Anti-floating heat accumulator for heat accumulating type air heater

Abstract

The invention discloses a heat accumulator anti-floating structure for a heat accumulating type air heater, which comprises a throat and a heat accumulating assembly arranged in the throat, the heat accumulating assembly is composed of a top cover and at least two layers of honeycomb-shaped porous bricks, and at least one anti-floating structure with the same size and thickness as the honeycomb-shaped porous bricks is arranged in the heat accumulating assembly; the cross section of the anti-floating structure is in a regular hexagon shape, round grooves are formed in the upper face and the lower face of the anti-floating structure, and airflow through holes are evenly distributed in the round grooves. According to the heat storage body anti-floating structure for the heat storage type air heater, through the design of the anti-floating structure, airflow distribution of the heat storage assembly can be uniform, and heat storage body floating caused by the too high airflow flowing speed is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of heat storage bodies, and in particular to an anti-floating heat storage body for a heat storage type air heater. Background Art

[0002] Hypersonic wind tunnels are important experimental devices used to study the aerodynamic characteristics of aircraft under hypersonic conditions. One of its key core systems is the thermal storage air heater, which is used to simulate the high temperature environment encountered by aircraft during hypersonic flight. The thermal storage air heater stores and releases heat through the thermal storage body to provide a stable high-temperature airflow. However, under actual working conditions, when the heater valve is opened, there will be an instantaneous pressure relief inside, causing high-speed airflow to form inside the heater. This high-speed airflow will produce buoyancy on the thermal storage body, causing it to float inside the heater, and then collide with other components, causing damage to the thermal storage body. The floating of the thermal storage body not only affects the normal operation of the heater, but may also lead to inaccurate experimental results and even damage the wind tunnel equipment.

[0003] In the prior art, physical fixing methods are usually used to prevent the heat storage body from floating, such as fixing the heat storage body in the heater by a bracket, a fixing frame, etc. However, these methods have the following disadvantages:

[0004] 1. Ineffective in dealing with high-speed airflow: Physical fixing methods are not very effective in dealing with high-speed airflow. The buoyancy generated when airflow passes through the thermal storage body may still cause the thermal storage body to move, causing it to collide with other components.

[0005] 2. Limit the thermal expansion of the thermal storage body: The thermal storage body will undergo thermal expansion and contraction during the heating and cooling process. Physical fixation methods may limit its free expansion, leading to stress concentration and material fatigue, and reducing the service life of the thermal storage body.

[0006] 3. Difficulty in maintenance and replacement: The bracket and fixing frame for fixing the heat storage body increase the complexity and difficulty of operation when maintaining and replacing the heat storage body, affecting the efficiency of the experimental equipment. Summary of the invention

[0007] In view of the defects in the prior art, the purpose of the present invention is to provide an anti-floating thermal storage body for a thermal storage air heater. By optimizing the thermal storage body structure, the air flow velocity can be effectively reduced at the moment of valve opening of the hypersonic wind tunnel thermal storage air heater, the buoyancy can be reduced, and the thermal storage body can be prevented from floating and being damaged, thereby improving the operating stability and safety of the equipment.

[0008] To achieve the above object, the technical solution of the present invention is as follows:

[0009] A floating prevention heat storage body for a thermal storage air heater comprises: a throat, and a heat storage component arranged in the throat, wherein the heat storage component is composed of a top cover and at least two layers of honeycomb porous bricks, and at least one floating prevention structure having the same size and thickness as the honeycomb porous bricks is arranged inside the heat storage component; the floating prevention structure has a regular hexagonal cross section, and circular grooves are arranged on both the upper and lower surfaces, and air flow holes are evenly distributed inside the circular grooves.

[0010] Preferably, the throat consists of a supporting part and a pipe part, the supporting part is cylindrical, and its interior is used to carry the heat storage component, and the pipe part is arranged in the center of the supporting part for connecting with the interior of the supporting part and is located on the same central axis as the anti-floating structure.

[0011] Preferably, a groove for placing the anti-floating structure is provided at the center below the top cover, and a part of the anti-floating structure is located in the groove, and another part is located in the second layer.

[0012] Preferably, when the number of the anti-floating structures is greater than or equal to two, a support member is provided between the two anti-floating structures.

[0013] Preferably, the support member is a honeycomb-shaped porous brick.

[0014] Preferably, seven parallel anti-floating structures are provided between the second layer and the top cover.

[0015] Preferably, the anti-floating structures are arranged in parallel with one in the center and the other six arranged in a surrounding manner.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The anti-floating heat storage body provided by the present invention significantly reduces the air flow velocity in a key area through the design of the anti-floating structure, thereby reducing the buoyancy effect on the heat storage body and avoiding the floating problem of the heat storage body.

[0018] The anti-floating heat storage body provided by the present invention has a stable heat storage component structure by embedding the anti-floating structure with the top cover and the first layer, and a porous brick is provided between the two anti-floating structures, thereby ensuring the stability of the heat storage body during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0020] Figure 1 It is a structural schematic diagram of a heat storage body in the prior art.

[0021] Figure 2It is a structural schematic diagram of an anti-floating heat storage body disclosed in a preferred embodiment of the present invention.

[0022] Figure 3 It is a top view of an anti-floating structure in an anti-floating thermal storage body disclosed in a preferred embodiment of the present invention.

[0023] Figure 4 It is a cross-sectional view of an anti-floating structure in an anti-floating thermal storage body disclosed in a preferred embodiment of the present invention.

[0024] Figure 5 It is a structural schematic diagram of another anti-floating heat storage body disclosed in a preferred embodiment of the present invention.

[0025] Figure 6 It is a structural schematic diagram of another anti-floating heat storage body disclosed in a preferred embodiment of the present invention;

[0026] Figure 7 It is a top view of the heat storage body in the present invention.

[0027] Figure 8 It is a physical picture of the anti-floating structure in the present invention.

[0028] Fig. 9 It is a physical picture of the anti-floating structure and the honeycomb-shaped porous bricks in the present invention.

[0029] Description of reference numerals:

[0030] 1. Throat; 2. Flow-equalizing top cover; 3. Second layer; 4. Third layer; 5. Bottom layer; 6. Anti-floating structure; 7. Support. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the prior art, the heat storage body (equivalent to the heat storage component in this application) is as follows Figure 1 As shown, it is composed of a plurality of honeycomb hollow bricks, which include a top cover 2, a second layer 3, a third layer 4 and a bottom layer 5.

[0034] An anti-floating heat storage body for a heat storage air heater, such as Figure 2 and Figure 3 As shown, it comprises: a throat 1, and a heat storage component arranged in the throat 1, the heat storage component is composed of a top cover 2 and at least two layers of honeycomb porous bricks, and at least one anti-floating structure 6 with the same size and thickness as the honeycomb porous bricks is arranged inside the heat storage component; the anti-floating structure 6 is a regular hexagonal cross section, and circular grooves are arranged on both the upper and lower surfaces, and air flow holes are evenly distributed inside the circular grooves. The size and thickness of the anti-floating structure 6 are the same as those of the honeycomb porous bricks constituting the heat storage component, and can be closely connected with the other honeycomb porous bricks to ensure the uniformity of the airflow of the heat storage component.

[0035] In some specific embodiments, Figure 3 As shown, the anti-floating structure 6 has 7 air flow holes.

[0036] In some specific embodiments, Figure 2 As shown, the throat 1 consists of a supporting part and a pipe part. The supporting part is cylindrical and its interior is used to carry the heat storage component. The pipe part is arranged in the center of the supporting part and is used to connect the interior of the supporting part. It is located on the same central axis as the anti-floating structure 6.

[0037] In some specific embodiments, Figure 2 , 4 As shown in Figure 5, a groove for placing the anti-floating structure 6 is provided at the center below the top cover 2, and a part of the anti-floating structure 6 is located in the groove, and the other part is located in the second layer 3. With such a design, the anti-floating component 6 can be embedded with the top cover 2 and the second layer 3, thereby improving the overall firmness of the heat storage body and preventing the heat storage body from vibrating and loosening due to excessive airflow.

[0038] In some specific embodiments, Figure 4 As shown, when there are more than or equal to two anti-floating structures 6, a support member 7 is provided between two upper and lower adjacent anti-floating structures 6. In some specific embodiments, the support member 7 is a honeycomb porous brick. The support member 7 is the same as the other honeycomb porous bricks constituting the thermal storage assembly, and not only plays the role of supporting the anti-floating structure 6, but also the through holes thereon can form a gap with the air flow holes on the anti-floating structure 6, thereby playing the role of reducing the air flow velocity.

[0039] In some specific embodiments, Figure 5As shown, 7 parallel anti-floating structures 6 are arranged between the second layer 3 and the top cover 2, and the parallel anti-floating structures 6 are arranged in a manner of one in the center and the other 6 in a surrounding manner. The air flow velocity is further reduced and evenly distributed, avoiding the floating problem of the heat storage component caused by excessively high air flow velocity.

[0040] Finite element numerical analysis software is used to analyze the heat storage bodies with different structures ( Figure 1 , Figure 2 , Figure 5 , Figure 6 The stress and airflow distribution of the heat storage body (shown in Figure 2) inside the heater are simulated, combined with Figure 7 The description of each point in the top view of the heat storage body shown verifies the stability of the heat storage body with special structural design under high-speed airflow. The SST k-moega model is adopted. The inlet is 45MPa pressure and 1800K gas. The outlet is 0.1MPa pressure and 300K state. The initialization setting of the fluid area is 45MPa and 1800K gas. During the test process of 0.5s after opening the fast valve, in the time of 0.1s, due to the huge pressure difference before and after, a large flow rate will be generated, so the flow rate change in the time period of 0.1s is mainly explored. Since it involves high-pressure and high-speed flow states, in order to ensure the precision and accuracy of the calculation, the time step is set to 1e-5 and the number of time steps is set to 10000. The results are shown in Table 1.

[0041] Table 1 Simulation results analysis of current sharing scheme

[0042]

[0043] It can be seen from Table 1 that the three current balancing methods in the present invention can significantly achieve the effect of current balancing. Figure 6 The middle method (changing two layers of middle bricks + changing one layer of second brick) can achieve the best flow equalization effect, and the average flow rate is close, which can keep the gas flow of the top brick of alumina basically at 1-1.6 (m 3 / s) to reduce the risk of thermal storage body floating.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. An anti-floating heat storage body for a heat storage air heater, characterized in that: include: A throat, and a heat storage component arranged in the throat, the heat storage component is composed of a top cover and at least two layers of honeycomb porous bricks, at least one anti-floating structure with the same size and thickness as the honeycomb porous bricks is arranged inside the heat storage component; the anti-floating structure has a regular hexagonal cross section, and circular grooves are arranged on both the upper and lower surfaces, and air flow holes are evenly distributed inside the circular grooves.

2. The anti-floating heat storage body for a thermal storage air heater according to claim 1, characterized in that: The throat is composed of a supporting part and a pipe part. The supporting part is cylindrical and its interior is used to carry the heat storage component. The pipe part is arranged in the center of the supporting part and is used to connect to the interior of the supporting part. It is located on the same central axis as the anti-floating structure.

3. The anti-floating heat storage body for a thermal storage air heater according to claim 1 or 2, characterized in that: A groove for placing the anti-floating structure is provided at the center below the top cover, and a part of the anti-floating structure is located in the groove, and the other part is located in the second layer.

4. The anti-floating heat storage body for a thermal storage air heater according to claim 3, characterized in that: When the number of the anti-floating structures is greater than or equal to two, a support member is provided between the two anti-floating structures.

5. The anti-floating heat storage body for a thermal storage air heater according to claim 4, characterized in that: The supporting member is a honeycomb-shaped porous brick.

6. The anti-floating heat storage body for a thermal storage air heater according to claim 4, characterized in that: Seven parallel anti-floating structures are arranged between the second layer and the top cover.

7. The anti-floating heat storage body for a thermal storage air heater according to claim 6, characterized in that: The anti-floating structures are arranged in parallel in a manner of one in the center and the other six in a surrounding arrangement.

8. A thermal storage air heater, comprising the anti-floating thermal storage body for a thermal storage air heater according to any one of claims 1 to 7.

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