Heat exchanger core and application thereof

Abstract

The invention belongs to the technical field of aviation equipment, and particularly relates to a heat exchanger core and application thereof. The invention provides a heat exchanger core which comprises a plurality of longitudinally-arranged square tubes, a plurality of heat exchange tubes and a plurality of heat exchange tubes, the sections of the square tubes are rectangular, and the square tubes are hollow square tubes and used for cooling fluid to pass through; a plurality of fins are arranged on the surfaces of two adjacent side faces of each square tube, and the side faces, without the fins, of every two adjacent square tubes are attached to each other. The invention further provides application of the heat exchanger core body in aero-engines, variable cycle engines and hypersonic velocity turbine base combined power. According to the technical scheme, the cooling fluid in the square tube and the fins can conduct heat exchange synchronously, the cooling effect on high-temperature gas passing through the heat exchanger core body is effectively guaranteed, and meanwhile the heat exchanger core body is small in structure, light in weight and capable of being widely applied to various aviation flight devices; the technical defect that in the prior art, a heat exchanger is poor in high-temperature stamping air inlet cooling effect is overcome.

Description

Technical Field

[0001] The present application belongs to the field of aviation equipment technology, and in particular relates to a heat exchanger core and its application. Background Art

[0002] Aviation turbine engines are the mainstream aviation engine solution, with the characteristics of horizontal take-off and landing, reusability and high specific impulse. The aerodynamic heating effect usually limits the flight limit of modern advanced aviation turbine engines to Ma2.5. In order to further increase the flight speed of the turbine, one of the main solutions is to use a heat exchanger structure to cool the ram air intake, reduce the temperature of the turbine inlet airflow, offset the increase in intake temperature caused by the aerodynamic heating effect during high-speed flight, and enable the turbine to fly at a higher speed.

[0003] In the prior art, capillary heat exchangers or plate-fin heat exchangers are usually used to reduce the air temperature of the turbine inlet airflow. However, due to the small cross-sectional area of ​​the capillary heat exchanger, the flow rate of the cooling fluid flowing through the heat exchanger is also small, so the cooling effect of the capillary heat exchanger is relatively poor; the plate-fin heat exchanger has low fin efficiency, which affects the cooling effect.

[0004] Therefore, developing a heat exchanger core and its application to solve the technical defect of the prior art that the heat exchanger has a poor cooling effect on the high-temperature ram air intake has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] Based on this, it is necessary to provide a heat exchanger core and its application to address the technical defects of the existing technology that the heat exchanger has poor cooling effect on the high-temperature ram air intake.

[0006] The present application provides a heat exchanger core, the heat exchanger core comprising: a plurality of longitudinally arranged square tubes, the cross-section of the square tubes being rectangular, the square tubes being hollow square tubes, and used for cooling fluid to pass through;

[0007] A plurality of fins are arranged on the surfaces of two adjacent side surfaces of the square tube, and the side surfaces of two adjacent square tubes without fins are in contact with each other.

[0008] In one embodiment, the fins are grouped in pairs, the bottom ends of each group of fins are in contact with the outer surface of the square tube, and the top ends of the fins are in contact with the top ends of the fins in the same group; the bottom ends of two adjacent groups of fins are in contact with each other.

[0009] In one of the embodiments, the heat exchanger core further includes: a guide bar, wherein the guide bar is arranged in the gap between adjacent square tubes.

[0010] In one embodiment, the side length of the cross section of the square tube is 1 to 10 mm;

[0011] and / or,

[0012] The wall thickness of the square tube is less than 0.1 mm.

[0013] In one embodiment, the material of the square tube is selected from any one or more of aluminum alloy, stainless steel, high temperature alloy and silicon carbide.

[0014] In one embodiment, the cooling fluid is selected from any one or more of water, kerosene, ethylene glycol, sodium potassium alloy, gallium indium tin alloy, lead bismuth alloy and mercury.

[0015] In one embodiment, the thickness of the fin is 0.1-0.5 mm.

[0016] In one embodiment, the material of the fin is selected from any one or more of aluminum alloy, stainless steel, titanium alloy and high-temperature alloy.

[0017] In one embodiment, the material of the guide strip is selected from any one or more of aluminum alloy, stainless steel, titanium alloy and high-temperature alloy.

[0018] The present application also provides an application of a heat exchanger core including any one of the above items in an aircraft engine, a variable cycle engine, and a hypersonic turbine-based combined power.

[0019] In summary, the present application provides a heat exchanger core, which includes: a plurality of longitudinally arranged square tubes, the cross-section of the square tubes is rectangular, and the square tubes are hollow square tubes for cooling fluid to pass through; a plurality of fins are arranged on the surface of two adjacent sides of the square tubes, and the sides of two adjacent square tubes without fins are in contact with each other. The present application also provides an application of the above-mentioned heat exchanger core in aircraft engines, variable cycle engines and hypersonic turbine-based combined power. In the technical solution provided by the present application, the cooling fluid and the fins inside the square tubes can exchange heat synchronously, effectively ensuring the cooling effect of the high-temperature gas passing through the heat exchanger core. At the same time, the heat exchanger core has a compact structure and light weight, and can be widely used in various types of aviation flight equipment. The heat exchanger core and its application provided by the present application solve the technical defect in the prior art that the heat exchanger has a poor cooling effect on the high-temperature ram air intake. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a heat exchanger core in the technical solution provided in the embodiment of the present application;

[0022] Figure 2 A schematic diagram of the assembly structure of square tubes and fins in a heat exchanger core provided in an embodiment of the present application;

[0023] Figure 3 In the technical solution provided in the embodiment of the present application, a schematic diagram of the gas flow direction of the external airflow through the heat exchanger core;

[0024] Figure 4 A schematic diagram of the assembly structure of square tubes, fins and guide strips in a heat exchanger core provided in an embodiment of the present application;

[0025] Figure 5 A partially enlarged schematic diagram of the assembly structure of square tubes, fins and guide strips in a heat exchanger core provided in an embodiment of the present application;

[0026] Figure 6 A partially enlarged schematic diagram of the gas flow direction of an external airflow through a heat exchanger core in a heat exchanger core provided in an embodiment of the present application;

[0027] Among them, there are square tubes 1, fins 2 and guide strips 3. DETAILED DESCRIPTION

[0028] The embodiments of the present application provide a heat exchanger core and application thereof, which are used to solve the technical defect in the prior art that the heat exchanger has a poor cooling effect on high-temperature ram air intake.

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application 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 application. However, the present application 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 application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[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 present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] See also Figure 1 and Figure 2 The embodiment of the present application provides a heat exchanger core, comprising: a plurality of square tubes 1 arranged longitudinally, the cross section of the square tube 1 is rectangular, the square tube 1 is a hollow square tube 1, and is used for cooling fluid to pass through; a plurality of fins 2 are arranged on the surface of two adjacent sides of the square tube 1, and the sides of two adjacent square tubes 1 without fins 2 are in contact with each other. The embodiment of the present application provides a heat exchanger core and its application, which is used to solve the technical defect of the prior art that the heat exchanger has a poor cooling effect on high-temperature ram air intake.

[0036] In the technical solution provided in the embodiment of the present application, a heat exchanger core configuration with both a plate-fin heat exchange structure and a tube-fin heat exchange structure is provided. The cooling fluid inside the square tube 1 and the fins 2 on the surface of the square tube 1 can simultaneously exchange heat and cool the high-temperature gas passing through the heat exchanger core, and has a high heat exchange capacity, which significantly increases the effective heat exchange area. Therefore, under the premise of similar heat exchange effects, the overall design dimensions of the heat exchanger core, such as weight and volume, are reduced.

[0037] To further optimize the technical solution, while ensuring that the fins 2 will not affect the gas flow speed and direction through the heat exchanger core, at the same time, the cooling effect of the fins 2 on the gas is increased as effectively as possible, that is, taking into account both minimizing the impact on the gas flow and optimizing the gas heat exchange effect. In a heat exchanger core provided in an embodiment of the present application, the fins 2 are grouped in pairs, and the bottom ends of each group of fins 2 are in contact with the outer surface of the square tube 1, and the top ends of the fins 2 are in contact with the top ends of the fins 2 in the same group; the bottom ends of two adjacent groups of fins 2 are abutted. Each group of fins 2 forms a hollow triangular structure with the outer surface of the square tube 1, and the airflow can effectively exchange heat through the inside of the triangle, fully contact the square tube 1 and the fins 2, and achieve a good cooling effect; at the same time, the gaps inside the hollow triangular structure and between adjacent triangular structures allow the airflow to pass smoothly, and will not cause obvious obstruction or impact on the airflow through the heat exchanger core; and the bottom ends of two adjacent groups of fins 2 are abutted, which can make full use of the space on the surface of the square tube 1, arrange as many fins 2 as possible, increase the heat exchange area, and maximize the heat exchange effect entering the heat exchanger core.

[0038] Please go further here Figures 3 to 6 In the working process of the heat exchanger core, in order to maximize the heat exchange efficiency per unit time, the air flow can enter the heat exchanger core from two directions through an external air intake structure, such as Figure 3 and Figure 6 As shown, when airflow enters the heat exchanger core from two directions respectively, in order to prevent the airflows in the two directions from intersecting and colliding, a heat exchanger core provided in an embodiment of the present application further includes: a guide bar 3, and the guide bar 3 is arranged in the gap between adjacent square tubes 1.

[0039] To further optimize the technical solution, while ensuring that the cooling fluid in the square tube 1 can flow smoothly through the inner wall of the square tube 1 to ensure a good heat exchange effect on the airflow flowing through the heat exchanger core, the square tube 1 has a stable structure, is not prone to damage, and is easy to prepare and assemble. In the technical solution provided in the embodiment of the present application, the cross-sectional side length of the square tube 1 is 1 to 10 mm; and / or the wall thickness of the square tube 1 is less than 0.1 mm.

[0040] Similarly, it is ensured that the cooling fluid inside the square tube 1 can quickly exchange heat with the airflow outside the square tube 1. At the same time, the square tube 1 itself can also perform auxiliary heat exchange. In the technical solution provided in the embodiment of the present application, the material of the square tube 1 is selected from: any one or more of aluminum alloy, stainless steel, high-temperature alloy and silicon carbide.

[0041] In the technical solution provided in the embodiment of the present application, according to the actual cooling demand and taking into account the counterweight design, the cooling fluid can have a larger specific heat capacity and better fluidity. In a heat exchanger core provided in the embodiment of the present application, the cooling fluid is selected from any one or more of: water, kerosene, ethylene glycol, sodium-potassium alloy, gallium-indium-tin alloy, lead-bismuth alloy and mercury.

[0042] In a heat exchanger core provided in an embodiment of the present application, in order to achieve a good cooling effect of the fins 2 on the gas and minimize the flow impact on the gas flowing through the fins 2, the thickness of the fins 2 is 0.1 to 0.5 mm.

[0043] Similarly, on the basis of ensuring a good cooling effect of the fin 2, the design concept of the structural stability of the fin 2 and the lightweight of the fin 2 are taken into account. In the technical solution provided in the embodiment of the present application, the material of the fin 2 is selected from: any one or more of aluminum alloy, stainless steel, titanium alloy and high-temperature alloy.

[0044] In a heat exchanger core provided in the present application, the guide strip 3 not only ensures that the two air flows do not intersect and collide, but also plays an auxiliary cooling role for the air flow, and also takes into account the design concept of lightweight and structural stability. The material of the guide strip 3 is selected from: any one or more of aluminum alloy, stainless steel, titanium alloy and high-temperature alloy.

[0045] In the actual installation and application process, in order to further enhance the stability of the overall structure of the heat exchanger core and prevent the external airflow from flowing through the heat exchanger core at a high speed, causing the various structures of the heat exchanger core to scatter or shift, during the assembly process of the square tube 1, the fin 2 and the guide strip 3, the three can be welded and fixed together by using welding processes such as brazing.

[0046] A heat exchanger core provided in an embodiment of the present application has the advantages of light weight, small size and good heat exchange effect, and can be widely used in various fields such as aircraft engines, variable cycle engines and hypersonic turbine-based combined power.

[0047] In summary, the present application provides a heat exchanger core, which includes: a plurality of longitudinally arranged square tubes, the cross-section of the square tubes is rectangular, and the square tubes are hollow square tubes for cooling fluid to pass through; a plurality of fins are arranged on the surface of two adjacent sides of the square tubes, and the sides of two adjacent square tubes without fins are in contact with each other. The present application also provides an application of the above-mentioned heat exchanger core in aircraft engines, variable cycle engines and hypersonic turbine-based combined power. In the technical solution provided by the present application, the cooling fluid and the fins inside the square tubes can exchange heat synchronously, effectively ensuring the cooling effect of the high-temperature gas passing through the heat exchanger core. At the same time, the heat exchanger core has a compact structure and light weight, and can be widely used in various types of aviation flight equipment. The heat exchanger core and its application provided by the present application are used to solve the technical defect in the prior art that the heat exchanger has a poor cooling effect on the high-temperature ramjet intake.

[0048] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are 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. At the same time, other implementation methods can be derived from the above-mentioned embodiments, so that structural and logical replacements and changes can be made without departing from the scope of this disclosure.

[0049] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A heat exchanger core, characterized in that: The heat exchanger core comprises: a plurality of longitudinally arranged square tubes, the cross-section of the square tubes being rectangular, and the square tubes being hollow square tubes for cooling fluid to pass through; A plurality of fins are arranged on the surfaces of two adjacent side surfaces of the square tube, and the side surfaces of two adjacent square tubes without fins are in contact with each other.

2. The heat exchanger core according to claim 1, characterized in that: The fins are grouped in pairs, the bottom ends of each group of fins are fitted with the outer surface of the square tube, and the top ends of the fins are fitted with the top ends of the fins in the same group; the bottom ends of two adjacent groups of fins are abutted.

3. The heat exchanger core according to claim 1 or 2, characterized in that: The heat exchanger core further comprises: a guide bar, wherein the guide bar is arranged in the gap between adjacent square tubes.

4. The heat exchanger core according to any one of claims 1 to 3, characterized in that: The cross-sectional side length of the square tube is 1 to 10 mm; and / or, The wall thickness of the square tube is less than 0.1 mm.

5. The heat exchanger core according to any one of claims 1 to 3, characterized in that: The material of the square tube is selected from any one or more of aluminum alloy, stainless steel, high temperature alloy and silicon carbide.

6. The heat exchanger core according to any one of claims 1 to 3, characterized in that: The cooling fluid is selected from any one or more of water, kerosene, ethylene glycol, sodium potassium alloy, gallium indium tin alloy, lead bismuth alloy and mercury.

7. The heat exchanger core according to any one of claims 1 to 3, characterized in that: The thickness of the fin is 0.1-0.5 mm.

8. The heat exchanger core according to any one of claims 1 to 3 or 7, characterized in that: The material of the fin is selected from any one or more of aluminum alloy, stainless steel, titanium alloy and high-temperature alloy.

9. The heat exchanger core according to claim 3, characterized in that: The material of the guide strip is selected from any one or more of aluminum alloy, stainless steel, titanium alloy and high-temperature alloy.

10. An application of the heat exchanger core according to any one of claims 1 to 9 in aircraft engines, variable cycle engines and hypersonic turbine-based combined power.

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