Sweating heat transfer simulation device and method

Abstract

The invention relates to a sweating heat transfer simulation device and method. The device comprises an infrared heating lamp (2) for heating a porous experiment piece (1); the position adjusting assembly (3) is used for adjusting the position of the infrared heating lamp (2); the fixing base (4) is used for mounting and fixing the porous experiment piece (1); and the fixed base (4) is provided with a liquid supply inlet and a measuring port. Compared with the prior art, the device can be used for simulating the sweating heat transfer process of the high-temperature surface of the porous part, and the change process of the surface heat dissipation condition under different hydraulic conditions, different porous styles and different heat flux densities is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of sweating heat transfer, and in particular to a sweating heat transfer simulation device and method. Background Art

[0002] The aerospace field is one of the future focuses of competition. With the advancement and cheapening of spacecraft, new heat transfer methods are needed compared to traditional ablation. Sweating heat transfer is to transport coolant to a high-temperature surface through porous materials. The coolant evaporates violently on the surface to form a steam layer, thereby isolating the heat flow and taking away the heat. There are currently many ways to simulate sweating heat transfer, such as wind tunnel experiments and high-temperature flame heating. However, of these two methods, the former requires the processing of an integral test piece and the configuration of a special test site, and the experimental cost is huge. The latter has the problem of difficulty in controlling the heat flow and the inability to accurately adjust the heat flow, and further quantitative research is difficult.

[0003] Patent CN 111855738 A discloses an experimental device for sweating cooling of sintered porous dielectric materials, wherein a pressure tank and a quartz heating tube are provided in a housing, a porous dielectric material test piece is provided on the upper part of the pressure tank, a thermocouple contacting the porous dielectric material test piece is provided in the cooling chamber, and a pressure transmitter is provided outside the pressure tank; the temperature of the porous dielectric material test piece is measured with an infrared thermal imager, and the sweating cooling process of the sintered porous dielectric material in a high temperature field can be obtained. However, it is difficult for the device to accurately and flexibly adjust the heat flow. Summary of the invention

[0004] The purpose of the present invention is to provide a sweating heat transfer simulation device and method to more accurately and flexibly adjust the heat flow.

[0005] The object of the present invention can be achieved by the following technical solution: A sweating heat transfer simulation device, comprising:

[0006] Infrared heating lamps for heating porous test pieces;

[0007] A position adjustment component for adjusting the position of the infrared heating lamp;

[0008] A fixed base for mounting and fixing porous test pieces;

[0009] The fixed base is provided with a liquid supply inlet and a measuring port.

[0010] In the present invention, the fixed base can be installed with the porous test piece and provide a coolant channel and a measurement interface.

[0011] Preferably, the position adjustment assembly includes an angle adjustment member and a height adjustment member;

[0012] The infrared heating lamp is installed on the angle adjusting member, and the angle adjusting member is installed on the height adjusting member.

[0013] Further preferably, the angle adjustment member includes two 180-degree angle adjustment plates.

[0014] Further preferably, the angle adjustment member includes a first angle adjustment plate and a second angle adjustment plate (i.e., two 180-degree angle adjustment plates), wherein the first angle adjustment plate includes a first plate body slidably connected to the height adjustment member and a second plate body vertically connected to the first plate body, and both the first plate body and the second plate body are provided with a 180-degree arc groove, the second adjustment plate includes a third plate body slidably connected to the arc groove of the second plate body and a fourth plate body vertically connected to the third plate body, the third plate body is provided with a 180-degree arc groove corresponding to the arc groove on the second plate body, and the fourth plate body is connected to an infrared heating lamp.

[0015] Preferably, the infrared heating lamp is symmetrically provided with two lifting ears, the fourth plate body is vertically connected to the support plate, the infrared heating lamp is installed on the support plate through the lifting ears and bolts, and moves with the adjustment plate.

[0016] Preferably, the height adjustment member is provided with a 180-degree arc groove corresponding to the arc groove on the first plate. The first plate can provide an angle adjustment of 180° in one direction by cooperating with the 180-degree arc groove on the height adjustment member, and the third plate can provide an angle adjustment of 180° in another direction by cooperating with the 180-degree arc groove on the second plate. When the adjustment is in place, the position can be locked by a fixing member such as a bolt.

[0017] Further preferably, the height adjustment member includes a slide groove and a slide plate slidably arranged on the slide groove, and the slide plate is provided with a 180-degree arc groove corresponding to the arc groove on the first plate body. When the slide plate moves up and down along the slide groove, the height of the angle adjustment member can be adjusted, and then the height of the infrared heating lamp can be adjusted. After being adjusted in place, the upper and lower positions are locked by fixing members such as bolts.

[0018] Preferably, the 180-degree arc groove is provided with a positioning hole for auxiliary positioning at the corresponding center of the circle. When adjusted in place, it can be locked by a fixing member such as a bolt.

[0019] Preferably, one end of the first plate body and the third plate body where the arc groove is provided has an arc-shaped structure.

[0020] Preferably, the porous test piece is fixed on the upper surface of the fixed base, and the infrared heating lamp is located above the porous test piece;

[0021] The fixed base body is provided with a liquid supply inlet and a measuring port.

[0022] Further preferably, the porous test piece is detachably mounted on the upper surface of the fixed base by a plurality of bolts arranged circumferentially;

[0023] The liquid supply inlet includes a cooling liquid inlet, and the measuring port includes a pressure interface.

[0024] More preferably, the coolant inlet is connected to a coolant delivery pipeline, and a micro pump and a flow meter are provided on the coolant delivery pipeline.

[0025] Preferably, the sweating heat transfer simulation device further comprises an infrared imaging camera for recording the surface temperature of the porous test piece.

[0026] Further preferably, the infrared imaging camera is connected to a data acquisition system.

[0027] More preferably, the data acquisition system includes a data collector and a computer, which can record temperature data.

[0028] Preferably, the infrared heating lamp is an infrared focusing lamp.

[0029] Further preferably, the infrared light inside the infrared heating lamp is focused by using a conical reflection surface.

[0030] More preferably, the infrared heating lamp adopts the IRS2100 infrared focusing lamp of Lamp Company, which has a maximum diameter of 58mm, a rated power of 150W, and is equipped with an optical reflector. The infrared rays generated can be focused in a circular or elliptical area for heating. At a distance of 30mm, 650kW / m can be achieved in a circular area with a diameter of 5mm. 2 The ultimate heat flux density.

[0031] Further preferably, the infrared heating lamp is connected to a power adjustment member for adjusting power.

[0032] More preferably, the power regulating component is a regulating power supply.

[0033] Preferably, the sweating heat transfer simulation device also includes a box.

[0034] Further preferably, the heated porous test piece, the infrared heating lamp, the position adjustment component and the fixed base are all arranged in a box.

[0035] A sweating heat transfer simulation method, using the above device, comprises the following steps:

[0036] The porous test piece is fixed on a fixed base, the position of the infrared heating lamp is adjusted by a position adjustment component, coolant is injected into the porous test piece through a liquid supply inlet of the fixed base, and a measuring component is installed through a measuring port to measure changes in relevant parameters during heating.

[0037] Preferably, the sweating heat transfer simulation method specifically includes the following steps: fixing the porous test piece on a fixed base, adjusting the position of the infrared heating lamp by a position adjustment component, and adjusting the power of the infrared heating lamp to thereby adjust the heat flow on the surface of the porous test piece, injecting coolant into the porous test piece through a liquid supply inlet of the fixed base, and at the same time installing a pressure sensor through a measuring port to measure the change in pressure during heating, and recording the surface temperature of the porous test piece by an infrared imaging camera.

[0038] In the present invention, the pressure sensor can measure the pressure of the cavity connected to the liquid supply inlet, and when the external atmospheric pressure is known, the pressure difference on both sides of the porous test piece can be measured.

[0039] In the present invention, the infrared heating lamp focuses on heating the central area of ​​the porous test piece. The coolant is delivered to the center of the porous test piece through the liquid supply inlet of the fixed base. Under the action of the surface heat flow, the central area will evaporate violently. After a period of time, a stable temperature field and pressure field will be formed on the surface. Infrared imaging can be used to observe the temperature distribution on the surface of the porous test piece, and the temperature change process before stabilization can also be observed. Through the measuring port of the fixed base, the pressure is introduced into the external pressure sensor through a pipeline, so that the internal and external pressure difference is measured by the externally arranged pressure sensor, so as to obtain the temperature field and pressure difference of the porous test piece under different heat flows and porous structures.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. The present invention can adjust the experimental variables more flexibly, reduce the experimental cost, and better conduct quantitative research on heat dissipation efficiency;

[0042] 2. The device of the present invention has a simple structure, is flexible to use, and has a low cost, and can simulate sweating heat transfer conditions in a relatively safe and convenient manner;

[0043] 3. The present invention uses optical design to focus heating, and cooperates with an external regulating power supply to adjust the heat flow more accurately and flexibly than the previous methods;

[0044] 4. The present invention can adjust the power of the infrared illuminator, focus the size of the irradiation surface, the physical parameters of different porous test pieces and the size of the heating surface according to requirements, and observe the thermal hydraulic laws of sweating heat transfer under different heat flow conditions;

[0045] 5. The present invention provides a simulated porous heating test bench, which can be used to simulate the sweating heat transfer process of the high-temperature surface of a porous part, and obtain the change process of the surface heat dissipation under different hydraulic conditions, different porous patterns and different heat flux densities;

[0046] 6. The present invention can accurately control the heat flow, observe the influence of the heat flow on the temperature field, and can also more accurately control the shape of the heating zone, which is convenient for quantitative research on the relationship between the temperature field, pressure change and heat flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the sweating heat transfer simulation device of the present invention;

[0048] Figure 2 The detailed structure and assembly diagram of the porous test piece and the fixed base of the present invention;

[0049] Figure 3 A three-dimensional diagram of the sweating heat transfer simulation device of the present invention;

[0050] Figure 4 It is a schematic diagram of the sweating heat transfer simulation device of the present invention;

[0051] In the figure: 1-porous test piece, 2-infrared heating lamp, 3-position adjustment component, 31-angle adjustment member, 311-first angle adjustment plate, 3111-first plate body, 3112-second plate body, 312-second angle adjustment plate, 3121-third plate body, 3122-fourth plate body, 3123-support plate, 32-height adjustment member, 4-fixed base, 5-box, 6-infrared imaging camera, 7-data acquisition system, 8-pressure sensor, 9-micro pump, 10-flow meter, 11-adjustable power supply. DETAILED DESCRIPTION

[0052] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0053] Example 1

[0054] A sweating heat transfer simulation device comprises: an infrared heating lamp 2, a position adjustment component 3 and a fixed base 4.

[0055] Among them, the porous experimental piece 1 is set on a fixed base 4, the infrared heating lamp 2 is connected to the position adjustment component 3, and the irradiation angle and irradiation distance of the porous experimental piece 1 can be adjusted through the position adjustment component 3. The fixed base 4 is provided with a liquid supply inlet and a pressure measurement port, which can transport coolant to the porous experimental piece 1 and measure the pressure change during heating.

[0056] Example 2

[0057] A sweating heat transfer simulation device, the position adjustment component 3 includes an angle adjustment member 31 and a height adjustment member 32, the infrared heating lamp 2 is detachably mounted on the angle adjustment member 31, the angle adjustment member 31 is mounted on the height adjustment member 32, and the height adjustment member 32 is mounted on the box 5.

[0058] Furthermore, in this embodiment, the porous test piece 1, the infrared heating lamp 2, the position adjustment assembly 3 and the fixed base 4 are all arranged in a box 5. An infrared imaging camera 6 is also arranged in the box 5 to measure the surface temperature of the porous test piece 1 during heating. The rest is the same as in Embodiment 1.

[0059] Example 3

[0060] A sweating heat transfer simulation test bench, such as Figure 1 As shown, it includes an infrared heating lamp 2, an angle adjustment member 31, a height adjustment member 32 and a fixed base 4.

[0061] Specifically:

[0062] The infrared heating lamp 2 is detachably mounted on the angle adjusting member 31, and the angle adjusting member 31 is mounted on the height adjusting member 32. The infrared heating lamp 2 can control the irradiation angle and irradiation distance through the angle adjusting member 31 and the height adjusting member 32.

[0063] The fixed base 4 can be used to install and fix the porous plate, and at the same time provide a liquid supply inlet and a measurement port.

[0064] The porous test piece 1 is fixed on a fixed base 4 and heated by an infrared heating lamp 2 to simulate the sweating heat transfer process of the porous surface.

[0065] Example 4

[0066] A sweating heat transfer simulation test bench. In this embodiment, the infrared heating lamp 2 is installed on the angle adjustment member 31, which can realize angle adjustment with two degrees of freedom, and the adjustment angle can reach 180°. The distance between the infrared heating lamp 2 and the heating surface can be adjusted by the height adjustment member 32, and the adjustment distance is about 130mm, and the size of the focusing surface can be adjusted. The porous heating element can be fixed on the fixed base 4, and the multiple openings at the bottom can provide a coolant inlet and an interface for measuring pressure. The porous experimental piece 1 can be replaced with a porous experimental piece with different pore structures according to experimental needs, thereby reducing the experimental cost. The rest is the same as Example 3.

[0067] Example 5

[0068] A sweating heat transfer simulation fixed base comprises an infrared heating lamp 2, an angle adjustment member 31, a height adjustment member 32 and a fixed base 4.

[0069] The infrared heating lamp 2 is detachably mounted on the angle adjusting member 31 and can be fixed by bolts.

[0070] The angle adjustment member 31 is mounted on the height adjustment member 32 and can achieve angle adjustment in two directions.

[0071] The height adjustment member 32 can move up and down to adjust the focal plane size of the infrared heating lamp 2 .

[0072] like Figure 2 As shown, the fixed base 4 is designed with a liquid supply port, a measuring port and screw holes for fixing, and the porous test piece 1 required for the experiment can be installed.

[0073] In this embodiment, the infrared heating lamp 2 is mounted on the angle adjustment member 31, and the distance from the irradiation surface and the irradiation angle can be controlled by the height adjustment member 32 and the angle adjustment member 31. The height adjustment member 32 has an adjustment range of 130 mm in vertical height. The angle adjustment member 31 can provide an angle adjustment of 180° in both directions.

[0074] The fixing base 4 provides 8 M3 screw holes, which can be used to fix the porous test piece 1 that needs to be heated.

[0075] The fixed base 4 provides a coolant inlet and a measuring interface, which can measure the change of internal pressure during heating.

[0076] Example 6

[0077] A sweating heat transfer simulation experimental table comprises an infrared heating lamp 2, a position adjustment component 3, a fixed base 4, a box 5 and an infrared imaging camera 6.

[0078] The infrared heating lamp 2 adopts the IRS2100 infrared focusing lamp of the Ramp Company, and the position adjustment component 3 includes an angle adjustment member 31 and a height adjustment member 32, wherein, Figure 3 As shown, the angle adjustment member 31 includes a first angle adjustment plate 311 and a second angle adjustment plate 312 .

[0079] Specifically, the first angle adjustment plate 311 includes a first plate body 3111 and a second plate body 3112, the second angle adjustment plate 312 includes a third plate body 3121, a fourth plate body 3122 and a support plate 3123, and the height adjustment member 31 includes a vertically arranged slide groove and a slide plate slidably arranged on the slide groove. The first plate body 3111 and the slide plate are provided with 180-degree arc grooves corresponding to each other, and the second plate body 3112 and the third plate body 3121 are provided with 180-degree arc grooves corresponding to each other. The first plate body 3111 is slidably connected to the slide plate through the arc groove, the second plate body 3112 is vertically connected to the first plate body 3111, and is slidably connected to the third plate body 3121 through the arc groove, the third plate body 3121 is vertically connected to the fourth plate body 3122, the fourth plate body 3122 is vertically connected to the support plate 3123, and the support plate 3123 is detachably connected to the infrared heating lamp 2.

[0080] In this embodiment, the first plate 3111 can provide an angle adjustment of 180° in one direction, and the third plate can provide an angle adjustment of 180° in another direction. The slide plate of the height adjustment member 32 can move vertically up and down 130 mm to adjust the focal plane size of the infrared heating lamp 2.

[0081] The upper surface of the fixed base 4 is mounted with a fixed porous test piece 1, and the main body is provided with a liquid supply inlet and a pressure measurement port.

[0082] Specifically, Figure 4 As shown, the pressure measurement interface is connected to the pressure sensor 8, the liquid supply inlet is connected to the coolant delivery pipeline, the coolant delivery pipeline is provided with a micro pump 9 and a flow meter 10, the infrared imaging camera 6 is connected to the data acquisition system 7, and the infrared heating lamp 2 is connected to the regulating power supply 11.

[0083] Example 7

[0084] A sweating heat transfer simulation test bench comprises an infrared heating lamp 2, an angle adjustment member 31, a height adjustment member 32, a fixed base 4, a porous test piece 1 and an infrared imaging camera 6; the infrared heating lamp 2 is detachably mounted on the angle adjustment member 31, and the infrared heating lamp 2 and the angle adjustment member 31 are mounted as a whole on the height adjustment member 32; the porous test piece 1 is mounted on the fixed base 4; a coolant inlet and outlet, as well as a corresponding measurement interface, can be provided inside the fixed base 4.

[0085] Specifically, the infrared heating lamp 2 is detachably mounted on the angle adjustment member 31, and the infrared heating lamp 2 and the angle adjustment member 31 are mounted on the height adjustment member 32 as a whole. Through the angle adjustment member 31 and the height adjustment member 32, the infrared heating lamp 2 can adjust the distance from the porous test piece 1. The infrared light inside the infrared heating lamp 2 is focused using a conical reflection surface, so that the size and shape of the focusing surface can be adjusted. The angle adjustment member 31 has an adjustment range of two angles of 180°. On the one hand, it can change the shape of the focusing surface to make it elliptical or circular, and on the other hand, it can make the light irradiate vertically. The height adjustment member 32 can move up and down 100mm, which can adjust the irradiation distance of the infrared heating lamp 2, adjust the biaxial length of the focusing surface, and also adjust part of the heat flux density. The infrared heating lamp 2 itself can be set with an independent power supply externally to adjust the irradiation power density to achieve the required heating heat flux density.

[0086] The porous test piece 1 can be fixed on the fixed base 4 by screws. There are 8 M3 screw holes on the fixed base 4, which can conveniently fix the porous test piece 1 on the upper part. The fixed base 4 has corresponding coolant inlet and outlet and measurement interface inside. The fixed base 4 has three interfaces. The upper interface has a diameter of 5mm and can provide a coolant outlet. There are two threaded ports on the side that can be connected to the pipeline. On the one hand, it provides a coolant inlet, and on the other hand, it provides a pressure measurement interface. The porous test piece 1 can replace the porous structure of the central heating area according to the experimental needs.

[0087] More specifically, the purpose of this embodiment is to provide a sweating heat transfer simulation test bench, which is a multifunctional test bench that can adapt to various experimental conditions. The test bench can test the following:

[0088] 1. Observe the surface temperature field of porous test pieces under different working conditions through infrared imaging;

[0089] 2. Surface heat dissipation under different porous structures;

[0090] 3. Surface evaporation and internal pressure changes under different external temperature fields.

[0091] The experimental steps are as follows:

[0092] 1. After fixing the porous test piece 1 and adjusting the angle and distance between the infrared heating lamp 2 and the porous test piece 1, the designed flow rate is introduced into the porous test piece 1 to wet the surface of the porous test piece 1;

[0093] 2. Turn on the infrared heating lamp 2 to heat and enter the non-steady state process. At this time, the infrared imaging camera 6 starts to record the surface temperature of the porous test piece 1, and the external pressure sensor 8 records the pressure change of the internal cavity;

[0094] 3. After a period of time, the sweating heat transfer process will tend to be stable, and the infrared imaging camera 6 can record the steady-state and unsteady-state temperature fields, and also obtain the steady-state and unsteady-state pressures.

[0095] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0096] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A sweating heat transfer simulation device, characterized in that: include: An infrared heating lamp (2) for heating the porous test piece (1); A position adjustment component (3) for adjusting the position of the infrared heating lamp (2); A fixing base (4) for mounting and fixing the porous test piece (1); The fixed base (4) is provided with a liquid supply inlet and a measuring port.

2. The sweating heat transfer simulation device according to claim 1, characterized in that: The position adjustment component (3) comprises an angle adjustment member (31) and a height adjustment member (32); The infrared heating lamp (2) is mounted on an angle adjustment member (31), and the angle adjustment member (31) is mounted on a height adjustment member (32).

3. The sweating heat transfer simulation device according to claim 2, characterized in that: The angle adjustment member (31) comprises two 180-degree angle adjustment plates.

4. The sweating heat transfer simulation device according to claim 1, characterized in that: The porous test piece (1) is fixed on the upper surface of a fixed base (4), and the infrared heating lamp (2) is located above the porous test piece (1); The fixed base (4) is provided with a liquid supply inlet and a measuring port on its main body.

5. The sweating heat transfer simulation device according to claim 4, characterized in that: The porous test piece (1) is detachably mounted on the upper surface of the fixed base (4) by means of a plurality of bolts arranged in a circumferential direction; The liquid supply inlet includes a cooling liquid inlet, and the measuring port includes a pressure interface.

6. The sweating heat transfer simulation device according to claim 1, characterized in that: It also includes an infrared imaging camera (6) for recording the surface temperature of the porous test piece (1).

7. The sweating heat transfer simulation device according to claim 1, characterized in that: The infrared light inside the infrared heating lamp (2) is focused by means of a conical reflection surface and is connected to a power adjustment member for adjusting the power.

8. The sweating heat transfer simulation device according to claim 1, characterized in that: The sweating heat transfer simulation device also includes a box (5); The heated porous test piece (1), the infrared heating lamp (2), the position adjustment component (3) and the fixed base (4) are all arranged in a box (5).

9. A sweating heat transfer simulation method, characterized in that: The method is carried out using the device according to any one of claims 1 to 8, comprising the following steps: The porous test piece (1) is fixed on a fixed base (4), the position of the infrared heating lamp (2) is adjusted by a position adjustment component (3), a coolant is injected into the porous test piece (1) through a liquid supply inlet of the fixed base (4), and a measuring component is installed through a measuring port to measure changes in relevant parameters during heating.

10. The sweating heat transfer simulation method according to claim 9, characterized in that: The specific steps include: The porous test piece (1) is fixed on a fixed base (4), the position of the infrared heating lamp (2) is adjusted by a position adjustment component (3), and the heat flow on the surface of the porous test piece (1) is adjusted by adjusting the power of the infrared heating lamp (2), and a coolant is injected into the porous test piece (1) through a liquid supply inlet of the fixed base (4), and a pressure sensor is installed through a measuring port to measure the pressure change during heating, and the surface temperature of the porous test piece (1) is recorded by an infrared imaging camera.

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