CN-116331370-B - Variable cross section fin suitable for FSAE racing car

CN116331370BCN 116331370 BCN116331370 BCN 116331370BCN-116331370-B

Abstract

The invention discloses a variable cross section tail fin suitable for an FSAE racing car, which comprises a variable cross section wing group, an upper beam wing, a first lower beam wing, a second lower beam wing and an end plate. The variable section wing group is composed of a main wing, a first flap and a second flap, three wings are variable section wings, the variable section wings are lifted up in a small whole section in the middle section of a wing span, the main wing, the first flap and the second flap are sequentially arranged between end plates on two sides and are distributed approximately in a diagonal line, the second flap is provided with a gurney flap, an upper beam wing is arranged on an end corner of the end plate, a first lower beam wing and a second lower beam wing are distributed at a position close to the bottom of the end plate, two end plates are symmetrically arranged on two sides, and the end plate is provided with a shutter, an end plate outer edge flanging, a front edge notch, a rear edge notch and a guide strip. The variable section wing can reduce the influence of the headrest on the turbulence and the like caused by the air flow, and can reduce the sliding of the air flow in the wingspan direction, so that the pressure distribution of the wing surface is more uniform, and the shutter structure can reduce the resistance.

Inventors

LIU YONGZHI
GAO QIANG
LIU RUI
WANG JIAGANG
CUI JINHE

Assignees

东南大学

Dates

Publication Date: 20260505
Application Date: 20230423

Claims (7)

1. The variable cross-section tail wing suitable for the FSAE racing car comprises end plates (8) which are oppositely arranged on two sides, and a variable cross-section wing group (1) which is arranged between the two end plates (8), and is characterized in that the variable cross-section wing group (1) comprises a main wing (2), a first flap (3) and a second flap (4) which are sequentially arranged from the front lower part to the rear upper part of the end plates, the middle sections of the main wing (2), the first flap (3) and the second flap (4) are small attack angle parts, the two ends connected with the end plates (8) are large attack angle parts, the small attack angle parts and the large attack angle parts are connected through Bezier curve modeling, the horizontal distance and the vertical distance from the tail edge point of the main wing (2) to the front edge point of the first flap (3) are consistent, and the horizontal distance and the vertical distance from the tail edge point of the first flap (3) to the front edge point of the second flap (4) are consistent; The trailing edge of the second flap (4) is provided with a gurney flap (12) for increasing the bending degree of the trailing edge of the airfoil, so that the wake airflow is deflected upwards, the airflow separation of the airfoil can be reduced before stall occurs, the upward momentum of the airflow in the flow field near the trailing edge of the airfoil is increased, and the stress-resistant gradient of the airfoil is enhanced; The automobile body main ring (18) comprises an end plate (8), an upper beam wing (5) arranged above the main wing (2), wherein two ends of the upper beam wing (5) are connected to the end plate (8), the upper beam wing (5) is a special-shaped wing, the chord length of the middle part is half of the chord length of the two sides, and the upper beam wing is used for rectifying air flow brought by the automobile body main ring (18); The end plate (8) is provided with a shutter (9), and blades of the shutter (9) adopt a wing structure to provide negative lift force for air flow while reducing drag through the shutter (9).
2. A variable cross section tail for FSAE racing cars according to claim 1 wherein a first notch (13) is provided in the end plate (8) adjacent the trailing edge of the upper spar (5) for directing the air flow.
3. The variable cross-section tail fin applicable to the FSAE racing car according to claim 1 is characterized by further comprising a first lower beam wing (6) and a second lower beam wing (7) which are arranged between the end plates (8), wherein the first lower beam wing (6) and the second lower beam wing (7) are sequentially arranged at the lower rear part of the end plates (8) from front to back and are used for managing upward airflow brought by a diffuser (17) and preventing the airflow from affecting a middle low-pressure area of the variable cross-section wing group (1).
4. A variable cross section tail fin for an FSAE racing car in accordance with claim 1 wherein a second notch is provided in the top of the trailing edge of said end plate for guiding the airflow from the louvers.
5. The variable cross-section tail fin applicable to the FSAE racing car of claim 4 wherein guide strips are arranged on the outer side of the end plate and used for guiding air flow on the end plate in a matching manner through the blind window, and vortex generation is reduced.
6. A variable cross section tail fin suitable for FSAE racing cars according to claim 1 is characterized in that the outer side edge of the end plate (8) is provided with a flanging (11) for improving the negative lift and the rigidity of the end plate (8).
7. A variable cross section tail fin for FSAE racing cars according to claim 1 characterised in that a third gap (15) is provided below the front edge of the end plate (8).

Description

Variable cross section fin suitable for FSAE racing car Technical Field The invention relates to the technical field of aerodynamics, in particular to a variable cross section tail fin suitable for an FSAE racing car. Background In recent years, as the formula automobile university of universities in China rapidly progresses, various universities begin to put more effort into aerodynamic research. When racing car and air are moved relatively, the air can generate aerodynamic force and aerodynamic moment to racing car, so that the aerodynamic force of racing car has important influence on power performance and steering performance of racing car. The contribution quantity of the tail wing of the racing car is maximum, and 35-45% of negative lift force can be provided for the racing car. It is therefore necessary to design a variable cross section tail suitable for FSAE racing cars. Disclosure of Invention The invention aims at overcoming the defects of the prior art and provides a variable cross section tail fin suitable for an FSAE racing car. In order to solve the technical problems, the invention provides the following technical scheme: the variable cross section tail wing suitable for the FSAE racing car comprises end plates which are oppositely arranged on two sides, and variable cross section wing groups which are arranged between the two end plates, and is characterized in that the variable cross section wing groups comprise main wings, first flaps and second flaps which are sequentially arranged from the front lower part to the rear upper part of the end plates, the middle sections of the main wings, the first flaps and the second flaps are small attack angle parts, two ends connected with the end plates are large attack angle parts, the small attack angle parts are connected with the large attack angle parts through Bezier curve modeling, the horizontal distance and the vertical distance from the tail edge point of the main wings to the front edge point of the first flaps are consistent, and the horizontal distance and the vertical distance from the tail edge point of the first flaps to the front edge point of the second flaps are consistent. Further, the gurney flap is arranged at the trailing edge of the second flap and is used for increasing the camber of the trailing edge of the airfoil, so that the wake airflow is deflected upwards, the airflow separation of the airfoil can be reduced before stall occurs, the upward momentum of the airflow in the flow field of the trailing edge of the near airfoil is increased, and the stress-resistant gradient of the airfoil is enhanced. Further, the automobile body main ring is characterized by further comprising an upper girder wing arranged above the main wing, wherein two ends of the upper girder wing are connected to the end plates, the upper girder wing is a special-shaped wing, the chord length of the middle part of the upper girder wing is half of the chord length of the two sides, and the upper girder wing is used for rectifying air flow brought by the automobile body main ring. Further, a first notch is provided in the end plate at a position near the trailing edge of the upper beam for guiding the air flow. Further, the device also comprises a first lower beam wing and a second lower beam wing which are arranged between the end plates, wherein the first lower beam wing and the second lower beam wing are sequentially arranged at the lower rear part of the end plates from front to back and are used for managing the upward air flow brought by the diffuser 17 and preventing the air flow from affecting the middle low pressure area of the variable section wing group. Further, the end plate is provided with a shutter, and the blades of the shutter adopt a wing structure to provide negative lift force for the air flow when drag reduction is performed through the shutter. Further, a second notch is arranged at the top of the rear edge of the end plate and is used for guiding airflow flowing out of the louver. Further, the outside of the end plate is provided with a guide strip for matching with the louver to guide the air flow on the end plate, so that the generation of vortex is reduced. Further, the outer side edge of the end plate is provided with a flanging for improving the negative lifting force and the rigidity of the end plate. Further, a third notch is arranged below the front edge of the end plate. Compared with the prior art, the invention has the beneficial effects that: 1. The variable cross section tail wing of the vehicle is lifted for a small whole section of the middle span, the attack angle of the middle part is small, the area of the main wing in a headrest projection area is reduced, the influence of turbulence caused by a headrest on the aerodynamic performance of the tail wing is avoided as much as possible, the attack angles of the two side parts are greatly suitable for the upward airflow caused by the front wing, the connection parts