Fin structure imitating shark gill fissure
By using a shark gill slit fin structure and biomimetic curved fin and gill slit design, the problem of insufficient cold air mixing in traditional fin structures is solved, achieving more efficient heat exchange performance, especially significantly improving the cooling effect under high flow rate conditions.
Patent Information
- Application Number
- CN202520398922.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-09
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-03-09
AI Technical Summary
The fin structure of traditional intercoolers prevents cold air from mixing sufficiently during flow, resulting in low heat exchange capacity. Existing louvered fins have the airflow direction perpendicular to the heat flow direction, affecting the heat exchange between cold and hot air and resulting in low heat exchange performance.
It adopts a shark gill slit fin structure, including biomimetic curved fins and flow channel baffles. The fins are composed of multiple shark-shaped curved units. The gill slit opening design increases the heat exchange area, and the flow channel cross-sectional area is adjusted by trigonometric function curves to promote the mixing and heat exchange of cold air during the flow process.
It enhances the synergistic effect of the temperature field and velocity field, disrupts the boundary layer, improves heat transfer efficiency, reduces the cold air outlet temperature, significantly improves heat exchange efficiency, and enhances overall performance by 15.16%-76.24%.
Smart Images
Figure CN223608640U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of cooling equipment, and particularly relates to a shark gill slit fin structure. BACKGROUND
[0002] The turbocharged intercooler technology refers to compressing exhaust gas of a vehicle by using a turbocharger, increasing the density of the exhaust gas after compression, increasing the intake amount of the cylinder per unit time, making the fuel combustion in the cylinder more sufficient, thereby increasing the output power of the vehicle and reducing the emission of pollutants. However, the temperature and pressure of the air after being pressurized will rapidly rise, and if the air after being pressurized is directly sent into the combustion chamber, it is easy to cause the shock and explosion phenomenon. In order to avoid the occurrence of this phenomenon, the air after being pressurized needs to be cooled by an intercooler, thereby effectively reducing the pollutant content in the exhaust gas and improving the fuel combustion efficiency.
[0003] The traditional intercooler adopts straight fins, has the advantages of simple structure and easy processing, but the flow channels are independent of each other, and the cold air in different flow channels cannot be fully mixed in the flow process, resulting in low heat exchange capacity. In order to solve this problem, the louver fin intercooler is widely used, but the speed direction of the existing louver fin is basically parallel to the length direction of the fin when the air flows, and is perpendicular to the heat flow direction, so the coordination of the velocity field and the temperature field is poor, which will affect the heat exchange between the cold air and the hot air, resulting in low heat exchange performance of the intercooler. SUMMARY
[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a shark gill slit fin structure.
[0005] The utility model solves the technical problem by adopting the following technical scheme:
[0006] A shark gill slit fin structure, comprising a bionic curved fin and a flow channel partition plate; a plurality of bionic curved fin groups are arranged between two flow channel partition plates, each bionic curved fin group comprises two symmetrically arranged bionic curved fins, the two bionic curved fins of the same bionic curved fin group are arranged towards each other and form a first flow channel therebetween, the two bionic adjacent curved fins of adjacent bionic curved fin groups are arranged away from each other and form a second flow channel therebetween, and the cross-sectional areas of the first flow channel and the second flow channel periodically change; the bionic curved fin is formed by arranging a plurality of shark-shaped curved fin monomers, a plurality of shark gill slit openings are arranged in the middle of the shark-shaped curved fin monomer, and an inclined gill slit plate is arranged at the edge of each shark gill slit opening.
[0007] Further, the shape of the shark-shaped curved fin monomer in the length and height directions satisfies a trigonometric function curve.
[0008] Further, the amplitude of the trigonometric function curve is 0-2.
[0009] Further, the inclination angle of the gill slit is 0-90°, the thickness of the gill slit is not greater than the thickness of the bionic curved fin, and the maximum distance from the free side of the gill slit to the outer tangent surface of the shark-shaped curved fin monomer is not greater than 0.5W1, W1 being the width at the inlet of the second flow channel.
[0010] Further, the ratio of the width of the second flow channel to the width at the inlet of the first flow channel is 0.5-1.5.
[0011] Further, the thickness of the flow channel partition is 0.2-1mm, and the thickness of the bionic curved fin is 0.1-0.3mm.
[0012] Further, the number of gill slits on the shark-shaped curved fin monomer is 3-7, and the spacing between adjacent gill slits is 0.1-1mm.
[0013] Compared with the prior art, the beneficial effects of the present application are:
[0014] The bionic curved fin of the present application is formed by an array of a plurality of shark-shaped curved fin monomers, and the shape of the shark-shaped curved fin monomer in the length and height directions satisfies a trigonometric function curve. The traditional flat fin is curved, the heat exchange area is increased, and the cross-sectional area of the first flow channel and the second flow channel changes periodically, so that the flow direction and speed of the cold air change constantly during the flow process, the synergy of the temperature field and the velocity field is enhanced, the boundary layer is destroyed, the heat transfer is strengthened, and the outlet temperature of the hot air is greatly reduced. Due to the existence of the shark gill slit opening and the gill slit, a small part of the cold air in the first flow channel flows out through the shark gill slit opening and mixes with the cold air in the second flow channel, which promotes the shuttle flow of the cold air in different flow channels and helps to improve the heat exchange efficiency. During the process of the cold air flowing out of the shark gill slit opening, heat exchange is carried out with the gill slit, and the heat exchange effect is further enhanced.
[0015] The simulation results show that, compared with the traditional flat fin and louver fin structure, the fin structure of the present application can significantly enhance the comprehensive performance of the heat exchanger, and therefore the structure is of great significance to improve the heat exchange performance of the heat exchanger. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a structural schematic diagram of Example 1;
[0017] Figure 2 is a cross-sectional view of Example 1;
[0018] Figure 3 is a top view of the first flow channel;
[0019] Figure 4 Fig. 4 is a temperature distribution diagram of the fin structure of Example 1 on the central plane in the height direction at different cold air inlet flow rates, wherein the cold air inlet flow rates of (a), (b) and (c) are 4 m / s, 6 m / s and 12 m / s respectively;
[0020] Figure 5 Fig. 5 is a temperature distribution diagram of the louver fin structure on the central plane in the height direction at different cold air inlet flow rates,
[0021] Fig. 5 is a temperature distribution diagram of the louver fin structure on the central plane in the height direction at different cold air inlet flow rates,
[0022] Figure 6 Fig. 6 is a comparison diagram of j factor and f factor of Example 1 and different fin structures at different cold air inlet flow rates;
[0023] Figure 7 Fig. 7 is a comparison diagram of JF factor of Example 1 and different fin structures at different cold air inlet flow rates;
[0024] Figure 8 Fig. 8 is a structure diagram of Example 2;
[0025] Figure 9 Fig. 9 is a comparison diagram of j factor and f factor of Example 2 and different fin structures at different cold air inlet flow rates;
[0026] Figure 10 Fig. 10 is a comparison diagram of JF factor of Example 2 and different fin structures at different cold air inlet flow rates;
[0027] Fig. 1: 1-bionic curved fin; 2-flow channel partition; 3-gill slit piece. DETAILED DESCRIPTION
[0028] The specific embodiments are described below with reference to the accompanying drawings, which are only used to specifically introduce the technical schemes of the utility model, and do not limit the protection scope of the present application.
[0029] The utility model provides a kind of imitative shark gill split fin structure, including bionic curved surface fin 1 and flow channel partition 2;Multiple bionic curved surface fin groups are arrayed between two flow channel partitions 2, each bionic curved surface fin group includes two symmetrically arranged bionic curved surface fins 1, the two bionic curved surface fins 1 of a same bionic curved surface fin group are oppositely arranged and form non-uniform first flow channel between them, the two bionic adjacent curved surface fins 1 of adjacent bionic curved surface fin group are oppositely arranged and form non-uniform second flow channel between them, cold air flows in first flow channel and second flow channel;Bionic curved surface fin 1 is formed by multiple imitative shark shape curved surface fin monomers array, and adjacent imitative shark shape curved surface fin monomer is connected, and the middle part of imitative shark shape curved surface fin monomer is provided with multiple imitative shark gill split openings, and one inclined gill slit 3 is arranged on the edge of each imitative shark gill split opening.
[0030] The shape of the imitative shark shape curved surface fin monomer in length and height direction all satisfies trigonometric function curve, so the cross-sectional area of first flow channel and second flow channel all periodically changes, the cross-sectional area of first flow channel circulates in the form of first expansion and then shrinkage, and there is maximum cross-sectional area at the maximum radian of oppositely arranged two imitative shark shape curved surface fin monomers, and there is minimum cross-sectional area at side edge;The cross-sectional area of second flow channel circulates in the form of first shrinkage and then expansion, and there is minimum cross-sectional area at the maximum radian of oppositely arranged two imitative shark shape curved surface fin monomers, and there is maximum cross-sectional area at side edge. The amplitude of imitative shark shape curved surface fin monomer is 0-2, and wavelength can be set according to actual requirement, and wavelength has the greatest influence on heat dissipation performance.
[0031] The thickness of flow channel partition 2 is 0.2-1mm, and the thickness of bionic curved surface fin 1 is 0.1-0.3mm.
[0032] The number of gill slit 3 on imitative shark shape curved surface fin monomer is 3-7, the spacing between adjacent gill slit 3 is 0.1-1mm, the inclination angle θ of gill slit 3 is 0-90°, the thickness of gill slit 3 is not greater than the thickness of bionic curved surface fin 1, and the maximum distance between free side of gill slit 3 and outer tangent surface of imitative shark shape curved surface fin monomer is not greater than 0.5W1, and W1 is the width of second flow channel inlet.
[0033] The height of first flow channel and second flow channel is set according to actual requirement, and the ratio of the width of second flow channel and first flow channel inlet W1 / W is 0.5-1.5.
[0034] The working principle and working process of the utility model are as follows:
[0035] The cold air enters the first flow channel and the second flow channel respectively, due to the flow guiding effect of the bionic curved fin 1 and the change of the cross-sectional area of the flow channel, the flow direction and the speed of the cold air are changed constantly, so that the vortex is generated, the turbulence intensity is enhanced, the boundary layer of the cold air is destroyed, and the heat exchange between the bionic curved fin 1 and the cold air is strengthened. When the cold air flows through the first flow channel, a small part of the cold air flows out through the shark gill slit opening, which is equivalent to a jet flow at the moment of flowing out, so that the boundary layer is destroyed, and the cold air after flowing out is guided by the gill slit 3 and exchanges heat with the gill slit 3 in the guiding process, thereby further increasing the heat exchange area. The cold air after flowing out is finally mixed with the cold air in the second flow channel, so that the heat exchange effect can be further enhanced. The application range of the utility model includes but is not limited to intermediate cooler, tube-fin heat exchanger and plate-fin heat exchanger.
[0036] Embodiment 1
[0037] The bionic shark gill slit fin structure of the embodiment comprises two bionic curved fin groups, the thickness of the flow channel partition plate 2 is 0.3mm, the flow channel height is 6mm, the flow channel length is 40mm, the bionic curved fin thickness is 0.2mm, the gill slit 3 thickness is 0.1mm, the gill slit 3 inclination angle is 45°, the number of gill slits 3 on the bionic shark shape curved fin monomer is 3, the amplitude of the trigonometric function curve in the length direction of the bionic shark shape curved fin monomer is 0.75mm, the wavelength is 4mm, the amplitude of the trigonometric function curve in the height direction of the bionic shark shape curved fin monomer is 0.5mm, and the wavelength is 6mm; the width ratio W1 / W of the second flow channel to the first flow channel entrance is 1.22, wherein the width W1 of the second flow channel entrance is 3.3mm, the gill slit 3 spacing is 0.16, and the maximum distance between the free side of the gill slit 3 and the bionic shark shape curved fin monomer excircle is 0.8mm.
[0038] Figure 4 The temperature distribution diagram of the fin structure of the embodiment on the height direction center surface under different cold air inlet flow rates, wherein the cold air inlet flow rates of (a), (b) and (c) are 4m / s, 6m / s and 12m / s respectively; Figure 5 The temperature distribution diagram of the louver fin structure on the height direction center surface under different cold air inlet flow rates, wherein the cold air inlet flow rates of (a), (b) and (c) are 4m / s, 6m / s and 12m / s respectively.
[0039] By Figure 4 , 5It can be seen that the low-temperature zone (temperature less than 310K) of the fin structure of the embodiment is concentrated in the front half of the flow channel at different cold air inlet flow rates; for the louver fin structure, the low-temperature zone extends to the flow channel outlet, and the higher the cold air inlet flow rate, the more the low-temperature zone, especially when the cold air inlet flow rate is 12m / s, the cold air basically has not been fully heat-exchanged with the fin before flowing out of the flow channel. Therefore, the fin structure of the embodiment has better heat exchange effect, because the contact area between the fin structure of the embodiment and the cold air is larger, and the synergy of the velocity field and the temperature field is enhanced. Specifically, the flow channel with periodically varying cross-sectional area is formed between the two bionic curved fin surfaces, the flow rate of the cold air decreases and the static pressure increases in the expansion section of the flow channel, resulting in intense vortex, while the flow rate increases and the static pressure decreases in the contraction section, which washes the boundary layer of the cold air and thins the boundary layer, thereby enhancing the heat transfer. At the same time, a small part of the cold air in the first flow channel flows out through the shark gill slit opening and fully mixes with the cold air in the second flow channel, promoting the mutual penetration of the cold air between different flow channels, making the angle between the flow direction and the velocity direction smaller, and the boundary layer is destroyed when flowing through the gill slit, so that the heat exchange between the cold air and the fin is more sufficient, and the temperature of the cold air is rapidly increased, and the temperature uniformity is improved. For the louver fin structure, only a small part of the cold air near the fin changes the flow direction due to the existence of the louver after entering the flow channel, but most of the cold air in the center of the flow channel is basically not disturbed by the louver during the flow process. The cold air in the center of the flow channel flows through the flow channel at a speed parallel to the flow direction, so the low-temperature zone extends to the flow channel outlet position, and thus the heat exchange effect between the cold air and the fin is poor, and the temperature distribution uniformity is poor.
[0040] Figure 6 The figure is a comparison of j factor and f factor of the embodiment and different fin structures at different cold air inlet flow rates. The j factor and f factor respectively reflect the heat exchange performance and flow resistance characteristics of the fin structure. As can be seen from the figure, the heat exchange performance of the fin structure of the embodiment is significantly improved, and the j factor is always the largest. Compared with the louver fin structure, the j factor is improved by an average of 36.34%, and the maximum improvement is 51.07% when the cold air inlet flow rate is 12m / s. Compared with the flat fin structure, the j factor is improved by an average of 67.62%, and the maximum improvement is 76.24% when the cold air inlet flow rate is 12m / s. Although the fin structure of the embodiment increases the flow resistance (f factor), it does not affect the improvement of the comprehensive performance.
[0041] Figure 7is the JF factor comparison chart of the fin structure of the embodiment and different fin structures under different cold air inlet flow rates.
[0042] Through the above comparative analysis, it can be found that the heat exchange capacity and comprehensive performance of the fin structure of the embodiment are greatly improved.
[0043] Embodiment 2
[0044] The difference between the embodiment and embodiment 1 is that the wavelength of the triangular function curve in the length direction of the shark-shaped surface fin monomer is changed from 4mm to 8mm, and the specific structure is shown in Figure 8 .
[0045] Figure 9 is the j factor and f factor comparison chart of the fin structure of the embodiment and different fin structures under different cold air inlet flow rates; Figure 10 is the JF factor comparison chart of the fin structure of the embodiment and different fin structures under different cold air inlet flow rates. The comprehensive performance of the fin structure of the embodiment is significantly enhanced, and compared with the flat fin and the louver fin structure, the comprehensive performance is improved by 35.34% and 17.74% on average, and the comprehensive performance is further improved compared with embodiment 1, which is mainly due to the smaller pressure drop caused by the larger wavelength under the same amplitude, so the friction is smaller, the heat transfer performance (j factor) changes little, and therefore better comprehensive performance is obtained.
[0046] The unmentioned part of the utility model is applicable to the prior art.
Claims
1. A shark gill fin-like structure, characterized in that, The fin structure includes biomimetic curved fins and flow channel baffles; several biomimetic curved fin groups are arrayed between the two flow channel baffles, each biomimetic curved fin group includes two symmetrically arranged biomimetic curved fins, the two biomimetic curved fins in the same biomimetic curved fin group are arranged facing each other and form a first flow channel between them, the two biomimetic adjacent curved fins in adjacent biomimetic curved fin groups are arranged back to back and form a second flow channel between them, the cross-sectional areas of the first flow channel and the second flow channel change periodically; The biomimetic curved fin is composed of an array of multiple shark-shaped curved fin units. The center of each shark-shaped curved fin unit is provided with multiple shark-shaped gill slits, and an inclined gill slit is provided at the edge of each shark-shaped gill slit.
2. The shark gill-like fin structure according to claim 1, characterized in that, The shape of the shark-shaped curved fins in both length and height directions satisfies a trigonometric function curve.
3. The shark gill fin structure according to claim 2, characterized in that, The amplitude of the trigonometric function curve is 0-2.
4. The shark gill fin structure according to claim 1, characterized in that, The gill slits have an inclination angle of 0-90°, the thickness of the gill slits is not greater than the thickness of the biomimetic curved fins, and the maximum distance between the free side of the gill slits and the outer tangent of the shark-shaped curved fin unit is not greater than 0.5W1, where W1 is the width at the inlet of the second flow channel.
5. The shark gill fin structure according to claim 1, characterized in that, The width ratio of the second flow channel to the inlet width of the first flow channel is 0.5-1.
5.
6. The shark gill fin structure according to claim 1, characterized in that, The thickness of the flow channel baffle is 0.2-1mm, and the thickness of the biomimetic curved fins is 0.1-0.3mm.
7. The shark gill fin structure according to claim 1, characterized in that, The number of gill slits on the shark-shaped curved fin unit is 3-7, and the distance between adjacent gill slits is 0.1-1mm.