S-shaped single serial skin runner and design method thereof

Abstract

The invention relates to an S-shaped single series skin runner 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 cold source equipment. An S-shaped single serial skin runner is arranged in a skin and comprises a medium runner. The medium flow channel is in a continuous S shape, is turned by 180 degrees for five times, and comprises a first U-shaped section, a second U-shaped section, a third U-shaped section, a first curve section and a second curve section; in the width direction of the skin, the first U-shaped section, the second U-shaped section and the third U-shaped section are sequentially arranged from the long edge of the upper side of the skin to the long edge of the lower side of the skin; the first U-shaped section, the second U-shaped section and the third U-shaped section are connected in series, the first U-shaped section and the second U-shaped section are communicated with each other through a first curve section on the opening side of the U shape, and the second U-shaped section and the third U-shaped section are communicated with each other through a second curve section on the opening side of the U shape. The S-shaped single series skin runner is applied to cold 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 for aircraft, and particularly to an S-shaped single-strip series skin 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.) leads to a continuous increase in the power consumption of the devices; second, the design of the aircraft platform tends to be lightweight and miniaturized, resulting in a higher degree of device integration and a further increase in the heat flux density; third, with the increase in the flight time of the aircraft, the electronic devices face a longer working time. In summary, the aircraft platform faces the severe challenges of high power consumption, long working hours, and high heat flux density.

[0003] The existing thermal 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 consumption-type cold source can only support the device to work for a limited time; the other is the use of compression refrigeration, and its disadvantage is that it consumes a large amount of electric energy and has a large volume and mass itself.

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

[0005] In view of the above analysis, the embodiments of the present invention aim to provide an S-shaped single-strip series skin flow channel and a design method thereof, so as to solve the problems that the cold source device of the heat dissipation system occupies a large space on the aircraft platform 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 an S-shaped single-strip series skin flow channel, which is arranged inside the skin and includes a medium flow channel, a flow channel inlet, and a flow channel outlet;

[0008] The overall shape of the medium flow channel is a continuous S shape, with 5 times of 180° turns, including: a first U-shaped section, a second U-shaped section, a third U-shaped section, a first curve section, and a second curve section;

[0009] Along the width direction of the skin, the first U-shaped section, the second U-shaped section, and the third U-shaped section are arranged in sequence from the upper long side of the skin to the lower long side of the skin;

[0010] The first U-shaped section, the second U-shaped section, and the third U-shaped section are connected in series. The first U-shaped section and the second U-shaped section are interconnected through a first curved section on the mouth side of the "U", and the second U-shaped section and the third U-shaped section are interconnected through a second curved section on the mouth side of the "U".

[0011] The runner inlet and the runner outlet are respectively arranged at both ends of the short side on the right side of the skin.

[0012] The runner inlet is located at one end of the upper side of the first U-shaped section on the mouth side of the "U" and is connected to the upper side of the first U-shaped section.

[0013] The runner outlet is located at one end of the lower side of the third U-shaped section on the mouth side of the "U" and is connected to the lower side of the third U-shaped section.

[0014] Further, the bottoms of the "U" shapes of the first U-shaped section, the second U-shaped section, and the third U-shaped section are located at one end of a short side of the skin, and the mouths of the "U" shapes of the first U-shaped section, the second U-shaped section, and the third U-shaped section are located at one end of the other short side of the skin opposite to the bottom.

[0015] One side of the "U" shape of the first U-shaped section, the second U-shaped section, and the third U-shaped section is symmetrically arranged with the other side of the "U" shape.

[0016] Further, the cross-section perpendicular to the opening direction of the "U" mouth of the first U-shaped section, the second U-shaped section, and the third U-shaped section is rectangular, and the sides of the rectangle are transitioned through rounded corners.

[0017] Further, it is characterized in that the distances between the first U-shaped section, the second U-shaped section, and the third U-shaped section are equal.

[0018] The distance between the upper side length and the lower side length of the first U-shaped section is equal to the distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section.

[0019] The distance between the upper side length and the lower side length of the second U-shaped section is equal to the distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section.

[0020] The distance between the upper side length and the lower side length of the third U-shaped section is equal to the distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section.

[0021] Further, the diameters of the runner inlet and the runner outlet are equal.

[0022] Further, the distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section satisfies 1 / 2*W ≤ K ≤ 3 / 4*W, where K is the distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section, in mm, and W is the width of the rectangle of the cross-section perpendicular to the opening direction of the "U" mouth of the first U-shaped section, the second U-shaped section, and the third U-shaped section, in mm.

[0023] On the other hand, the present invention also provides a design method for an S-shaped single-strip series skin flow channel for designing the above-mentioned S-shaped single-strip series skin flow channel, including the following steps:

[0024] S1: Obtain the actually available rectangular skin;

[0025] S2: Design the preliminary shape and size of the S-shaped single-strip series skin flow channel to obtain the size and shape of the target flow channel;

[0026] 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;

[0027] S4: Use the feature tool of the modeling software to convert the sketch into a three-dimensional entity to obtain the first S-shaped single-strip series skin flow channel model;

[0028] S5: Use the modeling software to extract the inner cavity model of the first S-shaped single-strip series skin flow channel model, import it into the simulation software for mesh generation, boundary condition setting, working medium physical property parameter setting and solution parameter setting, and perform solution to obtain the flow resistance of the flow channel, the flow rate of the medium flow channel and the average temperature;

[0029] S6: Analyze the flow resistance of the flow channel, the flow rate of the medium flow channel and the average temperature obtained in step S5. According to the analysis results, optimize the structure of the first S-shaped single-strip series skin flow channel model to obtain the second S-shaped single-strip series skin flow channel model;

[0030] Perform simulation analysis on the flow resistance, flow rate and average temperature of the second S-shaped single-strip series skin flow channel model. According to the simulation analysis results of the second S-shaped single-strip series skin flow channel model and the first S-shaped single-strip series skin flow channel model, judge whether the simulation analysis structure meets the stop iteration condition. If it meets, determine the second S-shaped single-strip series skin flow channel model as the final skin flow channel model. If it does not meet, optimize the structure of the second S-shaped single-strip series skin flow channel model, repeat the simulation analysis until the Nth S-shaped single-strip series skin flow channel model obtained after N iterations meets the stop iteration condition, which is the final S-shaped single-strip series skin flow channel model.

[0031] Further, in step S5, the scale of the mesh is 0.01 times the diameter of the flow channel inlet.

[0032] Further, in step S6, the condition for stopping iteration is: the flow resistance of the (N - 1)th S-shaped single-strip series skin flow channel model is P N-1 , the flow resistance of the Nth S-shaped single-strip series skin flow channel model is P N , when it satisfies abs(P N - P N-1 ) / PN-1 When it is ≤ 0.01, stop the iteration to obtain the final S-shaped single-strip series skin flow channel model.

[0033] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0034] 1. The S-shaped single-strip series skin flow channel of the present invention is integrally continuous S-shaped, undergoes 5 times of 180° turns, and spreads over the entire skin surface. When the S-shaped single-strip series skin flow channel is applied to the aircraft skin heat exchanger, it can maintain the continuous operation of the electronic equipment for more than 2 hours with a relatively small occupation of the space inside the aircraft platform cabin.

[0035] 2. When the S-shaped single-strip series skin 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.

[0036] 3. When the S-shaped single-strip series skin flow channel of the present invention is applied to the aircraft skin heat exchanger, only the skin at the flow channel position is appropriately thickened, without occupying additional space inside the cabin.

[0037] 4. When the S-shaped single-strip series skin flow channel of the present invention is applied to the aircraft skin heat exchanger, the heat generated by the electronic equipment is transported to the skin through a circulation pipeline, and then the temperature is reduced through the heat exchange between the skin and the outside air, realizing the application requirements of the cold source equipment in the aircraft heat dissipation 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 S-shaped single-strip series skin flow channel of the present invention is applied to the aircraft cold source equipment, the flow resistance of the flow channel ≤ 5000 Pa, and the heat exchange area ≥ 24000 mm 2 .

[0038] 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 obvious from the specification or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the content specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings are only for the purpose of showing specific embodiments and are not considered as a limitation to the present invention. Throughout the drawings, the same reference signs represent the same components.

[0040] Figure 1 is a schematic diagram of the S-shaped single-strip series skin flow channel of the present invention;

[0041] Figure 2 is the combined pressure nephogram of the S-shaped single-strip series skin flow channel of the present invention;

[0042] Figure 3 This is the structural diagram of the ground verification system in Embodiment 1 of the present invention.

[0043] Reference numerals: 1 - first U-shaped section; 2 - second U-shaped section; 3 - third U-shaped section; 4 - first curved section; 5 - second curved section; 6 - runner inlet; 7 - runner outlet; R - fillet radius of the three U-shaped sections; 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; R' - fillet radius of the rectangular cross-section of the runner in the A - A direction; K - spacing between the upper and lower side lengths of the second U-shaped section. Detailed implementation manners

[0044] 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.

[0045] An S-shaped single-strip series skin runner is provided inside the skin and includes a runner inlet, a runner outlet, and a medium runner;

[0046] The medium runner is integrally continuous S-shaped and undergoes 5 times of 180° turns to cover the entire skin surface; it includes: a first U-shaped section, a second U-shaped section, a third U-shaped section, a first curved section, and a second curved section;

[0047] It can be understood that the first U-shaped section, the second U-shaped section, and the third U-shaped section are all "U" runners. Along the width direction of the skin, the first U-shaped section, the second U-shaped section, and the third U-shaped section are arranged in sequence from the upper long side to the lower long side of the skin. The first U-shaped section and the second U-shaped section are connected to each other through the first curved section, and the second U-shaped section and the third U-shaped section are connected to each other through the second curved section; the bottoms of the "U" shapes of the first U-shaped section, the second U-shaped section, and the third U-shaped section are located at one end of a short side of the skin, and the mouths of the "U" shapes of the first U-shaped section, the second U-shaped section, and the third U-shaped section are located at the other short side of the skin opposite to the bottom; one side of the "U" shape of the first U-shaped section, the second U-shaped section, and the third U-shaped section is symmetrically arranged with the other side; the first U-shaped section, the second U-shaped section, and the third U-shaped section are connected in series through the first curved section and the second curved section in sequence. The first U-shaped section and the second U-shaped section are connected to each other through the first curved section on the mouth side of the "U" shape, and the second U-shaped section and the third U-shaped section are connected to each other through the second curved section on the mouth side of the "U" shape.

[0048] The cross-section of the first U-shaped section, the second U-shaped section, and the third U-shaped section perpendicular to the opening direction of the "U" mouth is rectangular, and the sides of the rectangle are transitioned through fillets. The width of the rectangle is W, the height is H, and the fillet radius is R'. The fillet radius R' satisfies:

[0049] R’ = 1 / 2 * min(W, H);

[0050] The fillet radius R’ satisfying this condition can play a self - supporting role, and no additional support is required during the subsequent additive manufacturing process. The unit is mm for all.

[0051] The fillet radius at the bottom corner of the "U" shape of the first U - shaped section, the second U - shaped section, and the third U - shaped section is R; the fillet radius of the first curve section and the second curve section is equal to the fillet radius at the bottom corner of the "U" shape of the first U - shaped section, the second U - shaped section, and the third U - shaped section, and is also R. R satisfies:

[0052] 1 / 2 * W ≤ R ≤ 2 / 3 * W, unit mm;

[0053] The fillet radius at the bottom corner of the "U" shape of the first U - shaped section, the second U - shaped section, and the third U - shaped section and the fillet radius of the first curve section and the second curve section satisfying this condition can ensure the flow - guiding effect of the medium flow channel.

[0054] The first U - shaped section, the second U - shaped section, and the third U - shaped section are equidistant from each other, and the distance is K; the distance between the upper side and the lower side of the first U - shaped section, the distance between the upper side and the lower side of the second U - shaped section, and the distance between the upper side and the lower side of the third U - shaped section are all equal, and are also K; the unit is mm and satisfies:

[0055] 1 / 2 * W ≤ K ≤ 3 / 4 * W;

[0056] Satisfying this condition can improve the heat dissipation effect of the skin, and make the convective heat transfer amount and the heat conduction amount of the skin achieve balance.

[0057] The flow channel inlet is cylindrical and is connected to the upper side of the first U - shaped section, located at one end of the "U" - shaped opening side of the upper side of the first U - shaped section; the flow channel outlet is cylindrical and is connected to the lower side of the third U - shaped section, located at one end of the "U" - shaped opening side of the lower side of the third U - shaped section; the diameters of the flow channel inlet and the flow channel outlet are both D, and satisfy:

[0058] D = 2 * W * H / (W + H), unit mm;

[0059] The diameters of the flow channel inlet and the flow channel outlet satisfying this condition can ensure sufficient flow supply of the medium at the inlet and outlet of the flow channel;

[0060] The flow channel inlet and the flow channel outlet are respectively arranged at both ends of the short side on the right side of the skin. The distance between the flow channel inlet and the short side on the right side of the skin and the long side on the upper side of the skin is 3D, and the distance between the flow channel outlet and the short side on the right side of the skin and the long side on the lower side of the skin is 3D. The positions of the flow channel inlet and the flow channel outlet satisfying this condition can ensure that the medium traverses the entire skin flow channel.

[0061] The present invention also provides a design method for an S-shaped single-strip series skin flow channel for manufacturing the above-mentioned S-shaped single-strip series skin flow channel, including the following steps:

[0062] S1: Obtain the actually available rectangular skin;

[0063] S2: Design the preliminary shape and size of the S-shaped single-strip series skin flow channel to obtain the size and shape of the target flow channel;

[0064] 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;

[0065] S4: Use the feature tool of the modeling software to convert the sketch into a three-dimensional entity to obtain the first S-shaped single-strip series skin flow channel model;

[0066] S5: Use the modeling software to extract the inner cavity model of the first S-shaped single-strip series skin flow channel model, import it into the simulation software for mesh division, boundary condition setting, working medium physical property parameter setting and solution parameter setting, and perform solution to obtain the flow channel flow resistance, medium flow channel flow rate and average temperature;

[0067] S6: Analyze the flow channel flow resistance, medium flow channel flow rate and average temperature obtained in step S5. According to the analysis results, optimize the structure of the first S-shaped single-strip series skin flow channel model to obtain the second S-shaped single-strip series skin flow channel model;

[0068] Perform simulation analysis on the flow channel flow resistance, medium flow channel flow rate and average temperature of the second S-shaped single-strip series skin flow channel model. According to the simulation analysis results of the second S-shaped single-strip series skin flow channel model and the first S-shaped single-strip series skin flow channel model, judge whether the simulation analysis structure meets the stop iteration condition. If it meets, determine the second S-shaped single-strip series skin flow channel model as the final skin flow channel model. If it does not meet, optimize the structure of the second S-shaped single-strip series skin flow channel model, repeat the simulation analysis until the Nth S-shaped single-strip series skin flow channel model obtained after N iterations meets the stop iteration condition, which is the final S-shaped single-strip series skin flow channel model.

[0069] Specifically, in step S2, when designing the preliminary shape and size of the S-shaped single-strip series skin flow channel to obtain the size and shape of the target flow channel, it includes the following steps:

[0070] S21: Set the flow channel inlet and flow channel outlet on the skin to determine the positions and sizes of the flow channel inlet and flow channel outlet;

[0071] Specifically, the position of the runner inlet is 3D away from the right short side and the upper long side of the skin, and the position of the runner outlet is 3D away from the right short side and the lower side of the skin, where D is the diameter of the runner inlet and the runner outlet.

[0072] S22: Set a medium runner on the skin, and this medium runner includes a first U-shaped section, a second U-shaped section, and a first curved section to obtain the size and shape of the target runner.

[0073] Among them, the distance from the upper side of the U opening of the first U-shaped section to the upper long side of the skin > 2 mm, and the distance from the bottom of the U opening of the first U-shaped section to the left short side of the skin > 2 mm; the first U-shaped section and the second U-shaped section are connected in series through the first curved section, and the shape and size of the second U-shaped section are the same as those of the first U-shaped section.

[0074] Among them, the cross-section of the first U-shaped section facing the "U" opening direction is a rectangle, and the sides of the rectangle are transitioned through rounded corners. The width of this rectangle is W, the height is H, and the radius of the rounded corner is R', and its radius of the rounded corner R' satisfies: R' = 1 / 2 * min(W, H);

[0075] The distance between the first U-shaped section and the second U-shaped section is K; the distances between the upper and lower sides of the first U-shaped section and the distances between the upper and lower sides of the second U-shaped section are both equal, also K; in units of mm, satisfying 1 / 2 * W ≤ K ≤ 3 / 4 * W.

[0076] Specifically, in step S5, use modeling software to extract the inner cavity model of the first S-shaped single-strip series-connected skin runner model, import it into the simulation software for mesh generation, and perform mesh independence analysis. The mesh scale is D / 100, which can balance the simulation efficiency and accuracy;

[0077] Then set the boundary conditions, and the boundary conditions are: set the velocity and temperature boundary conditions at the runner inlet position, the velocity value is 3.5 - 4 L / min, and the temperature value is 50 - 60 °C; set the pressure boundary condition at the runner outlet position, the pressure value is 0 - 0.1 MPa; set the thermal boundary condition on the outer surface of the skin, and the convective heat transfer coefficient is 300 - 400 W / (m 2 -K), and the ambient air temperature value is 10 - 20 °C.

[0078] Set the physical property parameters of the working medium, including the density, specific heat capacity, and viscosity of the working medium;

[0079] 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 runner, the flow rate and average temperature of the medium runner.

[0080] Specifically, in step S6, the condition for stopping iteration is: the flow resistance of the (N - 1)S-shaped single-strip series-connected skin runner model is PN-1 , the flow resistance of the Nth S-type single-strip series skin 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 S-type single-strip series skin flow channel model.

[0081] Specifically, in step S6, the structural optimization includes adjusting the diameters of the flow channel inlet and the flow channel outlet to satisfy D = 2*W*H / (W + H), and gradually increasing the number of U-shaped sections and curved sections of the S-type single-strip series skin flow channel model until the obtained final S-type single-strip series skin flow channel model meets the condition for stopping the iteration.

[0082] The S-type single-strip series skin flow channel model of the present invention can be applied to the cold source equipment in the aircraft liquid cooling system, using a part of the aircraft skin. The flow channel flows through the skin through the inlets and outlets on the inner side of the cabin, and exchanges heat with the outside through the skin, so as to achieve the refrigeration effect.

[0083] Embodiment 1

[0084] The S-type single-strip series skin flow channel of this embodiment is arranged in a rectangular skin and includes a flow channel inlet, a flow channel outlet and a medium flow channel; as Figure 1 shown.

[0085] The overall medium flow channel is a continuous S-type, with 5 180° turns, covering the entire skin surface; it includes: a first U-shaped section, a second U-shaped section, a third U-shaped section, a first curved section and a second curved section;

[0086] It can be understood that the first U-shaped section, the second U-shaped section and the third U-shaped section are all "U" flow channels. Along the width direction of the skin, the first U-shaped section, the second U-shaped section and the third U-shaped section are arranged in sequence from the upper long side of the skin to the lower long side of the skin. The first U-shaped section and the second U-shaped section are connected to each other through the first curved section, and the second U-shaped section and the third U-shaped section are connected to each other through the second curved section; the bottoms of the "U" shapes of the first U-shaped section, the second U-shaped section and the third U-shaped section are located at one end of a short side of the skin, and the mouths of the "U" shapes of the first U-shaped section, the second U-shaped section and the third U-shaped section are located at the other short side of the skin opposite to the bottom; one side of the "U" shape of the first U-shaped section, the second U-shaped section and the third U-shaped section is symmetrically arranged with the other side of the "U" shape; the first U-shaped section, the second U-shaped section and the third U-shaped section are connected in series through the first curved section and the second curved section in sequence. The first U-shaped section and the second U-shaped section are connected to each other through the first curved section on the mouth side of the "U" shape, and the second U-shaped section and the third U-shaped section are connected to each other through the second curved section on the mouth side of the "U" shape.

[0087] The cross-sections of the first U-shaped section, the second U-shaped section, and the third U-shaped section perpendicular to the opening direction of the "U" are rectangles. The sides of the rectangle are transitioned through rounded corners. The width of the rectangle is W = 9 mm, the height is H = 3 mm, and the radius of the rounded corner is R' = 1.5 mm. The radius of the rounded corner R' satisfies: R' = 1 / 2 * min(W, H), and the unit is mm for all.

[0088] The radius of the rounded corner at the corner of the first U-shaped section, the second U-shaped section, and the third U-shaped section is R = 5 mm, satisfying 1 / 2 * W ≤ R ≤ 2 / 3 * W, with the unit mm; the radius of the rounded corner of the first curve section and the second curve section is equal to the radius of the rounded corner at the corner of the first U-shaped section, the second U-shaped section, and the third U-shaped section, also being R = 5 mm;

[0089] The first U-shaped section, the second U-shaped section, and the third U-shaped section are equidistant from each other, with a spacing of K = 6 mm; the distances between the upper and lower sides of the first U-shaped section, the second U-shaped section, and the third U-shaped section are also equal, also being K = 6 mm; the unit is mm, satisfying 1 / 2 * W ≤ K ≤ 3 / 4 * W;

[0090] The inlet and outlet of the flow channel are cylindrical, with a diameter of D = 4.5 mm, satisfying D = 2 * W * H / (W + H), and the unit is mm;

[0091] The inlet and outlet of the flow channel are respectively arranged at both ends of the short side on the right side of the skin. The distance from the inlet of the flow channel to the short side on the right side of the skin and the long side on the upper side of the skin is 13.5 mm, and the distance from the outlet of the flow channel to the short side on the right side of the skin and the long side on the lower side of the skin is 13.5 mm.

[0092] The combined pressure contour map of the S-shaped single-strip series skin flow channel in this embodiment is as Figure 2 shown. It can be seen from the figure that the flow resistance obtained from the simulation calculation of the S-shaped single-strip series skin flow channel in this embodiment is 4856.02 Pa.

[0093] Embodiment 2

[0094] The S-shaped single-strip series skin flow channel designed in Embodiment 1 is actually verified by a ground verification system.

[0095] The structure of the ground verification system is as Figure 3 shown. The verification system consists of a liquid storage tank, a flow meter, a gear pump, a simulated heat load, a heat dissipation skin, and sensors. The sensors are arranged at the inlet and outlet positions of the S-shaped single-strip series skin flow channel;

[0096] The verification conditions are: a heat flux of 50 W / cm 2 is loaded;

[0097] Verified by the actual ground verification system, the flow resistance of the S-shaped single-strip series skin flow channel is 4856.02 Pa, and the heat transfer area is 24991 mm 2 , having a good cooling and heat transfer effect.

[0098] Embodiment 3

[0099] This embodiment is a design method for the S-shaped single-strip series skin flow channel of Embodiment 1, including the following steps:

[0100] S1: Obtain the actually available rectangular skin;

[0101] S2: Design the preliminary shape and size of the S-shaped single-strip series skin flow channel to obtain the size and shape of the target flow channel;

[0102] S21: Set the flow channel inlet and the flow channel outlet on the skin, and determine the positions and sizes of the flow channel inlet and the flow channel outlet;

[0103] Specifically, the position of the flow channel inlet is 3D away from the right short side and the upper long side of the skin, and the position of the flow channel outlet is 3D away from the right short side and the lower side of the skin, where D is the diameter of the flow channel inlet and the flow channel outlet, and D = 5 mm;

[0104] S22: Set the medium flow channel on the skin, and this medium flow channel includes a first U-shaped section, a second U-shaped section and a first curve section to obtain the size and shape of the target flow channel.

[0105] Among them, the distance from the upper side of the U opening of the first U-shaped section to the upper long side of the skin is 4 mm, and the distance from the bottom of the U opening of the first U-shaped section to the left short side of the skin is 4 mm; the first U-shaped section and the second U-shaped section are connected in series through the first curve section, and the shape and size of the second U-shaped section are the same as those of the first U-shaped section.

[0106] Among them, the cross-section of the first U-shaped section facing the direction of the "U" opening is a rectangle, the width of this rectangle is W = 9 mm, the height is H = 3 mm, and the fillet radius is R' = 1.5 mm, and its fillet radius R' satisfies: R' = 1 / 2 * min(W, H);

[0107] The distance between the first U-shaped section and the second U-shaped section is K; the distances between the upper and lower sides of the first U-shaped section and the distances between the upper and lower sides of the second U-shaped section are all equal, and are also K; in units of mm, K = 6 mm, satisfying 1 / 2 * W ≤ K ≤ 3 / 4 * W.

[0108] 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;

[0109] S4: Use the feature tool of the modeling software to convert the sketch into a three-dimensional solid to obtain the first S-shaped single-strip series skin flow channel model;

[0110] S5: Extract the inner cavity model of the first S-shaped single-strip series skin flow channel model using modeling software, import it into the simulation software for mesh generation, boundary condition setting, and solution parameter setting, and then solve to obtain the flow resistance of the flow channel, the flow rate of the medium in the flow channel, and the average temperature;

[0111] Among them, the mesh scale is D / 100, which can balance the simulation efficiency and accuracy;

[0112] The boundary conditions are as follows: Set the velocity and temperature boundary conditions at the inlet of the flow channel, with the velocity value being 3.5 L / min and the temperature value being 50 °C; Set the pressure boundary condition at the outlet of the flow channel, with the pressure value being 0.1 MPa; Set the thermal boundary condition on the outer surface of the skin, with the convective heat transfer coefficient being 300 W / (m 2 -K), and the ambient air temperature value being 10 °C;

[0113] Set the physical property parameters of the working medium: 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.

[0114] 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.

[0115] S6: Analyze the flow resistance of the flow channel, the flow rate of the medium in the flow channel, and the average temperature obtained in step S5. According to the analysis results, optimize the structure of the first S-shaped single-strip series skin flow channel model, reduce the diameters of the outlet and inlet of the flow channel to 4.5 mm, add a U-shaped section and a curved section, so that the overall medium flow channel makes 5 180° turns, obtain the second S-shaped single-strip series skin flow channel model, and conduct a simulation analysis on the flow resistance and flow rate of the second S-shaped single-strip series skin flow channel model.

[0116] Among them, the flow resistance of the second S-shaped single-strip series skin flow channel model is P 2 = 4856.02 Pa, and that of the first S-shaped single-strip series skin flow channel model is P 1 = 4856.028 Pa, satisfying abs(P N -P N-1 ) / P N-1 ≤ 0.01, stop the iteration, and the second S-shaped single-strip series skin flow channel model is the final S-shaped single-strip series skin flow channel model.

[0117] Comparative Example 1

[0118] The S-shaped single-strip series skin flow channel in this comparative example is arranged in a rectangular skin and includes a flow channel inlet, a flow channel outlet, and a medium flow channel;

[0119] The overall medium flow channel is in an S shape, with 5 180° turns, covering the entire skin surface; it includes: a first U-shaped section, a second U-shaped section, a third U-shaped section, a first curved section, and a second curved section;

[0120] It can be understood that the first U-shaped section, the second U-shaped section, and the third U-shaped section are all "U" channels. Along the width direction of the skin, the first U-shaped section, the second U-shaped section, and the third U-shaped section are arranged in sequence from the upper long side to the lower long side of the skin. The first U-shaped section and the second U-shaped section are connected to each other through the first curved section, and the second U-shaped section and the third U-shaped section are connected to each other through the second curved section; the bottom of the "U" shape of the first U-shaped section, the second U-shaped section, and the third U-shaped section is located at one end of a short side of the skin, and the mouth of the "U" shape of the first U-shaped section, the second U-shaped section, and the third U-shaped section is located at the other short side of the skin opposite to the bottom; one side of the "U" shape of the first U-shaped section, the second U-shaped section, and the third U-shaped section is symmetrically arranged with the other side of the "U" shape; the first U-shaped section, the second U-shaped section, and the third U-shaped section are connected in series through the first curved section and the second curved section in sequence. The first U-shaped section and the second U-shaped section are connected to each other through the first curved section on the mouth side of the "U" shape, and the second U-shaped section and the third U-shaped section are connected to each other through the second curved section on the mouth side of the "U" shape.

[0121] The cross-section of the first U-shaped section, the second U-shaped section, and the third U-shaped section facing the "U" mouth direction is a rectangle, with a width of W = 9 mm, a height of H = 3 mm, and a fillet radius of R' = 1.5 mm. Its fillet radius R' satisfies: R' = 1 / 2 * min(W, H), and the unit is mm for all.

[0122] The fillet radius at the corners of the first U-shaped section, the second U-shaped section, and the third U-shaped section is R = 5 mm, satisfying 1 / 2 * W ≤ R ≤ 2 / 3 * W, with the unit of mm; the fillet radius of the first curved section and the second curved section is equal to the fillet radius at the corners of the first U-shaped section, the second U-shaped section, and the third U-shaped section, also being R = 5 mm;

[0123] The first U-shaped section, the second U-shaped section, and the third U-shaped section are equidistant from each other, with a spacing of K = 4 mm; the distance between the upper and lower sides of the first U-shaped section, the distance between the upper and lower sides of the second U-shaped section, and the distance between the upper and lower sides of the third U-shaped section are all equal, also being K = 4 mm; the unit is mm, and it does not satisfy 1 / 2 * W ≤ K ≤ 3 / 4 * W.

[0124] The inlet and outlet of the flow channel are cylindrical, with a diameter of D = 3.5 mm, and it does not satisfy D = 2 * W * H / (W + H), with the unit of mm;

[0125] The runner inlet and the runner outlet are respectively arranged at both ends of the short side on the right side of the skin. The distance from the runner inlet to the short side on the right side of the skin and the long side on the upper side of the skin is 10.5 mm, and the distance from the runner outlet to the short side on the right side of the skin and the long side on the lower side of the skin is 10.5 mm.

[0126] Apply the S-shaped single-strip series skin runner of Example 1 and Comparative Example 1 to the cold source device in the aircraft liquid cooling system. Use a part of the aircraft skin and verify it through the actual ground verification system. The flow resistance of the S-shaped single-strip series skin runner of Example 1 is 4856.02 Pa, and the heat transfer area is 24991 mm 2 , the flow resistance of the multi-branch parallel skin runner of Comparative Example 1 is 7385.17 Pa, and the heat transfer area is 23032 mm 2 , and the application of the S-shaped single-strip series skin runner of Example 1 to the cold source device in the aircraft liquid cooling system is superior to that of Comparative Example 1.

[0127] As mentioned above, it 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 within the protection scope of the present invention.

Claims

1. An S-shaped single-strip series-connected skin flow channel is arranged inside the skin. Characterized in that, It includes a medium flow channel, a flow channel inlet and a flow channel outlet; The overall medium flow channel is a continuous S shape, with 5 times of 180° turns, including: a first U-shaped section, a second U-shaped section, a third U-shaped section, a first curve section and a second curve section; Along the width direction of the skin, the first U-shaped section, the second U-shaped section, and the third U-shaped section are arranged in sequence from the upper long side of the skin to the lower long side of the skin; The first U-shaped section, the second U-shaped section, and the third U-shaped section are connected in series. The first U-shaped section and the second U-shaped section are interconnected through the first curve section on the side of the "U" mouth, and the second U-shaped section and the third U-shaped section are interconnected through the second curve section on the side of the "U" mouth; The flow channel inlet and the flow channel outlet are respectively arranged at both ends of the short side on the right side of the skin; The flow channel inlet is located at one end on the side of the upper "U" mouth of the first U-shaped section and is connected to the upper side of the first U-shaped section; The flow channel outlet is located at one end on the side of the lower "U" mouth of the third U-shaped section and is connected to the lower side of the third U-shaped section.

2. The S-shaped single-strip series-connected skin flow channel according to claim 1, Characterized in that, The bottoms of the "U" shapes of the first U-shaped section, the second U-shaped section, and the third U-shaped section are located at one end of a short side of the skin, and the mouths of the "U" shapes of the first U-shaped section, the second U-shaped section, and the third U-shaped section are located at the other end of the short side of the skin opposite to the bottom.

3. The S-shaped single-strip series-connected skin flow channel according to claim 2, Characterized in that, One side of the "U" shape of the first U-shaped section, the second U-shaped section, and the third U-shaped section is symmetrically arranged with the other side of the "U" shape.

4. The S-shaped single-strip series-connected skin flow channel according to claim 1, Characterized in that, The cross-section perpendicular to the opening direction of the "U" mouth of the first U-shaped section, the second U-shaped section, and the third U-shaped section is a rectangle, and the sides of the rectangle are transitioned by rounded corners.

5. The S-shaped single-strip series-connected skin flow channel according to claim 4, Characterized in that, The distances between the first U-shaped section, the second U-shaped section, and the third U-shaped section are equal; The distance between the upper side length and the lower side length of the first U-shaped section is equal to the distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section; The distance between the upper side length and the lower side length of the second U-shaped section is equal to the distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section; The distance between the upper side length and the lower side length of the third U-shaped section is equal to the distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section.

6. The S-shaped single-strip series-connected skin flow channel according to claim 3, Characterized in that, The diameters of the flow channel inlet and the flow channel outlet are equal.

7. The S-shaped single-strip series-connected skin flow channel according to claim 5, Characterized in that, The distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section satisfies 1 / 2*W ≤ K ≤ 3 / 4*W, where K is the distance between the first U-shaped section, the second U-shaped section, and the third U-shaped section, in mm, and W is the width of the rectangle of the cross-section perpendicular to the opening direction of the "U" mouth of the first U-shaped section, the second U-shaped section, and the third U-shaped section, in mm.

8. A design method for an S-shaped single-strip series-connected skin flow channel, which is used to design the S-shaped single-strip series-connected skin flow channel described in any one of claims 1-7. Characterized in that, It includes the following steps: S1: Obtain the actually available rectangular skin. S2: Design the preliminary shape and size of the S-shaped single-strip series-connected skin 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 S-shaped single-strip series-connected skin flow channel model. S5: Use the modeling software to extract the inner cavity model of the first S-shaped single-strip series-connected skin flow channel model, import it into the simulation software for mesh generation, boundary condition setting, working fluid physical property parameter setting and solution parameter setting, and perform a solution to obtain the flow resistance of the flow channel, the flow rate of the medium flow channel and the average temperature. S6: Analyze the flow resistance of the flow channel, the flow rate of the medium flow channel and the average temperature obtained in step S5. According to the analysis results, optimize the structure of the first S-shaped single-strip series-connected skin flow channel model to obtain the second S-shaped single-strip series-connected skin flow channel model. Perform a simulation analysis on the flow resistance, flow rate and average temperature of the second S-shaped single-strip series-connected skin flow channel model. According to the results of the simulation analysis of the second S-shaped single-strip series-connected skin flow channel model and the first S-shaped single-strip series-connected skin flow channel model, judge whether the simulation analysis structure meets the stop iteration condition. If it meets, determine the second S-shaped single-strip series-connected skin flow channel model as the final skin flow channel model. If it does not meet, optimize the structure of the second S-shaped single-strip series-connected skin flow channel model and repeat the simulation analysis until the Nth S-shaped single-strip series-connected skin flow channel model obtained after N iterations meets the stop iteration condition, which is the final S-shaped single-strip series-connected skin flow channel model.

9. According to the design method described in 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. According to the design method described in claim 9, Characterized in that, In step S6, the condition for stopping iteration is that the flow resistance of the (N - 1)th S-type single-strip series skin flow channel model is P N-1 , and the flow resistance of the Nth S-type single-strip series skin 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 S-type single-strip series skin flow channel model.

Images