Wind-heat liquid flow coupling simulation method based on body surface heat management suspension wearable device

Abstract

The invention discloses a wind-heat liquid flow coupling simulation method based on a body surface heat management suspension wearable device, and belongs to the field of wearable medical equipment. The simulation method comprises the following steps: S1, building a geometric model of the body surface thermal management suspension wearable device in a geometric panel of COMSOL software; s2, setting material attributes of the body surface heat management suspension wearable device; s3, performing steady-state wind flow field simulation on the body surface heat management suspension wearable device, and outputting steady-state wind speed distribution; s4, based on the steady-state wind speed distribution, performing steady-state heat flow field simulation on the body surface heat management suspension wearable device, and outputting the fixed power density of a constant heat source; s5, taking simulation results of the steady-state wind flow field and the steady-state heat flow field as initial conditions, and performing transient simulation on the whole wind-heat liquid flow field; therefore, the phenomena of heat lag, unstable wind speed or moisture backflow possibly occurring in the initial heating stage of the equipment can be effectively identified, air port design and heating strategy optimization is guided, and it is ensured that a skin disease patient can obtain stable and comfortable treatment experience in the initial treatment stage.

Description

Technical Field

[0001] The present invention belongs to the field of wearable medical devices, and specifically relates to a wind-heat-liquid flow coupling simulation method based on a body surface thermal management suspension wearable device. Background Art

[0002] In recent years, with people's increasing emphasis on health management, wearable medical devices have gradually become a key development direction in the healthcare field. In addition to monitoring vital signs, wearable medical devices can also be used for disease treatment. For example, non-invasive treatment technologies, including electrotherapy, magnetic therapy, ultrasound therapy, and transdermal drug delivery, have been hot topics in recent research and are also key development areas for wearable therapeutic systems. The skin is the body's first line of defense and largest organ. Compared to traditional treatment methods, thermal therapy can target infected lesions, activate local lymphocytes, and induce systemic immunity, allowing the body's immune system to engage in a "precise counterattack."

[0003] Existing wearable devices for dermatology utilize thermal management with electric heating elements or phase change materials. These garments can adjust their temperature based on the wearer's body temperature, providing a certain level of comfort. However, these technologies often rely on batteries or complex temperature control systems, making the garments heavy and inconvenient to wear for extended periods. They also have limited effectiveness in managing moisture. Moisture-wicking fabrics can effectively wick away sweat, keeping the skin dry. However, these fabrics cannot effectively regulate the skin's surface temperature and can easily accumulate moisture in high-temperature environments, causing discomfort and potentially leading to infection.

[0004] Therefore, there is an urgent need to develop a surface thermal management suspension wearable device that integrates temperature control, moisture management and comfort, and combine it with simulation analysis methods to optimize the structural design and heating strategy. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a wind-heat-liquid flow coupling simulation method based on a body surface thermal management suspension wearable device, which solves the problems in the existing technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A wind-heat-fluid flow coupling simulation method based on a body surface thermal management suspension wearable device is described, wherein the body surface thermal management suspension wearable device includes an annular bladeless fan sleeved on the outside of the body surface, a heating sleeve coaxially arranged at one end of the annular bladeless fan; a fan air inlet is provided on one side of the annular bladeless fan, an air flow inlet is formed between the annular bladeless fan and the body surface, and a fan air outlet is provided in the annular bladeless fan; when the annular bladeless fan is started, gas is sent from the fan air inlet to the fan outlet to form a low-pressure area, and the surrounding air is attracted to enter from the air flow inlet by relying on the Bernoulli effect, thereby forming an enhanced airflow;

[0008] The simulation method comprises the following steps:

[0009] S1, build the geometric model of the body surface thermal management suspension wearable device in the geometry panel of COMSOL software;

[0010] S2, setting the material properties of the body surface thermal management suspension wearable device;

[0011] S3, simulate the steady-state wind flow field of the body surface thermal management suspension wearable device and output the steady-state wind speed distribution;

[0012] S4, based on the steady-state wind speed distribution, simulates the steady-state thermal flow field of the body surface thermal management suspension wearable device and outputs a fixed power density of a constant heat source;

[0013] S5, using the simulation results of the steady-state wind flow field and the steady-state thermal flow field as initial conditions, a transient simulation of the entire wind-heat fluid flow field is performed.

[0014] Furthermore, the heating jacket comprises a three-layer structure, which includes, from the outside to the inside: a thermal insulation and waterproof layer, a metal heating layer and an insulating protective layer.

[0015] Furthermore, in S1, the geometric model includes: a human body, an external environment of the device, an airflow outlet, a thermal insulation and waterproof layer, a metal heating layer, and a fan outlet; after the wind comes out of the airflow outlet, it passes through the human body and reaches the fan outlet.

[0016] Furthermore, in S2, the constant pressure heat capacity given to the human body is 3391 J / (kg×K) and the density is 1109 kg / m 3 , thermal conductivity is 0.37W / (m×K);

[0017] Assign the external environment and internal environment of the device the Air material from the COMSOL material library;

[0018] The thickness of the thermal insulation and waterproof layer and the metal heating layer is 0.8mm, the constant pressure heat capacity is 1700J / (kg×K), and the density is 1150kg / m 3 , thermal conductivity is 0.28W / (m×K), and the grid unit is 2.

[0019] Furthermore, during the simulation of the steady-state wind flow field, the outer wall of the device's external environment is set as an open boundary with no positive stress; the boundary part of the fan outlet is set as the velocity inlet, the initial wind speed is set to 2m / s, and the value is floated above and below. The initial wind speed is determined by observing whether the generated velocity heat map is evenly distributed; the velocity field and pressure field under the initial wind speed are output, and a distribution map of the wind speed near the skin surface is provided.

[0020] Furthermore, in the steady-state thermal flow field simulation process, based on the wind flow field simulation output results, the steady-state wind speed distribution is used as the velocity boundary condition to start the thermal flow field simulation in the cavity; the metal heating layer is used as a constant heat source with a fixed power density of 5000–8000W / m 2 , simulating its continuous heating state; the air part is defined as the forced convection heat transfer area, and the skin surface is set as a constant temperature boundary to simulate the thermal balance conditions of the human body.

[0021] Furthermore, in the transient simulation settings of the wind-heat liquid flow field, the time range was set to 0–600 s, with an initial step size of 0.1 s, which was automatically increased to 1 s later. The initial conditions adopted a steady-state wind speed distribution and a fixed power density of a constant heat source, and simulated the instantaneous cold start of the cavity to the target temperature. The air inlet temperature was set to 20°C. The wind speed climbing curve in the cavity, the uniformity of heat conduction, the delayed response of heat conduction to the skin, and the accumulation and dissipation process of evaporated water vapor concentration in the first 200 s were tracked.

[0022] Furthermore, the shell of the annular bladeless fan is a double-layer structure, and a gap is provided at one end of the double-layer structure away from the air inlet to form the fan outlet.

[0023] Furthermore, the annular bladeless fan includes: an air compressor, a main control module, a fan drive module and a heating control module; the main control module controls the opening of the fan drive module and the heating control module to respectively realize the start and stop control of the annular bladeless fan and the heating jacket.

[0024] Furthermore, the thermal insulation and waterproof layer is made of rubber-plastic thermal insulation material, the metal heating layer is made of aluminum, and the insulating protective layer is made of silicone rubber.

[0025] Beneficial effects of the present invention:

[0026] 1. This invention utilizes the Bernoulli effect of a circular bladeless fan to multiply airflow, removing sweat from the skin's surface. This device effectively manages moisture while providing temperature control, preventing the adverse effects of excessive humidity on skin health and promoting skin self-repair and recovery. The overall design combines temperature control, moisture management, and comfort, fully addressing the specific needs of patients with skin diseases and providing an effective treatment aid.

[0027] 2. This invention simulates and outputs time-series isosurfaces and cross-sectional plots of the wind speed and temperature fields, and extracts the dynamic trajectory of skin surface temperature rise time, local maximum temperature rise points, and wind speed mutation intervals. This effectively identifies thermal hysteresis and wind speed instability that may occur during the initial heating phase of the device, guiding optimization of air vent design and heating strategies, ensuring a smooth and comfortable treatment experience for skin disease patients even in the initial stages of treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 This is a schematic diagram of the overall structure of the lightweight suspension wearable device of the present invention;

[0030] Figure 2 This is a schematic diagram of the three-layer structure of the lightweight suspension clothing of the present invention;

[0031] Figure 3 This is a schematic diagram of the internal working circuit of the bladeless fan of the present invention;

[0032] Figure 4 It is a structural schematic diagram of the airflow outlet of the present invention;

[0033] Figure 5 This is a schematic diagram of the internal geometric model structure of the lightweight suspension wearable device simulation software of the present invention;

[0034] Figure 6 Schematic diagram of the steady-state wind flow field inside the lightweight suspended wearable device of the present invention;

[0035] Figure 7 Schematic diagram of the steady-state thermal flow field inside the lightweight suspended wearable device of the present invention;

[0036] Figure 8 This is a schematic diagram of the transient simulation of the wind-heat liquid flow field inside the lightweight suspended wearable device of the present invention.

[0037] In the figure: 1-human body, 2-annular bladeless fan, 3-fan air inlet, 4-air flow inlet, 5-support frame, 6-heating jacket, 7-air flow outlet, 8-thermal insulation and waterproof layer, 9-metal heating layer, 10-insulation protection layer, 11-fan air outlet, 12-air compressor, 13-power module, 14-main control module, 15-fan drive module, 16-heating control module, 17-air pressure feedback module, 18-elastic sealing ring; 19-external environment of the device. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figure 1 As shown, the body surface thermal management suspension wearable device includes an annular bladeless fan 2 mounted on the outside of a human body 1, and a support frame 5 is provided inside the annular bladeless fan 2 to conform to the human body; after the annular bladeless fan 2 is started, air flow begins to flow toward the body surface;

[0041] A heating sleeve 6 is coaxially provided at one end of the annular bladeless fan 2 for heating the body surface; Figure 2 As shown, the heating sleeve 6 has a three-layer structure, wherein the outermost layer is a thermal insulation and waterproof layer 8 to reduce internal heat loss and prevent liquid penetration; the middle layer is a metal heating layer 9, which generates Joule heat through current conduction and gently heats the skin surface in all directions; the innermost layer is an insulating protective layer 10 to prevent the patient from being electrocuted during use of the device;

[0042] A fan air inlet 3 is provided on one side of the annular bladeless fan 2, and a wind inlet 4 is formed between the annular bladeless fan 2 and the skin of the human body 1. The tail of the heating sleeve 6 is connected to the wind outlet 7. Figure 3 As shown, the shell of the annular bladeless fan 2 is a double-layer structure, and a gap is provided at the end of the double-layer structure away from the air inlet 4 to form a fan outlet 11. After the airflow enters the double-layer structure from the fan inlet 3, it flows out from the fan outlet 11 at high speed.

[0043] like Figure 3 As shown, the annular bladeless fan 2 includes: an air compressor 12, a power module 13, a main control module 14, a fan drive module 15, a heating control module 16 and an air pressure feedback module 17; wherein: the power module 13 supplies power to the fan drive module 15 and the heating control module 16; the main control module 14 controls the opening of the fan drive module 15 and the heating control module 16 to respectively realize the start and stop control of the annular bladeless fan 2 and the heating sleeve 6; when the annular bladeless fan 2 is working, the air compressor 12 first transmits the gas from the fan air inlet 3 to the fan air outlet 11 to form a low-pressure area, and relies on the Bernoulli effect to attract more surrounding air to enter from the air flow inlet 4, forming a more concentrated and powerful airflow;

[0044] When working, the annular bladeless fan 2 displays the internal air pressure value through the air pressure feedback module 17, and controls the opening and closing of the air outlet 7 according to the internal air pressure value, on the one hand to avoid excessive air pressure inside the wearable device, and on the other hand to avoid excessive heat loss inside the wearable device.

[0045] When in use, the lightweight suspension wearable device is first worn on a human body 1 (such as an arm or leg). Then, the main control module 14 turns on the fan drive module 15 and the heating control module 16. The fan drive module 15 controls the annular bladeless fan 2 to start working. The air compressor 12 first transmits gas from the fan inlet 3 to the fan outlet 11. Due to the narrowness of the fan outlet 11, the air is ejected at high speed to form a low-pressure area. Relying on the Bernoulli effect, more surrounding air is attracted to enter from the air flow inlet 4, forming a more concentrated and powerful airflow. This not only allows the airflow to carry away sweat from the skin surface and reduce humidity, but also helps maintain local temperature stability. When the heating control module 16 controls the heating sleeve 6 to work, it uses the Joule heating effect to provide stable heat, which can achieve uniform local temperature distribution and meet the thermal effect requirements in skin disease treatment. The annular bladeless fan 2 and the heating sleeve 6 cooperate with each other to achieve precise control of the temperature and humidity of the lightweight suspension device, improve treatment effects, and enhance patient comfort and safety. The wind outlet 7 at the end is designed to be closed, and the air pressure feedback module 17 displays the internal air pressure value. Only when the internal air pressure value reaches a certain threshold value can the air flow break through the seal of the wind outlet 7 at the end and flow out. The setting of the threshold value will not cause heat to be lost too quickly. The inflow and outflow of air can take away sweat from the human body surface, which can avoid irritation caused by moist skin, keep the skin dry, reduce the negative impact of moisture on skin diseases, and improve the treatment effect.

[0046] In this embodiment, the thermal insulation and waterproof layer 8 is made of rubber-plastic thermal insulation material, the metal heating layer 9 is made of aluminum, and the insulating protective layer 10 is made of silicone rubber.

[0047] In this embodiment, the air pressure feedback module 17 includes an air pressure sensor to measure the air pressure inside the device.

[0048] like Figure 4 As shown, in this embodiment, an elastic sealing ring 18 is provided at the air outlet 7. The diameter of the elastic sealing ring 18 can be naturally compressed or expanded according to the circumference of the wearer's arm to ensure a comfortable fit. When the air pressure reaches a set threshold, the elastic portion of the sealing ring is stretched to form a larger opening, allowing air to flow out.

[0049] Example 2

[0050] Based on the surface thermal management suspension wearable device proposed in Example 1, this embodiment introduces a wind-heat-fluid flow coupling simulation method. The physical field coupling simulation results inside the cavity of the surface thermal management suspension wearable device when it is working are simulated using COMSOL Multiphysics computer software (version 6.3, hereinafter referred to as COMSOL), and continuous adjustment and optimization are performed. The simulation method includes the following steps:

[0051] S1. Create a new "2D axisymmetric" spatial dimension in the "Model Wizard" of COMSOL software, and build the geometric model of the surface thermal management suspension wearable device in the "Geometry" panel;

[0052] like Figure 5 As shown, the constructed geometric model includes: a human body 1, the device's external environment 19, an airflow outlet 7, a thermal insulation and waterproof layer 8 on the outer layer of the heating jacket 6, a metal heating layer 9 on the inner layer of the heating jacket 6, and a fan outlet 11. The length and width of the human arm and the body surface thermal management suspension wearable device are set to a fixed size, and the heating jacket 6 is given a slight deformation during operation, set to 1.0 cm.

[0053] S2, setting the material properties of the body surface thermal management suspension wearable device;

[0054] According to standard literature or experimental data, the constant pressure heat capacity of human body 1 (arm) is 3391 [J / (kg×K)] and the density is 1109 [kg / m 3 ], thermal conductivity is 0.37 [W / (m×K)]; the external environment 19 and the internal environment (gas) of the device are given the "Air" material in the COMSOL material library; the thermal insulation and waterproof layer 8 is given a thickness of 0.8 mm, a constant pressure heat capacity of 1700 [J / (kg×K)], and a density of 1150 [kg / m 3 ], the thermal conductivity is 0.28[W / (m×K)], the grid unit is 2, and the material assigned to the metal heating layer 9 is the "Aluminum[solid,bulk]" material in the COMSOL material library, with a thickness of 0.4mm.

[0055] S3, simulate the steady-state wind flow field of the body surface thermal management suspension wearable device and output the steady-state wind speed distribution;

[0056] like Figure 6 As shown, the above is constructed in the "Turbulence" module of COMSOL software Figure 5 For the geometric model shown, the turbulence model is set to "k-ω," where "k" represents the turbulent kinetic energy and "ω" represents the turbulent frequency. This model describes the generation, development, and dissipation of turbulence by solving two partial differential equations, k and ω. The outer wall of the device's external environment 19 is set as an open boundary with no normal stress. Figure 6 In the wind flow heat map, the color corresponds to the speed. The wind flow field is only reflected in the gas environment, so the human body 1 is not in the Figure 6 Reflected in the wind flow field. Figure 5The air inlet boundary of the blower outlet 11 is the velocity inlet. The initial wind speed is set to 2 m / s and then fluctuates around this value. By observing the uniform distribution of the generated velocity heat map, the initial wind speed is finally determined to be 1.2 m / s. This stage outputs the velocity field and pressure field for the initial wind speed of 1.2 m / s, and provides a wind speed distribution map near the skin surface, providing boundary conditions for subsequent steady-state thermal flow field simulations.

[0057] S4, based on the steady-state wind speed distribution, simulates the steady-state thermal flow field of the body surface thermal management suspension wearable device and outputs a fixed power density of a constant heat source;

[0058] like Figure 7 As shown in the figure, based on the above wind flow simulation output results, the steady-state wind speed distribution is used as the internal circulation convection condition of the cavity when the heat conduction module diffuses heat, and the thermal flow field simulation in the cavity is started. The size of the ambient temperature in this figure is reflected by the color of the thermal map. In the model, the metal heating layer 9 (aluminum) area is set as a constant heat source with a fixed power density of 5000–8000W / m 2 , simulating its continuous heating state; the air portion is defined as a forced convection heat transfer area, with the skin surface set as a constant temperature boundary (32–35°C) to simulate human thermal equilibrium conditions; the device's external environment 19 outer wall is set as an open boundary, and the upstream temperature is set to 20°C. Heat flow simulation not only reveals the efficiency of air heating but also directly affects the subsequent sweat evaporation rate. Therefore, heat flow simulation is a core intermediary for the performance of thermal management systems, ensuring that the cavity temperature is uniformly and stably transferred to the skin.

[0059] S5, using the simulation results of the steady-state wind flow field and the steady-state thermal flow field as initial conditions, a transient simulation of the entire wind-heat fluid flow field is performed;

[0060] Select "Non-isothermal flow" - "Turbulence, k-ω" in the COMSOL physical field selection, that is, set up the "Solid and fluid heat transfer" and "Turbulence, k-ω" modules in the "Model development period", and set the same simulation parameters as the wind flow field and thermal flow field. Figure 8 As shown in the figure, the direction of the arrow indicates the direction of fluid flow at the current position, the color of the arrow indicates the speed of fluid flow at the current position, and the background color indicates the temperature at the current position.

[0061] In the transient simulation settings of the hydrothermal flow field, the time range is set to 0–600 s, with an initial step size of 0.1 s, which is automatically increased to 1 s later to balance accuracy and computational cost. The initial conditions are a steady-state wind speed distribution (2 m / s), a constant power setting in the heating zone (6000 W / m 2) and simulated a cold start from the moment the cavity opened to the target temperature (maintaining the skin surface at approximately 33°C). The air inlet temperature was set to 20°C. The transient analysis focused on tracking the wind speed ramp in the cavity, the uniformity of heat transfer, the delayed response of heat transfer to the skin, and the rapid accumulation and gradual dissipation of evaporated water vapor concentration within the first 200 seconds.

[0062] During this simulation, time series isosurfaces and cross-sectional plots of the wind speed, temperature, and water vapor concentration fields are generated. Dynamic trajectories of skin surface temperature rise time, local maximum temperature rise points, wind speed mutation intervals, and cavity moisture accumulation areas are extracted. This method effectively identifies thermal hysteresis, wind speed instability, or moisture backflow that may occur during the initial heating phase of the device. This guides optimization of air vent design and heating strategies, ensuring a smooth and comfortable treatment experience for skin disease patients even during the initial treatment phase.

[0063] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0064] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A wind-heat-fluid-flow coupling simulation method based on a body surface thermal management suspension wearable device, characterized in that: The body surface thermal management suspension wearable device comprises an annular bladeless fan (2) sleeved on the outside of the body surface, a heating sleeve (6) being coaxially arranged at one end of the annular bladeless fan (2); a fan air inlet (3) being arranged on one side of the annular bladeless fan (2), a wind flow inlet (4) being formed between the annular bladeless fan (2) and the body surface, and a fan air outlet (11) being arranged in the annular bladeless fan (2); when the annular bladeless fan (2) is started, gas is sent from the fan air inlet (3) to the fan air outlet (11) to form a low-pressure area, and ambient air is attracted to enter from the wind flow inlet (4) by relying on the Bernoulli effect, thereby forming an enhanced airflow; The simulation method comprises the following steps: S1, build the geometric model of the body surface thermal management suspension wearable device in the geometry panel of COMSOL software; S2, setting the material properties of the body surface thermal management suspension wearable device; S3, simulate the steady-state wind flow field of the body surface thermal management suspension wearable device and output the steady-state wind speed distribution; S4, based on the steady-state wind speed distribution, simulates the steady-state thermal flow field of the body surface thermal management suspension wearable device and outputs a fixed power density of a constant heat source; S5, using the simulation results of the steady-state wind flow field and the steady-state thermal flow field as initial conditions, a transient simulation of the entire wind-heat fluid flow field is performed.

2. The wind-heat-fluid-flow coupling simulation method based on the body surface thermal management suspension wearable device according to claim 1 is characterized in that: The heating sleeve (6) comprises a three-layer structure, which comprises, from the outside to the inside, a thermal insulation and waterproof layer (8), a metal heating layer (9), and an insulating protective layer (10).

3. The wind-heat-fluid-flow coupling simulation method based on the body surface thermal management suspension wearable device according to claim 2 is characterized in that: In S1, the geometric model includes: a human body (1), an external environment of the device (19), an air flow outlet (7), a thermal insulation and waterproof layer (8), a metal heating layer (9), and a fan outlet (11); after the wind comes out of the air flow outlet (7), it passes through the human body (1) and reaches the fan outlet (11).

4. The wind-heat-fluid-flow coupled simulation method based on the body surface thermal management suspension wearable device according to claim 3 is characterized in that: In S2, the constant pressure heat capacity given to the human body (1) is 3391 J / (kg×K) and the density is 1109 kg / m 3 , thermal conductivity is 0.37W / (m×K); Assign the external environment (19) and internal environment of the device the Air material in the COMSOL material library; The thermal insulation and waterproof layer (8) and the metal heating layer (9) are given a thickness of 0.8 mm, a constant pressure heat capacity of 1700 J / (kg×K), and a density of 1150 kg / m 3 , thermal conductivity is 0.28W / (m×K), and the grid unit is 2.

5. The wind-heat-fluid-flow coupling simulation method based on the body surface thermal management suspension wearable device according to claim 3 is characterized in that: During the steady-state wind flow field simulation process, the outer wall of the device's external environment (19) is set as an open boundary with no positive stress; the boundary portion of the fan outlet (11) is set as a velocity inlet, the initial wind speed is set to 2 m / s, and the value is floated above and below, and the initial wind speed is determined by observing whether the generated velocity heat map is evenly distributed; the velocity field and pressure field at the initial wind speed are output, and a distribution map of the wind speed near the skin surface is provided.

6. The wind-heat-fluid-flow coupled simulation method based on the body surface thermal management suspension wearable device according to claim 5 is characterized in that: In the steady-state thermal flow field simulation process, based on the wind flow field simulation output results, the steady-state wind speed distribution is used as the velocity boundary condition to start the thermal flow field simulation in the cavity; the metal heating layer (9) is used as a constant heat source with a fixed power density of 5000–8000 W / m 2 , simulating its continuous heating state; the air part is defined as the forced convection heat transfer area, and the skin surface is set as a constant temperature boundary to simulate the thermal balance conditions of the human body.

7. The wind-heat-fluid-flow coupled simulation method based on the body surface thermal management suspension wearable device according to claim 6 is characterized in that: In the transient simulation settings of the wind-heat fluid flow field, the time range is set to 0–600 s, with an initial step size of 0.1 s, which is automatically increased to 1 s later. The initial conditions use a steady-state wind speed distribution and a fixed power density of a constant heat source, and simulate a cold start to the target temperature at the moment the cavity is opened. The air inlet temperature is set to 20°C. The wind speed ramp curve in the cavity, the uniformity of heat conduction, the delayed response of heat conduction to the skin, and the accumulation and dissipation process of evaporated water vapor concentration in the first 200 s are tracked.

8. The wind-heat-fluid-flow coupling simulation method based on the body surface thermal management suspension wearable device according to claim 1 is characterized in that: The shell of the annular bladeless fan (2) is a double-layer structure, and a gap is provided at one end of the double-layer structure away from the air inlet (4) to form a fan outlet (11).

9. The wind-heat-fluid-flow coupling simulation method based on the body surface thermal management suspension wearable device according to claim 1 is characterized in that: The annular bladeless fan (2) comprises: an air compressor (12), a main control module (14), a fan drive module (15) and a heating control module (16); the main control module (14) controls the fan drive module (15) and the heating control module (16) to start and stop the annular bladeless fan (2) and the heating jacket (6) respectively.

10. The wind-heat-fluid-flow coupling simulation method based on the body surface thermal management suspension wearable device according to claim 1 is characterized in that: The thermal insulation and waterproof layer (8) is made of rubber-plastic thermal insulation material, the metal heating layer (9) is made of aluminum, and the insulating protective layer (10) is made of silicone rubber.

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