Aerodynamic Component with Inclined Rear Edge and Fin
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Solution Overview
Problem
The existing vehicle body designs face challenges in reducing the lift coefficient of the rear part, which leads to increased pressure drag, degraded fuel consumption, and compromised handling stability due to the formation of dead air regions and insufficient ground load on the rear wheels.
Innovation Solution
An aerodynamic component featuring a plate-shaped base with a fin on its front face, inclined rear edge, and additional fins is mounted on the side face of the upper rear vehicle body, creating a turbulent vortex to reduce lift coefficient and stabilize airflow, thereby enhancing handling stability and minimizing pressure drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the vehicle body shape is streamlined to reduce the lift coefficient of the rear part, then the pressure drag is reduced and fuel consumption is improved, but an upward lift occurs on the vehicle body which reduces the ground load of the wheels and degrades handling stability
Solution Approach 1:
The invention applies a specific aerodynamic component with a particular geometric configuration (inclined rear edge at 15-45 degrees, fin with specific height and position) to the upper rear side part of the vehicle body. This localized structural modification creates a controlled turbulent vortex that specifically addresses the lift coefficient imbalance at the rear part without requiring comprehensive redesign of the entire vehicle body, thus improving fuel consumption while maintaining handling stability.
Solution Approach 2:
The invention changes the geometric parameters of the aerodynamic component, specifically the rear edge inclination angle (15-45 degrees), fin height (0.05-0.2 times vehicle width), and fin position (0.2-0.4 times distance from front face), to optimize the balance between lift coefficients of the front and rear parts. By adjusting these parameters, the turbulent vortex strength and position are controlled to reduce rear lift coefficient to match the front lift coefficient, thereby improving fuel consumption without compromising handling stability.
2Reliability
If the lift coefficient of the rear part is reduced to balance with the front part, then handling stability is enhanced, but the structural complexity of the vehicle body increases
Solution Approach 1:
The aerodynamic component is designed as a separate, modular structure that can be independently attached to the upper rear side part of the vehicle body. This segmentation allows the component to be designed, manufactured, and installed independently from the main vehicle body structure, reducing the overall structural complexity while achieving the goal of balancing lift coefficients to enhance handling stability.
Solution Approach 2:
The aerodynamic component acts as an intermediary element between the vehicle body and the airflow. Rather than modifying the entire vehicle body structure, this intermediate component specifically addresses the airflow separation and vortex formation at the upper rear side part, thereby enhancing handling stability through a simple, focused structural addition.
3Force
If a rear spoiler or under cover modification is added to decrease the lift coefficient of the rear part, then the ground load of the rear wheel increases, but the manufacturing complexity and cost increase
Solution Approach 1:
Instead of modifying the entire rear spoiler or under cover structure, the invention applies a localized aerodynamic component with specific geometric features (inclined rear edge, protruding fin) only to the upper rear side part of the vehicle body. This localized approach increases the ground load of the rear wheel through controlled vortex generation while minimizing manufacturing complexity and cost.
Solution Approach 2:
Rather than adding complex rear spoilers or modifying under covers to reduce rear lift coefficient, the invention inverts the approach by using a simple geometric configuration (inclined rear edge followed by a protruding fin) that generates turbulent vortex to achieve the same effect. This inverted design philosophy simplifies manufacturing while effectively increasing the ground load of the rear wheel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The aerodynamic component effectively balances the lift coefficients of the front and rear vehicle parts, improving handling stability, reducing lateral deflection, and minimizing dead air regions, leading to enhanced fuel efficiency and aerodynamic performance.
Implementation Method 1
it is possible for the aerodynamic component to generate a turbulent vortex in the air flow passing the vehicle body upper rear part
Implementation Method 2
generate a turbulent vortex in the air flow passing the vehicle body upper rear part to thus decrease the lift coefficient
Implementation Method 3
stabilizing the turbulent vortex on opposite side faces of the vehicle body by means of the fin provided on the base part
Implementation Method 4
suppresses eddies dragged around from the vehicle body side face to the vehicle body rear face and minimizes the occurrence of a dead air region
Data Source
AI summary
An aerodynamic component disposed on a side face of an upper rear part of an automobile vehicle body and reduces a lift coefficient of a vehicle body rear part, includes a plate-shaped base part and a fin projectingly provided on a front face of the base part, wherein the base part gently increases in thickness from a front edge side to a rear edge side, and has at the rear edge a shape that rises steeply with respect to the side face of the upper rear part of the vehicle body.