Vein-imitated liquid cooling plate flow channel and design method thereof

Abstract

The invention relates to a honeycomb-like liquid cooling plate flow channel and a design method thereof, belongs to the technical field of electronic heat dissipation of aircrafts, and solves the problems of large occupied space and large flow resistance of existing heat source equipment. A vein-imitating liquid cooling plate flow channel is arranged in a rectangular liquid cooling plate and comprises a vein-imitating flow channel net, a main flow channel, a collecting flow channel, a flow channel inlet and a flow channel outlet. The flow channel inlet and the flow channel outlet are symmetrically formed in the centers of the left side edge and the right side edge of the liquid cooling plate respectively, and the flow channel inlet is formed in the center of the right side edge of the liquid cooling plate and communicates with the main flow channel; the runner outlet is formed in the center of the left side plate of the liquid cooling plate and communicated with the converging runner; the main flow channel is arranged in the middle of the rectangular liquid cooling plate and is communicated with the flow channel network forming the vein shape; the whole vein-shaped flow channel net is formed by arranging N fold-line-shaped micro-flow channel units, and the N fold-line-shaped micro-flow channel units are vertically and symmetrically distributed on the two sides of the main flow channel. The vein-imitated liquid cooling plate runner is applied to heat source equipment, and is small in space and low in flow resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic heat dissipation of aircraft, and particularly to a honeycomb-like liquid cooling plate flow channel and a design method thereof. Background Art

[0002] With the continuous improvement of the working efficiency of modern aircraft, the electronic devices inside the aircraft, such as navigation systems and control systems, are facing more severe working conditions. First, the continuous improvement of working performance (such as detection range, resolution, etc.) makes the power consumption of the devices continue to increase; second, the design of the aircraft platform tends to be lightweight and miniaturized, resulting in higher device integration and further increase in heat flux density; third, with the increase of the flight time of the aircraft, the electronic devices face longer working hours. In summary, the aircraft platform is facing the severe challenges of high power consumption, long working hours, and high heat flux density.

[0003] The existing heat control measures for aircraft platforms generally use two types of technologies. One is the passive cooling measure based on phase change materials, and its disadvantage is that this passive consumable cold source can only support the device to work for a limited time; the other is the use of compression refrigeration method, and its disadvantage is that it consumes a huge amount of electric energy and has a large volume and mass itself.

[0004] Therefore, it is of great significance to design a heat source device that can be applied to the heat dissipation system of the aircraft platform, which can meet the requirements of small space occupied by the aircraft platform of the heat dissipation system, long continuous working time, small flow resistance under high heat flux density, and large heat dissipation area under the conditions of high heat transfer and low flow resistance. Summary of the Invention

[0005] In view of the above analysis, an embodiment of the present invention aims to provide a vein-like liquid cooling plate flow channel and a design method thereof, so as to solve the problems that the heat source device of the heat dissipation system occupies a relatively large space and has a large flow resistance when the existing aircraft platform works under high power, long working hours, and high heat flux density.

[0006] The object of the present invention is mainly achieved through the following technical solutions:

[0007] On the one hand, the present invention provides a vein-like liquid cooling plate flow channel, which is arranged in a rectangular liquid cooling plate and includes a vein-like flow channel network, a main flow channel, a converging flow channel, a flow channel inlet and a flow channel outlet;

[0008] The flow channel inlet and the flow channel outlet are symmetrically arranged at the centers of the left and right sides of the liquid cooling plate respectively. Among them, the flow channel inlet is arranged at the center of the right side of the liquid cooling plate and is communicated with the main flow channel; the flow channel outlet is arranged at the center of the left side of the liquid cooling plate and is communicated with the converging flow channel;

[0009] The main runner is arranged at the middle position of the rectangular liquid cooling plate and is communicated with the runner network in the shape of leaf veins; the whole runner network in the shape of leaf veins is composed of N micro-channel units arranged in a broken line shape and is symmetrically distributed up and down on both sides of the main runner.

[0010] Further, the micro-channel unit in the shape of a broken line includes a straight channel parallel to each other and an inclined channel parallel to each other. The outlet ends of the straight channels are flush and are connected to the converging channel.

[0011] Further, the micro-channel units in the shape of a broken line on the same side of the main runner are parallel to each other.

[0012] Further, the included angle ɑ between the main runner and the inclined channels of the micro-channel units in the shape of a broken line on the same side of the main runner satisfies 30°≤ɑ≤60°.

[0013] Further, the cross-section of the channel in the micro-channel unit in the shape of a broken line, facing the channel inlet direction, is rectangular and satisfies:

[0014] 1.5*W≤K≤3*W;

[0015] wherein, W is the channel width in the micro-channel unit in the shape of a broken line, in mm;

[0016] K is the channel spacing in the micro-channel unit in the shape of a broken line, in mm.

[0017] Further, the width of the main runner, the width of the converging channel, and the equivalent diameters of the channel inlet and the channel outlet are equal and satisfy:

[0018] W1 = W2 = D≥N*W;

[0019] wherein, W1 is the width of the main runner, in mm;

[0020] W2 is the width of the converging channel, in mm;

[0021] D is the equivalent diameter of the channel inlet and the channel outlet, in mm;

[0022] W is the channel width in the micro-channel unit in the shape of a broken line, in mm;

[0023] N is the number of micro-channel units in the shape of a broken line, in pieces.

[0024] Further, the length of the main runner is three times the width of the main runner.

[0025] On the other hand, the present invention also provides a design method for a leaf vein-shaped liquid cooling plate runner, which is used to design the above-mentioned leaf vein-shaped liquid cooling plate runner and includes the following steps:

[0026] S1: Obtain the actually available bottom plate of the rectangular liquid cooling plate;

[0027] S2: Design the preliminary shape and size of the leaf vein-like liquid cooling plate flow channel to obtain the size and shape of the target flow channel;

[0028] S3: According to the size and shape of the target flow channel, use the sketch tool of the modeling software to draw the basic shape and size of the flow channel on a plane;

[0029] S4: Use the feature tool of the modeling software to convert the sketch into a three-dimensional entity to obtain the first leaf vein-like liquid cooling plate flow channel model;

[0030] S5: Use the modeling software to extract the inner cavity model of the first leaf vein-like liquid cooling plate flow channel model, import it into the simulation software for mesh generation, boundary condition setting, working fluid property parameter and solution parameter setting, and perform the solution to obtain the flow resistance, flow rate and average temperature of the flow channel;

[0031] S6: Analyze the flow resistance, flow rate and average temperature of the flow channel obtained in step S5. According to the analysis results, optimize the structure of the first leaf vein-like liquid cooling plate flow channel model to obtain the second leaf vein-like liquid cooling plate flow channel model;

[0032] Perform simulation analysis on the flow resistance, flow rate and average temperature of the second leaf vein-like liquid cooling plate flow channel model. According to the simulation analysis results of the second leaf vein-like liquid cooling plate flow channel model and the first leaf vein-like liquid cooling plate flow channel model, judge whether the simulation analysis results meet the stop iteration condition. If so, determine the second leaf vein-like liquid cooling plate flow channel model as the final liquid cooling plate flow channel model. If not, optimize the structure of the second leaf vein-like liquid cooling plate flow channel model;

[0033] Repeat the simulation analysis until the Nth leaf vein-like liquid cooling plate flow channel model obtained after N iterations meets the stop iteration condition, which is the final leaf vein-like liquid cooling plate flow channel model.

[0034] Further, the scale of the mesh is 0.01 times the diameter of the flow channel inlet.

[0035] Further, in step S6, the stop iteration condition is: the flow resistance of the (N - 1)th leaf vein-like liquid cooling plate flow channel model is P N-1 , and the flow resistance of the Nth leaf vein-like liquid cooling plate flow channel model is P N , when abs(P N - P N-1 ) / P N-1 ≤ 0.01, stop the iteration to obtain the final leaf vein-like liquid cooling plate flow channel model.

[0036] Compared with the prior art, the present invention can at least achieve one of the following beneficial effects:

[0037] 1. The liquid cooling plate flow channel of the present invention is in a vein-like shape as a whole, and includes a vein-like flow channel network, a main flow channel, a converging flow channel, a flow channel inlet and a flow channel outlet; the main flow channel is connected to the flow channel network forming the vein-like shape, and is indirectly connected to the converging flow channel through the vein-like flow channel network; the vein-like flow channel network is composed of N micro-channel units arranged in a broken line shape, symmetrically distributed up and down on both sides of the main flow channel, and covering the entire liquid cooling plate; applying this vein-like liquid cooling plate flow channel to the liquid cooling plate inside the aircraft as a heat source device, it can maintain the continuous operation of the electronic device for more than 2 hours with a relatively small occupation of the space in the aircraft platform cabin.

[0038] 2. When the vein-like liquid cooling plate flow channel of the present invention is applied to a heating device with a heat flux density of 50 W / cm 2 in the aircraft platform, it has a relatively small flow resistance and a relatively large heat exchange area.

[0039] 3. The vein-like liquid cooling plate flow channel of the present invention is applied to the liquid cooling plate inside the aircraft and is suitable for the harsh working conditions of low air pressure, high acceleration, and large-scale shock vibration in the aircraft platform.

[0040] 4. The vein-like liquid cooling plate flow channel of the present invention is applied to the liquid cooling plate inside the aircraft. By means of a circulation pipeline, the heat generated by the electronic device is transported to the cold source device, realizing the application requirements of the heat source device in the aircraft cooling system with a small occupation of the aircraft platform space, a long continuous working time, a small flow resistance under a high heat flux density, and a large heat dissipation area; when the vein-like liquid cooling plate flow channel of the present invention is applied to the aircraft heat source device, the flow resistance ≤ 500 Pa, and the highest temperature of the heat source ≤ 110 °C.

[0041] In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present invention will be described in the subsequent specification, and some advantages can be made obvious from the specification or understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the content specifically pointed out in the specification and the drawings. Description of the Drawings

[0042] The drawings are only for the purpose of showing specific embodiments and are not considered to be a limitation of the present invention. Throughout the drawings, the same reference signs represent the same components.

[0043] Figure 1 It is a schematic diagram of the vein-like liquid cooling plate flow channel of Embodiment 1 of the present invention;

[0044] Figure 2 It is a pressure contour map of the vein-like liquid cooling plate flow channel of Embodiment 1 of the present invention;

[0045] Figure 3 It is a temperature contour map of the vein-like liquid cooling plate flow channel of Embodiment 1 of the present invention;

[0046] Figure 4 This is the structural diagram of the ground verification system in Embodiment 1 of the present invention.

[0047] Reference numerals: 1 - runner inlet; 2 - runner outlet; 3 - main runner; 4 - converging runner; 5 - vein-like runner network; 6 - straight runner in the zigzag-shaped micro-channel unit; 7 - inclined runner in the zigzag-shaped micro-channel unit; A - A - cross-section direction; W - rectangular width of the runner cross-section in the A - A direction; H - rectangular height of the runner cross-section in the A - A direction; K - runner spacing of the zigzag-shaped micro-channel unit; ɑ - angle between the main runner and the zigzag-shaped micro-channel unit on the same side of the main runner; β - conical angle of the end wall of the main runner. Detailed implementation manners

[0048] The preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. The accompanying drawings form a part of this application and are used together with the embodiments of the present invention to explain the principles of the present invention, rather than to limit the scope of the present invention.

[0049] The present invention provides a vein-like liquid cooling plate runner, which is arranged in a rectangular liquid cooling plate and includes a vein-like runner network, a main runner, a converging runner, a runner inlet and a runner outlet;

[0050] The runner inlet and the runner outlet are symmetrically arranged at the centers of the left and right side edges of the liquid cooling plate respectively. Among them, the runner inlet is arranged at the center of the right side edge of the liquid cooling plate and is communicated with the main runner; the runner outlet is arranged at the center of the left side plate of the liquid cooling plate and is communicated with the converging runner;

[0051] The main runner is arranged at the middle position of the rectangular liquid cooling plate and is communicated with the runner network in the shape of veins. The main runner is indirectly communicated with the converging runner through the runner network in the shape of veins; the entire runner network in the shape of veins is composed of N zigzag-shaped micro-channel units arranged and is symmetrically distributed above and below the main runner; among them, the zigzag-shaped micro-channel units on the same side of the main runner are separated from each other by partitions, and the zigzag-shaped micro-channel units on the same side of the main runner are parallel to each other;

[0052] The zigzag-shaped micro-channel unit includes an adjacent straight runner part and an inclined runner part. The straight runner parts are parallel to each other, the inclined runner parts are parallel to each other, and the outlet ends of the straight runner parts are flush and are connected to the converging runner at the outlet ends.

[0053] The angle ɑ between the main runner and the inclined runner part of the zigzag-shaped micro-channel unit on the same side of the main runner satisfies 30° ≤ ɑ ≤ 60°;

[0054] The main runner and the converging runner are perpendicular to each other, and the axis of the main runner coincides with the axes of the runner inlet and the runner outlet; the longitudinal section of the main runner is rectangular, and the transverse section of the converging runner is rectangular.

[0055] It should be noted that the length of the main runner is half of the distance between the runner inlet and the runner outlet, that is, along the direction from the runner inlet to the runner outlet, the main runner extends from the runner inlet to the center of the entire cold plate runner. Along the direction from the runner inlet to the runner outlet, the inclined runners of the micro-channel units in a zigzag shape are arranged in parallel in sequence and extend along the direction away from the main runner. The extension endpoints of the inclined runners arranged in parallel on the same side are collinear, and the angle ɑ between the extension endpoints and the axis of the cold plate runner, that is, the angle between the main runner and the inclined runner part of the micro-channel unit in a zigzag shape on the same side of the main runner, satisfies 30° ≤ ɑ ≤ 60°; the straight channel part of the micro-channel unit in a zigzag shape extends along the direction from the runner inlet to the runner outlet from the extension endpoint of the inclined runner.

[0056] Among them, along the direction from the runner inlet to the runner outlet, the end wall surface of the main runner is tapered, and the taper angle is β = 2ɑ. Such a structural design is conducive to the diversion of the main runner here, avoiding the generation of vortices and separated flows that cause an increase in flow resistance.

[0057] Preferably, N > 5; this vein-like flow channel network structure ensures that when the medium flows into the main runner from the runner inlet, it will not flow away quickly in one channel, but flow along the main runner to the left. During this period, the medium is successively distributed into the micro-channel units in a zigzag shape on both sides of the main runner. The medium entering the micro-channel units in a zigzag shape converges in the converging runner and then flows out from the runner outlet. When the entire runner is filled with the medium for a period of time, the fluid inflow and outflow reach equilibrium, and the medium in the liquid cooling plate fills the entire channel at any time and flows in each channel.

[0058] In the flow channels in the micro-channel units in a zigzag shape in the vein-like flow channel network, the cross-section facing the runner inlet direction is rectangular, the width of the flow channel is W, the height of the flow channel is H, and the flow channel spacing is K, satisfying 1.5*W ≤ K ≤ 3*W, in mm. Meeting this condition for the flow channel spacing can improve the heat dissipation effect of the liquid cooling plate and make the convective heat transfer amount and heat conduction amount of the liquid cooling plate balanced.

[0059] The width of the main runner is W1, the length is L1, the width of the converging runner is W2, the length is L2, and the equivalent diameter of the runner inlet and the runner outlet is D, satisfying W1 = W2 = D ≥ N*W, L2 = N*W + (N - 1)*K, and L1 is half of the distance between the runner inlet and the runner outlet; meeting this condition for the dimensions of the main runner and the converging runner and the equivalent diameter of the runner inlet and the runner outlet can ensure sufficient flow supply at the runner inlet and outlet and balanced flow distribution in the vein-like flow channel network.

[0060] The present invention also provides a design method for a vein - like liquid - cooled plate flow channel for manufacturing the above - mentioned vein - like liquid - cooled plate flow channel, including the following steps:

[0061] S1: Obtain an actually available rectangular liquid - cooled plate bottom plate;

[0062] S2: Design the preliminary shape and size of the vein - like liquid - cooled plate flow channel to obtain the size and shape of the target flow channel;

[0063] S3: According to the size and shape of the target flow channel, use the sketch tool of the modeling software to draw the basic shape and size of the flow channel on a plane;

[0064] S4: Use the feature tool of the modeling software to convert the sketch into a three - dimensional entity to obtain the first vein - like liquid - cooled plate flow channel model;

[0065] S5: Use the modeling software to extract the inner cavity model of the first vein - like liquid - cooled plate flow channel model, import it into the simulation software for mesh generation, boundary condition setting, working fluid property parameter and solution parameter setting, and perform a solution to obtain the flow resistance of the flow channel, the flow rate of the flow channel and the average temperature;

[0066] S6: Analyze the flow resistance of the flow channel, the flow rate of the flow channel and the average temperature obtained in step S5. According to the analysis results, optimize the structure of the first vein - like liquid - cooled plate flow channel model to obtain the second vein - like liquid - cooled plate flow channel model;

[0067] Perform a simulation analysis on the flow resistance of the flow channel, the flow rate of the flow channel and the average temperature of the second vein - like liquid - cooled plate flow channel model. According to the simulation analysis results of the second vein - like liquid - cooled plate flow channel model and the first vein - like liquid - cooled plate flow channel model, determine whether the simulation analysis results meet the stop - iteration condition. If they meet, determine the second vein - like liquid - cooled plate flow channel model as the final liquid - cooled plate flow channel model. If they do not meet, optimize the structure of the second vein - like liquid - cooled plate flow channel model;

[0068] Repeat the simulation analysis until the Nth vein - like liquid - cooled plate flow channel model obtained after N iterations meets the stop - iteration condition, which is the final vein - like liquid - cooled plate flow channel model.

[0069] Specifically, in step S2, when designing the preliminary shape and size of the vein - like liquid - cooled plate flow channel to obtain the size and shape of the target flow channel, it includes the following steps:

[0070] S21: Set a flow channel inlet and a main flow channel at the middle position on the right side of the liquid - cooled plate bottom plate;

[0071] Specifically, the flow channel inlet and the main flow channel are connected. The longitudinal section of the main flow channel is rectangular. The equivalent diameter D of the flow channel inlet is equal to the width W1 of the main flow channel, and the length L1 of the main flow channel is three times the width W1 of the main flow channel.

[0072] S22: Set a flow channel outlet and a converging flow channel at the middle position on the left side of the bottom plate of the liquid cooling plate. The converging flow channel is perpendicular to the main flow channel;

[0073] Among them, the flow channel outlet and the converging flow channel are connected. The transverse cross-section of the converging flow channel is rectangular, and the equivalent radius D of the flow channel outlet is equal to the width W2 of the converging flow channel;

[0074] S23: Along the direction of the principle flow channel inlet, N mutually parallel micro-channel units in a zigzag shape are set step by step on the same side of the main flow channel. The micro-channel units in a zigzag shape are connected to the main flow channel, and the micro-channel units in a zigzag shape are separated from each other by partition plates;

[0075] Among them, the included angle ɑ between the main flow channel and the micro-channel units in a zigzag shape on the same side of the main flow channel satisfies 30° ≤ ɑ ≤ 60°;

[0076] The flow channel in the micro-channel unit in a zigzag shape has a rectangular cross-section facing the flow channel inlet direction, the flow channel width is W, the flow channel height is H, and the flow channel spacing is K, satisfying 1.5*W ≤ K ≤ 3*W, unit mm;

[0077] S24: Set N micro-channel units in a zigzag shape that are vertically symmetric with those in step S23 on the other side of the main flow channel step by step to form a vein-shaped flow channel network. The vein-shaped flow channel network is connected to the converging flow channel to obtain the size and shape of the target flow channel.

[0078] Specifically, in step S5, use modeling software to extract the inner cavity model of the first vein-like liquid cooling plate flow channel, import it into simulation software for mesh generation, and perform mesh independence analysis. The mesh scale is D / 100, which can balance the simulation efficiency and accuracy;

[0079] Then set the boundary conditions. The boundary conditions are: set velocity and temperature boundary conditions at the flow channel inlet position, the velocity value is 3.5 - 4 L / min, and the temperature value is 10 - 20 °C; set pressure boundary conditions at the flow channel outlet position, the pressure value is 0 - 0.1 MPa; set thermal boundary conditions on one surface of the liquid cooling plate, and the heat flux is 50 W / m 2 .

[0080] Set the physical property parameters of the working medium, including the density, specific heat capacity, and viscosity of the working medium;

[0081] The solution parameters are the number of calculation steps and the convergence residual. The number of calculation steps ≥ 500, and the convergence residual ≤ 1E-6; then perform simulation operation and solution to obtain the flow resistance of the flow channel and the flow rate of the medium flow channel.

[0082] Specifically, in step S6, the condition for stopping iteration is: the flow resistance of the (N - 1)th vein-like liquid cooling plate flow channel model is P N-1, the flow resistance of the Nth vein-like liquid cooling plate flow channel model is P N , when abs(P N -P N-1 ) / P N-1 ≤0.01, stop the iteration to obtain the final vein-like cavity liquid cooling plate flow channel model.

[0083] Specifically, in step S6, the structure optimization includes adjusting the width W1 of the main flow channel, the equivalent diameters D of the flow channel inlet and the flow channel outlet, and the width W2 of the converging flow channel to satisfy W1 = W2 = D ≥ N * W; and adjusting the length L2 of the converging flow channel to satisfy L2 = N * W + (N - 1) * K; and adjusting the flow channel spacing K in the zigzag-shaped micro flow channel unit to satisfy 1.5 * W ≤ K ≤ 3 * W until the obtained final vein-like liquid cooling plate flow channel model meets the condition for stopping the iteration.

[0084] The vein-like liquid cooling plate flow channel model of the present invention can be applied to heat source devices in the liquid cooling system of an aircraft. The liquid cooling plate, as a heat source device, is in direct contact with the heat-generating electronic device for heat conduction, and is cooled by the low-temperature fluid coming from the cold source system, so as to achieve the effect of cooling the heat-generating electronic device.

[0085] Embodiment 1

[0086] The vein-like liquid cooling plate flow channel of this embodiment is arranged in a rectangular liquid cooling plate, as Figure 1 shown, and includes a vein-like flow channel network, a main flow channel, a converging flow channel, a flow channel inlet and a flow channel outlet;

[0087] The flow channel inlet and the flow channel outlet are symmetrically arranged at the centers of the left and right side edges of the liquid cooling plate respectively. Among them, the flow channel inlet is arranged at the center of the right side edge of the liquid cooling plate and is connected to the main flow channel; the flow channel outlet is arranged at the center of the left side plate of the liquid cooling plate and is connected to the converging flow channel;

[0088] The main flow channel is arranged at the middle position of the rectangular liquid cooling plate and is connected to the flow channel network forming the vein shape. The main flow channel is indirectly connected to the converging flow channel through the vein-like flow channel network; the whole vein-like flow channel network is composed of 12 zigzag-shaped micro flow channel units arranged, symmetrically distributed up and down on both sides of the main flow channel, with 6 zigzag-shaped micro flow channel units on each side; among them, the zigzag-shaped micro flow channel units on the same side of the main flow channel are separated from each other by partitions, and the zigzag-shaped micro flow channel units on the same side of the main flow channel are parallel to each other;

[0089] The zigzag-shaped micro flow channel unit includes an adjacent straight flow channel part and an inclined flow channel part. The straight flow channel parts are parallel to each other, the inclined flow channel parts are parallel to each other, and the outlet ends of the straight flow channel parts are flush and are connected to the converging flow channel at the outlet end.

[0090] The included angle ɑ between the main runner and the inclined runner part of the micro-channel unit with a broken-line shape on the same side as the main runner is 50°;

[0091] The main runner and the converging runner are perpendicular to each other, and the axis of the main runner coincides with the axes of the runner inlet and the runner outlet. The longitudinal section of the main runner is rectangular, and the transverse section of the converging runner is rectangular.

[0092] It should be noted that the length of the main runner is half of the distance between the runner inlet and the runner outlet. That is, along the direction from the runner inlet to the runner outlet, the main runner extends from the runner inlet to the center of the entire cold plate runner. Along the direction from the runner inlet to the runner outlet, the inclined runners of the micro-channel unit with a broken-line shape are arranged in parallel in sequence, extending along the direction away from the main runner. The extension endpoints of the inclined runners arranged in parallel on the same side are collinear, and the included angle between them and the axis of the cold plate runner, that is, the included angle ɑ between the main runner and the inclined runner part of the micro-channel unit with a broken-line shape on the same side as the main runner, is 50°; the straight-channel part of the micro-channel unit with a broken-line shape extends along the direction from the runner inlet to the runner outlet from the extension endpoint of the inclined runner.

[0093] Among them, along the direction from the runner inlet to the runner outlet, the end wall surface of the main runner is tapered, and the taper angle is β = 2ɑ = 100°.

[0094] For the channels in the micro-channel unit with a broken-line shape in the vein-like flow channel network, the cross-section facing the runner inlet direction is rectangular, the channel width is W = 1mm, the channel height is H = 1mm, and the channel spacing is K = 3mm, satisfying 1.5*W ≤ K ≤ 3*W, with the unit of mm.

[0095] The width of the main runner is W1 = 12mm, the length is L1 = 36mm, the width of the converging runner is W2 = 12mm, the length L2 = 45mm, and the equivalent diameter D of the runner inlet and the runner outlet is 12mm, satisfying W1 = W2 = D ≥ N*W, L2 = N*W + (N - 1)*K.

[0096] The pressure contour map of the vein-like liquid cooling plate runner in this embodiment is as Figure 2 shown. It can be seen from the figure that the flow resistance obtained by the simulation calculation of the vein-like liquid cooling plate runner in this embodiment is 495.97 Pa.

[0097] The temperature contour map of the vein-like liquid cooling plate runner in this embodiment is as Figure 3 shown. It can be seen from the figure that the highest temperature of the heat source obtained by the simulation calculation of the vein-like liquid cooling plate runner in this embodiment is 101.67 °C.

[0098] Embodiment 2

[0099] The vein-like liquid cooling plate runner designed in Embodiment 1 is actually verified by the ground verification system.

[0100] The structure of the ground verification system is as Figure 4 shown. The verification system consists of a liquid storage tank, a flow meter, a gear pump, an analog thermal load, a heat dissipation skin, and sensors. The sensors are set at the inlet and outlet positions of the S-shaped single-strip series skin flow channel;

[0101] The verification conditions are as follows: a heat flux of 50 W / cm 2 is applied;

[0102] After actual verification by the ground verification system, the flow resistance obtained from the simulation calculation of the vein-like liquid cooling plate flow channel is 495.97 Pa, and the highest temperature of the heat source is 101.67 °C, showing a good cooling effect.

[0103] Example 3

[0104] This example is a design method for the vein-like liquid cooling plate flow channel of Example 1, including the following steps:

[0105] S1: Obtain an actually available rectangular liquid cooling plate bottom plate;

[0106] S2: Design the preliminary shape and size of the vein-like liquid cooling plate flow channel to obtain the size and shape of the target flow channel;

[0107] S21: Set a flow channel inlet and a main flow channel at the middle position on the right side of the liquid cooling plate bottom plate;

[0108] Specifically, the flow channel inlet and the main flow channel are connected. The longitudinal cross-section of the main flow channel is rectangular. The equivalent diameter D of the flow channel inlet is equal to the width W1 of the main flow channel, D = W1 = 10 mm, and the length L1 of the main flow channel is 36 mm.

[0109] S22: Set a flow channel outlet and a converging flow channel at the middle position on the left side of the liquid cooling plate bottom plate. The converging flow channel is perpendicular to the main flow channel;

[0110] Among them, the flow channel outlet and the converging flow channel are connected. The transverse cross-section of the converging flow channel is rectangular. The equivalent radius D of the flow channel outlet is equal to the width W2 of the converging flow channel, both being 10 mm;

[0111] S23: Along the direction of the principle flow channel inlet, successively set 6 micro-channel units with a zigzag shape on the same side of the main flow channel. The zigzag micro-channel units are connected to the main flow channel, and the zigzag micro-channel units are separated from each other by partitions;

[0112] Among them, the included angle ɑ between the main flow channel and the zigzag micro-channel units on the same side of the main flow channel is 50°;

[0113] The flow channel in the microchannel unit with a zigzag shape has a rectangular cross-section towards the flow channel inlet. The flow channel width is W = 1 mm, the flow channel height is H = 1 mm, and the flow channel spacing is K = 3 mm, satisfying 1.5 * W ≤ K ≤ 3 * W, with the unit of mm;

[0114] S24: On the other side of the main flow channel, gradually arrange 6 zigzag-shaped microchannel units that are symmetric up and down with those in step S23 to form a vein-shaped flow channel network. The vein-shaped flow channel network is connected to the converging flow channel to obtain the size and shape of the target flow channel.

[0115] S3: According to the size and shape of the target flow channel, use the sketch tool of the modeling software to draw the basic shape and size of the flow channel on the plane;

[0116] S4: Use the feature tool of the modeling software to convert the sketch into a three-dimensional solid to obtain the first vein-shaped liquid cooling plate flow channel model;

[0117] S5: Use the modeling software to extract the inner cavity model of the first vein-shaped liquid cooling plate flow channel model, import it into the simulation software for mesh generation, boundary condition setting, working fluid physical property parameter and solution parameter setting, and perform the solution to obtain the flow channel resistance, flow channel flow rate, and average temperature;

[0118] Among them, the mesh scale is D / 100, which can balance the simulation efficiency and accuracy;

[0119] The boundary conditions are as follows: Set the velocity and temperature boundary conditions at the flow channel inlet position, with the velocity value being 3.5 L / min and the temperature value being 10 °C; Set the pressure boundary condition at the flow channel outlet position, with the pressure value being 0.1 MPa; Set the heat boundary condition on one surface of the liquid cooling plate, with the heat flux being 50 W / m 2 .

[0120] Set the working fluid physical property parameters: The medium is 65% ethylene glycol solution, with a density of 1069.145 kg / m 3 , specific heat capacity of 3.165 kJ / kg*K, and viscosity of 1.91 mPa*s.

[0121] The solution parameters are the number of calculation steps and the convergence residual. The number of calculation steps is 500 steps, and the convergence residual is 1E-6.

[0122] S6: Analyze the flow channel resistance, flow channel flow rate, and average temperature of the first vein-shaped liquid cooling plate flow channel model obtained in step S5. According to the analysis results, optimize the structure of the first honeycomb-shaped liquid cooling plate flow channel model, adjust the equivalent radius D = 12 mm of the flow channel outlet and the flow channel inlet, widen the main flow channel width W1 = 12 mm, widen the converging flow channel width W2 = 12 mm, and adjust the converging flow channel length L2 = 45 mm to obtain the second vein-shaped liquid cooling plate flow channel model;

[0123] The flow resistance of the second leaf vein-like liquid cooling plate flow channel model is simulated and analyzed. Among them, the flow resistance of the second leaf vein-like liquid cooling plate flow channel model is P2 = 495.97 Pa, and that of the first leaf vein-like liquid cooling plate flow channel model is P1 = 495.965 Pa, satisfying abs(P N -P N-1 ) / P N-1 ≤ 0.01, stop iteration, and the second leaf vein-like liquid cooling plate flow channel model is the final leaf vein-like liquid cooling plate flow channel model.

[0124] Comparative Example 1

[0125] The leaf vein-like liquid cooling plate flow channel in this comparative example has the same shape as that in Example 1, except for some dimensions of the leaf vein-like liquid cooling plate flow channel. The differences are as follows:

[0126] The included angle ɑ between the main flow channel and the micro flow channel unit with a broken line shape on the same side of the main flow channel is 80°;

[0127] The flow channel in the micro flow channel unit with a broken line shape has a rectangular cross-section facing the flow channel inlet direction, the flow channel width is W = 1 mm, the flow channel height is H = 1 mm, and the flow channel spacing is K = 1 mm, not satisfying 1.5 * W ≤ K ≤ 3 * W, unit mm;

[0128] The width of the main flow channel is W1 = 10 mm, the length is L1 = 30 mm, the width of the converging flow channel is W2 = 10 mm, the length L2 = 23 mm, and the equivalent diameters of the flow channel inlet and the flow channel outlet are D = 10 mm, not satisfying W1 = W2 = D ≥ N * W.

[0129] The leaf vein-like liquid cooling plate flow channels of Example 1 and Comparative Example 1 are applied to the heat source equipment in the aircraft liquid cooling system. After actual verification by the ground verification system, the flow resistance of the leaf vein-like liquid cooling plate flow channel of Example 1 is 495.97 Pa, and the highest temperature of the heat source is 101.67 °C; the flow resistance of the S-shaped broken line single-strip series liquid cooling plate flow channel of Comparative Example 1 is 895.78 Pa, and the highest temperature of the heat source is 143.58 °C; the application of the leaf vein-like liquid cooling plate flow channel of Example 1 to the heat source equipment in the aircraft liquid cooling system is superior to that of Comparative Example 1.

[0130] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A vein - like liquid - cooled plate flow channel is arranged inside a rectangular liquid - cooled plate, and is characterized in that, It includes a vein - like flow channel network, a main flow channel, a converging flow channel, a flow channel inlet and a flow channel outlet; The flow channel inlet and the flow channel outlet are symmetrically arranged at the centers of the left and right side edges of the liquid - cooling plate respectively. Among them, the flow channel inlet is arranged at the center of the right side edge of the liquid - cooling plate and is connected to the main flow channel; the flow channel outlet is arranged at the center of the left side plate of the liquid - cooling plate and is connected to the converging flow channel; The main flow channel is arranged at the middle position of the rectangular liquid - cooling plate and is connected to the vein - like flow channel network; the whole vein - like flow channel network is composed of N micro - flow channel units arranged in a zigzag shape and is symmetrically distributed up and down on both sides of the main flow channel.

2. The vein-like liquid-cooling plate flow channel according to claim 1, wherein The zigzag - shaped micro - flow channel unit includes parallel straight flow channels and parallel inclined flow channels. The outlet ends of the straight flow channels are flush and are connected to the converging flow channel.

3. The vein-like liquid-cooling plate flow channel according to claim 1, wherein The zigzag - shaped micro - flow channel units on the same side of the main flow channel are parallel to each other.

4. The vein-like liquid-cooling plate flow channel according to claim 1, wherein The included angle ɑ between the main flow channel and the inclined flow channels of the zigzag - shaped micro - flow channel units on the same side of the main flow channel satisfies 30°≤ɑ≤60°.

5. The vein-like liquid-cooling plate flow channel according to claim 1, wherein The cross - section of the flow channels in the zigzag - shaped micro - flow channel unit, facing the direction of the flow channel inlet, is rectangular and satisfies: 1.5*W≤K≤3*W; where, W is the width of the flow channel in the zigzag - shaped micro - flow channel unit, in mm; K is the spacing between the flow channels in the zigzag - shaped micro - flow channel unit, in mm.

6. The vein-like liquid-cooling plate flow channel according to claim 5, characterized in that, The width of the main flow channel, the width of the converging flow channel, and the equivalent diameters of the flow channel inlet and the flow channel outlet are equal and satisfy: W1=W2=D≥N*W; where, W1 is the width of the main flow channel, in mm; W2 is the width of the converging flow channel, in mm; D is the equivalent diameter of the flow channel inlet and the flow channel outlet, in mm; W is the width of the flow channel in the zigzag - shaped micro - flow channel unit, in mm; N is the number of zigzag - shaped micro - flow channel units, in pieces.

7. The leaf vein-like liquid cooling plate flow channel according to claim 5, characterized in that, The length of the main flow channel is three times the width of the main flow channel.

8. A design method for a vein - like liquid - cooling plate flow channel, which is used to design the vein - like liquid - cooling plate flow channel according to any one of claims 1 - 8, includes the following steps: S1: Obtain the actual available rectangular bottom plate of the liquid - cooling plate; S2: Design the initial shape and size of the vein - like liquid - cooling plate flow channel to obtain the size and shape of the target flow channel; S3: According to the size and shape of the target flow channel, use the sketch tool of the modeling software to draw the basic shape and size of the flow channel on a plane; S4: Use the feature tool of the modeling software to convert the sketch into a three - dimensional entity to obtain the first vein - like liquid - cooling plate flow channel model; S5: Use the modeling software to extract the inner cavity model of the first vein - like liquid - cooling plate flow channel model, import it into the simulation software for mesh generation, boundary condition setting, working fluid property parameter and solution parameter setting, and perform a solution to obtain the flow resistance of the flow channel, the flow rate of the flow channel, and the average temperature; S6: Analyze the flow resistance of the flow channel, the flow rate of the flow channel, and the average temperature obtained in step S5. According to the analysis results, optimize the structure of the first vein - like liquid - cooling plate flow channel model to obtain the second vein - like liquid - cooling plate flow channel model; Simulate and analyze the flow resistance, flow rate in the flow channels, and average temperature of the second leaf vein-like liquid cooling plate flow channel model. According to the simulation analysis results of the second leaf vein-like liquid cooling plate flow channel model and the first leaf vein-like liquid cooling plate flow channel model, determine whether the simulation analysis results meet the stop iteration condition. If they meet, determine the second leaf vein-like liquid cooling plate flow channel model as the final liquid cooling plate flow channel model. If they do not meet, optimize the structure of the second leaf vein-like liquid cooling plate flow channel model; Repeat the simulation analysis until the Nth leaf vein-like liquid cooling plate flow channel model obtained after N iterations meets the stop iteration condition, which is the final leaf vein-like liquid cooling plate flow channel model.

9. The design method according to claim 8, characterized in that In step S5, the scale of the grid is 0.01 times the diameter of the flow channel inlet.

10. The design method according to claim 9, wherein In step S6, the condition for stopping iteration is that the flow resistance of the (N - 1)-th leaf vein-like liquid cooling plate flow channel model is P N-1 , and the flow resistance of the N-th leaf vein-like liquid cooling plate flow channel model is P N . When abs(P N - P N-1 ) / P N-1 ≤ 0.01, stop iteration to obtain the final leaf vein-like liquid cooling plate flow channel model.

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