Tuna gill filament biomimetic structure micro-channel pre-cooler

Abstract

The present application belongs to the field of air inlet channel of jet propulsion device, and particularly relates to a tuna gill filament bionic structure micro-channel pre-cooler, which comprises a rectangular flow channel and a vortex generating structure; the rectangular flow channel is formed by two oppositely arranged heat exchange plates and two oppositely arranged support plates, the vortex generating structure is arranged at the inlet side of the rectangular flow channel, the vortex generating structure is a triangular column body, and comprises a first side edge, a second side edge and a third side edge; the first side edge is arranged in close contact with the support plate, the second side edge is close to the inlet side, and the included angle between the second side edge and the support plate is greater than or equal to 90 DEG; the third side edge is close to the outlet side, and the included angle between the third side edge and the support plate is greater than 90 DEG; the pre-cooler can effectively increase the heat exchange coefficient of the pre-cooler, meanwhile, the air resistance coefficient is not excessively increased, and the purpose of improving the comprehensive heat exchange coefficient is achieved. The pre-cooler has the advantages of compact structure, high heat exchange efficiency, low cost and high structural strength.

Description

Technical Field

[0001] This invention belongs to the field of air intake ducts for jet propulsion devices, specifically relating to a microchannel precooler with a biomimetic structure of tuna gill filaments. Background Technology

[0002] With the development of aerospace technology, pre-cooled combined cycle engines are being used more and more widely in hypersonic vehicles. Precoolers can rapidly cool the high-temperature air captured in the air intake, and the cooled air can effectively improve the operating efficiency of the engine compressor, thereby increasing the engine's thrust and specific impulse. However, precoolers still face significant challenges in enhancing heat transfer and improving compactness.

[0003] Chinese invention patent CN201811598700.X - Microchannel and Precooler proposes a precooler using microchannels to overcome the shortcomings of existing technologies, such as the heat exchange capacity of microchannels being limited by the inability to improve the tube wall processing technology. Under the premise that the maturity of existing processing technology allows, with a certain tube wall thickness, it can achieve a larger temperature drop, a larger heat transfer coefficient, and the smallest possible flow loss.

[0004] However, this type of microchannel structure is difficult to manufacture and has limited airflow efficiency, making it unsuitable for cooling large volumes of high-speed, high-pressure air. While conventional plate-type air precoolers offer advantages such as compact structure and ease of manufacturing, their overly simple structure results in low heat exchange efficiency, failing to meet the requirements for high-efficiency heat transfer in precoolers. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a microchannel precooler with a biomimetic structure of tuna gill filaments that is simple and reliable in structure and has high heat exchange efficiency.

[0006] This invention provides a microchannel precooler with a biomimetic structure of tuna gill filaments, comprising a rectangular flow channel and a vortex generating structure;

[0007] The rectangular flow channel is formed by two heat exchange plates and two support plates arranged opposite each other, with the inlet and outlet at each end of the rectangular flow channel, respectively.

[0008] The vortex generating structure is located on one side of the inlet of the rectangular flow channel. The vortex generating structure is a triangular prism, including a first end face and a second end face that are arranged opposite to each other, as well as a first side face, a second side face, and a third side face that are rectangular.

[0009] The first side is fitted to the support plate, the second side is close to the inlet side and the angle between the second side and the support plate is greater than or equal to 90°; the third side is close to the outlet side and the angle between the third side and the support plate is greater than 90°.

[0010] Furthermore, the angle between the second and third sides is rounded.

[0011] Furthermore, the vortex generating structure is arranged in two sets mirror images along the symmetry plane of the two support plates, and the included angle between the second side and the third side of the two sets of vortex generating structures has a first interval.

[0012] Furthermore, each group of vortex generating structures has at least two, and there is a second interval between every two adjacent vortex generating structures, the second interval being connected to the first interval.

[0013] Furthermore, each group of vortex generating structures is provided with one, the first end face of the vortex generating structure is attached to one of the heat exchange plates, and the second end face of the vortex generating structure is attached to the other heat exchange plate.

[0014] Furthermore, the support plate is made of a thermally conductive material.

[0015] Furthermore, the heat exchange plate is provided with cooling channels parallel to the rectangular flow channels.

[0016] Furthermore, the coolant flow direction in the cooling channel is opposite to the gas flow direction in the rectangular channel.

[0017] Furthermore, the rectangular flow channels and vortex generating structures are arranged in multiple sets in a rectangular array.

[0018] Furthermore, the heat exchange plate in each row of the rectangular flow channels is a single unit, and the support plate in each column of the rectangular flow channels is a single unit.

[0019] The beneficial effects of this invention are that the tuna gill filament biomimetic microchannel precooler provided by this invention has a vortex generating structure with a triangular prism structure and arranged in the manner described above. After hot air enters the rectangular flow channel, it first encounters the vortex generating structure at the front end. The hot air first impacts the second side and begins to generate vortices downstream of the rectangular flow channel at the angle between the second side and the first side. The vortex has longitudinal vortices and transverse vortices. The longitudinal vortex can both agitate the hot air, causing the hot air away from the heat exchange plate to flow towards the heat exchange plate, improving the uniformity of hot air cooling and promoting heat exchange between the heat exchange plate and the hot air, and can also rotate at high speed to destroy the thermal boundary layer on the heat exchange plate, further promoting heat exchange. The transverse vortex is located on the leeward side of the vortex generating structure and can agitate the hot air to a certain extent, promoting heat exchange between the heat exchange plate and the hot air.

[0020] The generated eddies will transform into turbulence, disturbing the hot air flow field and promoting convective heat transfer between the hot air and the heat exchange plate in all directions, further improving the uniformity of hot air heat transfer.

[0021] In addition, the angle between the third side and the support plate is greater than 90°. The solid part of the third side fills the gap on the leeward side of the vortex generating structure, which greatly reduces the size of the negative pressure zone on the leeward side of the vortex generating structure, reduces the flow resistance of the vortex generating structure to hot air, and improves the transmission efficiency and stability of hot air.

[0022] In addition, this vortex generating structure has a larger contact area with the conventional protrusion and rectangular flow channel, resulting in higher structural strength and the ability to withstand the impact of high-speed, high-pressure air.

[0023] This precooler effectively increases the heat transfer coefficient without excessively increasing the air resistance coefficient, thus achieving the goal of improving the overall heat transfer coefficient. Furthermore, this precooler boasts advantages such as compact structure, high heat transfer efficiency, low cost, and high structural strength. Attached Figure Description

[0024] Appendix Figure 1 A schematic diagram of the structure when four vortex generating structures are set in each rectangular flow channel in this invention (the hollow arrows in the figure indicate the direction of hot air flow);

[0025] Appendix Figure 2 A front view of the present invention when four vortex generating structures are set in each rectangular flow channel;

[0026] Appendix Figure 3 for Figure 1 A partial structural diagram;

[0027] Appendix Figure 4 This is a schematic diagram of the eddy current generating structure in this invention;

[0028] Appendix Figure 5 This is a schematic diagram of the flow of coolant and hot air in this invention (the hollow arrow in the diagram indicates the direction of hot air flow, and the thin solid arrow indicates the direction of coolant flow).

[0029] Appendix Figure 6 Front view of the present invention when two vortex generating structures are set for each rectangular flow channel;

[0030] Appendix Figure 7 A top view of a rectangular flow channel without a vortex generating mechanism in the prior art;

[0031] Appendix Figure 8 A top view of the airflow field in existing technologies where no vortex generating mechanism is installed;

[0032] Appendix Figure 9 A schematic diagram of the airflow field in existing technologies that do not include a vortex generating mechanism;

[0033] Appendix Figure 10 A top view of a rectangular flow channel with a rectangular vortex generator mechanism in the prior art;

[0034] Appendix Figure 11 A top view of the airflow field in an existing technology with a rectangular vortex generator mechanism;

[0035] Appendix Figure 12 A schematic diagram of the airflow field in the prior art with a rectangular vortex generator mechanism;

[0036] Appendix Figure 13 for Figure 12 Schematic diagram of the airflow field at section A;

[0037] Appendix Figure 14 A top view of the present invention when each rectangular flow channel is provided with 2 or 4 vortex generating structures;

[0038] Appendix Figure 15 Top view of the airflow field when two vortex generating structures are set in each rectangular flow channel of the present invention;

[0039] Appendix Figure 16 A schematic diagram of the airflow field when two vortex generating structures are set in each rectangular flow channel of the present invention;

[0040] Appendix Figure 17 for Figure 16 Schematic diagram of the airflow field at section B;

[0041] Appendix Figure 18 Top view of the airflow field when four vortex generating structures are set in each rectangular flow channel of the present invention;

[0042] Appendix Figure 19 A schematic diagram of the airflow field when four vortex generating structures are set in each rectangular flow channel of the present invention;

[0043] Appendix Figure 20 for Figure 16 A schematic diagram of the airflow field at section C.

[0044] In the diagram, 1-rectangular airflow channel; 11-inlet; 12-outlet; 13-first partition; 14-second partition; 16-negative pressure zone; 2-vortex generating structure; 21-first side; 22-second side; 23-third side; 24-first end face; 25-second end face; 26-arc; 3-heat exchange plate; 31-cooling channel; 4-support plate; 5-rectangular vortex generating structure; 6-longitudinal vortex; 7-transverse vortex. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0047] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0050] As attached Figure 1-6 As shown, the present invention provides a microchannel precooler with a biomimetic structure of tuna gill filaments, which is disposed on the air intake of a jet propulsion device and is used to cool the air flowing into the jet propulsion device. It includes a rectangular flow channel 1 and a vortex generating structure 2.

[0051] The rectangular flow channel 1 is formed by two heat exchange plates 3 and two support plates 4 arranged opposite to each other. The heat exchange plates 3 and the support plates 4 are perpendicular to each other. The two ends of the rectangular flow channel 1 are the inlet 11 and the outlet 12, respectively. Hot air flows into the rectangular flow channel 1 from the inlet 11 and flows out from the outlet 12. When the hot air is inside the rectangular flow channel 1, it exchanges heat with the heat exchange plates 3 and thus cools down.

[0052] The vortex generating structure 2 is disposed on one side of the inlet 11 of the rectangular flow channel 1. The vortex generating structure 2 is a triangular prism, including a first end face 24 and a second end face 25 disposed opposite to each other, and a first side face 21, a second side face 22 and a third side face 23 that are rectangular. The first end face 24 and the second end face 25 are the bottom and top surfaces of the triangular prism, and the first end face 24 and the second end face 25 are triangular. Preferably, the first end face 24 and the second end face 25 are parallel to each other.

[0053] The first side 21 is fitted to the support plate 4, the second side 22 is close to the inlet 11, and the angle between the second side 22 and the support plate 4 is greater than or equal to 90°, that is, the second side 22 is perpendicular to the support plate 4 or inclined toward the outlet 12; the third side 23 is close to the outlet 12, and the angle between the third side 23 and the support plate 4 is greater than 90°, that is, the third side 23 is inclined toward the inlet 11.

[0054] The tuna gill filament biomimetic microchannel precooler provided by this invention has a vortex generating structure 2 with a triangular prism structure and arranged in the manner described above. After hot air enters the rectangular flow channel 1, it first encounters the vortex generating structure 2 at the front end. The hot air first impacts the second side 22, and at the angle between the second side 22 and the first side 21, it begins to generate a vortex downstream of the rectangular flow channel 1. The vortex has a longitudinal vortex 6 and a transverse vortex 7. The longitudinal vortex 6 can both agitate the hot air, causing the hot air away from the heat exchange plate 3 to flow towards the heat exchange plate 3, improving the uniformity of the hot air cooling and promoting the heat exchange between the heat exchange plate 3 and the hot air, and can also rotate at high speed to destroy the thermal boundary layer on the heat exchange plate 3, further promoting heat exchange. The transverse vortex 7 is located on the leeward side of the vortex generating structure 2, and can agitate the hot air to a certain extent, promoting the heat exchange between the heat exchange plate 3 and the hot air.

[0055] The generated eddies will transform into turbulence, disturbing the hot air flow field and promoting convective heat transfer between the hot air and the heat exchange plate 3 in all directions, further improving the uniformity of hot air heat transfer.

[0056] In addition, the angle between the third side 23 and the support plate 4 is greater than 90°. The solid part of the third side 23 fills the gap on the leeward side of the vortex generating structure 2, which greatly reduces the size of the negative pressure zone 16 on the leeward side of the vortex generating structure 2, reduces the flow resistance of the vortex generating structure 2 to hot air, and improves the transmission efficiency and stability of hot air.

[0057] In addition, the vortex generating structure 2 has a larger contact area with the conventional protrusion and rectangular flow channel 1 compared to the conventional structure, and has higher structural strength, enabling it to withstand the impact of high-speed, high-pressure air.

[0058] This precooler effectively increases the heat transfer coefficient without excessively increasing the air resistance coefficient, thus achieving the goal of improving the overall heat transfer coefficient. Furthermore, this precooler boasts advantages such as compact structure, high heat transfer efficiency, low cost, and high structural strength.

[0059] In one embodiment, the angle between the second side 22 and the third side 23 is transitioned by an arc 26. In this embodiment, one end of the vortex generating structure 2 is transitioned by an arc 26, which is smoother than the conventional protrusion with sharp edges, thereby further reducing the flow resistance of the vortex generating structure 2.

[0060] In one embodiment, two sets of vortex generating structures 2 are mirror images of each other along the symmetry plane of the two support plates 4. The included angle between the second side 22 and the third side 23 of the two sets of vortex generating structures 2 has a first interval 13. Hot air enters the rectangular flow channel 1 downstream of the vortex generating structure 2 through the first interval 13. Setting two sets of vortex generating structures 2 can increase the size of the generated vortices and turbulence, so that the heat exchange effect of the hot air entering the rectangular flow channel 1 is consistent. The mirror image arrangement of the two sets of vortex generating structures 2 can improve the flow stability and uniformity of the hot air.

[0061] refer to Figures 1-3 In one embodiment, each group of vortex generating structures 2 is provided with at least two, and there is a second interval 14 between each two adjacent vortex generating structures 2. The second interval 14 is connected to the first interval 13. Taking the example of each group of vortex generating structures 2 being provided with two, the first end face 24 of one vortex generating structure 2 is attached to one heat exchange plate 3, and the second end face 25 of the other vortex generating structure 2 is attached to another heat exchange plate 3. The second interval 14 is formed on the opposite side of the two vortex generating structures 2.

[0062] In this embodiment, a vortex generating structure 2 is provided at each of the four corners of the rectangular flow channel 1. The first interval 13 and the second interval 14 form a cross-shaped flow channel. In this embodiment, due to the presence of the second interval 14, the incoming hot air can also enter the downstream negative pressure zone 16 through the second interval 14, further reducing the area of ​​the negative pressure zone 16 on the leeward side of the vortex generating structure 2, thereby further reducing the flow resistance and improving the hot air delivery efficiency. More importantly, due to the presence of the second interval 14, a longitudinal vortex 6 with a large vortex volume and an orderly vortex structure can be formed downstream of the vortex generating structure 2, which greatly improves the heat exchange efficiency between the hot air and the heat exchange plate 3, increases the breaking strength of the thermal boundary layer, and further improves the cooling effect of the hot air. That is, by setting the second interval 14, both the flow resistance and the heat exchange efficiency can be reduced.

[0063] refer to Figure 6 In one embodiment, each group of vortex generating structures 2 is provided with one. The first end face 24 of the vortex generating structure 2 is attached to one of the heat exchange plates 3, and the second end face 25 of the vortex generating structure 2 is attached to another heat exchange plate 3. In this embodiment, there is only a first interval 13, which has a larger flow resistance and lower heat exchange efficiency compared to the embodiment with a second interval 14. However, the vortex generating structure 2 connects two heat exchange plates 3 and a support plate 4 at the same time, which greatly increases the contact area between the vortex generating structure 2 and the rectangular flow channel 1, and has higher structural strength, which can withstand the impact of high-speed and high-pressure air.

[0064] In one embodiment, the support plate 4 is made of a thermally conductive material, that is, the support plate 4 can act as a heat dissipation fin to transfer heat to the heat exchange plate 3 for heat exchange, thereby improving the cooling effect of hot air.

[0065] In one embodiment, the heat exchange plate 3 is provided with a cooling channel 31 parallel to the rectangular flow channel 1. The cooling channel 31 is used to circulate coolant and to continuously exchange heat with the hot air that continuously flows into the rectangular flow channel 1, so as to ensure the heat exchange effect. Moreover, by providing the cooling channel 31 on the heat exchange plate 3, the structural size of the precooler will not be increased, and the air flow in the rectangular flow channel 1 will not be affected.

[0066] refer to Figure 5 In one embodiment, the coolant in the cooling channel 31 flows in the opposite direction to the airflow in the rectangular channel 1, forming a counter-flow arrangement, which can increase the average temperature difference, reduce the small heat exchange area and improve the compactness.

[0067] refer to Figures 1-3In one embodiment, multiple sets of rectangular flow channels 1 and vortex generating structures 2 are arranged in a rectangular array to increase the delivery volume of hot air. In this embodiment, it is preferable that the heat exchange plates 3 in each row of the rectangular flow channels 1 are integrated, and the support plates 4 in each column of the rectangular flow channels 1 are integrated, simplifying the structure and reducing installation difficulty. In this embodiment, the support plates 4 can not only divide the rectangular flow channels 1, but also improve heat exchange efficiency and enhance structural strength. In addition, multiple sets of rectangular flow channels 1 arranged in a rectangular array can rectify the flow of hot air entering from the inlet 11 during the cooling process, so that it flows out from the outlet 12 in a relatively orderly manner.

[0068] The operation process of the precooler in this embodiment is as follows:

[0069] 1. High-temperature, high-speed hot air flows into multiple independent rectangular channels 1, which are composed of heat exchange plates 3 and support plates 4, through inlet 11;

[0070] 2. After hot air enters the rectangular flow channel 1, it first encounters the vortex generating structure 2 at the front end, and forms a longitudinal vortex 6 downstream of the vortex generating structure 2. The longitudinal vortex 6 can not only disturb the air flow field, but also destroy the boundary layer of the air near the heat exchange plate 3 to promote the cooling of the hot air.

[0071] 3. The disturbed hot air exchanges heat with the coolant through the heat exchange plate 3. Since the coolant and hot air are arranged in countercurrent, there is a large temperature difference between the two fluids, which can further promote the heat exchange between the fluids.

[0072] 4. When the air flows in the rectangular flow channel 1, it undergoes sufficient heat exchange, and the temperature drops significantly. Finally, the cooled air flows out from the outlet 12 of the rectangular flow channel 1.

[0073] refer to Figures 7-20 Through experimental comparison and analysis, this invention achieves an improvement in the overall heat transfer coefficient without significantly increasing the air resistance coefficient. The specific analysis is as follows:

[0074] refer to Figures 7-9 , Figures 7-9 To avoid incorporating any vortex-generating structures, the rectangular flow channel 1 is shown in a schematic diagram with a smooth wall. As can be seen from the diagram, the smooth surface prevents the straight-line airflow within the channel from being disturbed, and the air remains in a laminar state at low Reynolds numbers. A relatively thick thermal boundary layer exists on the heat exchange plate 3, and the hot air in the middle is difficult to exchange heat. Although this method has the lowest flow resistance and the simplest structure, the heat exchange effect is not ideal and cannot meet the engine's air cooling requirements.

[0075] refer to Figures 10-13 , Figures 7-9 To illustrate the state 5 of the rectangular vortex generating structure in the prior art, based on Figure 11 and Figure 12It is known that when hot air passes through the turbulence structure of the rectangular vortex generator 5, it will be agitated. The hot air, which was originally in a laminar state, will be transformed into turbulent flow after passing through the turbulence protrusion, which can promote the convective heat transfer of the air. However, a large negative pressure zone 16 is formed on the leeward side behind the rectangular vortex generator 5, which leads to an increase in air flow resistance and affects the overall heat transfer performance. According to Figure 13 It can be seen that the rectangular vortex generating structure 5 has two obvious longitudinal vortices 6 on the downstream longitudinal section. The rectangular vortex generating structure 5 can not only improve the heat transfer efficiency by transforming laminar flow into turbulent flow, but also generate longitudinal vortices 6 to break the thermal boundary layer and improve the heat transfer efficiency. However, the strength of the longitudinal vortex 6 is generally small, and its improvement on the heat transfer effect is also limited.

[0076] refer to Figures 14-17 , Figures 17-19 A schematic diagram showing the state where the vortex generating structure 2 of the present invention is set up, and two vortex generating structures 2 are set up in one rectangular flow channel 1, according to... Figure 15 and Figure 16 It can be seen that when hot air passes through the turbulence structure of vortex generating structure 2, it will also be agitated and transformed into turbulence. However, the arc 26 of vortex generating structure 2 is smoother and has lower flow resistance than that of rectangular vortex generating structure 5. The third side 23 of vortex generating structure 2 fills a large amount of gaps on the leeward side, thereby reducing the negative pressure zone 16 and further reducing flow resistance. At the same time, compared with rectangular vortex generating structure 5, vortex generating structure 2 has a larger contact area with rectangular flow channel 1, has higher structural strength, and can withstand the impact of high-speed, high-pressure air. According to Figure 17 It can be seen that although the vortex generating structure 2 effectively reduces the flow resistance, it also reduces the energy of the longitudinal vortex 6. Compared with the rectangular vortex generating structure 5, the longitudinal vortex 6 of the vortex generating structure 2 in this embodiment is smaller, so the improvement in heat exchange effect is limited.

[0077] refer to Figure 14 , Figures 18-20 ,refer to Figure 14 , Figures 18-20 A schematic diagram showing the vortex generating structure 2 of the present invention, with four vortex generating structures 2 (with a second interval 14) arranged within a rectangular flow channel 1, according to... Figures 18-19 It can be seen that by adding the second interval 14, the flow resistance can be further reduced on the basis of the former. Since the existence of the second interval 14, the negative pressure zone 16 on the leeward side is basically eliminated. Figure 18 It can be seen that downstream of the vortex generating structure 2, there is no longer a large area of ​​negative pressure zone 16 forming a transverse vortex 7. At the same time, the incoming hot air passes through the second interval 14 through the vortex generating structure 2, further reducing the influence of the leeward side on the flow resistance. According to Figure 20 It can be seen that setting the second interval 14 can not only further reduce the flow resistance, but also generate a large amount of longitudinal vortex 6 downstream of the vortex generating structure 2. Moreover, the longitudinal vortex 6 is neat and orderly, which improves the heat exchange efficiency while reducing the flow resistance.

[0078] In this embodiment, the vortex generating structure 2 with a triangular prism structure agitates the hot air, thereby generating vortices in the hot air within the rectangular flow channel 1 to enhance heat transfer. The triangular prism shape effectively reduces the negative pressure zone 16 on the leeward side of the vortex generating structure 2. At the same time, the rounded arc 26 on one corner of the triangular prism provides a transition, and the arrangement forms a second interval 14, which effectively reduces the resistance coefficient of the precooler and further improves the overall heat exchange performance of the precooler.

[0079] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A microchannel precooler with a biomimetic structure of tuna gill filaments, characterized in that, It includes a rectangular flow channel (1) and a vortex generating structure (2); The rectangular flow channel (1) is formed by two heat exchange plates (3) arranged opposite to each other and two support plates (4) arranged opposite to each other. The two ends of the rectangular flow channel (1) are the inlet (11) and the outlet (12). The vortex generating structure (2) is located on one side of the inlet (11) of the rectangular flow channel (1). The vortex generating structure (2) is a triangular prism, including a first end face (24) and a second end face (25) arranged opposite to each other, as well as a first side (21), a second side (22) and a third side (23) that are rectangular. The first side (21) is fitted to the support plate (4), the second side (22) is close to the inlet (11) and has a gap from the inlet (11), and the angle between the second side (22) and the support plate (4) is greater than or equal to 90°; the third side (23) is close to the outlet (12) and the angle between the third side (23) and the support plate (4) is greater than 90°; The vortex generating structure (2) is arranged in two sets along the symmetry plane of the two support plates (4), and the included angle between the second side (22) and the third side (23) of the two sets of vortex generating structures (2) has a first interval (13). Each set of vortex generating structures (2) has at least two, and there is a second interval (14) between each two adjacent vortex generating structures (2), and the second interval (14) is connected to the first interval (13).

2. The tuna gill filament biomimetic microchannel precooler as described in claim 1, characterized in that, The angle between the second side (22) and the third side (23) is transitioned by an arc (26).

3. The tuna gill filament biomimetic microchannel precooler as described in claim 1, characterized in that, The support plate (4) is made of a thermally conductive material.

4. The tuna gill filament biomimetic microchannel precooler as described in any one of claims 1-3, characterized in that, The heat exchange plate (3) is provided with a cooling channel (31) parallel to the rectangular channel (1).

5. The tuna gill filament biomimetic microchannel precooler as described in claim 4, characterized in that, The coolant in the cooling channel (31) flows in the opposite direction to the gas in the rectangular channel (1).

6. The tuna gill filament biomimetic microchannel precooler as described in any one of claims 1-3, characterized in that, The rectangular flow channel (1) and the vortex generating structure (2) are arranged in a rectangular array in multiple groups.

7. The tuna gill filament biomimetic microchannel precooler as described in claim 6, characterized in that, The heat exchange plate (3) in each row of the rectangular flow channel (1) is a single unit, and the support plate (4) in each column of the rectangular flow channel (1) is a single unit.

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