A water-drop type flying-wing evaporator with inclined side walls

Abstract

The utility model relates to the technical field of flying wing type evaporator, concretely relates to a water drop type flying wing type evaporator with inclined fin base surface, including porous flat tube and multiple flying wing type fins set on it, the porous flat tube includes the windward surface and the leeward surface of opposite arrangement and two symmetrical fins base surfaces connected between both, the windward surface and the leeward surface are tangent to the fin base surface respectively, and the windward surface, the leeward surface and two fin base surfaces jointly constitute the water drop type cross section structure about the symmetry of horizontal plane, two fin base surfaces all form an inclined angle theta with horizontal plane, the flying wing type fin sets on the fin base surface, its height changes along the extension direction of fin base surface, makes each fin top portion be located at the same level height, and forms the air flow channel of equal interval, the utility model improves the comprehensive heat transfer of evaporator significantly, promotes the condensate water to discharge along the inclined base surface rapidly, improves the heat exchange uniformity.

Description

Technical Field

[0001] This utility model relates to the technical field of wing-type evaporators, specifically the design of a teardrop-shaped wing-type evaporator with an inclined fin base surface. Background Technology

[0002] As a key heat exchange component in vapor compression systems, the evaporator's heat exchange efficiency directly determines the energy efficiency and reliability of the entire refrigerator, air conditioner, or heat pump unit.

[0003] Current evaporators generally adopt the traditional tube-fin structure, which has advantages such as low manufacturing cost and mature technology. However, there is contact thermal resistance between the fins and the heat exchange tubes, which limits the further improvement of heat exchange efficiency. Under low temperature and high humidity conditions, the surface is prone to frost formation. The frost layer increases the thermal resistance and air-side pressure drop, resulting in reduced air volume and increased energy consumption. In severe cases, it may even block the fin gaps and affect the normal operation of the system.

[0004] To reduce energy consumption and improve evaporator efficiency, research has become crucial, primarily focusing on two approaches: developing novel evaporators such as microchannel evaporators and structural improvements to traditional tube-fin evaporators. While microchannel evaporators offer advantages like compact structure and high heat transfer efficiency, they are prone to problems such as poor drainage, frost buildup, and uneven refrigerant distribution in high-humidity environments. Optimization of traditional tube-fin evaporators mainly concentrates on enhancing heat transfer through vortex flow, delaying frost formation, improving airflow matching, and integrating phase change materials. For example, adding a vortex generator can improve heat transfer efficiency, but it also increases pressure drop; optimizing fin spacing can delay frost buildup and extend operating time; and using non-uniform airflow design or perforated fin structures can also improve heat exchange performance to some extent.

[0005] However, most existing technologies focus on heat transfer enhancement and defrosting control, while insufficient attention is paid to the drainage capacity of the evaporator structure and the uniform matching of internal flow. The problems of uneven refrigerant distribution and defrost water retention have not been effectively solved, which restricts the full realization of its performance. Utility Model Content

[0006] To address the aforementioned shortcomings of existing technologies, this invention provides a teardrop-shaped evaporator with inclined fin base surfaces that combines high-efficiency heat exchange, excellent drainage capacity, and uniform internal flow, thereby further improving the energy efficiency and operational reliability of refrigerators.

[0007] This utility model discloses a teardrop-shaped flying wing evaporator with inclined sidewalls, comprising a porous flat tube and multiple flying wing-shaped fins disposed thereon. The porous flat tube includes a windward side and a leeward side arranged opposite each other, and two fin base surfaces symmetrically connected between the two. The windward side and the leeward side are tangent to the fin base surfaces, and the windward side, the leeward side, and the two fin base surfaces together form a teardrop-shaped cross-sectional structure symmetrical about the horizontal plane. The windward side is an arc surface with a radius of curvature R, and the leeward side is an arc surface with a radius of curvature r, satisfying R>r. Both fin base surfaces are inclined at an angle θ to the horizontal plane.

[0008] The flying wing-shaped fins are disposed on the fin base surface, and their height varies along the extension direction of the fin base surface, so that the top of each fin is at the same horizontal height and forms an equally spaced airflow channel.

[0009] As a preferred technical solution, the tilt angle θ ranges from 3° to 7°.

[0010] As a preferred technical solution, the height variation of the flying wing-shaped fins satisfies the following relationship:

[0011] (1);

[0012] Among them, z fh (x) represents the fin height at coordinate x in the X-axis direction; the coordinate system is set as follows: the intersection of the porous flat tube cross section and the fin base surface is taken as the X-axis, the intersection of the windward side and the fin base surface is taken as the Y-axis, the intersection of the two axes is taken as the origin, and the Z-axis is taken as the direction perpendicular to the fin base surface and along the extension direction of the flying wing fin; L represents the total length of the fin base surface in the X-axis direction, that is, the projected distance between the intersection of the windward side and the fin base surface and the intersection of the leeward side and the fin base surface.

[0013] As a preferred technical solution, the height of the flying wing-shaped fins can remain constant along the X-axis, satisfying the following relationship:

[0014] (2);

[0015] Where zfh(x) represents the fin height at coordinate x in the X-axis direction; the coordinate system is set as follows: the intersection of the porous flat tube cross section and the fin base surface is taken as the X-axis, the intersection of the windward side and the fin base surface is taken as the Y-axis, the intersection of the two axes is taken as the origin, and the Z-axis is taken as the direction perpendicular to the fin base surface and along the extension direction of the flying wing fin; L represents the total length of the fin base surface in the X-axis direction, that is, the projected distance between the intersection of the windward side and the fin base surface and the intersection of the leeward side and the fin base surface.

[0016] As a preferred technical solution, the intersection of the horizontal symmetry plane and the flow section of the porous flat tube is defined as the X-axis, and the vertical upward direction is defined as the W-axis. Under this coordinate system, the vertical distance from any point on the fin base surface to the horizontal symmetry plane is determined by the following formula (3):

[0017] (3);

[0018] Where w(x) represents the vertical distance of the fin base surface relative to the horizontal plane of symmetry when the coordinate is x on the X-axis; θ represents the tilt angle between the fin base surface and the horizontal plane; and x represents the coordinate of a point on the fin base surface in the X-axis direction.

[0019] As a preferred technical solution, the porous flat tube is provided with multiple supporting baffles inside, which divide the internal space into multiple independent channels for refrigerant flow and heat exchange.

[0020] As a preferred technical solution, the cross-sectional area of ​​the multiple channels decreases sequentially from the windward side to the leeward side.

[0021] As a preferred technical solution, the flying wing fin is a wavy discontinuous fin, which is formed by scanning a wavy discontinuous curve on the base surface of the fin along a direction perpendicular to the base surface.

[0022] As a preferred technical solution, the flying wing fin is a wavy discontinuous fin, which is formed by scanning the wavy discontinuous curve on the fin base surface along the fin profile line perpendicular to the fin base surface, and the wavy discontinuous curve is composed of multiple curves.

[0023] As a preferred technical solution, the wavy discontinuous curve uses the fin base surface as the reference plane, the intersection of the windward side and the fin base surface as the y-axis, and the intersection of the flat tube cross-section and the fin base surface as the x-axis. The equation of the wavy discontinuous curve is as follows:

[0024] (4);

[0025] (5);

[0026] (6);

[0027] In the above formula, L represents the total length of the fin base surface in the x-axis direction, i.e., the projected distance between the intersection of the windward side and the fin base surface and the intersection of the leeward side and the fin base surface; RIDi is the proportion of the span of the i-th curve in the x-axis to L among the multiple curves constituting the wavy discontinuous curve, x... i Let x be the x-coordinate of the i-th curve, and y be the y-coordinate of the i-th curve. iLet y be the y-coordinate of the i-th curve, t be a parameter with a value in the range of [0,1], WA be the amplitude of the wavy discontinuous curve, WL be the wavelength of the wavy discontinuous curve, I be the discontinuity of the wavy discontinuous curve, and PHI be the phase of the wavy discontinuous curve.

[0028] As a preferred technical solution, the fin profile of the flying wing fin is defined within a fin profile reference plane, which is perpendicular to the fin base surface and parallel to the intersection line of the windward surface and the fin base surface. The spatial coordinates of the fin profile reference plane are determined by the following formulas (7) and (8):

[0029] (7);

[0030] (8);

[0031] Where a and b are the shape parameters of the fin profile, c represents the span of the fin profile in the X-axis direction, and t is a parameter with a value between [0, 1].

[0032] The advantages and beneficial effects of this utility model are as follows:

[0033] First, by designing the fin base surface inclined and constructing it as a teardrop-shaped flying wing structure, this utility model significantly improves the overall performance of the evaporator. This structure effectively breaks the water droplet tension on the fin surface, promotes the rapid discharge of condensate along the inclined base surface, greatly reduces the risk of water accumulation and frost formation, and extends the high-efficiency operation cycle.

[0034] Secondly, the internal variable cross-section channel design achieves optimized matching of refrigerant flow rate and heat exchange load in each microchannel, improves heat exchange uniformity, avoids local temperature extremes, and reduces flow pressure drop and thermal stress.

[0035] Furthermore, by adopting a wavy, intermittent fin structure, the overall heat transfer and anti-frost performance of the evaporator is significantly enhanced.

[0036] Furthermore, while maintaining a heat exchange capacity comparable to the original design, the evaporator has been made lighter and more economical in terms of materials. The overall structure has multiple advantages, including high-efficiency heat exchange, excellent drainage and frost resistance, stable operation, and energy saving. Attached Figure Description

[0037] Figure 1 It is a two-section, side-by-side teardrop-shaped wing-type heat exchanger.

[0038] Figure 2 A schematic diagram of the height of a teardrop-shaped cross-section fin;

[0039] Figure 3 This is a schematic diagram showing the vertical distance from any point on the fin base surface to the horizontal plane of symmetry.

[0040] Figure 4 A schematic diagram showing the teardrop-shaped cross-section fin with the end face parallel to the fin base surface;

[0041] Figure 5 A schematic diagram of a serpentine wing-type heat exchanger used in gas water heaters;

[0042] Figure 6 (a) is an isometric view of the teardrop-shaped evaporator of this utility model; (b) is an isometric view of a conventional evaporator.

[0043] Figure 7 This study compares the matching degree between the internal heat exchange capacity and flow rate of teardrop-shaped and traditional evaporators. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are merely preferred embodiments, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0045] As attached Figures 1-5 The diagram shows a teardrop-shaped evaporator with inclined fin base surfaces, comprising a porous flat tube 1 and multiple fins 2 disposed thereon. The porous flat tube 1 has an opposing windward side 3 and a leeward side 5, and two fin base surfaces 4 symmetrically connected between the windward and leeward sides. The windward side 3 and the leeward side 5 are tangent to the fin base surfaces 4, and the windward side, leeward side, and the two fin base surfaces together form a teardrop-shaped cross-sectional structure symmetrical about the horizontal plane. Multiple support baffles 6 perpendicular to the horizontal plane are provided inside the porous flat tube 1. These support baffles are connected to the inner walls of the windward side 3, the leeward side 5, and the fin base surfaces 4, collectively defining multiple independent channels 7 for refrigerant flow and heat exchange.

[0046] All the flying wing fins 2 are arranged in parallel, forming a heat exchange space 9 for the flow of humid air between each pair.

[0047] like Figure 6 As shown in (b), in a traditional wing-type flat tube evaporator, the two symmetrically arranged fin base surfaces 4 are usually parallel to the horizontal plane. This structure easily causes liquid droplets to accumulate on the fin base surfaces 4 during operation, thus adversely affecting the heat dissipation performance of the evaporator. To solve this problem, such as... Figure 2 , Figure 6As shown in (a), in this embodiment, the windward surface 3 is designed as an arc surface with a radius of curvature R, and the leeward surface 5 is designed as an arc surface with a radius of curvature r, satisfying R>r. This ensures that the two symmetrically arranged fin base surfaces 4 form an inclination angle θ with the horizontal plane, resulting in a teardrop-shaped structure with one end larger and the other smaller in cross-section of the porous flat tube. Preferably, the inclination angle θ is between 3° and 7°. This angle range can effectively disrupt the surface tension of the water droplets at the fin base surface, preventing the water droplets from lingering and causing them to slide off from the fin root towards the windward and leeward directions, thereby significantly improving drainage performance and avoiding a decrease in heat dissipation efficiency due to water accumulation.

[0048] In addition, compared to Figure 2 Compared with the conventional evaporator shown, this invention effectively reduces the total heat exchange area and material usage outside the evaporator while maintaining the basic heat exchange performance, thus achieving a lightweight design of the device under constant thermal performance requirements.

[0049] In practical applications, the teardrop-shaped flying wing fins with inclined fin base surfaces described in this embodiment can be constructed into a serpentine coil evaporator through a bending process. However, since the fin base surface 4 is inclined at an angle θ to the horizontal plane, if the flying wing fins 2 adopt a uniform height design, the root of the flying wing fin 2 is perpendicular to the fin base surface, and the plane containing the tops of all flying wing fins 2 is parallel to the fin base surface 4; the formula for the height of the flying wing fin 2 (the height refers to the vertical dimension from the root where the fin connects to the fin base surface to the top of the fin) is designed as follows:

[0050] (1),

[0051] In the formula, z fh (x) represents the fin height at coordinate x along the x-axis; the coordinate system is set as follows: the intersection of the porous flat tube cross section and the fin base surface 4 is taken as the x-axis, the intersection of the windward side 3 and the fin base surface 4 is taken as the y-axis, the intersection of the two axes is taken as the origin, and the z-axis is taken as the direction perpendicular to the fin base surface 4 and extending along the flying wing fin 2; L represents the total length of the fin base surface in the x-axis direction, that is, the projected distance between the intersection of the windward side and the fin base surface and the intersection of the leeward side and the fin base surface.

[0052] However, this design causes the spacing between adjacent flying wing fins 2 to gradually increase from the windward side 3 to the leeward side 5, forming a triangular gap structure that is not conducive to evaporative heat exchange.

[0053] To eliminate this defect, in a preferred embodiment, the height of the flying wing fin 2 is differentiated as follows:

[0054] (2),

[0055] In the formula, z fh(x) represents the fin height at coordinate x along the x-axis. The coordinate system is set as follows: the intersection of the porous flat tube cross-section and the fin base surface 4 is the x-axis, the intersection of the windward side 3 and the fin base surface 4 is the y-axis, the intersection of the two axes is the origin, and the z-axis is perpendicular to the fin base surface 4 and extends along the flying wing fin 2. L represents the total length of the fin base surface in the x-axis direction, that is, the projected distance between the intersection of the windward side and the fin base surface and the intersection of the leeward side and the fin base surface. Through the above height optimization design, the top endpoints of all fins are ultimately located at the same horizontal height 8, thus forming equally spaced and parallel airflow channels. This ensures that the spacing between adjacent fins remains uniform, effectively improving airflow distribution, enhancing heat exchange efficiency, and avoiding the problem of increased local flow resistance or frost blockage caused by uneven gaps, thereby improving the overall performance and reliability of the evaporator.

[0056] The fin base surface 4 forms an inclination angle θ with the horizontal plane. To clearly describe the spatial position of the fin base surface, the following coordinate system is established: the intersection of the horizontal symmetry plane and the flow section of the porous flat tube is defined as the X-axis, and the vertical upward direction is defined as the W-axis. Under this coordinate system, the vertical distance from any point on the fin base surface to the horizontal symmetry plane is determined by the following formula (3): ;

[0057] Where w(x) represents the vertical distance of the fin base surface relative to the horizontal plane of symmetry when the coordinate is x on the x-axis; θ represents the tilt angle between the fin base surface and the horizontal plane; and x represents the coordinate of a point on the fin base surface in the X-axis direction.

[0058] Through the above structural design and coordinate definition, the spatial geometric relationship of the inclined fin base surface can be accurately characterized, providing a theoretical basis for the optimized design of fin parameters.

[0059] In some preferred embodiments, the porous flat tube 1 is divided by the supporting partition 6 to form multiple independent channels 7 for refrigerant flow and heat exchange, and the cross-sectional area of ​​each channel decreases sequentially from the windward side 3 to the leeward side 5. This gradual channel design makes the mass flow rate distribution of refrigerant in each channel more matched with the external heat load distribution, significantly improving the uniformity of internal heat exchange capacity utilization.

[0060] This structure effectively promotes the uniform temperature distribution of the refrigerant during flow, reduces local overheating or undercooling, and avoids heat transfer instability and thermal stress concentration caused by uneven temperature, thereby improving the overall reliability and heat exchange efficiency of the evaporator.

[0061] In some specific embodiments, the wing-shaped fins are arranged at equal intervals along the length of the porous flat tube.

[0062] In some specific embodiments, the flying wing fin is a wavy discontinuous fin, which is formed by scanning a wavy discontinuous curve on the fin base surface along a fin profile line perpendicular to the fin base surface, and the wavy discontinuous curve is composed of multiple curves.

[0063] Specifically, the wavy discontinuous curve uses the fin base surface as the reference plane, the intersection of the windward side and the fin base surface as the y-axis, and the intersection of the flat tube cross-section and the fin base surface as the x-axis. The equation of the wavy discontinuous curve is as follows:

[0064] ;

[0065] ;

[0066] ;

[0067] In the above formula, L represents the total length of the fin base surface in the x-axis direction, i.e., the projected distance between the intersection of the windward side and the fin base surface and the intersection of the leeward side and the fin base surface; RIDi is the proportion of the span of the i-th curve in the x-axis to L among the multiple curves constituting the wavy discontinuous curve, x... i Let x be the x-coordinate of the i-th curve, and y be the y-coordinate of the i-th curve i Let y be the y-coordinate corresponding to the i-th curve, t be a parameter with a value range of [0,1], WA be the amplitude of the wavy discontinuous curve, WL be the wavelength of the wavy discontinuous curve, I be the discontinuity of the wavy discontinuous curve, and PHI be the phase of the wavy discontinuous curve; and i=2, RID1=0.5, RID2=0.5, WA=1mm, WL=6mm, and I=1mm.

[0068] By employing a wavy, discontinuous fin structure, the overall heat transfer and anti-frost performance of the evaporator is significantly enhanced. The fins, with their periodic wavy profile, effectively disrupt the airflow boundary layer, continuously inducing fluid turbulence and vortices, thereby strengthening convective heat transfer efficiency. Simultaneously, the wavy structure increases the effective heat transfer area, optimizes the drainage path of condensate on the fin surface, avoids droplet retention, and delays frost formation and accumulation. The discontinuous wavy design also helps to balance airflow distribution, reduce flow resistance, lower fan energy consumption, and promote rapid frost removal and drainage during the defrosting stage, significantly improving the evaporator's operational stability and energy efficiency under low-temperature and high-humidity conditions.

[0069] The fin profile of the flying wing fin 2 is defined within a fin profile reference plane, which is perpendicular to the fin base surface 4 and parallel to the intersection of the windward surface 3 and the fin base surface 4. The spatial coordinates of the fin profile reference plane are determined by the following formulas (7) and (8):

[0070] (7); (8);

[0071] Where a and b are the shape parameters of the fin profile, c represents the span of the fin profile in the X-axis direction, and t is a parameter with a value between [0,1]. In a preferred embodiment, the parameter values ​​are a=12 and b=0.35.

[0072] Formulas (7) and (8) precisely define the geometric profile and spatial orientation of the fin profile through parametric equations, which can effectively control the airflow organization and boundary layer development on the fin surface, enhance disturbance and strengthen heat transfer. By using the above specific parameter combination, the surface area utilization efficiency and overall heat transfer performance of the fin can be significantly improved while ensuring structural strength, and it is also beneficial to optimize the fluid flow resistance characteristics.

[0073] Application examples

[0074] like Figure 7 As shown, in a specific embodiment of this utility model, the teardrop-shaped wing-type evaporator is applied to a gas water heater system, with the following operating conditions: flue gas inlet temperature 905℃ and flow rate 0.24... The water-side inlet temperature is 15℃ and the flow rate is 0.14. The test results for this operating condition are as follows: Figure 7 As shown, compared with the traditional flat-tube evaporator with a straight cross-section, this invention significantly improves the matching performance of flow rate and heat exchange in the internal refrigerant channels while maintaining a basically equivalent total heat exchange. Specifically, when channels 7 are numbered 1, 2, 3, and 4 sequentially along the direction away from the flue gas side, the cross-sectional area of ​​each channel is 28.50 mm². 2 17.58 mm 2 14.20 mm 2 11.97 mm 2 The heat transfer ratio per unit mass flow rate of each channel was optimized from the original 1.39, 1.14, 0.80, 0.67 to 0.98, 1.04, 0.98, 0.99, showing excellent distribution uniformity.

[0075] Meanwhile, the highest temperature of the internal channel wall of the evaporator described in this utility model is reduced from 278°C to 240°C, a decrease of 13.67%; the internal flow pressure drop is reduced by 29.11%, the flue gas side pressure drop is reduced by 17.93%, the highest temperature of the fins is reduced by 7.51%, and the overall material usage is reduced by 2.63%.

[0076] The above data shows that this utility model, through its teardrop-shaped cross-section design and wing-shaped fin layout, achieves efficient and balanced utilization of heat exchange capacity, effectively suppresses local heat load and flow instability, and significantly improves heat exchange efficiency and system operating economy.

[0077] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A teardrop-shaped wing-type evaporator with inclined sidewalls, comprising a porous flat tube (1) and a plurality of wing-type fins (2) disposed thereon, characterized in that: The porous flat tube (1) includes a windward surface (3) and a leeward surface (5) arranged opposite to each other, and two fin base surfaces (4) symmetrically connected between them; the windward surface (3) and the leeward surface (5) are tangent to the fin base surface (4) respectively, and the windward surface, the leeward surface and the two fin base surfaces together form a teardrop-shaped cross-sectional structure symmetrical about the horizontal plane; the windward surface (3) is an arc surface with a radius of curvature R, and the leeward surface (5) is an arc surface with a radius of curvature r, and satisfies R>r; the two fin base surfaces (4) are both inclined at an angle θ to the horizontal plane. The wing-shaped fins (2) are disposed on the fin base surface (4) and form equally spaced airflow channels.

2. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 1, characterized in that: The tilt angle θ ranges from 3° to 7°.

3. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 1, characterized in that: The height variation of the flying wing fin (2) satisfies the following relationship: （1）； Among them, z fh (x) represents the fin height at coordinate x in the X-axis direction; the coordinate system is set as follows: the intersection of the porous flat tube section and the fin base surface (4) is taken as the X-axis, the intersection of the windward side (3) and the fin base surface (4) is taken as the Y-axis, the intersection of the two axes is taken as the origin, and the Z-axis is taken as the direction perpendicular to the fin base surface (4) and extending along the flying wing fin (2); L represents the total length of the fin base surface in the X-axis direction, that is, the projection distance between the intersection of the windward side and the fin base surface and the intersection of the leeward side and the fin base surface.

4. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 1, characterized in that: The height of the flying wing fin (2) remains constant along the X-axis, satisfying the following relationship: （2）； Where zfh(x) represents the fin height at coordinate x in the X-axis direction; the coordinate system is set as follows: the intersection of the porous flat tube cross section and the fin base surface is taken as the X-axis, the intersection of the windward side and the fin base surface is taken as the Y-axis, the intersection of the two axes is taken as the origin, and the Z-axis is taken as the direction perpendicular to the fin base surface and along the extension direction of the flying wing fin; L represents the total length of the fin base surface in the X-axis direction, that is, the projected distance between the intersection of the windward side and the fin base surface and the intersection of the leeward side and the fin base surface.

5. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 1, characterized in that: The X-axis is defined as the intersection of the horizontal plane of symmetry and the flow section of the porous flat tube, and the W-axis is defined as the vertical upward direction. In this coordinate system, the vertical distance from any point on the fin base surface to the horizontal plane of symmetry is determined by the following formula (3): （3）； Where w(x) represents the vertical distance of the fin base surface relative to the horizontal plane of symmetry when the coordinate is x on the X-axis; θ represents the tilt angle between the fin base surface and the horizontal plane; and x represents the coordinate of a point on the fin base surface in the X-axis direction.

6. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 1, characterized in that: The porous flat tube (1) has multiple supporting partitions (6) inside, which divide the internal space into multiple independent channels (7) for refrigerant flow and heat exchange.

7. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 6, characterized in that: The cross-sectional area of ​​the multiple channels (7) decreases sequentially from the windward side (3) to the leeward side (5).

8. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 1, characterized in that: The flying wing fin (2) is a wavy discontinuous fin, which is formed by scanning the wavy discontinuous curve on the base surface (4) along the direction perpendicular to the base surface.

9. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 8, characterized in that: The flying wing fin is a wavy, discontinuous fin. The wavy, discontinuous fin is formed by scanning a wavy, discontinuous curve on the base surface of the fin along a fin profile line perpendicular to the base surface of the fin. The wavy, discontinuous curve is composed of multiple curves.

10. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 9, characterized in that: The wavy discontinuous curve uses the fin base surface as the reference plane, the intersection of the windward side and the fin base surface as the Y-axis, and the intersection of the flat tube cross-section and the fin base surface as the X-axis. The equation of the wavy discontinuous curve is as follows: （4）； （5）； （6）； In the above formula, L represents the total length of the fin base surface in the X-axis direction, i.e., the projected distance between the intersection of the windward side and the fin base surface and the intersection of the leeward side and the fin base surface; RIDi is the proportion of the span of the i-th curve in the X-axis to L among the multiple curves constituting the wavy discontinuous curve, x i Let x be the x-coordinate of the i-th curve, and y be the y-coordinate of the i-th curve. i Let y be the y-coordinate of the i-th curve, t be a parameter with a value in the range of [0,1], WA be the amplitude of the wavy discontinuous curve, WL be the wavelength of the wavy discontinuous curve, I be the discontinuity of the wavy discontinuous curve, and PHI be the phase of the wavy discontinuous curve.

11. The teardrop-shaped wing-type evaporator with inclined sidewalls according to claim 1, characterized in that: The fin profile of the flying wing fin (2) is defined in a fin profile reference plane, which is perpendicular to the fin base surface (4) and parallel to the intersection of the windward surface (3) and the fin base surface (4); the spatial coordinates of the fin profile reference plane are determined by the following formulas (7) and (8): （7）； （8）； Where a and b are the shape parameters of the fin profile, c represents the span of the fin profile in the X-axis direction, and t is a parameter with a value between [0, 1].

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