-rod first temperature measuring section A-A are arranged identically;
the measuring points of the first temperature measuring section C-C of the rod bundle comprise a plurality of groups of wall temperature measuring points and a plurality of groups of fluid temperature measuring points, and the wall temperature measuring points are positioned at the middle points of the valleys and the lobes of the spiral cross-shaped elements 1-9; the fluid temperature measurement points are located in the fluid zones near the spiral cross elements 1-9; the measuring points of the first temperature measuring section C-C of the rod cluster and the second temperature measuring section D-D of the rod cluster are arranged identically.
As shown in fig. 4, as a preferred embodiment of the present invention, when the spiral cross members 1-9 are seven members, the first temperature measurement section C-C measurement point of the rod bundle channel flow heat transfer experimental device comprises a first rod bundle fluid temperature measurement point C-1, a second rod bundle fluid temperature measurement point C-2, a third rod bundle fluid temperature measurement point C-3, a fourth rod bundle fluid temperature measurement point C-4, a first element rod wall temperature measurement point C-5, a first element rod fluid temperature measurement point C-6, a second element rod wall temperature measurement point C-7, a second element rod wall temperature measurement point C-8, a third element rod fluid temperature measurement point C-17, a second element rod fluid temperature measurement point C-18, a third element rod temperature measurement point C-3, a fourth element rod temperature measurement point C-4, a first element rod wall temperature measurement point C-5, a second element rod wall temperature measurement point C-6, a second element rod wall temperature measurement point C-7, a second element rod wall temperature measurement point C-8, a third element rod temperature measurement point C-17, a third element rod temperature measurement point C-18, a temperature measurement point C-4 a fourth element rod wall temperature first measuring point C-19, a fourth element rod wall temperature second measuring point C-20, a fourth element rod wall temperature third measuring point C-21, a fifth element rod wall temperature first measuring point C-9, a fifth element rod wall temperature second measuring point C-11, a fifth element rod fluid temperature first measuring point C-10, a sixth element rod wall temperature first measuring point C-15, a sixth element rod wall temperature second measuring point C-16, a seventh element rod wall temperature first measuring point C-12, a seventh element rod wall temperature second measuring point C-13 and a seventh element rod fluid temperature third measuring point C-14; a first measuring point C-5 of the wall temperature of the first element rod, a first measuring point C-7 of the wall temperature of the second element rod, a second measuring point C-8 of the wall temperature of the second element rod, a second measuring point C-11 of the wall temperature of the fifth element rod, a third measuring point C-14 of the fluid temperature of the seventh element rod, a first measuring point C-15 of the wall temperature of the sixth element rod, a first measuring point C-19 of the wall temperature of the fourth element rod and a third measuring point C-21 of the wall temperature of the fourth element rod are positioned at the middle points of the vanes of the spiral cross-shaped elements 1-9; a fifth element rod wall temperature first measuring point C-9, a seventh element rod wall temperature first measuring point C-12, a seventh element rod wall temperature second measuring point C-13, a sixth element rod wall temperature second measuring point C-16 and a fourth element rod wall temperature second measuring point C-20 are positioned at the middle point of a leaf valley of the spiral cross-shaped element; the first measuring point C-1 of the temperature of the rod cluster fluid, the second measuring point C-2 of the temperature of the rod cluster fluid, the third measuring point C-3 of the temperature of the rod cluster fluid, the fourth measuring point C-4 of the temperature of the rod cluster fluid, the first measuring point C-6 of the temperature of the first element rod fluid, the first measuring point C-10 of the temperature of the fifth element rod fluid, the first measuring point C-17 of the temperature of the third element rod fluid and the second measuring point C-18 of the temperature of the third element rod fluid are positioned in fluid areas near seven spiral cross-shaped elements 1-9; and the measuring points of the second temperature measuring section D-D of the rod cluster and the first temperature measuring section C-C of the rod cluster are arranged identically.
inbase:Sub>A preferred embodiment of the invention, in the single-rod first temperature measuring section A-A, the single-rod second temperature measuring section B-B, the rod cluster first temperature measuring section C-C and the rod cluster second temperature measuring section D-D,base:Sub>A wall temperature measuring point andbase:Sub>A fluid temperature measuring point adopt K-type thermocouples, and the thermocouples of the wall temperature measuring points are welded on the outer wall surfaces of the spiral cross-shaped elements 1-9 by brazing; thermocouple signal leads of a first element rod fluid temperature first measuring point C-6, a fifth element rod fluid temperature first measuring point C-10, a third element rod fluid temperature first measuring point C-17, a third element rod fluid temperature second measuring point C-18 and a wall temperature measuring point are led out from the upper sealing assembly 1-1 through an inner hollow tube of the spiral cross-shaped element.
The experimental method realized by the spiral cross-shaped single-rod and rod bundle channel flow heat transfer experimental device is realized by the following steps:
the method comprises the following steps: testing the working performance of the K-type thermocouple on the first single-rod temperature measuring section A-A, the second single-rod temperature measuring section B-B, the first rod bundle temperature measuring section C-C and the second rod bundle temperature measuring section D-D;
step two: connecting inlet connecting pipes of a lower chamber 1-18 and outlet connecting pipes of an upper chamber 1-21 of the experimental device with connecting pipes of an experimental loop; two interfaces of a first differential pressure transmitter 1-22 are respectively connected with a first pressure guiding pipe 1-17-1 and a third pressure guiding pipe 1-17-3; two interfaces of a second differential pressure transmitter 1-23 are respectively connected with a second pressure guiding pipe 1-17-2 and a fourth pressure guiding pipe 1-17-4;
step three: setting the spiral cross-shaped elements 1-9 as single rods, then setting the experimental device as a spiral cross-shaped single-rod channel flow heat transfer experimental device, developing a flow resistance experiment of the spiral cross-shaped single-rod channel flow heat transfer experimental device, adjusting the flow of an experimental loop and the temperature of fluid of an inlet connecting pipe of the spiral cross-shaped single-rod channel flow heat transfer experimental device, and simultaneously recording the readings of the first differential pressure transmitters 1-22 and the second differential pressure transmitters 1-23; completing different experimental working conditions;
step four: setting the spiral cross-shaped elements 1-9 as single rods, then setting the experimental device as a spiral cross-shaped single-rod channel flow heat transfer experimental device, developing a heat transfer experiment of the spiral cross-shaped single-rod channel flow heat transfer experimental device, adjusting the current of a low-voltage direct-current power supply connected with the upper conductive copper bars 1-3 and the lower conductive copper bars 1-12 of the single-rod channel flow heat transfer experimental device, and heating by using the resistance of the spiral cross-shaped elements 1-9; adjusting the flow of the experiment loop; fixing the fluid temperature of an inlet connecting pipe and the fluid temperature of an outlet connecting pipe of the spiral cross-shaped single-rod channel flow heat transfer experimental device; simultaneously recording temperature measurement values of the single-rod first temperature measurement section A-A and the single-rod second temperature measurement section B-B; completing different experimental working conditions;
step five: setting the spiral cross-shaped elements 1-9 as the rod bundles, wherein the experimental device is a spiral cross-shaped rod bundle channel flow heat transfer experimental device, and connecting inlet connecting pipes of a lower chamber 1-18 and outlet connecting pipes of an upper chamber 1-21 of the spiral cross-shaped rod bundle channel flow heat transfer experimental device with connecting pipes of an experimental loop; two interfaces of a first differential pressure transmitter 1-22 are respectively connected with a first pressure leading pipe 1-17-1 and a third pressure leading pipe 1-17-3; two interfaces of a second differential pressure transmitter 1-23 are respectively connected with a second pressure leading pipe 1-17-2 and a fourth pressure leading pipe 1-17-4;
step six: setting the spiral cross-shaped elements 1-9 as the rod bundles, then setting the experimental device as a spiral cross-shaped rod bundle channel flow heat transfer experimental device, developing a flow resistance experiment of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, adjusting the flow of an experimental loop and the temperature of fluid of an inlet connecting pipe of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, and simultaneously recording the readings of the first differential pressure transmitter 1-22 and the second differential pressure transmitter 1-23; completing different experimental working conditions;
step seven: setting the spiral cross-shaped elements 1-9 as the rod bundles, then setting the experimental device as a spiral cross-shaped rod bundle channel flow heat transfer experimental device, developing a heat transfer experiment of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, adjusting the current of a low-voltage direct-current power supply connected with the upper conductive copper bars 1-3 and the lower conductive copper bars 1-12 of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, and heating by using the resistors of the spiral cross-shaped elements 1-9; adjusting the flow of the experiment loop; fixing the fluid temperature of an inlet connecting pipe and the fluid temperature of an outlet connecting pipe of the spiral cross-shaped rod bundle channel flow heat transfer experimental device; simultaneously recording temperature measurement values of the first temperature measurement section C-C and the second temperature measurement section D-D of the rod cluster; different experimental conditions are completed.
Claims (9)
1. The utility model provides a cross single rod of spiral and rod bundle passageway flow heat transfer experimental apparatus which characterized in that:
the experimental device comprises an upper sealing assembly (1-1), an upper end cover flange (1-2), an upper conductive copper bar (1-3), an upper conductive head (1-4), a conductive sleeve (1-5), a positioning block (1-6), a shell barrel (1-7), an insulating part (1-8), a spiral cross-shaped element (1-9), a positioning barrel (1-10), a lower conductive head (1-11), a lower conductive copper bar (1-12), a lower sealing cover (1-13), a lower end cover flange (1-14), an insulating sealing part (1-15), a copper braid (1-16), a pressure leading pipe (1-17), a lower cavity (1-18), a positioning grid (1-19), a fastening bolt and nut (1-20), an upper cavity (1-21), a first differential pressure transmitter (1-22) and a second differential pressure transmitter (1-23); the spiral cross-shaped element (1-9) is positioned in the experimental device, the upper part of the spiral cross-shaped element (1-9) is in interference connection with the upper sealing component (1-1), and the upper sealing component (1-1) is in interference connection with the upper conductive head (1-4) through the conductive sleeve (1-5); the upper sealing component (1-1), the upper end cover flange (1-2) and the upper conductive copper bar (1-3) are connected by fastening bolts and nuts (1-20) and insulating sealing elements (1-15); the lower part of the upper conductive head (1-4) is provided with a positioning block (1-6), and the positioning block (1-6) is in contact with the circumferential surface of the upper sealing component (1-1) to limit the transverse displacement of the upper sealing component (1-1); the lower chamber (1-18) is provided with an inlet connecting pipe, the upper chamber (1-21) is provided with an outlet connecting pipe, and the shell cylinder (1-7), the lower chamber (1-18) and the upper chamber (1-21) are connected by welding; the shell cylinder (1-7) is in interference connection with the insulating part (1-8), a spiral cross element (1-9) is arranged in the insulating part (1-8), and a positioning grid (1-19) is positioned between the insulating part (1-8) and the spiral cross element (1-10) and plays a role in fixing the spiral cross element (1-10); the lower parts of the spiral cross-shaped elements (1-9) are fixed by positioning cylinders (1-10), and the spiral cross-shaped elements (1-9) are connected with lower conductive heads (1-11) through copper braids (1-16); the lower conductive copper bar (1-12) is arranged between the lower conductive head (1-11) and the lower sealing cover (1-13), and the lower conductive copper bar (1-12), the lower sealing cover (1-13) and the lower end cover flange (1-14) are connected by adopting a fastening bolt and a nut (1-20) and an insulating sealing element (1-15);
when the spiral cross-shaped element (1-9) isbase:Sub>A single rod, the temperature measuring section of the experimental device comprisesbase:Sub>A first temperature measuring section (A-A) of the single rod andbase:Sub>A second temperature measuring section (B-B) of the single rod;
when the spiral cross-shaped elements (1-9) are rod bundles, the temperature measuring sections of the experimental device comprise a first temperature measuring section (C-C) of the rod bundles and a second temperature measuring section (D-D) of the rod bundles.
2. The spiral cross-shaped single rod and bundle channel flow heat transfer experimental apparatus of claim 1, wherein: the insulating parts (1-8) are insulating flow channel tubes in the experimental setup when the spiral-shaped elements (1-9) are single rods, and insulating flow channel plates in the experimental setup when the spiral-shaped elements (1-9) are bundles of rods; the insulating runner pipe and the insulating runner plate are made of polyether-ether-ketone.
3. The spiral cross-shaped single rod and bundle channel flow heat transfer experimental apparatus of claim 1, characterized in that: when the spiral cross-shaped elements (1-9) are single rods, a single element is arranged in the experimental device; when the spiral cross-shaped elements (1-9) are rod bundles, a plurality of elements are arranged in the experimental device; the positioning blocks (1-6) are single when the screw cross members (1-9) are single rods, and the number of positioning blocks (1-6) is the same as the number of screw cross members (1-9) in a bundle when the screw cross members (1-9) are bundles.
4. The spiral cross-shaped single rod and bundle channel flow heat transfer experimental apparatus of claim 1, wherein: the shell barrel (1-7) comprises an upper barrel, a middle barrel and a lower barrel, and the upper barrel and the middle barrel and the lower barrel are connected through fastening bolts, nuts and insulating sealing elements.
5. The spiral cross-shaped single rod and bundle channel flow heat transfer experimental apparatus of claim 1, characterized in that: the pressure guiding pipes (1-17) comprise a first pressure guiding pipe (1-17-1), a second pressure guiding pipe (1-17-2), a third pressure guiding pipe (1-17-3) and a fourth pressure guiding pipe (1-17-4); the first pressure guiding pipe (1-17-1) and the third pressure guiding pipe (1-17-3) are used for measuring the pressure difference of an experimental device, the second pressure guiding pipe (1-17-2) and the fourth pressure guiding pipe (1-17-4) are used for measuring the pressure difference of the experimental device, and the two groups of pressure differences can be mutually corrected; the shell comprises a shell barrel body (1-7), wherein a pressure guiding pipe (1-17-1) is vertically welded on the shell barrel body (1-7), a first pressure guiding pipe (1-17-1) is arranged at a position close to the lower part of an upper cavity (1-21), a second pressure guiding pipe (1-17-2) is arranged at a position close to the lower part of the first pressure guiding pipe (1-17-1), a third pressure guiding pipe (1-17-3) and a fourth pressure guiding pipe (1-17-4) are arranged below the first pressure guiding pipe (1-17-1) and the second pressure guiding pipe (1-17-2), and the vertical distance between the first pressure guiding pipe (1-17-1) and the third pressure guiding pipe (1-17-3) is equal to the vertical distance between the second pressure guiding pipe (1-17-2) and the fourth pressure guiding pipe (1-17-4).
6. The spiral cross-shaped single rod and bundle channel flow heat transfer experimental apparatus of claim 1, wherein: the measuring points of the single-rod first temperature measuring section (A-A) comprisebase:Sub>A single-rod wall temperature first measuring point (A-1),base:Sub>A single-rod wall temperature second measuring point (A-2),base:Sub>A fluid temperature first measuring point (A-3) andbase:Sub>A fluid temperature second measuring point (A-4), the single-rod wall temperature first measuring point (A-1) is located at the middle point ofbase:Sub>A leaf of the spiral cross-shaped element (1-9), the single-rod wall temperature second measuring point (A-2) is located at the middle point ofbase:Sub>A leaf valley of the spiral cross-shaped element (1-9), and the fluid temperature first measuring point (A-3) and the fluid temperature second measuring point (A-4) are located inbase:Sub>A fluid area near the leaf valley of the spiral cross-shaped element (1-9); the measuring points of the second temperature measuring section (B-B) of the single rod and the first temperature measuring section (A-A) of the single rod are arranged identically;
the measuring points of the first temperature measuring section (C-C) of the rod bundle comprise a plurality of groups of wall temperature measuring points and a plurality of groups of fluid temperature measuring points, and the wall temperature measuring points are positioned at the middle points of the valleys and the lobes of the spiral cross-shaped elements (1-9); the fluid temperature measuring point is positioned in the fluid area near the spiral cross-shaped elements (1-9); the measuring points of the first temperature measuring section (C-C) and the second temperature measuring section (D-D) of the rod cluster are arranged the same.
7. The spiral cross-shaped single rod and bundle channel flow heat transfer experimental apparatus of claim 6, characterized in that: when the spiral cross-shaped elements (1-9) are seven elements, the measuring points of the first temperature measuring section (C-C) of the rod bundle channel flow heat transfer experimental device comprise a first rod bundle fluid temperature measuring point (C-1), a second rod bundle fluid temperature measuring point (C-2), a third rod bundle fluid temperature measuring point (C-3), a fourth rod bundle fluid temperature measuring point (C-4), a first element rod wall temperature measuring point (C-5), a first element rod fluid temperature measuring point (C-6), a second element rod wall temperature measuring point (C-7), a second element rod wall temperature measuring point (C-8), a first third element rod fluid temperature measuring point (C-17) a third element rod fluid temperature second measuring point (C-18), a fourth element rod wall temperature first measuring point (C-19), a fourth element rod wall temperature second measuring point (C-20), a fourth element rod wall temperature third measuring point (C-21), a fifth element rod wall temperature first measuring point (C-9), a fifth element rod wall temperature second measuring point (C-11), a fifth element rod fluid temperature first measuring point (C-10), a sixth element rod wall temperature first measuring point (C-15), a sixth element rod wall temperature second measuring point (C-16), a seventh element rod wall temperature first measuring point (C-12), a seventh element rod wall temperature second measuring point (C-13), A seventh element rod fluid temperature third measuring point (C-14); a first measuring point (C-5) of the wall temperature of the first element rod, a first measuring point (C-7) of the wall temperature of the second element rod, a second measuring point (C-8) of the wall temperature of the second element rod, a second measuring point (C-11) of the wall temperature of the fifth element rod, a third measuring point (C-14) of the fluid temperature of the seventh element rod, a first measuring point (C-15) of the wall temperature of the sixth element rod, a first measuring point (C-19) of the wall temperature of the fourth element rod and a third measuring point (C-21) of the wall temperature of the fourth element rod are positioned at the middle point of the leaf of the spiral cross-shaped element (1-9); a fifth element rod wall temperature first measuring point (C-9), a seventh element rod wall temperature first measuring point (C-12), a seventh element rod wall temperature second measuring point (C-13), a sixth element rod wall temperature second measuring point (C-16) and a fourth element rod wall temperature second measuring point (C-20) are positioned at the middle point of the leaf valley of the spiral cross-shaped element; the rod cluster fluid temperature measuring device comprises a rod cluster fluid temperature first measuring point (C-1), a rod cluster fluid temperature second measuring point (C-2), a rod cluster fluid temperature third measuring point (C-3), a rod cluster fluid temperature fourth measuring point (C-4), a first element rod fluid temperature first measuring point (C-6), a fifth element rod fluid temperature first measuring point (C-10), a third element rod fluid temperature first measuring point (C-17) and a third element rod fluid temperature second measuring point (C-18), wherein the rod cluster fluid temperature first measuring point (C-1), the rod cluster fluid temperature second measuring point (C-2), the rod cluster fluid temperature third measuring point (C-3), the fifth element rod fluid temperature first measuring point (C-10), the third element rod fluid temperature first measuring point (C-17) and the third element rod fluid temperature second measuring point (C-18) are located in fluid areas near seven spiral cross-shaped elements (1-9); the measuring points of the second temperature measuring section (D-D) of the rod cluster and the first temperature measuring section (C-C) of the rod cluster are arranged the same.
8. The spiral cross-shaped single rod and bundle channel flow heat transfer experimental apparatus of claim 6, characterized in that: in the single-rod first temperature measuring section (A-A), the single-rod second temperature measuring section (B-B), the rod cluster first temperature measuring section (C-C) and the rod cluster second temperature measuring section (D-D),base:Sub>A wall temperature measuring point andbase:Sub>A fluid temperature measuring point adopt K-type thermocouples, and the thermocouples of the wall temperature measuring point are welded on the outer wall surfaces of the spiral cross-shaped elements (1-9) by brazing; thermocouple signal leads of a first element rod fluid temperature first measuring point (C-6), a fifth element rod fluid temperature first measuring point (C-10), a third element rod fluid temperature first measuring point (C-17), a third element rod fluid temperature second measuring point (C-18) and a wall temperature measuring point are led out from the upper sealing assembly (1-1) through an internal hollow tube of the spiral cross-shaped element.
9. The experimental method of a spiral cross-shaped single rod and rod bundle channel flow heat transfer experimental device of any one of claims 1 to 8, characterized in that: the method is realized by the following steps:
the method comprises the following steps: testing the working performance of the K-type thermocouple on the first temperature measuring section (A-A) of the single rod, the second temperature measuring section (B-B) of the single rod, the first temperature measuring section (C-C) of the rod cluster and the second temperature measuring section (D-D) of the rod cluster;
step two: connecting an inlet connecting pipe of a lower chamber (1-18) and an outlet connecting pipe of an upper chamber (1-21) of the experimental device with a connecting pipe of an experimental loop; two interfaces of a first differential pressure transmitter (1-22) are respectively connected with a first pressure guiding pipe (1-17-1) and a third pressure guiding pipe (1-17-3); two interfaces of a second differential pressure transmitter (1-23) are respectively connected with a second pressure guiding pipe (1-17-2) and a fourth pressure guiding pipe (1-17-4);
step three: setting the spiral cross-shaped elements (1-9) as single rods, then setting the experimental device as a spiral cross-shaped single-rod channel flow heat transfer experimental device, developing a flow resistance experiment of the spiral cross-shaped single-rod channel flow heat transfer experimental device, adjusting the flow of an experimental loop and the temperature of fluid of an inlet connecting pipe of the spiral cross-shaped single-rod channel flow heat transfer experimental device, and simultaneously recording the readings of the first differential pressure transmitter (1-22) and the second differential pressure transmitter (1-23); completing different experimental working conditions;
step four: setting the spiral cross-shaped element (1-9) as a single rod, then setting the experimental device as a spiral cross-shaped single rod channel flow heat transfer experimental device, developing a heat transfer experiment of the spiral cross-shaped single rod channel flow heat transfer experimental device, adjusting the current of a low-voltage direct-current power supply connected with an upper conductive copper bar (1-3) and a lower conductive copper bar (1-12) of the single rod channel flow heat transfer experimental device, and heating by using the resistance of the spiral cross-shaped element (1-9); adjusting the flow of the experiment loop; fixing the fluid temperature of an inlet connecting pipe and the fluid temperature of an outlet connecting pipe of the spiral cross-shaped single-rod channel flow heat transfer experimental device; simultaneously recording temperature measurement values of the single-rod first temperature measurement section (A-A) and the single-rod second temperature measurement section (B-B); completing different experimental working conditions;
step five: setting the spiral cross-shaped elements (1-9) as the rod bundles, then setting the experimental device as a spiral cross-shaped rod bundle channel flow heat transfer experimental device, and connecting inlet connecting pipes of lower chambers (1-18) and outlet connecting pipes of upper chambers (1-21) of the spiral cross-shaped rod bundle channel flow heat transfer experimental device with connecting pipes of an experimental loop; two interfaces of a first differential pressure transmitter (1-22) are respectively connected with a first pressure guiding pipe (1-17-1) and a third pressure guiding pipe (1-17-3); two interfaces of a second differential pressure transmitter (1-23) are respectively connected with a second pressure guiding pipe (1-17-2) and a fourth pressure guiding pipe (1-17-4);
step six: setting the spiral cross-shaped elements (1-9) as the rod bundles, then setting the experimental device as a spiral cross-shaped rod bundle channel flow heat transfer experimental device, developing a flow resistance experiment of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, adjusting the flow of an experimental loop and the temperature of fluid of an inlet connecting pipe of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, and simultaneously recording the readings of the first differential pressure transmitter (1-22) and the second differential pressure transmitter (1-23); completing different experimental working conditions;
step seven: setting the spiral cross-shaped elements (1-9) as the rod bundles, then setting the experimental device as a spiral cross-shaped rod bundle channel flow heat transfer experimental device, developing a heat transfer experiment of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, adjusting the current of a low-voltage direct-current power supply connected with upper conductive copper bars (1-3) and lower conductive copper bars (1-12) of the spiral cross-shaped rod bundle channel flow heat transfer experimental device, and heating by using the resistance of the spiral cross-shaped elements (1-9); adjusting the flow of the experiment loop; the fluid temperature of an inlet connecting pipe and the fluid temperature of an outlet connecting pipe of the fixed spiral cross-shaped rod bundle channel flow heat transfer experimental device are measured; simultaneously recording temperature measurement values of the first temperature measurement section (C-C) and the second temperature measurement section (D-D) of the rod cluster; different experimental conditions are completed.
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