CN104443072A - Flow guiding plate designing method and flow guiding plate structure designed with the same - Google Patents

Abstract

The invention discloses a method for designing a deflector, which includes the following steps: determining the preliminary structure of the deflector according to the shape and structure of the grille at the front end of the vehicle cabin and the deviation between the cooling module and the grille in the forward projection position, The preliminary structure includes at least the shape, quantity, and arrangement position of the deflector; according to the airflow return path in the engine compartment of the vehicle at idling speed or low speed, adjust the preliminary structure and determine the assembly position of the deflector to block the airflow return path ; Optimize the deflector so that the cooling air volume of the cooling module meets the requirements of the vehicle cooling system; optimize the layout between the deflector and the cooling module to reduce the aerodynamic resistance in the vehicle cabin. The invention also discloses a deflector structure designed by the above design method of the deflector. Implementing the deflector design method of the present invention and the deflector structure designed by the design method can prevent backflow of hot gas, increase the intake air volume of the cooling module, and reduce aerodynamic resistance.

Description

A design method of deflector and the structure of deflector designed by the design method

technical field

The invention relates to the field of heat management of a complete automobile, in particular to a design method of a deflector and a structure of the deflector designed by the design method.

Background technique

Vehicle thermal management and aerodynamic performance are one of the most important performances of automobiles, which are related to automobile driving reliability, economy and power performance, and are important technical problems in the process of automobile development. In the process of automobile design, unreasonable design of the front end of the cabin may easily cause idling backflow, leakage and turbulent flow, resulting in low thermal efficiency of subsystems, heat accumulation or overcooling in the cabin, affecting the performance and life of the vehicle; at the same time, the optimization of aerodynamic performance It is an important way to reduce vehicle resistance and reduce fuel consumption.

In the prior art, whether the design of the front-end components of the car (such as the front bumper, grille, front-end deflector, front-end module, etc.) is reasonable directly affects the thermal management performance of the car engine compartment. During the design and development process of most new car models, hot air backflow caused by unreasonable front-end component design is a common problem. Among them: hot air backflow means that when the vehicle (generally front-wheel drive) enters the idling or low-speed working condition after high-load work, at this time only the fan in the engine compartment performs forced convection, affected by the structure of the engine compartment, the air blown out by the fan The hot air easily flows back to the front side of the cooling module through various gaps in the front end, so that the inlet temperature of the front side of the cooling module rises and the cooling efficiency decreases.

The deflector is one of the important structures for isolating the backflow of hot air in the prior art, and it can alleviate the above-mentioned problem of backflow of hot air to a certain extent while playing the role of flow guide. However, the deflector designed by the existing deflector design method has the following technical problems:

a. The cooling air volume of the cooling module (condenser, radiator, intercooler) cannot be increased, and the efficiency of the cooling system is not high;

b. Failure to use the rectification effect to reduce the aerodynamic resistance of the vehicle;

c. The design structure is complex and the cost is relatively high. Therefore, it is necessary to propose a design method of the deflector, so that the designed deflector can solve the above-mentioned problems.

Contents of the invention

The technical problem to be solved by the present invention is to provide a deflector design method and a deflector structure designed by the design method, which can prevent the backflow of hot air, increase the air intake of the cooling module, and reduce aerodynamic resistance.

In order to solve the above technical problems, an embodiment of the present invention provides a method for designing a deflector, including the following steps:

Step S1, according to the shape and structure of the grille at the front end of the vehicle cabin and the deviation between the cooling module and the grille in the forward projection position, determine the preliminary structure of the deflector. The preliminary structure includes at least the shape, quantity and arrangement of the deflector position, which includes: step S11, adjusting the structure of the deflector according to the shape of the front grille of the vehicle cabin, so that it fits the extension of the grille; step S12, when the grille is two air intakes with upper and lower openings In the case of a grid structure or an integrated grid structure, use a single deflector; or step S13, when the grid has a third grid, confirm whether to set a deflector according to the design purpose of the third grid; step S2, Adjust the preliminary structure and determine the assembly position of the deflector according to the return flow path of the airflow in the engine room under the idling or low-speed working conditions of the vehicle, so as to block the return flow path of the airflow, which includes: step S21, setting the deflector in the engine room The airflow is blocked on the airflow return path, so that the airflow cannot return to the front side of the cooling module or a front-end module loaded with the cooling module along the original flow path; step S3, optimize the deflector, so that the cooling air volume of the cooling module To meet the requirements of the vehicle cooling system, it includes: step S31, setting the radian of the edge of the deflector to be consistent with the radian of the grille, so that the gap between the deflector and the grille is uniform; step S4, optimizing the deflector The layout between the plate and the cooling module is to reduce the aerodynamic resistance in the vehicle engine room, which includes: step S41, on the premise of meeting the air volume requirements of the cooling module, reduce the inclination angle of the deflector to reduce the air flow caused by the inside of the vehicle engine room. resistance, wherein: the inclination angle of the deflector is the angle between the deflector and the windward side of the cooling module.

Wherein, step S12 includes: step S121, when the grille has two air intake structures with upper and lower openings, and there is no space for arrangement between the two grilles, two guides are used at the openings of the upper and lower grilles respectively. Flow board.

Among them, step S1 includes: step S14, when there is a deviation in the vertical direction of the ground between the cooling module and the grid in the forward projection position, the deflector is set as a structure for guiding the flow up and down; or step S15, the cooling module and the grid are in the positive When there is a deviation in the direction parallel to the ground at the projected position, the deflector is set as a left-right guide structure; where: the forward projected position is the direction of the intersection line between the plane parallel to the ground and the center plane of the vehicle.

Among them, step S2 also includes: step S22, on the basis of ensuring the normal function of the vehicle engine room components and the space for assembly and disassembly, controlling the gap between the deflector and the front-end module, so as to prevent the airflow of the vehicle from flowing to the cooling system at high speed. both sides of the module.

Wherein, the gap between the deflector and the cooling module is less than or equal to 10mm.

Wherein, step S3 also includes: step S32, when the opening of the grille is large, reduce the inclination angle of the deflector to reduce the airflow entering the cooling module from the grille; or step S33, when the opening of the grille is small When the modules do not match, increase the inclination angle of the deflector to improve the airflow from the grille into the cooling module.

Wherein, step S3 further includes: step S34, after the inclination angle of the deflector is determined, the grille is bounded by the deflector until its edge is partially closed to reduce the drag coefficient.

Wherein, step S4 further includes: step S42, reducing the gap between the deflector and the components that have a matching relationship with it.

Wherein, step S4 also includes: step S43, attaching the deflector to the edge of the grille, so that all the airflow entering the cabin of the vehicle from the grille flows through the cooling module; or, step S44, attaching the deflector to the edge of the vehicle The openings in the cabin fenders cooperate to direct airflow out of the vehicle cabin.

The invention also discloses a deflector structure designed by the above-mentioned deflector design method, including a demoulding angle for arranging vehicle mold waterways and ejection mechanisms, and the demoulding angle is greater than or equal to 3°.

Among them, reinforcing ribs are designed on the non-airflow surface on the back of the deflector, and a rotating clamping structure and a positioning structure are provided at many places of the deflector.

The deflector design method provided by the present invention and the deflector structure designed by the design method have the following beneficial effects:

First, when the vehicle is idling or at low speed, the hot air blown from the fan in the engine compartment of the vehicle will flow back to the front side of the front-end module. The designed deflector can block the path of the air flow to the front-end module, so that Hot air cannot be drawn by the fan.

Second, under the high-speed working condition of the vehicle, the cooling airflow entering from the grille is guided by the designed deflector, which increases the airflow velocity and increases the air volume of the cooling module.

Third, under high-speed working conditions, the airflow entering the grille is guided by the designed deflector and forced to pass through the cooling module, thereby avoiding the formation of vortices from the left and right sides to the rear of the cabin and increasing the aerodynamic internal resistance, thus Play a role in reducing the drag coefficient.

Fourth, the structure is stable and can avoid vibration and noise; the assembly is convenient and the cost is easy to control.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a flow chart of a method for designing a deflector according to an embodiment of the present invention.

Fig. 2 is a schematic exploded view of the layout of the main components inside the vehicle cabin in the design method of the deflector according to the embodiment of the present invention.

Fig. 3 is a top view structural diagram of the main parts inside the vehicle cabin in the design method of the deflector according to the embodiment of the present invention.

Fig. 4 is a schematic diagram of the elevation structure of the deflector structure according to the embodiment of the present invention.

Fig. 5 is a front structural schematic view of the deflector structure of the embodiment of the present invention.

Fig. 6 is a schematic rear view of the structure of the deflector according to the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Referring to Fig. 1-Fig. 3 in combination, it is Embodiment 1 of the design method of the deflector of the present invention. The deflector design method in the present embodiment comprises the following steps:

Step S1, according to the shape and structure of the grille at the front end of the vehicle cabin and the deviation between the cooling module and the grille in the forward projection position, determine the preliminary structure of the deflector. Among them: the preliminary structure includes at least the shape, quantity and arrangement position of the deflector;

Step S2, adjusting the preliminary structure and determining the assembly position of the deflector according to the airflow return path in the engine room under the idling or low speed condition of the vehicle, so as to block the airflow return path;

Step S3, optimizing the deflector so that the cooling air volume of the cooling module meets the requirements of the vehicle cooling system;

Step S4, optimizing the layout between the deflector and the cooling module, so as to reduce the aerodynamic resistance in the engine compartment of the vehicle.

FIG. 2 is a schematic diagram showing the blasted layout of the main parts inside the vehicle cabin in the design method of the deflector in this embodiment, which specifically includes: a front-end module 2 , a cooling module 3 , a grille 4 , a fan 5 and a deflector 1 . Due to the matching requirements of the deflector 1, the front-end module 2, the cooling module 3 and the grille 4, when the shape and structure of the grille 4 and the arrangement of the cooling module 3 are adjusted, it will cause changes in the air flow in the cabin. The change requires adjustments to the structure of the deflector 1 . Designing the preliminary structure of the deflector 1 specifically includes the following steps:

Step S11 , adjust the structure of the deflector according to the shape of the grille at the front end of the vehicle cabin, so that it fits the extension of the grille 4 more closely. The matching degree of the deflector 1 and the grille 4 after the assembly is completed affects the gap between them, and also affects the air flow introduced into the cooling module 3 through the opening of the grille 4. By designing the direction of the deflector 1 to be closer The extension of the grid 4 can maximize the flow guiding function of the deflector 1 .

Step S12, when the grille has two air intake structures with upper and lower openings or an integrated grille structure, a single deflector is used;

Step S121, when the grille has two air intake structures with upper and lower openings, and there is no arrangement space between the two grilles, two deflectors are used at the openings of the upper and lower grilles respectively. or

Step S13, when the grille has a third grille, it is confirmed whether a deflector is provided according to the design purpose of the third grille.

The functions of the above steps are: since the design of the grille 4 is usually greatly influenced by the exterior shape of the vehicle, the shape of the grille 4 may not be a regular structure; It is also very large, if the deflector 1 is designed as a relatively complicated structure, it may cause the problem of insufficient layout space.

In a preferred embodiment: Step S1 includes:

Step S14, when the cooling module 3 and the grille 4 have a deviation in the vertical direction on the forward projection position, the deflector 1 is set as a structure for guiding the flow up and down; or

Step S15, when there is a deviation between the cooling module 3 and the grille 4 in the direction parallel to the ground in the forward projection position, the deflector 1 is set as a left and right flow guide structure; wherein: the forward projection position is a plane parallel to the ground and the vehicle The direction of intersection of the center planes.

The functions of the above steps are: due to the arrangement coordination requirements among the front bumper, the grille 4 and the front-end module 2, and the front-end module 2 is usually restricted by the layout of the cabin (such as collision safety requirements, the arrangement position of the front-end module 2 is restricted. restrictions), the positions of the cooling module 3 installed in the front-end module 2 and the grille 4 deviate in the forward projection (that is, the direction of the intersection line between the plane parallel to the ground and the center plane of the vehicle). The arrangement of the deflector 1 is mainly determined according to the deviation, so as to realize the deflecting effect and increase the intake air volume of the cooling module. If there is a deviation in the vertical direction of the ground, it is necessary to arrange the deflector at the upper and lower ends of the front module 2 or the grille 4 and the bumper, and the upper and lower diversion structure is used to realize the diversion effect and increase the air intake of the cooling module quantity.

Further, step S2 in this embodiment includes:

Step S21 , setting the deflector on the return flow path of the airflow in the cabin to block the airflow, so that the airflow cannot return to the front side of the cooling module or a front-end module loaded with the cooling module along the original flow path.

During design, since idling backflow is one of the main design objectives of the deflector 1 , the structure of the deflector 1 must be determined according to the backflow. The backflow is mainly generated through the surroundings of the front-end module 2 or the gap between the front-end module 2 and the cooling module 3 . In order to prevent backflow, the deflector 1 must realize the function of blocking the path of backflow of airflow.

For specific implementation, please refer to Figure 2. When the vehicle enters the idling or low-speed working condition after high-load operation, the fan 5 in the engine compartment is mainly for forced convection, and the direction of the air flow is T. According to the backflow in the flow field Path design, the deflector 1 is set on the return path of the airflow in the cabin to block the airflow, so that the airflow cannot return to the front side of the cooling module 3 or the front-end module 2 along the original flow path. In a preferred embodiment, please refer to FIG. 3 , which is a schematic diagram of the top view of the main components inside the vehicle cabin in the design method of the deflector in this embodiment, wherein: step S2 also includes:

Step S22, on the basis of ensuring the normal functions of the vehicle engine compartment components and the assembly and disassembly space, controlling the gap between the deflector and the cooling module 3, so as to prevent the airflow of the vehicle from flowing to both sides of the cooling module at high speed.

In this step: since the structural design optimization of the deflector 1 should be aimed at the backflow situation, the structure of the deflector should be optimized on the premise of satisfying the engineering feasibility of the product manufacturing process and assembly process. During specific implementation, since there are components such as air-conditioning pipelines, headlight harnesses, and mounting brackets at the front of the cabin, in order to ensure the normal functions of these components and the space for assembly and disassembly, there must be a design gap between the deflector 1 and it. However, the design gap will directly affect the effect of the deflector 1, so it must be effectively controlled.

Preferably, the gap f between the deflector 1 and the cooling module 3 (the gap between the deflector 1 and the condenser 30 at the front end of the cooling module 3) is less than or equal to 10 mm, because the deflector 1 and the cooling module The design clearance of 3 has the greatest impact on preventing backflow, and the design value should be as small as possible.

Further, step S3 in this embodiment includes:

Step S31 , setting the radian of the edge of the deflector to be consistent with the radian of the shape of the grid, so that the gap h between the deflector and the grid is uniform.

Step S32, when the opening of the grille is large, reduce the inclination angle of the deflector to reduce the airflow entering the cooling module from the grille; or

Step S33, when the opening of the grille is small or does not match the cooling module, increase the inclination angle of the deflector to increase the air flow from the grille into the cooling module; The angle of the face.

The functions of the above steps are: in order to realize the flow guiding function of the deflector 1 , it is necessary to control the inclination β of the deflector 1 and the matching relationship between the deflector 1 and the grid 4 . Due to consideration of shape factors in the design of the grid 4 , its opening size and arrangement position may not completely match with the cooling module 3 . The air guide design of the air deflector 1 is to enable the cooling air flow through the opening of the grille 4 to be introduced into the cooling module 3 . Therefore, it is necessary to adjust the inclination angle β of the deflector according to the radian, size and arrangement of the grid 4 . Wherein: the inclination angle β of the deflector refers to the angle between the deflector 1 and the windward surface 3 a of the cooling module 3 .

Specifically, the radian of the edge of deflector 1 is consistent with the shape of grille 4 to ensure a uniform matching gap and smooth airflow; when the opening of grille 4 is large, in order to optimize the aerodynamic performance of the vehicle, the cooling module must Under the premise of air volume requirements, the inclination angle β of the deflector can be reduced to reduce the airflow entering the cooling module 3 from the grille 4; when the opening of the grille 4 is small or does not match the cooling module 3, the deflector can be used 1 diversion effect, increase the inclination angle β of the deflector, and increase the cooling air volume.

In a preferred embodiment: step S3 also includes:

In step S34, after the inclination angle of the deflector is determined, the grille is closed with the deflector as a boundary until its edge, so as to reduce the drag coefficient.

During implementation, the cooling air volume of the cooling module 3 can be determined according to the requirements of the cooling system. By adjusting the angle of inclination β, the cooling air volume can meet the requirement. Usually in order to reduce the drag coefficient, after the inclination β is determined according to the cooling air volume, the grille 4 will be closed with the deflector 1 as the boundary to the edge, as shown in part A in Figure 3.

As shown in Table 1 below, it is an example of the influence of the change of the inclination angle of a vehicle on the cooling flow rate. It can be seen from Table 1 that when the vehicle is operating at high speed, the cooling airflow entering from the grille 4 passes through the guiding effect of the deflector 1, and the airflow velocity increases. , the air volume of the cooling module increases; and under high-speed operating conditions, the airflow entering the grille 4 is guided by the deflector 1 and forced to pass through the cooling module 3, which can reduce the drag coefficient.

Table 1 - The influence of the inclination angle change of a vehicle on the cooling flow rate

Further, step S4 in this embodiment includes:

Step S41, on the premise of meeting the air volume requirements of the cooling module, reduce the inclination angle of the deflector to reduce the resistance caused by the interior of the vehicle cabin, wherein: the inclination angle of the deflector is the clip between the deflector and the windward surface of the cooling module horn. In this step, the grille is closed by reducing the inclination angle β as much as possible, thereby reducing the resistance caused by the interior of the nacelle, that is, reducing the inclination angle β of the deflector can reduce the positive pressure acting on the deflector 1, thereby reducing the aerodynamic resistance .

Step S42, reducing the gap between the deflector and the components that have a matching relationship with it. At this time, due to the large gap, there is leakage in the cabin, and the leakage will easily develop into turbulent airflow, resulting in increased aerodynamic resistance; reducing the design gap can make the high-speed airflow pass through the cooling module as much as possible without flowing to the surroundings to form a vortex. This reduces the aerodynamic internal resistance.

Likewise, as a preferred embodiment: step S4 also includes:

Step S43, attaching the deflector to the edge of the grille, so that all the airflow entering the cabin of the vehicle from the grille flows through the cooling module. In this step, the deflector 1 is used to force the airflow to pass through the cooling module 3; or ,

In step S44, the deflector cooperates with the opening at the fender of the vehicle cabin to guide the airflow out of the vehicle cabin.

The function of step S4 is to optimize the arrangement of the deflector 1 and the cooling module 3, so as to realize the function of reducing the aerodynamic resistance of the deflector 1, which is mainly to optimize the relationship between the deflector 1 and various components that have a cooperative relationship. The optimization of the gap, the inclination angle of the deflector, and the structure is essentially to change the air flow in the cabin by adjusting the above parameters. The purpose of the rectification optimization design is to reduce the aerodynamic resistance.

The deflector designed according to the design method of the deflector in this embodiment can meet the function of preventing the backflow of hot air under the idling condition, increase the cooling air volume of the cooling module, and at the same time have the function of reducing the aerodynamic resistance of the vehicle. In addition, on this basis, it is necessary to carry out detailed structural design of the deflector, such as: manufacturing process, strength, assembly, etc. To ensure that the deflector can meet the design function. The detailed structure of the deflector designed according to the design method of the above deflector is given below.

Please refer to Fig. 4, which is a schematic diagram of the facade structure of the deflector structure according to the embodiment of the present invention. The lateral section of the deflector designed by the above-mentioned design method is L-shaped, and the deflector is designed with a demoulding angle not less than 3° , The spatial structure of the mold cooling waterway and the ejector mechanism can be arranged.

During implementation, in order to meet its strength, design reinforcing ribs 11 and increase characteristic surfaces on the non-airflow surface at the back of the deflector. The upper and lower deflectors are designed with a swivel clamping structure 12 to ensure product strength and avoid excessive swing and vibration noise due to airflow.

Please refer to Fig. 5 and Fig. 6, which are schematic diagrams of the structure of the deflector according to the embodiment of the present invention. During implementation, in order to meet the assembly requirements, the deflector is designed with a positioning structure to ensure that its actual assembly position meets the design requirements. , the positioning structure includes the main positioning hole 13a and the auxiliary positioning hole 13b in the figure.

The deflector design method of the present invention and the deflector structure designed by the design method have the following beneficial effects:

First, when the vehicle is idling or at low speed, the hot air blown from the fan in the engine compartment of the vehicle will flow back to the front side of the front-end module. The designed deflector can block the path of the air flow to the front-end module, so that Hot air cannot be drawn by the fan.

Second, under the high-speed working condition of the vehicle, the cooling airflow entering from the grille is guided by the designed deflector, which increases the airflow velocity and increases the air volume of the cooling module.

Third, under high-speed working conditions, the airflow entering the grille is guided by the designed deflector and forced to pass through the cooling module, thereby avoiding the formation of vortices from the left and right sides to the rear of the cabin and increasing the aerodynamic internal resistance, thus Play a role in reducing the drag coefficient.

Fourth, the structure is stable and can avoid vibration and noise; the assembly is convenient and the cost is easy to control.

Claims (11)

1. A design method of a guide plate is characterized by comprising the following steps:

step S1, according to the modeling and structure of the front grille of the vehicle cabin and the deviation condition of the cooling module and the grille on the forward projection position, determining the preliminary structure of the guide plate, wherein the preliminary structure at least comprises the shape, the number and the arrangement position of the guide plate, and the preliminary structure comprises: step S11, adjusting the structure of the guide plate according to the shape of the front end grid of the vehicle cabin to enable the guide plate to be more attached to the extension of the grid; step S12, when the grid is an upper and lower open type two air inlet structure or an integrated grid structure, a single guide plate is adopted; or step S13, when the grid is provided with a third grid, whether a guide plate is arranged is confirmed according to the design purpose of the third grid;

step S2, according to the airflow backflow path in the cabin of the vehicle under idle or low speed conditions, adjusting the preliminary structure and determining the assembly position of the baffle plate to block the airflow backflow path, including: step S21, disposing the air deflector on an airflow return path in the cabin to obstruct the airflow, so that the airflow cannot return to the front side of the cooling module or a front module loaded with the cooling module along the original flow path;

step S3, optimizing the air deflector to make the cooling air volume of the cooling module meet the requirement of the vehicle cooling system, which includes: step S31, setting the edge radian of the guide plate and the modeling radian of the grating to be consistent so as to enable the gap between the guide plate and the grating to be uniform;

step S4, optimizing the layout between the baffle and the cooling module to reduce aerodynamic drag within the vehicle cabin, comprising: step S41, on the premise of meeting the air volume requirement of the cooling module, reducing the inclination angle of the air deflector to reduce the resistance caused by the interior of the vehicle cabin, wherein: the inclination angle of the guide plate is the included angle between the guide plate and the windward side of the cooling module.

2. The baffle design method of claim 1 wherein said step S12 comprises: and S121, when the grids are two air inlet structures with an upper opening and a lower opening and no arrangement space exists between the two grids, two guide plates are adopted corresponding to the openings of the upper grid and the lower grid respectively.

3. The baffle design method of claim 1 or 2, wherein the step S1 further comprises:

step S14, when the cooling module and the grating have deviation in the direction vertical to the ground on the forward projection position, the guide plate is set to be in a structure of guiding the flow up and down; or

Step S15, when the cooling module and the grating have deviation in the direction parallel to the ground on the forward projection position, the guide plate is set to be in a left-right flow guide structure;

wherein: the forward projection position is the direction of an intersection line of a plane parallel to the ground and a vehicle central plane.

4. The baffle design method of claim 1 or 2, wherein the step S2 further comprises:

and step S22, controlling the gap between the guide plate and the front end module on the basis of ensuring the normal function and the assembling and disassembling space of the parts of the vehicle cabin, so that the air flow of the vehicle at high speed does not flow to the two sides of the cooling module.

5. The baffle design method of claim 1 wherein a gap between the baffle and the cooling module is less than or equal to 10 mm.

6. The baffle design method of claim 1, wherein said step S3 further comprises:

step S32, when the opening of the grid is larger, reducing the inclination angle of the guide plate to reduce the airflow entering the cooling module from the grid; or

Step S33, when the grille opening is smaller or not matched with the cooling module, increasing the inclination angle of the deflector to increase the airflow entering the cooling module from the grille.

7. The baffle design method of claim 6, wherein said step S3 further comprises:

and step S34, after the inclination angle of the guide plate is determined, the grid is closed by taking the guide plate as a boundary until the edge of the grid is closed so as to reduce the wind resistance coefficient.

8. The baffle design method of claim 1, wherein said step S4 further comprises:

and step S42, reducing the gap between the guide plate and the parts in the matching relationship with the guide plate.

9. The baffle design method of claim 8 wherein said step S4 further comprises:

step S43, attaching the guide plate to the edge of the grille to make the airflow entering the vehicle cabin from the grille flow through the cooling module; or,

and step S44, the guide plate is matched with the opening at the fender of the vehicle cabin and used for guiding the airflow out of the vehicle cabin.

10. A baffle structure designed by the baffle design method of any one of claims 1-9, wherein the baffle comprises a de-molding angle for arranging a vehicle mold waterway and an ejection mechanism, wherein the de-molding angle is greater than or equal to 3 °.

11. The baffle structure of claim 10 wherein the non-airflow surface of the back of the baffle is configured with ribs and the baffle is configured with a plurality of convoluted retaining structures and positioning structures.