Vehicle drag reduction structure, drag reduction method and vehicle thereof

Abstract

The present application belongs to the field of vehicle drag reduction technology, and particularly relates to a vehicle drag reduction structure, a drag reduction method and a vehicle, wherein the vehicle drag reduction structure comprises a self-sustaining synthetic jet device arranged on the vehicle; an inlet of the self-sustaining synthetic jet device flows in air in front of and / or below the vehicle, so as to allow the air flow to enter the self-sustaining synthetic jet device and simultaneously suck away the low-speed air in front of and / or below the vehicle; and an outlet of the self-sustaining synthetic jet device sprays the air jet from the roof of the vehicle, so as to inject the high-energy air flow into the roof of the vehicle and suppress the flow separation at the roof of the vehicle. The present vehicle drag reduction structure fully utilizes the air flow, improves the air energy utilization rate, improves the drag reduction effect through the air flow inflow and air jet ejection, and has simple arrangement and low cost.

Description

Technical Field

[0001] This invention belongs to the field of vehicle drag reduction technology, specifically relating to a vehicle drag reduction structure, a drag reduction method, and a vehicle thereof. Background Technology

[0002] As automobiles become increasingly widespread, automakers are focusing on reducing drag during driving to improve vehicle performance and fuel economy, especially for new energy vehicles. The drag experienced by a car during driving is mainly divided into rolling drag and air resistance, with air resistance being the primary drag at high speeds. When airflow passes over a car, vortices are generated at points on the car's surface where the airflow velocity changes drastically. These vortex areas create negative pressure, while the front and upper front of the car experiences positive pressure. Therefore, the drag caused by these vortices is pressure drag. Currently, the main methods for reducing drag in automobiles are through streamlined body design and styling of specific areas. However, due to the maturing of related technologies and the influence of aesthetic considerations, the potential for improvement through streamlined body design and styling of specific areas is increasingly limited, offering very limited effectiveness in reducing the front-to-rear and vertical pressure differences of a car. It is necessary to break through this bottleneck.

[0003] Meanwhile, in order to save energy and reduce emissions, new energy vehicles, mainly pure electric vehicles, have begun to be vigorously promoted. However, new energy vehicles do not need to have air intakes or grilles at the front or bottom of the vehicle to allow air to enter and be ignited by the engine, resulting in insufficient utilization of the incoming airflow and energy during vehicle operation.

[0004] Moreover, taking the Chinese patent application "CN104960585A-Method and System for Active Drag Reduction Control of Automobile Based on Jet Exciter" as an example, it reduces drag by arranging multiple exciters on the surface of the automobile and spraying jets on the surface. This method does not utilize the incoming airflow, resulting in low energy utilization. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a vehicle drag reduction structure, drag reduction method and vehicle thereof that utilizes incoming airflow to reduce the air resistance of automobiles.

[0006] This invention provides a vehicle drag reduction structure, including a self-sustaining synthetic jet device disposed on a vehicle;

[0007] The inlet of the self-sustaining synthetic jet device allows air to flow into the front and / or bottom of the vehicle, so as to allow airflow to enter the self-sustaining synthetic jet device while simultaneously sucking up low-speed air in front of and / or bottom of the vehicle.

[0008] The outlet of the self-sustaining synthetic jet device sprays an air jet from the roof of the vehicle to inject high-energy air fluid into the roof of the vehicle and suppress flow separation at the roof of the vehicle.

[0009] Furthermore, an air intake is provided at the front and / or bottom of the vehicle, and the inlet is connected to the air intake through an air guide structure.

[0010] Furthermore, the air guiding structure is an air guiding pipe.

[0011] Furthermore, the vehicle's drag-reducing structure also includes an air conditioning system located between the inlet and the air intake.

[0012] Furthermore, the self-sustaining synthetic jet device is provided in several units;

[0013] Several air intakes are arranged in an array at the front of the vehicle along the width and / or height direction, and / or several air intakes are arranged in an array at the bottom of the vehicle along the width and / or length direction.

[0014] Several exits are arranged in an array on the roof of the vehicle along the width and / or length of the vehicle.

[0015] Furthermore, the body of the self-sustaining synthetic jet device is arranged inside the roof of the vehicle, and the outlet is provided through the roof of the vehicle.

[0016] Furthermore, the self-sustaining synthetic jet device is a self-sustaining synthetic dual jet device.

[0017] Furthermore, the self-sustaining synthetic dual-jet device includes a first cavity plate, a second cavity plate, an outlet plate, a mounting plate, and a vibrating diaphragm; the first cavity plate, the second cavity plate, and the outlet plate together form an internal cavity, the mounting plate divides the internal cavity into a first cavity and a second cavity, and an opening is formed on the mounting plate for mounting the vibrating diaphragm; a first inlet and a first outlet are formed on the outlet plate corresponding to the first cavity; a second inlet and a second outlet are formed on the outlet plate corresponding to the second cavity; the vibrating diaphragm is disposed at the opening of the mounting plate to separate the first cavity and the second cavity.

[0018] The present invention also provides a vehicle drag reduction method, wherein the vehicle, during operation, comprises the following drag reduction steps:

[0019] S1, the airflow flows into the inlet of the self-maintaining synthetic jet device through the front and / or bottom of the vehicle;

[0020] Airflow enters from the front and / or bottom of the vehicle through the inlet of the maintaining synthetic jet device to draw out low-speed air from the front and / or bottom of the vehicle, thereby absorbing low-energy airflow within the boundary layer, suppressing flow separation, and reducing vehicle drag.

[0021] Furthermore, the airflow enters from the front and / or bottom of the vehicle into the inlet of the self-sustaining synthetic jet device, and is also used to inject air into the cavity of the self-sustaining synthetic jet device;

[0022] S2, air jets are injected into the roof of the vehicle through the outlet after the energy and frequency of the air jet are modulated by the vibration of the diaphragm in the cavity of the self-sustaining synthetic jet device.

[0023] Air jets are sprayed from the outlet onto the roof of the vehicle to inject high-energy airflow into the roof, enhancing resistance to flow separation, suppressing the tail section separation zone, and reducing vehicle drag.

[0024] The present invention also provides a vehicle, including the vehicle and the aforementioned vehicle drag reduction structure disposed on the vehicle.

[0025] The beneficial effects of this invention are that the vehicle drag reduction structure combines two methods: drawing in low-speed air from in front of and / or below the vehicle through an inlet, and injecting a high-energy air jet onto the vehicle's roof. This fully utilizes the incoming airflow, improving air energy utilization efficiency, and enhancing drag reduction through both the inflow and outflow of the air jet. Furthermore, it eliminates the need for jet exciters at both the front and top of the vehicle, simplifying the number of jet devices. Moreover, the self-sustaining synthetic jet device fully utilizes the airflow energy during vehicle operation to reduce drag, eliminating the need for additional energy and momentum control inputs. Therefore, no additional air source or energy input is required, further simplifying the device structure.

[0026] In addition, the air jet frequency and air jet intensity of the self-maintaining synthetic jet device are controllable, and the drag reduction effect under different wind speeds and vehicle speeds can be adjusted in real time by adjusting the air jet frequency and air jet intensity. Attached Figure Description

[0027] Appendix Figure 1 This is a schematic diagram of the vehicle drag reduction structure in this invention;

[0028] Appendix Figure 2 This is a schematic diagram of the vehicle structure in this invention.

[0029] In the figure, 1-self-sustaining synthetic jet device; 11-inlet; 12-outlet; 2-vehicle; 21-air inlet; 3-air guide structure. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0035] As attached Figure 1 -Appendix Figure 2As shown, the present invention provides a vehicle drag reduction structure, including a self-sustaining synthetic jet device 1 installed on the vehicle 2. The self-sustaining synthetic jet device is a mature existing product. For details, please refer to the self-sustaining synthetic dual jet exciter structure in Chinese patent application "CN107054673A A self-sustaining synthetic dual jet exciter and supersonic flow control method". It can realize the injection of high-energy air jet at the outlet 12 without the need for external energy injection. It can use the air flow field to maintain itself and has the advantages of small size, easy installation and low cost.

[0036] The inlet 11 of the self-sustaining synthetic jet device 1 receives air flowing into the front and / or below the vehicle 2 to allow air to flow into the self-sustaining synthetic jet device 1, while simultaneously sucking up low-speed air in front of and / or below the vehicle 2.

[0037] On the surface of vehicle 2, due to the adhesion effect, a boundary layer is formed when airflow approaches the surface. The airflow velocity and energy are relatively low here. In this invention, by introducing air in front of and / or below vehicle 2 into inlet 11, on the one hand, the low-speed air at this location can be sucked out, that is, the low-momentum fluid at the bottom of the boundary layer can be sucked out, thereby suppressing flow separation. Suppressing flow separation can effectively reduce air resistance. On the other hand, the air introduced into inlet 11 in front of and / or below vehicle 2 can also reduce the accumulation of low-speed air in front of vehicle 2, change the airflow pattern, and thus reduce air resistance. That is, inlet 11 can both suck out the low-speed air at this location and suppress flow separation, and reduce the positive pressure on the surface where inlet 11 is located, thereby reducing the drag coefficient.

[0038] The outlet 12 of the self-sustaining synthetic jet device 1 sprays an air jet from the roof of the vehicle 2 to inject high-energy air fluid into the roof of the vehicle 2, suppressing flow separation at the roof of the vehicle 2 and further reducing air resistance.

[0039] This vehicle drag reduction structure combines two methods: drawing in low-speed air from in front of and / or below the vehicle 2 through inlet 11, and injecting a high-energy air jet onto the roof of the vehicle 2. This fully utilizes the incoming airflow, improving air energy utilization. The drag reduction effect is enhanced by both the inflow and outflow of the air jet. Furthermore, it eliminates the need for jet exciters at the front and top of the vehicle, simplifying the number of jet devices. Moreover, the self-sustaining synthetic jet device 1 fully utilizes the airflow energy during vehicle movement to reduce drag, eliminating the need for additional energy and momentum control inputs. Therefore, no additional air source or energy input is required, further simplifying the device structure.

[0040] Compared to conventional drag reduction methods that use jet exciters to spray air jets both in front of and above the vehicle (e.g., Chinese patent application CN104960585A - Method and system for active drag reduction control of automobiles based on jet exciters), this drag reduction mechanism is different and makes full use of the incoming flow energy. Furthermore, it can reduce the number of jet devices required.

[0041] In addition, the air jet frequency and air jet intensity of the self-maintaining synthetic jet device 1 are controllable, and thus the drag reduction effect under different wind speeds and vehicle speeds can be adjusted in real time by adjusting the air jet frequency and air jet intensity.

[0042] In one embodiment, an air inlet 21 is provided in front of and / or below the vehicle 2, and the inlet 11 is connected to the air inlet 21 through an air guiding structure 3, thereby guiding the air flow from in front of and / or below the vehicle 2 into the inlet 11 of the self-sustaining synthetic jet device 1.

[0043] In one embodiment, the air intake 21 can be an air intake grille located in front of the vehicle 2, or it can be a guide hole (currently, electric vehicles are generally not equipped with air intake grilles). The air guide structure 3 can also be an air guide channel set on the vehicle frame, or it can be other methods. In one preferred embodiment, the air guide structure 3 is an air guide pipe to improve the air guide effect and simplify the structure of the air guide structure 3.

[0044] In one embodiment, the vehicle drag reduction structure also includes an air conditioning system disposed between the inlet 11 and the air intake 21. That is, the vehicle drag reduction structure is combined with the vehicle's existing air conditioning system. Air enters the air conditioning unit or compressor of the air conditioning system through the air intake 21. Part of the air is used to cool or heat the vehicle interior, and the other part enters the inlet 11 to supply air to the self-sustaining synthetic jet device 1.

[0045] In one embodiment, the self-sustaining synthetic jet device 1 is provided in a plurality of units;

[0046] A plurality of air inlets 21 are arranged in an array at the front of the vehicle 2 along the width and / or height of the vehicle 2, and / or a plurality of air inlets 21 are arranged in an array at the bottom of the vehicle 2 along the width and / or length of the vehicle 2.

[0047] Several outlets 12 are arranged in an array on the roof of vehicle 2 along the width and / or length of vehicle 2. This arrangement can improve drag reduction in the width, height and length directions of vehicle 2.

[0048] In one embodiment, the self-sustaining synthetic jet device 1 is a self-sustaining synthetic dual jet device. The self-sustaining synthetic dual jet device has two cavities, two inlets 11 and two outlets 12, which can improve the utilization rate of the vibrating diaphragm. The two outlets 12 form alternating air jets, which improve the continuity of the air jets and thus improve the drag reduction effect.

[0049] In one embodiment, the body of the self-sustaining synthetic jet device 1 is arranged inside the roof of the vehicle 2, and the outlet 12 is provided through the roof of the vehicle 2. With this arrangement, the body of the self-sustaining synthetic jet device 1 is located inside the vehicle 2, that is, not on the surface of the vehicle 2, which can avoid wind resistance generated by the self-sustaining synthetic jet device 1. At the same time, the vehicle 2 can provide physical protection for the self-sustaining synthetic jet device 1 and improve the service life of the self-sustaining synthetic jet device 1.

[0050] In one specific embodiment, the self-sustaining synthetic dual-jet device includes a first cavity plate, a second cavity plate, an outlet plate, a mounting plate, and a vibrating diaphragm; the first cavity plate, the second cavity plate, and the outlet plate together form an internal cavity, the mounting plate divides the internal cavity into a first cavity and a second cavity, and an opening is formed on the mounting plate for mounting the vibrating diaphragm; a first inlet and a first outlet are formed on the outlet plate corresponding to the first cavity; a second inlet and a second outlet are formed on the outlet plate corresponding to the second cavity; the vibrating diaphragm is disposed at the opening of the mounting plate to separate the first cavity and the second cavity.

[0051] The present invention also provides a vehicle drag reduction method, wherein the vehicle 2, during operation, has the following drag reduction steps:

[0052] S1, the airflow flows into the inlet 11 of the self-maintaining synthetic jet device 1 through the front and / or bottom of the vehicle 2;

[0053] Airflow enters from the front and / or below of vehicle 2 through the inlet 11 of the maintaining synthetic jet device 1 to remove low-speed air from the front and / or below of vehicle 2, thereby absorbing low-energy air fluid within the boundary layer, suppressing flow separation, and reducing vehicle drag.

[0054] Furthermore, the airflow flows from the front and / or bottom of the vehicle 2 into the inlet 11 of the self-sustaining synthetic jet device 1, and is also used to inject air into the cavity of the self-sustaining synthetic jet device 1.

[0055] S2, the air jet is injected into the roof of the vehicle 2 through the outlet 12 after the energy and frequency of the air jet are modulated by the vibration of the diaphragm in the cavity of the self-sustaining synthetic jet device 1.

[0056] An air jet is sprayed from outlet 12 onto the roof of vehicle 2 to inject high-energy air fluid into the roof, enhance resistance to flow separation, suppress the tail section separation zone of the vehicle, and reduce vehicle drag.

[0057] The present invention also provides a vehicle, including a vehicle 2 and a vehicle drag reduction structure disposed on the vehicle 2.

[0058] The above description is merely an embodiment and does not constitute any limitation on the present invention. Any person skilled in the art can make many possible variations, modifications, or alterations to the technical solutions of the present invention without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A vehicle drag reduction structure, characterized in that, Includes a self-sustaining synthetic jet device (1) installed on the vehicle (2); The inlet (11) of the self-sustaining synthetic jet device (1) allows air to flow into the front and / or bottom of the vehicle (2) to supply air to the self-sustaining synthetic jet device (1) while simultaneously sucking up low-speed air in front of and / or bottom of the vehicle (2). The outlet (12) of the self-sustaining synthetic jet device (1) sprays an air jet from the roof of the vehicle (2) to inject high-energy air fluid into the roof of the vehicle (2) and suppress flow separation at the roof of the vehicle (2). The air jet frequency of the self-maintaining synthetic jet device (1) is controllable, and the air jet intensity is controllable. By adjusting the air jet frequency, the air jet intensity can be adjusted in real time to achieve drag reduction effect under different wind speeds and vehicle speeds. The body of the self-sustaining synthetic jet device (1) is arranged inside the roof of the vehicle (2), and the outlet (12) is provided through the roof of the vehicle (2). The self-sustaining synthetic jet device includes a first cavity plate, a second cavity plate, an outlet plate, a mounting plate, and a vibrating diaphragm. The first cavity plate, the second cavity plate, and the outlet plate together form an internal cavity. The mounting plate divides the internal cavity into a first cavity and a second cavity. An opening is provided on the mounting plate for installing the vibrating diaphragm. A first inlet and a first outlet are provided on the outlet plate corresponding to the first cavity. A second inlet and a second outlet are provided on the outlet plate corresponding to the second cavity. The vibrating diaphragm is disposed at the opening of the mounting plate to separate the first cavity and the second cavity.

2. The vehicle drag reduction structure as described in claim 1, characterized in that, The vehicle (2) has an air inlet (21) at the front and / or below, and the inlet (11) is connected to the air inlet (21) through an air guide structure (3).

3. The vehicle drag reduction structure as described in claim 2, characterized in that, The air guiding structure (3) is an air guiding pipe.

4. The vehicle drag reduction structure as described in claim 2, characterized in that, It also includes an air conditioning system located between the inlet (11) and the air inlet (21).

5. The vehicle drag reduction structure as described in claim 2, characterized in that, The self-sustaining synthetic jet device (1) is provided in several units; Several air inlets (21) are arranged in an array in front of the vehicle (2) along the width and / or height direction of the vehicle (2), and / or several air inlets (21) are arranged in an array below the vehicle (2) along the width and / or length direction of the vehicle (2). Several outlets (12) are arranged in an array on the roof of the vehicle (2) along the width and / or length of the vehicle (2).

6. The vehicle drag reduction structure as described in any one of claims 1-5, characterized in that, The self-sustaining synthetic jet device (1) is a self-sustaining synthetic dual jet device.

7. A method for reducing vehicle drag, characterized in that, Using the vehicle drag reduction structure as described in any one of claims 1-6, the method includes: during vehicle (2) operation, the following drag reduction steps are performed: S1, the airflow flows into the inlet (11) of the self-maintaining synthetic jet device (1) through the front and / or bottom of the vehicle (2). Airflow flows from the front and / or below of the vehicle (2) into the inlet (11) of the maintaining synthetic jet device (1) to remove low-speed air from the front and / or below the vehicle (2), thereby absorbing low-energy air fluid in the boundary layer, suppressing flow separation, and reducing vehicle drag. The airflow flows from the front and / or below of the vehicle (2) into the inlet (11) of the self-sustaining synthetic jet device (1), and is also used to inject air into the cavity of the self-sustaining synthetic jet device (1); S2, the air jet is injected into the roof of the vehicle (2) through the outlet (12) after the energy and frequency of the air jet are modulated by the vibration of the diaphragm in the cavity of the self-sustaining synthetic jet device (1). An air jet is sprayed from the outlet (12) onto the roof of the vehicle (2) to inject high-energy air fluid into the roof, enhance resistance to flow separation, suppress the tail separation zone of the vehicle, and reduce vehicle drag.

8. A vehicle characterized in that, Includes a vehicle (2) and a vehicle drag reduction structure as described in any one of claims 1-6 disposed on the vehicle (2).

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