Asymmetric staggered rib inner cooling structure and field synergy analysis method

Abstract

The application provides an asymmetric staggered rib internal cooling structure and field coordination analysis method, and belongs to the technical field of internal cooling of a turbine blade of an aero-engine. The asymmetric staggered rib internal cooling structure comprises a rectangular channel, and upper ribs and lower ribs are arranged on two wall surfaces in the rectangular channel respectively. The upper ribs and the lower ribs are overlapped in space, and the rectangular channel is divided into a series of interwoven and closely arranged sub-channels in space. The upper ribs and the lower ribs have different inclination angles with a main flow direction, and form an asymmetric staggered rib structure. The heat transfer strengthening mechanism of the staggered rib structure is concentrated in a fluid turning area of a side wall of the channel. When cooling air flows in the sub-channels, the cooling air is guided by the asymmetric rib inclination angles, impacts a windward surface of the rib and generates a stagnation effect, converts kinetic energy into pressure energy, violently destroys a thermal boundary layer, and then the fluid turns over on the side wall, generates strong secondary flow and turbulent disturbance, and deeply mixes cold fluid in a core area of the channel with hot fluid near the side wall.

Description

Technical Field

[0001] This invention belongs to the field of internal cooling technology for aero-engine turbine blades, and relates to an asymmetric staggered rib internal cooling structure and a field synergy analysis method. Background Technology

[0002] The development of modern aero-engines and gas turbines is rapidly advancing towards higher thrust-to-weight ratios and better thermal cycle efficiency. In thermodynamic cycles, one of the core approaches to achieving this goal is to continuously increase turbine inlet temperature. However, current turbine inlet temperatures far exceed the temperature resistance limits of even the most advanced high-temperature single-crystal alloys. To ensure the long-term stable operation of turbine blades under extreme high-temperature conditions, efficient cooling technologies must be employed. Among numerous technologies, the internal cooling structure of the turbine blade forms the cornerstone of the entire thermal protection system. Traditional internal cooling mechanisms primarily rely on introducing cooling air from the blade root, allowing it to flow through a complex channel system within the turbine blade, and then exiting through the blade tip, trailing edge, and film cooling holes.

[0003] Over the past few decades, straight channels, U-shaped channels, and arrays of spoiler columns with baffles have been widely used. While these traditional cooling channels are technologically mature, their cooling potential is gradually approaching its physical limits. Although straight channels with baffles have relatively low flow resistance, their overall heat transfer enhancement level is limited. When facing the extremely high local heat flux density at the leading edge and mid-section of new-generation high-performance engines, they often require excessive cooling air, which weakens the compressor's work capacity and reduces the overall cycle efficiency of the engine. Therefore, there is an urgent need to develop new internal cooling structures with breakthrough heat transfer capabilities.

[0004] To address these challenges, staggered-rib cooling structures have become a key configuration. The staggered-rib structure is a highly complex three-dimensional structure. Unlike traditional methods that arrange baffles within a single flow channel, the staggered-rib structure consists of two layers of parallel ribs intersecting at a specific angle, dividing the main channel into a series of interwoven, closely spaced micro-parallelogram sub-channels. Upon entering the staggered-rib region, the airflow is forced to travel along this network of tiny sub-channels, experiencing severe flow deflection at the intersections, forming complex interwoven streamlines.

[0005] Compared to traditional structures, the staggered rib structure offers significant advantages in heat transfer enhancement and structural strength. First, the numerous segmented sub-channels greatly expand the effective convective heat transfer area. Second, the airflow undergoes continuous and intense rotation, impact, and tumbling within the sub-channels, and the high-shear flow severely disrupts the thermal boundary layer near the wall, allowing for deep mixing of the cold fluid in the channel core and the hot fluid near the wall. The interlocking and tightly connected ribs form a more robust three-dimensional structure within the blade, significantly enhancing its overall strength.

[0006] In summary, staggered rib cooling structures represent the mainstream direction of next-generation turbine blade internal cooling technology. However, the vast majority of studies have adopted highly symmetrical geometric configurations (such as 30°-30° or 45°-45°). While symmetrical structures are easy to implement, they cannot fully utilize the optimal coupling potential between the flow field and temperature field induced by different deflection angles of the cooling fluid.

[0007] In studies of 30°-45° asymmetric staggered rib structures, the evolution mechanism of their flow resistance and heat transfer has consistently lacked theoretical analysis. Field synergy theory indicates that the intensity of convective heat transfer and the flow resistance of a fluid are profoundly dependent on the spatial angle between the velocity field and the temperature gradient, and between the velocity gradient and the temperature gradient (i.e., the synergy angle). Therefore, it is necessary to introduce field synergy analysis methods to study this novel structure, explaining how it achieves optimal matching between enhanced heat transfer and flow resistance by analyzing spatial angular relationships. Summary of the Invention

[0008] To address the challenge of excessive flow resistance loss in the traditional symmetrical staggered rib structure for enhancing heat transfer during the internal cooling of aero-engine turbine blades, this invention proposes an asymmetrical staggered rib internal cooling structure. By introducing a field synergistic analysis method, starting from the underlying thermodynamic and fluid dynamic mechanisms, the mutual constraint between heat transfer enhancement and pressure loss control is broken, thereby achieving comprehensive performance optimization of the turbine blade internal cooling channel under high heat load.

[0009] To achieve the above objectives, in a first aspect, the present invention provides an asymmetric staggered rib internal cooling structure, comprising a rectangular channel, wherein upper ribs and lower ribs are respectively provided on two walls of the rectangular channel; the upper ribs and lower ribs overlap each other in space, dividing the rectangular channel into a series of interwoven and closely arranged sub-channels; the upper ribs and lower ribs have different inclination angles with the main flow direction, thus forming an asymmetric staggered rib structure.

[0010] Furthermore, the angle of the upper rib γ Set to 30°, lower rib angle θ Set at 45°, forming an asymmetric staggered rib structure with a combination of 30°-45°.

[0011] Furthermore, in the asymmetric staggered rib structure, the contact surfaces of the upper and lower ribs are tightly connected at the intersection nodes, and the upper and lower ribs are integrally formed with the rectangular channel wall.

[0012] Furthermore, two adjacent ribs in the upper rib are arranged in parallel, and two adjacent ribs in the lower rib are arranged in parallel; the ribs of the upper and lower ribs have the same geometric dimensions, and the total height of the rectangular channel is set to twice the height of the staggered ribs.

[0013] Secondly, this invention provides a field synergy analysis method for an asymmetric staggered rib internal cooling structure as described above, specifically including the following steps: Extract three-dimensional velocity, temperature, and pressure field data under steady-state flow conditions within a rectangular channel; Perform heat transfer field synergy analysis, using the heat transfer field synergy angle β The degree of coordination between the velocity vector and the temperature gradient vector is quantized. Perform flow resistance field cooperative analysis, using the flow resistance field cooperative angle. α The degree of coordination between the velocity vector and the velocity gradient vector is quantized.

[0014] Furthermore, the extraction of three-dimensional velocity, temperature, and pressure field data under steady-state flow conditions within the rectangular channel specifically includes: A near-wall mesh is constructed based on a geometric model of a rectangular channel, wherein the near-wall mesh is a low Reynolds number mesh that can completely resolve the near-wall viscous layer, and the first layer mesh has a dimensionless wall distance y+ < 1. Based on the near-wall mesh, the full-field numerical solution of the steady flow state in the rectangular channel is obtained by numerically solving the three-dimensional Navier-Stokes equations and the energy conservation equations. The velocity vector, temperature field distribution, and pressure field data at the corresponding locations are extracted from the full-field numerical solution.

[0015] Furthermore, the heat transfer field synergistic angle β The formula for calculating the three-dimensional spatial distribution is:

[0016] In the formula, For local fluid velocity vectors, This is the local temperature gradient vector. Let be the magnitude of the local temperature gradient vector; , , These are the velocity components of the local fluid velocity vector in the x, y, and z directions, respectively. , , These are the gradient components of the local temperature gradient vector in the x, y, and z directions, respectively.

[0017] Furthermore, the cooperative angle of the flow resistance field α The calculation formula is:

[0018] In the formula, For local fluid velocity vectors, This is the local velocity gradient vector. Let be the magnitude of the local velocity gradient vector; , , These are the velocity components of the local fluid velocity vector in the x, y, and z directions, respectively. , , These are the gradient components of the local velocity gradient vector in the x, y, and z directions, respectively.

[0019] Furthermore, on the 30° target surface corresponding to the upper rib, the average heat transfer field cooperative angle is... β Less than 86.4°, on the 45° target surface corresponding to the lower rib, the average flow resistance field cooperative angle is... α Greater than 19.3°.

[0020] Thirdly, the present invention provides a field-coordinated analysis system for an asymmetric staggered rib internal cooling structure, including a construction module, a data extraction module, and an analysis module; The building block is used to construct the geometric model of the aforementioned asymmetric staggered rib internal cooling structure; The data extraction module is used to extract three-dimensional velocity field, temperature field, and pressure field data under steady flow conditions within a rectangular channel; The analysis module is used to perform synergistic analysis of the heat transfer field, using the synergistic angle of the heat transfer field. β The degree of coordination between the velocity vector and the temperature gradient vector is quantified; simultaneously, a flow resistance field coordination analysis is performed, using the flow resistance field coordination angle. α The degree of coordination between the velocity vector and the velocity gradient vector is quantized.

[0021] Compared with the prior art, the present invention has at least the following significant beneficial effects: This invention proposes a 30°-45° asymmetric staggered rib internal cooling structure. Traditional symmetrical structures present a contradiction between improving heat transfer and reducing flow resistance. For example, while the 45°-45° symmetrical staggered rib structure has high heat transfer efficiency, it also has extremely high resistance, while the 30°-30° symmetrical staggered rib structure has low resistance but low heat transfer efficiency. The asymmetric structure utilizes the strong impact of the 45° ribs to induce violent secondary flow reversal to maintain high heat transfer capacity, while simultaneously using the 30° ribs to reduce the blockage effect within the flow channel. By employing asymmetric structural intervention, this invention reduces the overall flow pressure loss to a certain extent while maintaining a high heat transfer coefficient, exhibiting excellent comprehensive heat transfer performance.

[0022] Existing optimization methods largely rely on extensive empirical trial-and-error and fitting of macroscopic dimensionless parameters, lacking underlying theoretical guidance. This invention deeply integrates the field synergy principle into the design verification of staggered rib structures, extracting the flow resistance field synergy angle. α and the angle of cooperation of the heat transfer field βUsing intuitive spatial vector geometric angles, the degree of synergy between the velocity field, temperature gradient field, and velocity gradient field is quantified. This not only confirms the effectiveness of asymmetric design in reducing the synergy angle of the heat transfer field, but also demonstrates the effectiveness of asymmetric design in reducing the synergy angle of the heat transfer field. β (Enhanced heat transfer) and increased flow resistance field synergistic angle α Its absolute advantage in (resistance suppression) provides an intuitive and quantitative method for topology optimization of complex internal cooling channels in aero engines.

[0023] By adopting an asymmetric staggered rib structure, the turbulent and temperature fields induced by the intersection nodes are reshaped, and the low-turbulent kinetic energy fluid in the channel is further entrained and impacted against the channel sidewalls. Tests show that the local heat transfer intensity on the 30° target surface within the asymmetric channel even breaks through the original limit, surpassing the 30°-30° symmetric staggered rib structure. The asymmetric leap in heat transfer intensity improves the overall cooling uniformity of the internal cooling channel of the blade, effectively weakening the local hot spots that may be generated on the blade surface under extreme thermal loads, reducing the temperature gradient and thermal stress of the blade's metal matrix, and helping to extend the safe service life of high-performance gas turbine blades.

[0024] Furthermore, in the asymmetric staggered rib structure, the contact surfaces of the upper and lower ribs are tightly connected at the intersection nodes, and the upper and lower ribs are integrally formed with the rectangular channel wall; the solid connection matrix not only eliminates contact thermal resistance, but also constructs a more robust three-dimensional structure inside the turbine blade, enhancing the overall strength of the blade.

[0025] Furthermore, two adjacent ribs in the upper rib are arranged in parallel, and two adjacent ribs in the lower rib are arranged in parallel; the ribs of the upper and lower ribs have the same geometric dimensions, and the total height of the rectangular channel is set to twice the height of the staggered ribs; under this geometric constraint, the cooling fluid is forced to move along the parallelogram sub-channel network, and undergoes a violent flow direction deflection at the intersection of the upper and lower ribs and at the sidewalls of the channel.

[0026] Furthermore, the combination of 30° and 45° tilt angles is an optimized asymmetric configuration that allows the airflow to achieve lower flow resistance under the guidance of the upper rib at a 30° tilt angle, while generating stronger disturbance and heat transfer under the guidance of the lower rib at a 45° tilt angle. This achieves a trade-off between enhanced heat transfer and pressure loss control, avoiding the problems of insufficient heat transfer potential or excessive resistance caused by a single tilt angle in a symmetrical structure.

[0027] Furthermore, the field synergy analysis method starts from the underlying thermodynamic and fluid dynamic mechanisms, and calculates the synergy angle of the heat transfer field. β Cooperative angle of flow resistance field αIt can quantitatively reveal how asymmetric staggered rib structures achieve optimal matching of heat transfer enhancement and flow resistance by changing the velocity field and temperature gradient, and the spatial angle between the velocity gradient. This provides a theoretical basis and numerical guidance for structural optimization, avoiding the limitations of traditional designs based solely on experience or trial and error.

[0028] Furthermore, by employing a low Reynolds number grid with a near-wall viscous sublayer, the drastic changes in velocity and temperature gradients near the wall can be accurately captured, ensuring the accuracy of the numerical simulation results. Based on this, solving the Navier-Stokes equations and the energy conservation equations can yield high-fidelity three-dimensional flow and temperature field data, making subsequent field coordination angle calculations reliable.

[0029] Furthermore, the present invention provides a heat transfer field cooperative angle. β The standard calculation method directly quantifies the degree of coordination between the local flow field and the temperature field by using the ratio of the dot product of the velocity vector and the temperature gradient vector to the magnitude; the introduction of components in each direction of three-dimensional space makes... β It can reflect the combined effects of flow and temperature in the x, y, and z directions, and can comprehensively evaluate the heat transfer performance of complex three-dimensional flow within asymmetric interlaced ribs.

[0030] Furthermore, the present invention provides a flow resistance field cooperative angle. α The standard calculation method quantifies the spatial angle relationship between the velocity field and the velocity gradient in local flow by using the ratio of the dot product of the velocity vector and the velocity gradient vector to the magnitude. This index can reveal the intrinsic mechanism of flow resistance generation in asymmetric staggered rib structures and provide optimization directions for reducing pressure loss.

[0031] Furthermore, on the upper 30° target surface β A value less than 86.4° indicates good heat transfer field synergy in this region, and the asymmetric design enhances the heat transfer intensity of the 30° target surface; the lower 45° target surface... α The flow resistance is lower in the region greater than 19.3°. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of an asymmetric interlaced rib three-dimensional structure.

[0033] Figure 2 for Figure 1 Diagram of the intersection node and the flipped area.

[0034] Figure 3 for Figure 1 Schematic diagram of the height dimensions of the central channel and the intersecting ribs.

[0035] Figure 4 for Figure 1 Schematic diagram of the width of the central rib and the spacing between ribs.

[0036] Figure 5 This is a schematic diagram of asymmetrical interlaced ribs.

[0037] Figure 6 This is a schematic diagram of symmetrical staggered ribs at 30°-30°.

[0038] Figure 7 This is a schematic diagram of symmetrical staggered ribs at 45°-45°.

[0039] Figure 8 A 30°-30° symmetrical structure with a 30° target surface β Angular distribution cloud map.

[0040] Figure 9 A 30°-45° asymmetric structure with a 30° target surface. β Angular distribution cloud map.

[0041] Figure 10 A 45°-45° symmetrical structure with a 45° target surface α Angular distribution cloud map.

[0042] Figure 11 A 45° target surface with an asymmetric structure of 30°-45°. α Angular distribution cloud map.

[0043] Figure 12 This is a diagram showing the distribution of the synergistic angle of the target surface at 30°.

[0044] Figure 13 This is a diagram showing the distribution of the synergistic angle of the target surface at 45°.

[0045] In the attached diagram: 1-Asymmetric staggered rib structure, 2-Sub-channel, 3-Intersecting node, 4-Flipped area. Detailed Implementation

[0046] 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 some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "one side," "one end," and "one side," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0048] This embodiment provides an asymmetric staggered rib internal cooling structure for internal cooling of turbine blades in aero-engines. In modern high thrust-to-weight ratio aero-engines, the turbine inlet temperature far exceeds the melting point of the blade metal, thus requiring efficient internal cooling technology to extend its service life. Traditional symmetrical staggered rib structures (such as 30°-30° or 45°-45°) struggle to balance high heat transfer coefficients with low flow resistance. (Refer to...) Figure 6 and Figure 7 This embodiment resolves this contradiction geometrically by introducing an asymmetric staggered rib structure 1.

[0049] refer to Figure 1 and Figure 5 The physical model of this embodiment is based on a rectangular channel simulating the internal cooling passage of a turbine blade. Upper and lower ribs are respectively arranged on the two walls of the rectangular channel. The upper and lower ribs overlap spatially, dividing the rectangular channel into a series of interwoven and closely arranged sub-channels 2. The upper and lower ribs have different angles relative to the mainstream gas direction, forming an asymmetric staggered rib structure 1. The upper ribs are attached to the upper wall and include multiple parallel straight rectangular cross-section ribs. The angle between the upper ribs and the mainstream gas direction is the upper rib angle. γ The angle is strictly set at 30°. The lower ribs are attached to the lower wall surface and consist of multiple parallel rectangular cross-section ribs. The angle between the lower ribs and the mainstream gas flow direction is the lower rib angle. θThe angle is set to 45°; the upper and lower ribs form an asymmetric staggered rib structure 1 with a combination of 30°-45°. The rectangular channel is divided into densely interwoven sub-channels 2, expanding the effective convective heat transfer area; at the same time, the asymmetric design breaks the velocity and temperature field distribution law of the symmetrical structure, which can induce the airflow to generate more complex rotation, impact and overturning in the sub-channels 2, enhance the mixing of hot and cold fluids, improve heat transfer efficiency, and may reduce flow resistance by optimizing the angle combination.

[0050] In a preferred embodiment, the rib width is 0.6 mm and the staggered rib height is... h The spacing between the staggered ribs is 1.5mm. i The height is 1mm. The total height of the rectangular channel, i.e., the total height H of the staggered ribs, is set to twice the staggered rib height, which is 3mm, for reference. Figure 3 and Figure 4 Under this geometric constraint, the fluid cannot maintain a straight unidirectional flow within the rectangular channel, but is forced to meander along sub-channel 2, which is formed by interlacing 30° and 45° angles.

[0051] In the asymmetric staggered ribs, the 45° rib has a larger windward angle, resulting in a larger flow obstruction cross-sectional area for the fluid. This induces more intense and larger-scale fluid turbulence and impact. (Refer to 4 for turbulence region.) Figure 2 This results in an extremely high local heat transfer coefficient for the 45° target surface corresponding to the lower fins. Nu (Numerical representation). In a traditional 45°-45° symmetrical structure, such a drastic simultaneous flipping of the upper and lower ribs would lead to an extremely strong mainstream blockage effect, resulting in a high coefficient of friction. f The pressure will increase exponentially, causing unacceptable pressure loss. The ingenuity of this invention lies in the introduction of a 30° upper fin. The 30° upper fin angle is relatively gentle, resulting in a smaller obstruction area for the fluid. When the lower fin generates extremely high stagnation pressure, the upper fin is relatively in a low-pressure state. This asymmetrical structure creates a pressure gradient between the upper and lower fins, allowing some of the congested airflow to flow away from the low-resistance upper fin layer. The high-pressure fluid accumulated in the lower fin, after overturning on the channel sidewall, is rapidly discharged along the sub-channel 2 of the upper fin, reducing the high flow resistance caused by fluid stagnation. Based on this asymmetrical staggered fin structure, the lower fin maintains a high lower limit for heat transfer, while the upper fin effectively reduces flow resistance. (Refer to...) Figure 8 , Figure 9 , Figure 10 and Figure 11 .

[0052] In the asymmetric staggered rib structure 1, the contact surfaces of the upper and lower ribs are tightly connected at the intersection node 3. The upper and lower ribs are integrally formed with the rectangular channel wall, which can eliminate contact thermal resistance.

[0053] This invention provides a field synergy analysis method for an asymmetric staggered rib internal cooling structure, specifically including the following steps: Extract three-dimensional velocity, temperature, and pressure field data under steady-state flow conditions within a rectangular channel; Perform heat transfer field synergy analysis, using the heat transfer field synergy angle β The degree of coordination between the velocity vector and the temperature gradient vector is quantized. Perform flow resistance field cooperative analysis, using the flow resistance field cooperative angle. α The degree of coordination between the velocity vector and the velocity gradient vector is quantized.

[0054] The steps for extracting the three-dimensional velocity field, temperature field, and pressure field data specifically include: A near-wall mesh is constructed based on a geometric model of a rectangular channel, wherein the near-wall mesh is a low Reynolds number mesh that can completely resolve the near-wall viscous layer, and the first layer mesh has a dimensionless wall distance y+ < 1. Based on the near-wall mesh, the full-field numerical solution of the steady flow state in the rectangular channel is obtained by numerically solving the three-dimensional Navier-Stokes equations and the energy conservation equations. The velocity vector, temperature field distribution, and pressure field data at the corresponding locations are extracted from the full-field numerical solution.

[0055] This invention utilizes the principle of field synergy to transform complex partial differential equations into vector geometric angle analysis. The essence of convective heat transfer lies not only in the absolute magnitude of fluid velocity and temperature difference, but also in the degree of synergy between the velocity vector field and the temperature gradient vector field. This is achieved by extracting the local velocity vector of each grid node. and local temperature gradient vector Afterwards, the heat transfer field synergistic angle β The three-dimensional spatial distribution is calculated strictly according to the following formula:

[0056] In the formula, For local fluid velocity vectors, This is the local temperature gradient vector. Let be the magnitude of the local temperature gradient vector; , , The local fluid velocity vectors are respectively in x , y , z velocity components in the direction, , , The local temperature gradient vectors are respectively in x , y , z The gradient component in the direction.

[0057] Heat transfer field synergistic angle β The smaller the value, the closer the local velocity vector and the local temperature gradient vector are to being parallel (collinear), resulting in better field cooperation and stronger convective heat transfer. Global statistical analysis revealed that in the 30°-45° asymmetric structure of this invention, the average heat transfer field cooperation angle of the 30° target surface is... β The value is 86.2°, which is less than the 86.4° of the 30°-30° symmetrical structure, proving that the asymmetric design improves the heat transfer intensity of the 30° target surface.

[0058] If only pursuing the smallest β Angles (e.g., using 90° straight rib baffles) often lead to unbearable pressure losses. Therefore, this invention simultaneously proposes a combined analysis of flow resistance field. This involves extracting local velocity vectors from the flow field. and local velocity gradient vector Define the cooperative angle of the flow resistance field. α To quantify the degree of cooperation between the local velocity vector and the velocity gradient vector, the calculation formula is defined as follows:

[0059] In the formula, This is the local velocity gradient vector. Let be the magnitude of the local velocity gradient vector.

[0060] In flow resistance field analysis, the logic is exactly the opposite of that in heat transfer field. When the local velocity vector... The angle between the velocity gradient vector and the velocity gradient vector When the angle approaches 90°, the dot product of the two (i.e., cos...) α The velocity approaches zero. Physically, this indicates a strong orthogonality between the two, where momentum exchange along the mainstream direction is effectively attenuated, minimizing pressure loss due to turbulent viscous dissipation. Conversely, a smaller velocity approaches zero. α Angles represent strong flow resistance field cooperation, resulting in greater flow losses.

[0061] The results show that the average flow resistance cooperative angle of the asymmetric 30°-45° structure at the 45° target surface is... α The value is 20.1°, which is greater than the 19.3° average flow resistance cooperation angle α of a 45°-45° symmetrical structure. (Average flow resistance cooperation angle) α The significant increase in synergy weakens the asymmetric structure, which theoretically explains how the structure can maintain extremely high local heat transfer while reducing the overall flow resistance of the system by utilizing the flow channels formed by the 30° fins.

[0062] In summary, this invention integrates the field synergy principle into the design verification of the staggered rib structure, and proves the advantages of asymmetric design in balancing high heat transfer and low resistance loss from the perspective of energy and momentum conservation. It has industrial application value and theoretical guiding significance.

[0063] The heat transfer enhancement mechanism of the staggered rib structure is mainly concentrated in the fluid turning zone of the channel sidewall. When the cooling airflow flows in sub-channel 2, it is guided by the inclination angle of the asymmetric ribs. The fluid impacts the windward side of the ribs and generates a stagnation effect, converting kinetic energy into pressure energy and severely disrupting the thermal boundary layer. The fluid then tumbles on the sidewall, generating strong secondary flow and turbulent disturbances, causing deep mixing of the cold fluid in the channel core and the hot fluid near the wall. In the 30°-45° asymmetric rib structure, the 45° ribs induce more intense fluid tumbling and impact, resulting in an extremely high heat transfer coefficient for the 45° target surface; while the smaller inclination angle of the 30° ribs reduces the resistance to airflow, effectively mitigating the huge pressure loss caused by airflow stagnation. Figure 12 and Figure 13 .

[0064] The present invention can also provide a field-coordinated analysis system for an asymmetric staggered rib internal cooling structure, including a construction module, a data extraction module, and an analysis module; The building block is used to construct the geometric model of the aforementioned asymmetric staggered rib internal cooling structure; The data extraction module is used to extract three-dimensional velocity field, temperature field, and pressure field data under steady flow conditions within a rectangular channel; The analysis module is used to perform synergistic analysis of the heat transfer field, using the synergistic angle of the heat transfer field. β The degree of coordination between the velocity vector and the temperature gradient vector is quantified; simultaneously, a flow resistance field coordination analysis is performed, using the flow resistance field coordination angle. α The degree of coordination between the velocity vector and the velocity gradient vector is quantized.

[0065] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection described in the claims.

Claims

1. An asymmetric staggered rib internal cooling structure, characterized in that, It includes a rectangular channel, with upper and lower ribs respectively provided on the two walls inside the rectangular channel; the upper and lower ribs overlap each other in space, dividing the rectangular channel into a series of interwoven and closely arranged sub-channels (2); the upper and lower ribs have different inclination angles with the main direction, forming an asymmetrical interlaced rib structure (1).

2. The asymmetric staggered rib internal cooling structure according to claim 1, characterized in that, upper rib angle γ Set to 30°, lower rib angle θ Set to 45°, forming an asymmetric staggered rib structure with a combination of 30°-45° (1).

3. The asymmetric staggered rib internal cooling structure according to claim 1, characterized in that, In the asymmetric staggered rib structure (1), the contact surfaces of the upper rib and the lower rib are tightly connected at the intersection node (3), and the upper rib and the lower rib are integrally formed with the rectangular channel wall.

4. The asymmetric staggered rib internal cooling structure according to claim 1, characterized in that, The upper rib has two adjacent ribs arranged in parallel, and the lower rib has two adjacent ribs arranged in parallel; the upper and lower ribs have the same geometric dimensions, and the total height of the rectangular channel is set to twice the height of the staggered ribs.

5. The field synergy analysis method for an asymmetric staggered rib internal cooling structure as described in any one of claims 1-4, characterized in that, Specifically, the following steps are included: Extract three-dimensional velocity, temperature, and pressure field data under steady-state flow conditions within a rectangular channel; Perform heat transfer field synergy analysis, using heat transfer field synergy angles. β The degree of coordination between the velocity vector and the temperature gradient vector is quantized. Perform flow resistance field cooperative analysis, using the flow resistance field cooperative angle. α The degree of coordination between the velocity vector and the velocity gradient vector is quantized.

6. The field synergy analysis method according to claim 5, characterized in that, Extracting the three-dimensional velocity, temperature, and pressure field data under steady-state flow conditions within a rectangular channel specifically includes: A near-wall mesh is constructed based on a geometric model of a rectangular channel, wherein the near-wall mesh is a low Reynolds number mesh that can completely resolve the near-wall viscous layer, and the first layer mesh has a dimensionless wall distance y+ < 1. Based on the near-wall mesh, the full-field numerical solution of the steady flow state in the rectangular channel is obtained by numerically solving the three-dimensional Navier-Stokes equations and the energy conservation equations. Extract the velocity vector, temperature field distribution, and pressure field data at the corresponding locations from the full-field numerical solution.

7. The field synergy analysis method according to claim 5, characterized in that, Heat transfer field cooperative angle β The formula for calculating the three-dimensional spatial distribution is: In the formula, For local fluid velocity vectors, This is the local temperature gradient vector. Let be the magnitude of the local temperature gradient vector; , , These are the velocity components of the local fluid velocity vector in the x, y, and z directions, respectively. , , These are the gradient components of the local temperature gradient vector in the x, y, and z directions, respectively.

8. The field synergy analysis method according to claim 5, characterized in that, Flow resistance field cooperative angle α The calculation formula is: In the formula, For local fluid velocity vectors, This is the local velocity gradient vector. Let be the magnitude of the local velocity gradient vector; , , These are the velocity components of the local fluid velocity vector in the x, y, and z directions, respectively. , , These are the gradient components of the local velocity gradient vector in the x, y, and z directions, respectively.

9. The field synergy analysis method according to claim 5, characterized in that, On the target surface corresponding to the upper rib at 30°, the average heat transfer field cooperative angle β Less than 86.4°, on the 45° target surface corresponding to the lower rib, the average flow resistance field cooperative angle is... α Greater than 19.3°.

10. A field-coordinated analysis system for an asymmetric staggered rib internal cooling structure, characterized in that, It includes a construction module, a data extraction module, and an analysis module; The building module is used to construct the geometric model of the asymmetric staggered rib internal cooling structure as described in any one of claims 1-4; The data extraction module is used to extract three-dimensional velocity field, temperature field, and pressure field data under steady flow conditions within a rectangular channel; The analysis module is used to perform heat transfer field synergy analysis and define the heat transfer field synergy angle. β To quantify the degree of cooperation between the velocity vector and the temperature gradient vector; simultaneously, to perform flow resistance field cooperation analysis and define the flow resistance field cooperation angle. α This is used to quantify the degree of coordination between the velocity vector and the velocity gradient vector.

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