Evaporative cooling panel for reducing local heat transfer deterioration effects

Abstract

The application discloses a sweating cooling panel capable of reducing local heat transfer deterioration effect, which comprises a porous layer, a working medium layer, a solid layer and a working medium inlet structure; the porous layer, the working medium layer, the solid layer and the working medium inlet structure are sequentially arranged from the air flow field to the inside, wherein the porous layer is a porous structure, cooling working medium flows from the working medium layer to the porous layer under the action of a driving pressure and is further injected into the air flow field; the working medium layer is a cavity structure and is used for temporarily storing the cooling working medium; the cooling working medium in the working medium layer is injected from the working medium inlet structure; the solid layer is a solid structure and mainly plays a force bearing role and prevents the cooling working medium from entering the cabin of an aircraft; and the working medium inlet structure is located at the middle part of the panel or the front part in the air flow direction. The application can greatly reduce the local heat transfer deterioration effect of the panel, the cabin section skin and the like, greatly improve the reliability of the sweating cooling panel and the skin in operation, and thus high-efficiency cooling is realized.

Description

Technical Field

[0001] This invention belongs to the field of thermal protection technology, specifically relating to a sweating cooling plate that reduces the effect of local heat transfer degradation. Background Technology

[0002] High-speed aircraft cabins, with their large-area structures, experience high temperatures due to intense gas friction and even stagnant heating. As load-bearing structures, they must maintain high mechanical properties at service temperatures, making their design challenging. Traditionally, two approaches have been used: "heat-resistant materials + cold structure" or "hot structure + high-efficiency insulation layer." The former occupies a large space within the aircraft, while the latter has high production costs and long production cycles, both of which negatively impact the high-performance design of the aircraft.

[0003] Active sweating cooling technology can be adapted to various pneumatic heating environments. At the same time, because it operates at a low temperature, the mechanical properties of the metal cooling structure can be maintained at a high level, making it a very promising technology.

[0004] However, both theory and experiments have shown that during operation, inconsistent heat flow or localized high temperatures caused by heat conduction in the sweating cooling plate can lead to vaporization of the liquid cooling medium within the structure. This vaporization significantly increases flow resistance, further restricting the transport of the cooling medium and creating a vicious cycle. Ultimately, this results in structural damage such as ablation and deformation. This phenomenon is known as "localized heat transfer deterioration." Figure 1 As shown. Therefore, a sweating cooling plate structure is proposed to reduce the effect of local heat transfer degradation, which can effectively reduce this effect and significantly improve the reliability of the sweating cooling plate. Summary of the Invention

[0005] This invention proposes a sweating cooling plate and a sweating cooling plate structure based on it to reduce the effect of local heat transfer degradation. Through this invention, the effect of local heat transfer degradation in plates, compartment skins, etc., can be significantly reduced, and the reliability of the sweating cooling plate and skin operation can be greatly improved, thereby achieving efficient cooling.

[0006] Working Principle: A sweating cooling plate that reduces the effect of localized heat transfer deterioration includes a porous layer, a working fluid layer, a solid layer, and a working fluid inlet structure. From the airflow field inwards, the layers are arranged in sequence: porous layer, working fluid layer, solid layer, and working fluid inlet structure. The porous layer is a porous structure; the cooling fluid flows from the working fluid layer to the porous layer under driving pressure and is further injected into the airflow field. The working fluid layer is a cavity structure used for temporary storage of the cooling fluid, which is injected into the working fluid inlet structure. The solid layer is a solid structure, mainly serving a load-bearing function and preventing the cooling fluid from entering the aircraft cabin. The working fluid inlet structure is located in the middle of the plate or at the front of the airflow direction.

[0007] Furthermore, N solid reinforcement columns are arranged within the working fluid layer. The number and diameter of the solid reinforcement columns are determined based on simulation of the working pressure of the working fluid. These columns are used to enhance the connection strength between the porous layer and the solid layer, ensuring its reliable operation under the working fluid pressure.

[0008] Furthermore, the working fluid inlet structure is directly connected to the main working fluid channel of the solid layer, the upstream working fluid channel is located at the front of the flat plate and is connected to the main working fluid channel, and the branch working fluid channel is located at both ends of the plate and is connected to the upstream working fluid channel.

[0009] Furthermore, the cooling medium is directly transported to the upstream part of the high-speed flowing air through the main working medium channel, and the high heat flux area of ​​the plate is preferentially cooled through the upstream working medium channel. Then, the cooling medium in the upstream working medium channel is transported to other high heat flux parts or high temperature structural connection parts through the branch working medium channel.

[0010] Furthermore, during the transport process, M vents are set in the middle of the branch channel to transport the cooling working fluid to a large area with relatively uniform heat flow and small heat flow value, thereby ensuring the cooling of the large area in the middle.

[0011] Furthermore, after the cooling working medium flows in from the working medium inlet structure, it is transported through the main working medium flow channel to the middle position of the upstream working medium flow channel. In the upstream working medium flow channel, it splits into two and flows in two directions. The branch working medium flow channel is connected to the main working medium flow channel. The cooling working medium is then transported from the upstream working medium flow channel to the branch working medium flow channel. A drain port is provided in the branch working medium flow channel, and the cooling working medium is transported to a large area through the drain port.

[0012] Furthermore, when the high heat flow zones on both sides of the sweating cooling plate are not obvious, the branch working fluid flow channel is cancelled, and the drain outlet is set in the upstream flow channel of the working fluid.

[0013] The beneficial effects of this invention are:

[0014] (1) The present invention proposes a sweating cooling plate structure, whose three-layer sandwich structure can take into account heat protection, load bearing and manufacturing, and has good functionality and engineering manufacturability.

[0015] (2) The present invention proposes a sweating cooling plate structure to reduce the local heat transfer deterioration effect, which can significantly reduce the local heat transfer deterioration effect of plate, compartment skin, etc., improve product reliability, and achieve efficient cooling.

[0016] (3) The sweating cooling plate structure proposed in this invention can reduce the surface temperature of the aircraft and has a significant effect. This structure has the potential to be extended to large-area cabin structures and has good engineering effects. Attached Figure Description

[0017] Figure 1 Schematic diagram of localized heat transfer deterioration;

[0018] Figure 2 Schematic diagram of the sweating cooling plate of this invention;

[0019] Figure 3 Exploded view of the sweat-inducing cooling plate structure;

[0020] Figure 4 Schematic diagram of working fluid flow in the working fluid channel;

[0021] Figure 5 This is a schematic diagram showing the flow direction of the working fluid in the working fluid channel.

[0022] Figure 6 Schematic diagram of the working fluid flow channel structure (hidden porous layer);

[0023] Figure 7 Schematic diagram of working fluid flow in the working fluid channel;

[0024] Figure 8 Schematic diagram of the connection between the sweating cooling plate and the adjacent structures on both sides;

[0025] The structure includes: 1. Porous layer; 2. Working fluid layer; 3. Solid layer; 4. Working fluid inlet structure; 5. Solid reinforcement column; 6. Sensor mounting hole; 7. Main working fluid channel groove; 8. Upstream working fluid channel groove; 9. Branch working fluid channel groove; and 10. Drainage port. Detailed Implementation

[0026] Besides the embodiments described below, the present invention may also have other embodiments or be implemented in different ways. Therefore, it should be understood that the present invention is not limited to the detailed structure of the components described in the following specification or shown in the accompanying drawings. When only one embodiment is described herein, the claims are not limited to that embodiment.

[0027] A sweating cooling plate for reducing localized heat transfer degradation includes a porous layer 1, a working fluid layer 2, a solid layer 3, and a working fluid inlet structure 4. The layers are arranged sequentially from the airflow field inwards: porous layer 1, working fluid layer 2, solid layer 3, and working fluid inlet structure 4. The porous layer 1 is a porous structure; the cooling fluid flows from the working fluid layer 2 to the porous layer 1 under driving pressure and is further injected into the airflow field. The working fluid layer 2 is a cavity structure, formed by the porous layer 1 and the solid layer 3, used for temporary storage of the cooling fluid. The cooling fluid in the working fluid layer 2 is injected through the working fluid inlet structure. The solid layer 3 is a solid structure, mainly serving a load-bearing function and preventing the cooling fluid from entering the aircraft cabin; the working fluid flow channel is also designed on the solid structure. The working fluid inlet structure is located in the middle of one side of the solid layer of the sweating cooling plate or at the front of the airflow direction. Figure 2 As shown.

[0028] N solid reinforcing columns 5 are arranged within the working fluid layer. The number and diameter of the solid reinforcing columns 5 are determined based on simulation of the working pressure of the working fluid. They are used to enhance the connection strength between the porous layer 1 and the solid layer 3, ensuring reliable operation under the working fluid pressure. During the experiment, some of the solid reinforcing columns 5 can be replaced with sensor mounting holes 6 according to the test requirements. The sensor mounting holes 6 generally extend into a portion of the porous layer. If the sensor hole is a through hole, then the sensor hole extends into the surface of the porous layer. Figure 3 As shown.

[0029] To reduce the local heat transfer degradation effect, the cooling working fluid should be prioritized to the upstream of high-speed flow and the connection parts of high heat flux or high temperature structures to avoid the liquid cooling working fluid being heated too quickly locally to generate gas and cause heat transfer degradation effect. The working fluid inlet structure 4 and the main working fluid flow channel 7 of the solid layer 3 are directly connected. The upstream working fluid flow channel 8 is located at the front of the flat plate and is connected to the main working fluid flow channel 7. The branch working fluid flow channel 9 is located at both ends of the flat plate and is connected to the upstream working fluid flow channel 8.

[0030] The cooling medium is directly transported to the upstream part of the high-speed flowing air through the main working medium channel 7, and preferentially cools the high heat flux area of ​​the flat plate through the upstream working medium channel 8. Then, the cooling medium in the upstream working medium channel 8 is transported to other high heat flux parts or high temperature structural connection parts through the branch working medium channel 9. During the transportation process, M vents 10 are set in the middle of the branch channel, and the cooling medium is transported to a large area with relatively uniform heat flux and small heat flux value through the vents 10, so as to ensure the cooling of the large area in the middle.

[0031] like Figure 4 This is a schematic diagram of the working fluid flow channel structure; Figure 5 The working medium flows in the working medium channel. After flowing in from the working medium inlet structure 4, the cooling working medium is transported through the main working medium channel 7 to the middle position of the upstream working medium channel 8. In the upstream working medium channel 8, it splits into two and flows in two directions. The branch working medium channel 9 is connected to the main working medium channel 7. The cooling working medium is then transported from the upstream working medium channel 8 to the branch working medium channel 9. A drain port 10 is provided in the branch working medium channel 9. The cooling working medium is transported to a large area through the drain port 10.

[0032] Example 2

[0033] Another simplified sweat-cooling plate structure to reduce thermal blockage effect, such as Figure 6 , Figure 7 , Figure 8 As shown, the high heat flux regions on both sides of the sweating cooling plate are not obvious, and the temperature difference between the sweating plate and the structures adjacent to it on both sides is not significant. Figure 5The sweating cooling plate structure reduces the number of branch working fluid channels 9, while the drain port 10 is located in the upstream working fluid channel 8.

[0034] like Figure 6 Schematic diagram of the working fluid flow channel structure of the sweating cooling plate structure shown. Figure 7 To simplify the flow direction of the working fluid in the working fluid channel of the sweating cooling plate structure.

[0035] Various modifications can be made to the method proposed in this invention without departing from the scope of the invention. Therefore, the scope of protection of this invention should be determined by the appended claims.

Claims

1. A sweating cooling plate for reducing local heat transfer degradation, comprising a porous layer, a working fluid layer, a solid layer, and a working fluid inlet structure; characterized in that, From the airflow field inwards, the structure consists of a porous layer, a working fluid layer, a solid layer, and a working fluid inlet structure. The porous layer is a porous structure from which the cooling working fluid flows under driving pressure and is further injected into the airflow field. The working fluid layer is a cavity structure used for temporary storage of the cooling working fluid, which is injected into the working fluid inlet structure. The solid layer is a solid structure that mainly serves to bear loads and prevent the cooling working fluid from entering the aircraft cabin. The working fluid inlet structure is located in the middle of the flat plate or at the front of the airflow direction. N solid reinforcement columns are arranged within the working fluid layer. The number and diameter of the solid reinforcement columns are determined based on the simulation of the working pressure of the working fluid. They are used to enhance the connection strength between the porous layer and the solid layer, ensuring its reliable operation under the working fluid pressure. Some of the solid reinforcement columns can be replaced with sensor mounting holes according to test requirements. The working fluid inlet structure is directly connected to the main working fluid channel of the solid layer. The upstream working fluid channel is located at the front of the plate and is connected to the main working fluid channel. The branch working fluid channel is located at both ends of the plate and is connected to the upstream working fluid channel. The cooling medium is transported directly to the upstream part of the high-speed flowing air through the main working medium channel. The upstream working medium channel prioritizes cooling the high heat flux area of ​​the flat plate. Then, the cooling medium in the upstream working medium channel is transported to other high heat flux areas or high temperature structural connection parts through the branch working medium channel channels.

2. The sweating cooling plate as described in claim 1, characterized in that, During the transport process, M vents are set in the middle of the branch channel to transport the cooling working fluid to a large area with relatively uniform heat flow and small heat flow value, so as to ensure the cooling of the large area in the middle.

3. The sweating cooling plate as described in claim 2, characterized in that, The cooling medium flows in from the working medium inlet structure and is transported through the main working medium channel to the middle position of the upstream working medium channel. In the upstream working medium channel, it splits into two and flows in two directions. The branch working medium channel is connected to the main working medium channel. The cooling medium is then transported from the upstream working medium channel to the branch working medium channel. A drain outlet is provided in the branch working medium channel, and the cooling medium is transported to a large area through the drain outlet.

4. The sweating cooling plate as described in claim 2, characterized in that, When the high heat flow zone on both sides of the sweating cooling plate is not obvious, the branch working fluid flow channel is cancelled, and the drain outlet is set in the upstream flow channel of the working fluid.

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