CN114942145A

CN114942145A - Single-side high-temperature equal-heat-flow heating experimental device for regenerative cooling structure

Info

Publication number: CN114942145A
Application number: CN202210556103.0A
Authority: CN
Inventors: 董苯思; 肖添翼; 徐国强; 闻洁; 全永凯; 陈鸿嘉
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-08-26
Anticipated expiration: 2042-05-20
Also published as: CN114942145B

Abstract

The invention discloses a single-side high-temperature equal heat flow heating experimental device facing a regenerative cooling structure, which comprises a base, a test piece and equal heat flow heating sources, wherein a clamping groove is formed in the top surface of the base, the equal heat flow heating sources are installed on the bottom surface of the clamping groove, a cooling working medium flow channel is arranged in the test piece, one end, parallel to the flow direction of the cooling working medium in the test piece, of the test piece is connected with the heat output end of the equal heat flow heating sources in a fitting mode, and the two ends of the cooling working medium flow channel are connected with the outside through connecting pipes. According to the invention, the isothermal heat flow heating source is arranged on one surface of the test piece, so that the single-surface heat flow input condition of the regenerative cooling structure is met, the current situation of numerical simulation research is changed, and a platform is provided for regenerative cooling test research; the invention is based on the electric heating mode in the traditional hydrocarbon fuel flowing heat exchange experiment, realizes the flexible adjustment of the input heat flux density through an external direct current power supply, has wider test working condition range, and can provide accurate isothermal heat flux environment for the regenerative cooling experiment.

Description

Single-side high-temperature equal-heat-flow heating experimental device for regenerative cooling structure

Technical Field

The invention belongs to the technical field of heat exchange experimental research, and particularly relates to a single-side high-temperature equal-heat-flow heating experimental device for a regenerative cooling structure.

Background

The hypersonic aircraft propelled by the ramjet engine is a research and development hotspot problem in the aerospace field in recent years, the extremely high pneumatic thermal load caused by the hypersonic Mach number and the extremely high temperature generated by combustion of a hydrocarbon fuel propellant exceed the bearing capacity of the existing material, and one of the keys of designing the hypersonic aircraft is to solve the thermal protection problem of the aircraft, in particular the cooling problem of a combustion chamber of the ramjet engine. Regenerative cooling is a cooling method commonly used in ramjet engines, and usually uses liquid fuel used by the engine itself as a cooling medium. The liquid fuel flows in the cooling channel inside the wall surface of the high-temperature component in the reverse direction with the external high-temperature gas, and absorbs heat through forced convection heat exchange, so that the temperature of the wall surface is reduced. When the liquid fuel leaves the high-temperature part, on one hand, the high-temperature part is cooled, and on the other hand, the liquid fuel enters the combustion chamber at a higher temperature, so that the energy regeneration is realized.

The typical heat boundary condition faced by the regenerative cooling structure is a single-side heat flow input condition, but at present, the related research of domestic regenerative cooling mainly adopts numerical simulation as a main part, and the experimental research is relatively less, or the related research is carried out by imitating the commonly-used heat flow input condition of uniformly distributed heat flow on each wall surface in the traditional hydrocarbon fuel flow heat exchange characteristic test. Therefore, it is desirable to design a test stand that is more closely related to the actual regenerative cooling thermal environment and is feasible in engineering tests.

The present invention has been made in view of this situation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a single-side high-temperature isothermal heating experimental device for a regenerative cooling structure. In order to solve the technical problems, the invention adopts the technical scheme that:

the utility model provides a thermal current heating experimental apparatus such as single face high temperature towards regeneration cooling structure, includes base, test piece, wait the hot current and add the heat source, the base top surface is equipped with the draw-in groove, wait the hot current and add the heat source and install in the draw-in groove bottom surface, the inside cooling working medium runner that is equipped with of test piece, the test piece is rather than the parallel one end of inside cooling working medium flow direction and the laminating of the thermal output end of waiting the hot current to add the heat source and be connected, the both ends of cooling working medium runner are passed through the connecting pipe and are connected with the external world.

Further, when the heat source includes conductive screw, conductive coating, the both ends of base are equipped with the notch, be equipped with square tenon on the lateral wall of notch, the lateral wall of screwhead corresponds the square tongue-and-groove that sets up and square tenon joint, the conductive screw top surface flushes with base draw-in groove bottom surface, conductive coating covers draw-in groove bottom surface and conductive screw top surface setting, external power supply with conductive screw electricity be connected, conductive coating coats and is stamped insulating coating, insulating coating's another side and test piece laminating set up, the base adopts insulating material to make.

Furthermore, a plurality of thermocouple jacks extending towards the top surface are uniformly arranged on the bottom surface of the base, and thermocouples are installed in the thermocouple jacks.

Furthermore, a pressure tapping pipe is installed on the test piece, one end of the pressure tapping pipe is communicated with the cooling working medium flow passage through a pressure tapping hole, the other end of the pressure tapping pipe is connected with a pressure sensor, and the pressure tapping pipe is arranged close to the connecting pipe.

Furthermore, a liquid collecting cavity is arranged inside the test piece, and two ends of the cooling working medium flow channel are respectively communicated with the connecting pipe through the liquid collecting cavity.

Further, base, testpieces all are the rectangle, the draw-in groove sets up along the major axis direction, and its width is the same with the testpieces, the testpieces set up in the draw-in groove, be equipped with the gliding limit structure of restriction testpieces on the lateral wall of testpieces.

Further, the test piece is made of Inconel718 high-temperature alloy.

Further, the conductive coating is made of a nickel-chromium alloy material.

Further, the insulating coating is made of an aluminum nitride material.

Furthermore, the base is made of alumina.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.

The invention provides a test device by arranging the equal heat flow heating source on one surface of a test piece to meet the single-surface heat flow input condition of a regenerative cooling structure, changes the current situation of the current regenerative cooling field mainly based on numerical simulation research, and provides a platform for regenerative cooling test research; the invention is based on the electric heating mode in the traditional hydrocarbon fuel flowing heat exchange experiment, realizes the flexible adjustment of the input heat flux density through an external direct current power supply, has wider test working condition range, and can provide accurate isothermal heat flux environment for the regenerative cooling experiment.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding 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 invention without limiting the invention to its proper form. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of the assembly of the apparatus of the present invention;

FIG. 2 is a schematic partial cross-sectional view of a test piece of the present invention;

figure 3 is a schematic view in partial cross-section of the base of the present invention.

In the figure: 1-a test piece; 2-insulating coating; 3-a conductive coating; 4-a base; 5-a conductive screw; 11-a connecting tube; 12-a liquid collection cavity; 13-pressure sampling pipe; 14-a limit structure; 15-pressure tapping; 16-a cooling working medium flow channel; 41-card slot; 42-square tenon; 43-thermocouple insertion holes; 51-square tongue-and-groove; 52-thread.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it for those skilled in the art by reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 1 to 3, the single-sided high-temperature equal-heat-flow heating experimental device for the regenerative cooling structure in the embodiment includes a base 4, a test piece 1, and equal-heat-flow heating sources, wherein a clamping groove 41 is formed in a top surface of the base 4, the equal-heat-flow heating sources are installed at a bottom of the clamping groove 41, a cooling working medium flow channel 16 is formed inside the test piece 1, an end surface of the test piece 1 parallel to a flowing direction of an internal cooling working medium is attached to a heat output end of the equal-heat-flow heating sources, and two ends of the cooling working medium flow channel 16 are connected with the outside through a connecting pipe 11. The connecting pipe 11 is connected with other subsystems on the test bed through the ferrule connector, the cooling working medium is input to the cooling working medium flow passage 16 through the connecting pipe 11, and one side of the cooling working medium close to the isothermal heating source is heated under the action of the isothermal heating source, so that single-sided heat exchange is realized. The current situation of numerical simulation research is changed, the single-side heat flow input condition of the regenerative cooling structure is met, and a platform is provided for regenerative cooling test research. The material of the test piece 1 is selected from a metal material which is suitable for additive manufacturing and is high-temperature resistant, and preferably, the embodiment adopts Inconel718 high-temperature alloy.

The constant-heat-flow heating source comprises a conductive screw 5 and a conductive coating 3, notches are formed in two ends of a base 4, a square tenon 42 is arranged on the side wall of each notch, a square mortise 51 clamped with the square tenon 42 is correspondingly arranged on the side wall of each screw head, the top surface of the conductive screw 5 is flush with the bottom surface of a clamping groove 41 of the base 4, the conductive coating 3 covers the bottom surface of the clamping groove 41 and the top surface of the conductive screw 5, and an external power supply is electrically connected with the conductive screw 5. The conductive screw 5 has a thread 52 at the lower part for connecting with a conductive wire and a square mortise 51 for matching with the base 4. The conductive coating 3 is coated on the upper surface of the conductive screw 5 and the clamping groove 41 of the base 4 in a spraying mode, a conductive loop can be formed, and the conductive coating can be used as a heating source after the conductive screw 5 is electrified. Based on the electric heating mode in the flowing heat exchange experiment of the traditional hydrocarbon fuel, the flexible adjustment of the input heat flux density is realized through an external direct-current power supply, the test working condition range is wider, and the accurate isothermal heat flux thermal environment can be provided for the regenerative cooling experiment. The conductive coating 3 is made of a good conductor and has relatively high resistivity so as to ensure that the heating power is still high-current and low-voltage heating under a working condition with high heating power, and preferably, nichrome is adopted in the embodiment. The conductive coating 3 is covered with an insulating coating 2, and the other side of the insulating coating 2 is attached to the test piece 1. The insulating coating 2 is sprayed on the conductive coating 3, and mainly functions to perform insulating treatment between the test piece 1 and the conductive coating 3 to realize single-sided heating. The insulating coating 2 is selected to have good insulating property and relatively large heat conductivity coefficient so as to reduce the temperature measurement error of the bottom surface of the test piece 1, and preferably, aluminum nitride is adopted in the embodiment. The base 4 is made of an insulating material, the base 4 is made of a material which has good insulating property, relatively low heat conductivity coefficient and is convenient to process and manufacture, and preferably, the embodiment adopts aluminum oxide as an example.

The structural style of the test piece 1 can be adjusted and changed according to different experimental requirements, the base 4 and the test piece 1 are rectangular, the cooling working medium flow channel can be linear, snake-shaped and square-shaped, the specific shape structure can be flexibly adjusted according to different experimental requirements, and the linear type is used as an example in the embodiment. The card slot 41 is arranged along the long axis direction, and has the same width as the test piece 1. A plurality of thermocouple jacks 43 are uniformly arranged on the bottom surface of the base 4, and thermocouples are arranged in the thermocouple jacks 43. The base, namely the part of the base which goes downwards from the conductive coating is a heat insulation boundary, theoretically, the temperature of the opening on the surface of the clamping groove 41 is consistent with that of the conductive coating, and the actual error can be ignored; the thickness of the insulating coating layer affects the measurement of the bottom surface temperature, and the result correction based on the physical properties of the insulating coating layer, that is, the temperature of the bottom of the test piece 1 is measured by the thermocouple, is considered in the actual test. The temperature parameters are obtained, and the relation among the flow speed, the pressure and the temperature of the cooling working medium in the test piece 1 can be more intuitively known. The pressure sampling pipe 13 is installed on the test piece 1, the pressure sampling pipe 13 is communicated with the cooling working medium flow passage 16 through a pressure sampling hole 15, the pressure sampling pipe 13 is arranged close to the connecting pipe 11, and the pressure sampling pipe 13 is connected with a pressure sensor and used for measuring the pressure of an inlet and an outlet of the regenerative cooling structure. Preferably, the pressure tapping pipe 13 is L-shaped. A liquid collecting cavity 12 is formed in the test piece 1, and two ends of a cooling working medium flow channel 16 are respectively communicated with the connecting pipe 11 through the liquid collecting cavity 12. And the liquid collecting cavities 12 on the two sides are used for storing a certain volume of cooling working medium and ensuring that the flow of the working medium distributed to each channel is uniform.

The test piece 1 is arranged in the clamping groove 41, and in order to maintain the stability of the test piece 1 in the clamping groove 41, a limiting structure 14 for limiting the test piece 1 to slide is arranged on the side wall of the test piece 1. The limiting structure 14 only needs to have a certain limiting effect on the sliding of the experimental part, and here, only a simple structural form is listed, for example: be equipped with the plush copper on the lateral wall of testpieces 1, be equipped with the spout on the corresponding draw-in groove 41 lateral wall, testpieces 1 places on insulating coating 2 along the spout, plush copper and spout sliding connection to can play limiting displacement to testpieces 1.

Overall test procedure when mounting was performed: before the experiment, the conductive screws 5 are connected and installed to the two ends of the base 4 through the square tenons 42, the conductive coatings 3 and the insulating coatings 2 are sequentially sprayed on the conductive screws 5 and the clamping grooves 41 of the base 4 in an ultrasonic spraying mode, and the wiring lugs on the output wires of the direct-current power supply are sleeved on the conductive screws 5 and screwed down to form an electric heating loop; the test piece 1 is arranged in the clamping groove 41 and clamped by the limiting structure 14 to limit sliding displacement. During the experiment, the clamping sleeve joint is connected with the connecting pipe 11 and screwed down, the connecting pipe is connected into a working medium circulation loop of the test bed, and the pressure sampling pipe 13 is connected with the pressure/differential pressure sensor in the same way, so that the inlet and outlet pressure can be conveniently measured during the experiment; an armored thermocouple was plugged into the thermocouple insertion hole 43 under the base plate 4 to measure the bottom temperature of the test piece 1. The experimental device is based on an electric heating mode in the traditional hydrocarbon fuel flowing heat exchange experiment, and according to a single-side heating boundary condition faced by regenerative cooling, the regenerative cooling test piece 1 is heated by adopting an indirect electric heating method, so that the flexible adjustment of the input heat flux density can be realized through an external direct-current power supply, an accurate equal-heat-flux thermal environment is provided for the regenerative cooling experiment, and a platform is provided for the research of the regenerative cooling experiment in engineering.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a single face high temperature isopyretic heat flow heating experimental apparatus towards regenerative cooling structure which characterized in that: including base (4), testpieces (1), wait hot stream heating source, base (4) top surface is equipped with draw-in groove (41), wait hot stream heating source installs at draw-in groove (41) bottom surface, testpieces (1) inside is equipped with cooling working medium runner (16), testpieces (1) are connected with the heat output end laminating of waiting hot stream heating source with the parallel one end of inside cooling working medium flow direction rather than testpieces (1), the both ends of cooling working medium runner (16) are passed through connecting pipe (11) and are connected with the external world.

2. The single-sided high-temperature isothermal heating experimental device facing the regenerative cooling structure according to claim 1, wherein: wait hot current heating source and include conductive screw (5), conductive coating (3), the both ends of base (4) are equipped with the notch, be equipped with square tenon (42) on the lateral wall of notch, the lateral wall of screwhead corresponds square tongue-and-groove (51) that sets up with square tenon (42) joint, conductive screw (5) top surface flushes with draw-in groove (41) bottom surface of base (4), conductive coating (3) cover draw-in groove (41) bottom surface and conductive screw (5) top surface setting, external power supply with conductive screw (5) electric connection, conductive coating (3) coats and is stamped insulating coating (2), the another side and the test piece (1) laminating setting of insulating coating (2), base (4) adopt insulating material to make.

3. The single-sided high-temperature isothermal heating experimental device facing the regenerative cooling structure according to claim 1, wherein: the base (4) bottom surface evenly is equipped with a plurality of thermocouple jack (43) that extend to the top surface, install the thermocouple in thermocouple jack (43).

4. The single-sided high-temperature isothermal heat flow heating experimental device facing the regenerative cooling structure of claim 1, characterized in that: the pressure tapping pipe (13) is installed on the test piece (1), one end of the pressure tapping pipe (13) is communicated with the cooling working medium flow channel (16) through a pressure tapping hole (15), the other end of the pressure tapping pipe is connected with the pressure sensor, and the pressure tapping pipe (13) is arranged close to the connecting pipe (11).

5. The single-sided high-temperature isothermal heat flow heating experimental device facing the regenerative cooling structure of claim 1, characterized in that: a liquid collecting cavity (12) is arranged inside the test piece (1), and two ends of the cooling working medium flow channel (16) are communicated with the connecting pipe (11) through the liquid collecting cavity (12) respectively.

6. The single-sided high-temperature isothermal heating experimental device facing the regenerative cooling structure according to claim 1, wherein: base (4), testpieces (1) all are the rectangle, draw-in groove (41) are along major axis to setting, and its width is the same with testpieces (1), testpieces (1) set up in draw-in groove (41), be equipped with on the lateral wall of testpieces (1) and restrict gliding limit structure (14) of testpieces (1).

7. The single-sided high-temperature isothermal heating experimental device facing the regenerative cooling structure according to claim 1, wherein: the test piece (1) is made of Inconel718 high-temperature alloy.

8. The single-sided high-temperature isothermal heating experimental device facing the regenerative cooling structure according to claim 2, wherein: the conductive coating (3) is made of nickel-chromium alloy.

9. The single-sided high-temperature isothermal heating experimental device facing the regenerative cooling structure according to claim 2, wherein: the insulating coating (2) is made of aluminum nitride.

10. The single-sided high-temperature isothermal heat flow heating experimental device facing the regenerative cooling structure of claim 1, characterized in that: the base (4) is made of alumina.