Porous Vehicle Wall Passive Jet Boundary Layer Control
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Solution Overview
Problem
Existing systems for reducing aerodynamic drag in motor vehicles do not effectively modify the area of boundary layer detachment, which limits their ability to optimize aerodynamic performance and adapt to different driving conditions.
Innovation Solution
A system featuring hollow components with porous, curved outer walls that control the detachment of the boundary layer by using passive air jets, allowing for the modification of the aerodynamic characteristics of a vehicle by adjusting the distribution of holes and the shape of these components, enabling the selection and modification of the boundary layer detachment area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If passive jets are used to reduce aerodynamic drag, then drag reduction is achieved, but the area of boundary layer detachment cannot be modified
Solution Approach 1:
The invention makes the boundary layer detachment area dynamically modifiable by using hollow components with adjustable internal volumes. The volume of these components can be varied to change the detachment area, allowing the system to adapt to different driving conditions while maintaining drag reduction benefits through passive jets.
Solution Approach 2:
The invention changes the physical parameter of the hollow component's internal volume to control the boundary layer detachment area. By adjusting the volume parameter, the system can modify where the boundary layer detaches from the vehicle body, providing adaptability without compromising the drag reduction effect.
2Reliability
If the aerodynamic characteristics are optimized for specific conditions, then performance is improved, but the system cannot adapt to different driving conditions
Solution Approach 1:
The system achieves both optimized performance and adaptability by making the hollow component volumes dynamically adjustable. This allows the aerodynamic characteristics to be optimized for specific conditions when needed, while also enabling adaptation to different driving conditions by modifying the detachment area through volume adjustment.
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
This system optimizes aerodynamic performance by reducing drag and allowing for dynamic adjustment of aerodynamic characteristics, enhancing the vehicle's efficiency and adaptability, such as in racing scenarios where different circuit conditions require specific aerodynamic settings.
Implementation Method 1
designed to cause detachment of the boundary layer at a predetermined area of a part of the motor-vehicle body by the use of passive jets
Implementation Method 2
cause detachment of the boundary layer at a predetermined area
Implementation Method 3
the air that laps the vehicle enters the gap through the holes made in the side walls and exits from the gap through the holes made in the rear wall of the trailer. In this way, from the rear wall of the trailer there exit jets of air defined as 'passive'
Data Source
Figure 1~2
Figure 3~3A
Figure 4
AI summary
A motor vehicle comprises a system for controlling the aerodynamic drag thereof by causing detachment of the boundary layer at a predetermined area of a part of the body thereof. The system comprises at least one component of the structure of the motor vehicle constituting a separate element rigidly connected to the structure, wherein the component defines an outer wall of the motor vehicle, wherein the outer wall (R) is made porous, with an orderly distribution of pores or holes (p). The porous wall (R) closes externally a chamber obtained within the component (2, 3, 4) of the structure of the motor vehicle in such a way that, when the motor vehicle is travelling, a first part of the pores or holes (p) situated in an area of the aerodynamic field of the vehicle with higher relative pressure enables part of the flow of air that laps the vehicle to enter the chamber, whereas a part of the pores or holes (p) situated in an area of the aerodynamic field of the vehicle with lower relative pressure functions as outlet for the flow of air from the aforesaid chamber towards the outside of the vehicle in such a way as to generate jets of air that cause detachment of the boundary layer. The position of the pores or holes (p) situated in an area of the aerodynamic field of the vehicle with lower relative pressure is chosen so as to determine detachment of the boundary layer in a desired area.