New energy automobile range extending device based on Venturi effect wind power generation

Abstract

The invention discloses a new energy automobile range extending device based on Venturi effect wind power generation, relates to the technical field of new energy, and is used for solving the technical problem of low power generation efficiency caused by non-uniform stress of blades due to limited natural wind speed, large fluctuation and airflow turbulence of an existing range extending device. The new energy automobile range extending device based on Venturi effect wind power generation comprises a gradually-shrinking channel and a wind power generation mechanism, and the gradually-shrinking channel is at least provided with a shrinking section and an expanding section; the tapered channel is provided with a through hole; the wind power generation mechanism is arranged in the gradually-shrinking channel, and a rotating part of the wind power generation mechanism is arranged between the through hole and the air outlet or flush with the through hole in position. Airflow enters from the contraction section of the gradual contraction type channel and flows out from the expansion section; the total area of the through holes accounts for 1-10% of the area of the air inlet of the gradually-shrinking channel; the ratio of the length of the expansion section to the length of the contraction section is 1: (1-5); and the curvature of the contraction section is matched with that of the expansion section.

Description

Technical Field

[0001] This invention relates to the field of new energy technology, and more specifically, to a new energy vehicle range extender based on Venturi effect wind power generation. Background Technology

[0002] With the rapid development of the new energy vehicle industry, pure electric vehicles and hybrid electric vehicles have become the mainstream in the market. However, insufficient driving range remains the core pain point restricting their popularization. Pure electric new energy vehicles are constantly making technological breakthroughs and updates in terms of vehicle range, including improvements in battery density, upgrades in internal energy storage materials, and breakthroughs in the latest solid-state battery technology, all of which have improved energy storage technology. In terms of energy replenishment, range-extended electric vehicles generate electricity through fuel range extenders, which still consumes fossil fuels, increasing the cost of new energy vehicles.

[0003] To address the range extension issue of new energy vehicles, the technology of using onboard wind power generation units to extend the range of new energy vehicles has become a potential solution. The core technology lies in the fact that during vehicle operation, especially when traveling on highways for extended periods, there is a relatively stable and high-speed airflow in front of the vehicle. This technology can be used to install wind turbine units to generate electricity to supplement the energy storage system. Existing range extenders have limited and fluctuating natural wind speeds, and the turbulent airflow causes uneven stress on the blades, resulting in low power generation efficiency and failing to meet the power replenishment needs of new energy vehicles. Summary of the Invention

[0004] The purpose of this invention is to provide a range extender for new energy vehicles based on Venturi effect wind power generation, addressing the technical problems of existing range extenders where limited and fluctuating natural wind speeds, turbulent airflow causing uneven blade stress, and resulting in low power generation efficiency, thus failing to meet the power replenishment needs of new energy vehicles. In view of this, this invention achieves this through the following solution.

[0005] This invention provides a range extender for new energy vehicles based on Venturi effect wind power generation, comprising: A tapered channel is configured to have at least a contraction section and an expansion section; multiple through holes are equally spaced along the central axis of the tapered channel; the tapered channel has an air inlet and an air outlet; the starting end of the contraction section is used as the air inlet, and the end of the expansion section is used as the air outlet. A wind power generation mechanism is installed inside the tapered channel. The wind power generation mechanism has a rotating part, which is located between the through hole and the air outlet, or flush with the position of the through hole. Wherein, the total area of ​​the through holes accounts for 1-10% of the air inlet area of ​​the tapered channel; the ratio of the length of the expanding section to the length of the contracting section is 1:(1-5); the curvature of the contracting section matches the curvature of the expanding section; the ratio of the air inlet area to the air outlet area of ​​the tapered channel is greater than or equal to 1 and less than or equal to 3; the ratio of the area of ​​a single through hole to the air inlet area of ​​the tapered channel is 0.1-1%; The rotating part includes a fan structure composed of multiple blades; the airfoil of the blades is a low Reynolds number airfoil; the Reynolds number of the blades during operation is 1×10⁻⁶. 5 ~1×10 6 In the airfoil segment parameters of the blade, the chord length is 0.002~0.006 meters, and the installation angle corresponding to the chord length is -0.294~8.591°.

[0006] Compared with existing technologies, the new energy vehicle range extender based on the Venturi effect wind power generation of the present invention is used to generate wind power by installing it at the ventilation opening position during the movement of a new energy vehicle. During the vehicle's movement, the airflow enters a tapered channel along the vehicle's direction of travel, and then flows through a contraction section and an expansion section. Due to the continuously decreasing cross-sectional area of ​​the contraction section, according to the Venturi effect, the through holes provided on the side wall of the tapered channel will generate a suction effect towards the interior of the tapered channel, further drawing external air into the interior of the tapered channel, and causing the airflow velocity to continuously increase in its flow direction. The airflow then passes through the expansion section... The airflow velocity after the expansion section can be increased by at least 2 times (the specific value depends on the vehicle speed; at a vehicle speed of 72 km / h, the wind speed in the contraction section of the narrowing channel can reach 40-55 m / s; at a vehicle speed of 108 km / h, the wind speed in the contraction section of the narrowing channel can reach 60-75 m / s). During this process, the accelerated airflow forms an acceleration channel in the middle (or near the middle) of the narrowing channel and acts perpendicularly on the rotating part of the wind power generation mechanism. The power P of the wind power generation mechanism is proportional to the cube of the wind speed V, i.e., P = 0.5 × ρ × A × v³ × C p Therefore, accelerating the airflow can improve power generation efficiency. Here, P represents power (in W), and ρ represents air density (in kg / m³). 3 A represents the swept area of ​​the blades, in meters. 2 V represents wind speed, in m / s, C pThe wind energy utilization coefficient is a parameter that measures the efficiency of converting wind energy into mechanical energy, with a value ranging from 0 to 0.593. Accelerated airflow drives the rotating part to rotate and generate electricity, which is then transmitted to the power mechanism or charging / discharging management module of the new energy vehicle. Furthermore, in the above-mentioned new energy vehicle range extender based on Venturi effect wind power generation of the present invention, the total area of ​​the through holes accounts for 1-10% of the air inlet area of ​​the tapered channel, effectively maximizing airflow utilization and promoting stable airflow. Specifically, if this ratio is too small, insufficient air intake will result in insufficient airflow to drive the rotating part to rotate; if this ratio is too large, it will disrupt the contraction-acceleration flow field within the pipe (i.e., within the tapered channel), causing turbulence at the through holes and thus disrupting airflow stability. By controlling the total area of ​​the through holes and the air inlet area of ​​the tapered channel within the aforementioned ratio... Within the specified range, the utilization rate of airflow can be maximized, and the amplification effect of airflow on the velocity in the middle (or near the middle) of the converging channel can be avoided. Furthermore, by setting the ratio of the length of the expansion section to the length of the contraction section to be 1:(1~5), the acceleration effect of airflow can be maximized, energy loss can be reduced, and energy recovery efficiency can be improved. By matching the curvature of the contraction section with the curvature of the expansion section, airflow separation can be avoided and local losses can be reduced. Furthermore, the new energy vehicle range extender of the present invention is suitable for the auxiliary utilization of airflow kinetic energy under specific working conditions such as high-speed stable driving of vehicles. Under ideal operating conditions, such as when a vehicle is continuously traveling at approximately 108 km / h, a single unit can theoretically generate 3000W of power. A vehicle equipped with three units can generate a total of 9kW. It should be noted that the installation inevitably introduces additional air resistance and system energy loss. This invention has taken these factors into account during its design. Under specific operating conditions, its range extension effect can reach approximately 40% of the original range. After accounting for resistance and energy conversion efficiency, this translates to an increase in range of approximately 42km. The generated electricity can still effectively supplement the vehicle's energy consumption under specific conditions. In ideal and specific application scenarios, this device can, to a certain extent, assist in improving the vehicle's original range, thereby improving the vehicle's overall energy utilization performance at high speeds. Through the above-mentioned technology of this invention, the technical problems of existing range extenders—limited and fluctuating natural wind speeds, uneven blade stress caused by turbulent airflow, resulting in low power generation efficiency and inability to meet the power replenishment needs of new energy vehicles—are solved.

[0007] Furthermore, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, the ratio of the air inlet area to the air outlet area of ​​the tapered channel is greater than or equal to 1 and less than or equal to 3.

[0008] Furthermore, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, a plurality of through holes are provided at equal intervals along the central axis of the tapered channel in the contraction section or expansion section; the ratio of the area of ​​a single through hole to the air inlet area of ​​the tapered channel is 0.1~1%.

[0009] Furthermore, the new energy vehicle range extender based on Venturi effect wind power generation of the present invention also includes a filter screen; the filter screen is installed at the air inlet position of the tapering channel.

[0010] Furthermore, the new energy vehicle range extender based on Venturi effect wind power generation of the present invention also includes a mounting base; the mounting base is provided with the tapered channel, and the tapered channel is installed at the ventilation opening position during the vehicle's movement via the mounting base.

[0011] Furthermore, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, the rotating part includes a fan structure composed of multiple blades; wherein, the airfoil of the blades is a low Reynolds number airfoil; and the Reynolds number of the blades during operation is 1×10⁻⁶. 5 ~1×10 6 In the airfoil segment parameters of the blade, the chord length is 0.002~0.006 meters, and the installation angle corresponding to the chord length is -0.294~8.591°.

[0012] Furthermore, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, the airfoil segment parameters of the blades are as follows: when the chord length is 0.002 meters, the corresponding installation angle is -0.294 to -0.065°; when the chord length is 0.003 meters, the corresponding installation angle is 0.815 to 1.46°; when the chord length is 0.004 meters, the corresponding installation angle is 2.224 to 3.233°; when the chord length is 0.005 meters, the corresponding installation angle is 3.904 to 5.303°; and when the chord length is 0.006 meters, the corresponding installation angle is 6.48 to 8.591°.

[0013] Furthermore, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, the gradually narrowing channel is configured as a contraction section, a constant diameter section and an expansion section according to the fluid flow direction; wherein, the length ratio of the expansion section to the constant diameter section and the contraction section is 1:(1~2):(1~1.5); the length of the constant diameter section is 38~48% of the diameter of the constant diameter section.

[0014] Furthermore, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, the wind power generation mechanism further includes an integrated hub, a flange main shaft, a roller bearing, a flexible coupling, a generator spoiler, and a disc generator connected in sequence; the integrated hub has mounting holes circumferentially arranged on its side wall, and a connecting rod is arranged in the mounting holes, and the rotating part is formed after multiple blades are arranged on the connecting rod; the air inlet end of the integrated hub along the tapered channel is a tapered conical structure.

[0015] Furthermore, the new energy vehicle range extender based on Venturi effect wind power generation of the present invention also includes a first support and a second support; the wind power generation mechanism is disposed inside the tapered channel through the first support and the second support; the wind power generation mechanism is connected to the vehicle's power mechanism or charging and discharging management module. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a new energy vehicle range extender according to the present invention; Figure 2 This is a schematic diagram of the new energy vehicle range extender from the perspective of the air outlet in this invention. Figure 3 This is a schematic diagram of the new energy vehicle range extender from the perspective of the air inlet in this invention. Figure 4 This is a schematic diagram of a tapered channel structure in this invention; Figure 5 This is a schematic diagram of another type of tapered channel in the present invention; Figure 6 This is a schematic diagram showing a first support and a second support in the present invention; Figure 7 This is a schematic diagram showing another structure of the first and second supports in this invention; Figure 8 This is a schematic diagram showing another structure of the first support and the second support in this invention; Figure 9 This is a schematic diagram of the rotating part in this invention; Figure 10 This is a schematic diagram of the blade structure in this invention; Figure 11 This is a schematic diagram of the filter screen in this invention; Figure 12 This is a schematic diagram of the range extender of the present invention installed on a car; Figure 13 This is a schematic diagram of the wind power generation mechanism in this invention; Figure 14 This is a schematic diagram illustrating the distinction between the contraction section, expansion section, and constant diameter section in the tapered channel of this invention. Figure 15 This is a velocity cloud map inside the tapered channel in this invention; Figure 16 This is a pressure cloud diagram inside the tapered channel in this invention; Figure 17 This is another velocity cloud diagram inside the tapered channel in this invention; Figure 18 This is a velocity cloud map showing the velocity range of 0~60.27m / s after a through hole is set in the tapered channel in this invention; Figure 19 This is a velocity cloud map showing the velocity range of 0~10m / s after a through hole is set in the tapered channel in this invention; Figure 20 This is a velocity contour plot of the tapered channel in the control group of this invention; Figure 21 This is a pressure cloud diagram of the tapered channel in the control group of this invention.

[0017] Figure label: 1-Gradual narrowing channel; 101-Contraction section; 102-Expansion section; 103-Through hole; 104-Equal diameter section; 2-Wind power generation mechanism; 201-Rotating part; 2011-Blade; 2012-Integrated hub; 202-Flanged main shaft; 203-Roller bearing; 204-Flexible coupling; 205-Generator spoiler; 206-Disc generator; 207-Bearing washer; 3-Filter screen; 4-Mounting base; 5-First support; 6-Second support; 7-Automobile; 8-Range extender; Figure 14 In the diagram, S1 represents the inlet cross-section of the tapered channel, S2 represents the cross-section at the narrowest point of the tapered channel, and S3 represents the outlet cross-section of the tapered channel. Figure 15 In the diagram, A represents the center position and B represents the load-bearing position of the blade. Detailed Implementation

[0018] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0021] To address the range extension issue of new energy vehicles, the technology of using onboard wind power generation units to extend the range of new energy vehicles has become a potential solution. The core technology lies in the fact that during vehicle operation, especially when traveling on highways for extended periods, there is a relatively stable and high-speed airflow in front of the vehicle. This technology can be used to install wind turbine units to generate electricity to supplement the energy storage system. Existing range extenders have limited and fluctuating natural wind speeds, and the turbulent airflow causes uneven stress on the blades, resulting in low power generation efficiency and failing to meet the power replenishment needs of new energy vehicles.

[0022] To address the above technical problems, this invention provides a new energy vehicle range extender based on Venturi effect wind power generation, comprising a tapered channel 1 and a wind power generation mechanism 2. The tapered channel 1 is configured to have at least a contraction section 101 and an expansion section 102. The tapered channel 1 is provided with a through hole 103; specifically, the contraction section 101 or the expansion section 102 of the tapered channel 1 is provided with a through hole 103. The tapered channel 1 has an air inlet and an air outlet. The starting end of the contraction section 101 is used as the air inlet, and the expansion section 102 is used as the air outlet. The end of the expansion section 102 is used as an air outlet; the wind power generation mechanism 2 is set inside the tapered channel 1, and the wind power generation mechanism 2 has a rotating part 201, which is set between the through hole 103 and the air outlet, or is flush with the position of the through hole 103; wherein, the total area of ​​the through hole 103 accounts for 1 to 10% of the air inlet area of ​​the tapered channel 1; the ratio of the length of the expansion section 102 to the length of the contraction section 101 is 1:(1 to 5); the curvature of the contraction section 101 matches the curvature of the expansion section 102.

[0023] For specific implementation details, please refer to: Figure 14A through hole 103 can be provided at the junction of the contraction section 101 and the equal-diameter section 104. The rotating part 201 can be provided at the narrowest section S2 of the tapered channel 1. The range extender 8 of the present invention is installed at the ventilation port position of the vehicle 7 during the vehicle's movement. During the vehicle's movement, the airflow enters the tapered channel 1 along the vehicle's driving direction and then flows through the contraction section 101 and the expansion section 102. Since the cross-sectional area of ​​the contraction section 101 continuously decreases, according to the Venturi effect, the through hole 103 provided on the side wall of the tapered channel 1 will generate a suction effect, further drawing external air into the interior of the tapered channel 1, and causing the airflow velocity to continuously increase in its flow direction. After passing through the expansion section 102, the airflow velocity can be increased by at least 2 times (specifically depending on the vehicle's driving speed; when the vehicle's driving speed is 72 km / h, the wind speed of the contraction section 101 of the tapered channel 1 can reach 45~65 m / s; when the vehicle's driving speed is 108 km / h, the wind speed of the contraction section 101 of the tapered channel 1 can reach 45~65 m / s). 101. Wind speeds can reach 65~85m / s. During this process, the accelerated airflow forms an acceleration channel through the middle of the converging channel 1 and acts perpendicularly on the rotating part 201 of the wind power generation mechanism 2, driving it to rotate and generate electricity. The generated electricity is then transmitted to the power mechanism or charging / discharging management module of the vehicle 7. Specifically, the accelerated airflow acts perpendicularly on the blades 2011 of the wind power generation mechanism 2 through the acceleration channel formed in the middle of the converging channel 1, driving the rotating part 201 to rotate. The rotating part 201 is connected to the flange main shaft 202, which in turn drives the flange main shaft 202 to rotate. This, in turn, drives the disc generator 206 to operate and generate electricity through the flexible coupling 204. The three-phase AC power output by the disc generator 206 is converted into stable DC power by the rectifier and filter module and transmitted to the charging / discharging management module. Furthermore, the controller can also use MPPI (Model Predictive Power Response) based on the real-time wind speed detected by the wind speed sensor. Path Integral (Model Predictive Control) is used to control the generator torque of the wind power generation mechanism 2, and dynamically adjust the speed of the disc generator 206 to maximize wind energy capture and maintain stable operation. The adaptive control system dynamically adjusts the speed of the disc generator 206 (reducing the resistance of the disc generator 206 at low wind speeds to maintain a certain speed, and increasing the resistance of the disc generator 206 at high wind speeds to prevent excessive rotation exceeding the load borne by the blade 2011 and damaging the blade 2011, while maintaining a stable generator speed). In the event of sudden acceleration or deceleration of the vehicle 7, it ensures stable rotation of the rotating part 201 and maintains a relatively stable power generation current. The charge and discharge management module allocates electrical energy according to the SOC (State of Charge) information of the power battery. When SOC ≥ 80%, electrical energy is preferentially stored in the auxiliary energy storage battery; when SOC < 80%, electrical energy is directly supplemented to the power battery pack or used to power the vehicle's low-voltage electrical equipment.When the vehicle brakes or decelerates, the rotating part 201 rotates due to airflow inertia, which can also continuously generate electricity and store electrical energy.

[0024] As can be seen from the above technical solution and specific implementation process, the new energy vehicle range extender based on the Venturi effect wind power generation of the present invention is used to generate wind power by installing it at the ventilation opening position during the vehicle's movement. Specifically, the airflow enters the tapered channel 1 along the vehicle's driving direction, and then flows through the contraction section 101 and the expansion section 102. Since the cross-sectional area of ​​the contraction section 101 continuously decreases, according to the Venturi effect, the through hole 103 provided on the side wall of the tapered channel 1 will generate a suction effect, further drawing external air into the interior of the tapered channel 1, and causing the airflow velocity to continuously increase in its flow direction. After passing through the expansion section 102, the airflow velocity can increase by at least 2 times. In this process, the accelerated airflow forms an acceleration channel through the middle (or near the middle) of the tapered channel 1, and acts perpendicularly on the rotating part 201 of the wind power generation mechanism 2, driving it to rotate and generate electricity. The generated electrical energy is then transmitted to the power mechanism or charging / discharging management module of the vehicle 7. This invention effectively maximizes the utilization of airflow and forms a stable airflow by setting the total area of ​​the through hole 103 to 10% of the air inlet area of ​​the tapered channel 1. If this ratio is too small, insufficient air intake will result in the inability to drive the rotating part 201 to rotate. If this ratio is too large, it will disrupt the contraction-acceleration flow field in the pipe and cause turbulence in the airflow at the through hole 103. By controlling this ratio within the above range, the airflow utilization rate can be maximized and the amplification effect of the flow velocity in the middle of the tapered channel 1 can be avoided. By setting the ratio of the length of the expansion section 102 to the length of the contraction section 101 to be 1:(1~5), the airflow acceleration effect can be maximized, energy loss can be reduced, and energy recovery efficiency can be improved. By matching the curvature of the contraction section 101 with the curvature of the expansion section 102, airflow separation can be avoided and local losses can be reduced. The present invention solves the technical problems of existing range extender mechanisms, such as limited and fluctuating natural wind speed, turbulent airflow causing uneven force on the blades 2011, resulting in low power generation efficiency and inability to meet the power replenishment needs of automobiles 7.

[0025] As one possible implementation, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, the ratio of the area of ​​the air inlet cross-section S1 of the tapered channel 1 to the area of ​​the air outlet cross-section S3 is greater than or equal to 1 and less than or equal to 3. With this technical solution, the area of ​​the air outlet cross-section S3 is the air outlet area. Controlling the ratio of the area of ​​the air inlet cross-section S1 to the area of ​​the air outlet cross-section S3 to be greater than or equal to 1 and less than or equal to 3 allows the tapered channel 1 to tape moderately, avoiding turbulent losses such as airflow separation and eddies caused by an excessively large contraction ratio (e.g., >3). This allows the airflow to maintain wall-attached flow within the tapered channel 1, resulting in low flow resistance and low energy loss, ensuring the continuous and stable operation of the range extender 8. Simultaneously, controlling the area of ​​the air inlet cross-section S1 to be greater than or equal to the area of ​​the air outlet cross-section S3... This design ensures sufficient air intake at the air inlet, preventing power component output attenuation due to insufficient air intake. Furthermore, the area of ​​the air outlet cross-section S3 is not excessively reduced, preventing airflow congestion at the outlet and improving airflow circulation efficiency within the tapered channel 1, thus adapting to the dynamic airflow environment during vehicle operation. S2 represents the narrowest section of the tapered channel 1. The rotation plane of the rotating part 201 is perpendicular to the airflow output direction, converting the accelerated airflow kinetic energy into mechanical kinetic energy. The rotating part 201 is coaxially connected to the generator, realizing the conversion of mechanical energy into electrical energy.

[0026] In one possible implementation, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, a plurality of through holes 103 are equally spaced along the central axis of the tapering channel 1 in the contraction section 101 or the expansion section 102; the ratio of the area of ​​a single through hole 103 to the air inlet area of ​​the tapering channel 1 is 0.1~1%. For details on adopting this technical solution, please refer to... Figure 14A through hole 103 can be provided at the junction of the contraction section 101 and the equal-diameter section 104. The rotating part 201 can be provided at the narrowest section S2 of the tapered channel 1. The aforementioned air inlet area is the area of ​​the air inlet section S1 of the tapered channel 1. In this range extender 8, the effective range of a single through hole 103 provided in the tapered channel 1 is limited. In this embodiment, multiple through holes 103 are provided at equal intervals along the central axis of the tapered channel 1 in the contraction section 101 or the expansion section 102. The air injected through the multiple through holes 103 A thin, stable, high-speed annular flow layer is formed near the inner wall of the pipe. Multiple through-holes 103 together constitute a flow control ring, guiding the core airflow through the middle of the converging channel 1, enhancing the acceleration effect on the airflow. By setting through-holes 103 upstream of the separation initiation point (usually located before the pressurization section, i.e., before the contraction section 101), these through-holes 103 draw in gas, propelling the boundary layer fluid into the acceleration region, thereby partially or completely driving the gas flow and keeping the flow channel unobstructed. Furthermore, with multiple through-holes 103 on the sidewall of the converging channel 1, controlling the ratio of the area of ​​a single through-hole 103 to the inlet area of ​​the converging channel 1 to be 0.1% to 1%. Within this ratio range, external high-momentum airflow can be effectively introduced to increase the core flow velocity. This introduced secondary flow mixes with the core mainstream, further accelerating the fluid passing through the rotating section 201, directly increasing the kinetic energy available for power generation.

[0027] As one possible implementation, the new energy vehicle range extender based on Venturi effect wind power generation of the present invention further includes a filter screen 3; the filter screen 3 is installed at the air inlet position of the converging channel 1. In this technical solution, the filter screen 3 is used to filter impurities or dust in the fluid. The filter screen 3 can be made of stainless steel woven mesh and can consist of an outer layer and an inner layer. The outer layer can be a coarse filter screen 3 with a pore size of 1.5~2mm, and the inner layer can be a fine filter screen 3 with a pore size of 0.5~1mm. An electrostatic adsorption layer can be further provided between the two filter screens 3. The electrostatic adsorption layer is used to adsorb dust particles with a particle size ≥0.1μm. After the fluid passes through the filter screen 3 and is filtered of impurities or dust, it enters the interior of the converging channel 1, which can further improve the power generation efficiency of the range extender 8.

[0028] As one possible implementation, the new energy vehicle range extender based on Venturi effect wind power generation of the present invention further includes a mounting base 4; the mounting base 4 is provided with a tapering channel 1, which is installed at the ventilation opening position of the vehicle 7 during its movement via the mounting base 4. In this technical solution, the mounting base 4 serves as a support and mounting component for the range extender 8. By utilizing the empty space under the front hood of the vehicle 7, the range extender 8 of the present invention is installed in the front trunk position of the vehicle 7 via the mounting base 4, and the air inlet of the vehicle 7 during its movement communicates with the front of the vehicle 7; in some cases, the front of the vehicle 7 is the air conditioning unit, which can be integrated and installed in front of the air conditioning unit; the tapering channel 1 can be fixed to the mounting base 4 with screws, and the bottom of the mounting base 4 can be fixed to the front trunk position of the vehicle 7 with screws.

[0029] In one possible implementation, the new energy vehicle range extender based on Venturi effect wind power generation of the present invention includes a rotating part 201 comprising a fan structure composed of multiple blades 2011; wherein the airfoil of the blades 2011 is a low Reynolds number airfoil; and the Reynolds number of the blades 2011 during operation is 1×10⁻⁶. 5 ~1×10 6In the airfoil segment parameters of blade 2011, when the chord length is 0.002~0.006 meters, the corresponding installation angle is -0.294~8.591°. With this technical solution, the core of airfoil selection for blade 2011 is to achieve both low Reynolds number aerodynamic efficiency and lightweight structure. That is, to select a thin, lightweight UAV-like airfoil while maintaining sufficient strength, thus preserving lightweight design without sacrificing strength. Blade 2011 with this low Reynolds number airfoil is perfectly suited to this operating condition and is compatible with the structure of the tapered channel 1. For example, it can avoid friction between the blade 2011 and the inner wall of the tapered channel 1. The axial position of the rotating part 201 is focused on the middle section of the throat (i.e., the narrowest part) of the tapered channel 1, and the energy capture area is increased by at least 25% compared to the design that deviates from the throat. The design of the gap of its blade 2011 allows the airflow to pass through the gap, which provides a buffer space for the airflow and avoids the formation of dead zones or vortices between the rotating part 201 and the curved surface, which would affect the velocity gradient of the acceleration. If the gap is too small, the airflow velocity drops sharply at the gap, the static pressure increases, and airflow blockage occurs, leading to Uneven velocity distribution at the rotating section 201 leads to blade stall at 2011. This can prevent aerodynamic stall and a sudden drop in lift-to-drag ratio within the section, significantly reducing aerodynamic losses and improving the energy capture efficiency of blade 2011 for the accelerating airflow within the narrowing channel 1. For example, in the airfoil segment parameters of blade 2011, the installation angle corresponding to a chord length of 0.002 meters is -0.294 to -0.065°; the installation angle corresponding to a chord length of 0.003 meters is 0.815 to 1.46°; and the installation angle corresponding to a chord length of 0.004 meters is 2... The installation angle is 3.904~5.303° when the chord length is 0.005 meters and 6.48~8.591° when the chord length is 0.006 meters. A chord length of 0.002~0.006 meters represents a small-size design, which meets the space requirements for compact integration of the range extender into the vehicle while ensuring sufficient aerodynamic area through a reasonable combination of blade numbers, achieving efficient wind energy capture within a limited volume. The different installation angle designs conform to the blade BEM (Blade Elevation Model). The aerodynamic design theory of Element Momentum (blade element-momentum theory) enables the 2011 blade to capture more wind energy with the same swept area and prevents it from stalling under high wind speeds. Furthermore, the 2011 blade and the integrated hub 2012 can be designed as a single unit. The 2011 blade is a solid special airfoil structure, using the SD7032 airfoil structure, which is suitable for UAV blades, ensuring its lightweight nature and providing it with a certain mechanical strength. The 2011 blade is made of carbon fiber reinforced composite material.

[0030] As one possible implementation, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, the tapered channel 1 is configured as a contraction section 101, a constant diameter section 104, and an expansion section 102 according to the fluid flow direction; wherein, the length ratio of the expansion section 102 to the constant diameter section 104 and the contraction section 101 is 1:(1~2):(1~1.5); the length of the constant diameter section 104 is 38~48% of the diameter of the constant diameter section 104. With this technical solution, the energy utilization efficiency of the tapered channel 1 can be optimized, achieving a smooth acceleration-stable transition-efficient diffusion flow field. Specifically, by controlling the length ratio and the ratio of the length to the diameter of the constant diameter section 104 within the aforementioned range, the uniformity of the flow field at the blade 2011 can be ensured. This allows the receiving section 101 to accelerate the airflow, temporarily stabilizing the flow field (avoiding airflow turbulence), while preventing velocity attenuation due to excessive length of the constant diameter section 104. This ensures that the subsequent rotating part 201 (or blade 2011) receives a uniform and sufficient wind speed, improving the output stability of wind power generation. It can also adapt to the compact space of vehicles, reducing the difficulty of layout and making the device smaller. It can fit the limited installation space of the range extender 8, reducing the impact on the overall vehicle layout. Furthermore, it can reduce turbulence losses in the flow channel, improve the matching between the device's energy efficiency and the segment length, and ensure that the airflow remains attached to the wall and flows smoothly within the tapered channel 1, avoiding turbulence phenomena such as eddies and separation. This significantly reduces flow resistance and energy loss, further improving the overall energy efficiency of the range extender 8.

[0031] As one possible implementation, in the new energy vehicle range extender based on Venturi effect wind power generation of the present invention, the wind power generation mechanism 2 further includes an integrated hub 2012, a flange main shaft 202, a roller bearing 203, a flexible coupling 204, a generator spoiler 205, and a disc generator 206 connected in sequence; the integrated hub 2012 has mounting holes circumferentially arranged on its side wall, and a connecting rod is arranged in the mounting holes. After multiple blades 2011 are arranged on the connecting rod, a rotating part 201 is formed; the integrated hub 2012 has a tapered structure at one end of the air inlet along the tapered channel 1. With this technical solution, the flange main shaft 202 is mounted on the roller bearing 203. The flange main shaft 202 can be symmetrically fixed and connected to the disc generator 206 by the radial screws of the shaft part of the flexible coupling 204, which can make the installation deviation ≤0.2mm. When the torque of the flange main shaft 202 is too large, the flexible coupling 204 can be used to protect the safe operation of the generator. The front part of the disc generator 206 is equipped with a conical generator shroud 205, which is connected to the outer diameter of the disc generator 206. Its function is the same as that of the integrated hub 2012, which is used to reduce the turbulence of the fluid and protect the disc generator 206 to work stably. The rated power of the disc generator 206 can be 300~3000W, and the rated speed is adapted to the rated rotation speed of the rotating part 201, with an adaptation range of 600~3000r / min.

[0032] As one possible implementation, the new energy vehicle range extender based on Venturi effect wind power generation of the present invention further includes a first support 5 and a second support 6; the wind power generation mechanism 2 is disposed inside the tapered channel 1 through the first support 5 and the second support 6; the wind power generation mechanism 2 is connected to the power mechanism or charging and discharging management module of the vehicle 7. In this technical solution, taking the fluid flow direction as an example, the first support 5 and the second support 6 are disposed at the rear of the rotating part 201, that is, at the rear of the blade 2011, and are connected to the inner wall of the tapered channel 1. The first support 5 can be connected to the inner wall of the tapered channel 1 through three brackets, with a roller bearing 203 interference fit in the middle; the flange main shaft 202 of the wind power generation mechanism 2 is mounted on the roller bearing 203 and lubricated with lubricating oil; the rotating part 201 can be composed of an integrated hub 2012 and blades 2011, wherein three blades 2011 are screwed together at 120° at the integrated hub 2012. The blade 2011 is installed at a certain angle to the plane of rotation to ensure optimal aerodynamic performance. The gap between the inner wall of the tapered channel 1 and the maximum rotation trajectory of the blade 2011 can be 10mm. The integrated hub 2012 is fixed to the flange main shaft 202 at the rear with screws to ensure stable power transmission of the blade 2011. The rear of the flange main shaft 202 is fixed to the second support 6 by roller bearings 203 to ensure smooth rotation of the main shaft. Bearing washers 207 are added to the rear of the roller bearings 203 to fix the axial movement of the flange main shaft 202 and bear the axial force.

[0033] Furthermore, the new energy vehicle range extender based on Venturi effect wind power generation of the present invention may also include a wind speed sensor and a controller. The controller is electrically connected to the wind speed sensor, and both the controller and the wind speed sensor are connected to a power source. The wind speed sensor can be set at the front of the air inlet section of the tapered channel 1 to monitor the ambient wind speed in real time and transmit the signal to the controller. The controller adjusts the load of the rotating part 201 (composed of three blades 2011 and an integrated hub 2012) and the angle of the blades 2011 according to the wind speed change to optimize power generation efficiency. When the wind speed is lower than the start-up threshold, the controller automatically switches to a low-power mode to reduce energy loss and ensure that the device can operate stably and efficiently under different driving conditions. The controller can dynamically adjust the installation angle of the blades 2011 and the charging and discharging management strategy according to the real-time wind speed detected by the wind speed sensor.

[0034] Further, please refer to Figures 15 to 19Numerical simulation verification of the new energy vehicle range extender based on Venturi effect wind power generation of the present invention was conducted, and the results are explained. Specifically, numerical simulation methods were used to analyze the aerodynamic characteristics of the tapered channel 1 structure, the flow control method of the through-hole 103, and the arrangement area of ​​the wind power generation mechanism 2 in the present invention. The purpose of the simulation work is to observe the formation process and basic characteristics of the internal flow field morphology of the tapered channel 1 from the perspective of flow mechanism, so as to verify the influence of the relevant structural configuration on the airflow organization under engineering conditions. It should be noted that the simulation analysis of the present invention focuses on describing the flow state, velocity distribution characteristics, and local flow change trends of the internal fluid, in order to support the synergistic relationship between aerodynamic mechanism and structure. The simulation results are not used to quantitatively predict specific power generation, energy recovery ratio, or vehicle performance indicators. Furthermore, the numerical simulation model takes the tapered channel 1 and its internal flow field as the research object, and is constructed in combination with the relative inflow conditions under stable vehicle driving conditions. The computational domain covers the main structure of the contracting channel 1 and its internal flow region. The inlet of the contracting channel 1 is set with a given inflow velocity condition, and the outlet is set with a corresponding pressure boundary condition. The wall of the contracting channel 1 adopts a no-slip boundary form to reflect the basic flow characteristics of the contracting channel 1 inside the vehicle. During model construction, the simulation settings primarily aim to ensure the identifiability of the overall flow field characteristics and the stability of the results, avoiding the introduction of complex modeling elements unrelated to the research objectives. The relevant settings are used to obtain basic flow information such as velocity distribution, pressure changes, and streamline morphology within the contracting channel 1. Please refer to [link to relevant documentation]. Figures 15 to 17 During the simulation, the initial velocity (wind speed) at the air inlet was 30 m / s, the velocity at the center position A was approximately 42 m / s, and the velocity at the load position B of blade 2011 was approximately 66.5 m / s. As the fluid flowed within the converging channel 1, the velocity changed due to the shape or form of the converging channel 1 (e.g., contraction, interference from blade 2011), resulting in a significant increase in velocity in localized areas (such as near blade 2011). Further details can be found in the following sections. Figure 18 and Figure 19After introducing the through-hole 103 structure into the tapered channel 1, comparing the flow field results with and without the through-hole 103, it can be observed that the flow state in the near-wall region of the tapered channel 1 changes. Compared to the case without the through-hole 103 structure, the low-velocity flow range in the near-wall region of the tapered channel 1 is reduced after the through-hole 103 structure is added, the local flow distribution is more uniform, and the velocity distribution in the core flow region exhibits a more concentrated characteristic. This phenomenon indicates that the through-hole 103 structure, under the action of the pressure difference inside and outside the tapered channel 1, has a regulatory effect on the near-wall flow state inside the tapered channel 1. This regulatory effect is not manifested in the change of the mainstream direction, but rather in the influence on the local flow state, maintaining the continuous distribution characteristics of the overall flow pattern inside the tapered channel 1. Furthermore, the present invention also conducted simulation verification of experimental and control groups. Specifically, the structural parameters of the experimental and control groups are detailed in Table 1 below.

[0035] Table 1. Comparison of structural parameters between the experimental and control groups.

[0036] In Table 1 above, the air inlet pressurization section That is, the length of the contraction segment 101, and the isodiameter segment of the throat. That is, the length of the equal diameter section 104, and the outlet diffuser section. That is, the length of the expansion segment 102.

[0037] Furthermore, based on Table 1 above, the ratio index between the experimental group and the control group was obtained, as detailed in Table 2 below.

[0038] Table 2. Comparison of ratio indicators between experimental group and control group

[0039] As can be seen from Tables 1 and 2, there are significant differences between the experimental group and the control group in the structural parameters related to the tapered channel 1 and the through hole 103. Specifically, the experimental group differs from the control group in parameters such as the total area of ​​the air inlet, the total area of ​​the through hole 103, and the area of ​​a single through hole 103. Furthermore, the experimental group has a lower proportion of the total area of ​​the through hole 103 to the area of ​​the air inlet.

[0040] Further, please refer to Figures 15 to 21 The experimental results are analyzed as follows: (1) Velocity analysis: Although the airflow in the control group showed an overall acceleration trend in the converging channel 1, the continuity of the velocity contour lines in the axial direction was weak. There were obvious velocity gradient changes near the through hole 103 and in local positions of the converging channel 1, indicating that the fluid flow inside the converging channel 1 was strongly affected by local disturbances during the axial development process. Under the configuration of the control group, the flow state in the area where the wind power generation mechanism 2 is located is still greatly affected by the non-uniform flow in the converging channel 1. Under the configuration of the control group, the control effect of the through hole 103 structure on the near-wall flow is limited, and the boundary layer development still has a certain impact on the mainstream structure. In the velocity distribution of the control group, the flow recovery process is still slow, and the local low-speed region continues to exist in the axial direction, indicating that the disturbance introduced by the through hole 103 has a certain continuous impact on the mainstream structure.

[0041] (2) Pressure Analysis: In the pressure distribution of the control group, it can be seen that the axial pressure change of the converging channel 1 is relatively drastic, and there are obvious pressure abrupt change zones before and after the through hole 103 and in the local area of ​​the converging channel 1. This indicates that the through hole 103 structure has a relatively concentrated effect on the regulation of the pressure difference inside and outside the converging channel 1 under this configuration, and it is easy to form strong disturbances in the local area. The pressure distribution before and after the action area of ​​blade 2011 changes significantly, and there are local pressure concentration areas. This indicates that under the structural conditions of the control group, the matching degree between the effect of the wind power generation mechanism 2 on the incoming flow and the flow field inside the converging channel 1 is limited, and it is easy to introduce additional local flow fluctuations near blade 2011. The pressure distribution of the control group shows obvious non-uniform characteristics, and the pressure difference inside and outside the converging channel 1 is mainly concentrated in the local area. The pressure distribution of the control group still has local gradient changes, indicating that the influence of the through hole 103 structure on the internal flow field of the converging channel 1 has not decayed rapidly in the axial direction.

[0042] A comparative analysis of the numerical simulation results from the experimental and control groups reveals significant differences between the two schemes in terms of the flow field organization within the converging channel 1 and the flow characteristics in the area where the wind power generation mechanism 2 operates. The simulation results from the control group show that, under its corresponding converging channel 1 and through-hole 103 structural configuration, while a certain degree of velocity increase is achieved within the converging channel 1, a more pronounced gradient change in velocity and pressure distribution occurs before and after through-hole 103 and near the wind turbine cross-section. Uneven velocity distribution and enhanced near-wall flow disturbances exist in localized areas, somewhat affecting the continuity of the core flow region within the converging channel 1. In contrast, the experimental group, with the synergistic configuration of the geometric parameters of the converging channel 1, the area ratio of through-hole 103, and the placement of the wind power generation mechanism 2, exhibits a more concentrated axial velocity distribution within the converging channel 1. Simulation results show that, with the cooperation of the contraction section 101 and the expansion section 102, the airflow is guided and gradually accelerated along the axial direction of the contraction channel 1. Meanwhile, the through-hole structure 103, under the influence of the pressure difference inside and outside the contraction channel 1, regulates the flow state in the near-wall region, resulting in a relatively smaller low-speed stagnation area and maintaining the continuity and integrity of the core flow region. Furthermore, at the section where the wind power generation mechanism 2 is located, the flow field corresponding to the experimental group exhibits higher consistency characteristics. The main direction of airflow is dominated by the axial component, the velocity distribution is relatively concentrated, and the local pressure changes are relatively gentle. This flow state contrasts with the more pronounced local flow fluctuations in the control group, indicating that in the experimental scheme, the acceleration effect of the contraction channel 1, the flow regulation effect of the through-hole structure 103, and the arrangement position of the wind power generation mechanism 2 form a synergistic relationship, jointly shaping a relatively controlled internal flow field environment, making the operation of the wind power generation mechanism 2 more controlled by the internal flow field conditions.

[0043] In summary, the numerical simulation results from the experimental and control groups show that, in the absence of coordinated configuration, the control group's converging channel 1 exhibits uneven velocity and pressure distribution and significant local gradient changes before and after the through-hole 103 and at the cross-section of the wind power generation mechanism 2, thus affecting the continuity of the core flow region within the converging channel 1. In contrast, the experimental group, through coordinated design of the geometric parameters of the converging channel 1, the structural area ratio of the through-hole 103, and the arrangement of the wind power generation mechanism 2, achieves a more concentrated axial velocity distribution and relatively gentler pressure changes within the converging channel 1 at different key cross-sections. These differences indicate that the internal fluid flow state formed by the experimental group is more conducive to maintaining a stable and controlled aerodynamic working environment, providing strong support for improving the overall performance of the range extender 8 from a flow mechanism perspective.

[0044] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0045] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A new energy vehicle range extender based on Venturi effect wind power generation, characterized in that, include: A tapered channel is configured to have at least a contraction section and an expansion section; multiple through holes are equally spaced along the central axis of the tapered channel; the tapered channel has an air inlet and an air outlet; the starting end of the contraction section is used as the air inlet, and the end of the expansion section is used as the air outlet. A wind power generation mechanism is installed inside the tapered channel. The wind power generation mechanism has a rotating part, which is located between the through hole and the air outlet, or flush with the position of the through hole. Wherein, the total area of ​​the through holes accounts for 1-10% of the air inlet area of ​​the tapered channel; the ratio of the length of the expanding section to the length of the contracting section is 1:(1-5); the curvature of the contracting section matches the curvature of the expanding section; the ratio of the air inlet area to the air outlet area of ​​the tapered channel is greater than or equal to 1 and less than or equal to 3; the ratio of the area of ​​a single through hole to the air inlet area of ​​the tapered channel is 0.1-1%; The rotating part includes a fan structure composed of multiple blades; the airfoil of the blades is a low Reynolds number airfoil; the Reynolds number of the blades during operation is 1×10⁻⁶. 5 ~1×10 6 In the airfoil segment parameters of the blade, the chord length is 0.002~0.006 meters, and the installation angle corresponding to the chord length is -0.294~8.591°.

2. The new energy vehicle range extender based on Venturi effect wind power generation according to claim 1, characterized in that, It also includes a filter screen; The filter screen is installed at the air inlet of the tapered channel.

3. The new energy vehicle range extender based on Venturi effect wind power generation according to claim 1, characterized in that, It also includes a mounting base; The tapering channel is installed at the ventilation opening location during vehicle movement via the mounting bracket.

4. The new energy vehicle range extender based on Venturi effect wind power generation according to claim 3, characterized in that, In the airfoil segment parameters of the blade, the installation angle corresponding to a chord length of 0.002 meters is -0.294 to -0.065°; the installation angle corresponding to a chord length of 0.003 meters is 0.815 to 1.46°; the installation angle corresponding to a chord length of 0.004 meters is 2.224 to 3.233°; the installation angle corresponding to a chord length of 0.005 meters is 3.904 to 5.303°; and the installation angle corresponding to a chord length of 0.006 meters is 6.48 to 8.591°.

5. The new energy vehicle range extender based on Venturi effect wind power generation according to claim 1, characterized in that, According to the fluid flow direction, the tapered channel is configured as a contraction section, a constant diameter section, and an expansion section; wherein, the length ratio of the expansion section to the constant diameter section and the contraction section is 1:(1~2):(1~1.5); the length of the constant diameter section is 38~48% of the diameter of the constant diameter section.

6. The new energy vehicle range extender based on Venturi effect wind power generation according to claim 1, characterized in that, The wind power generation mechanism also includes an integrated hub, a flange main shaft, roller bearings, a flexible coupling, a generator spoiler, and a disc generator connected in sequence. The integrated hub has mounting holes circumferentially arranged on its sidewalls, and a connecting rod is installed in the mounting holes. After multiple blades are installed on the connecting rod, the rotating part is formed. The integrated hub has a tapered structure at one end of the air inlet along the tapered channel.

7. The new energy vehicle range extender based on Venturi effect wind power generation according to claim 1, characterized in that, It also includes the first support and the second support; The wind power generation mechanism is installed inside the tapered channel via the first and second supports; the wind power generation mechanism is connected to the vehicle's power unit or charging / discharging management module.

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