Vehicle Diffuser Boundary Layer Bleeding Gap
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Solution Overview
Problem
Existing vehicle diffusers are passive devices that do not effectively control the boundary layer of airflow, leading to inefficiencies in aerodynamic performance and downforce generation.
Innovation Solution
A vehicle diffuser design featuring a first smoothly rising panel, a second panel, and a gap between them, where the edge of the second panel adjacent to the gap is offset and below the plane of the first panel. This design bleeds off the boundary layer, enhancing airflow efficiency and downforce generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional passive diffuser is used, then the structure is simple and easy to manufacture, but the aerodynamic efficiency and downforce generation are insufficient
Solution Approach 1:
The diffuser is divided into multiple panels (first panel, second panel, third panel) with a gap between them, allowing the boundary layer to be bled off separately from the main airflow. This segmentation enables independent control of boundary layer removal while maintaining the overall diffuser structure.
Solution Approach 2:
The boundary layer is extracted from the main airflow through the gap between the diffuser panels. By removing this low-momentum air layer, the overall aerodynamic efficiency is improved without requiring complex active control systems.
2Volume of moving object
If the diffuser panels are placed close together, then the structure is compact, but the boundary layer bleeding effectiveness is reduced
Solution Approach 1:
The gap between the first and second panels is specifically positioned and dimensioned to optimize boundary layer bleeding at that local location, while the overall diffuser maintains a compact volume through the coordinated arrangement of all panels.
3Device complexity
If the second panel edge is aligned with the first panel plane, then the structure is simpler, but the boundary layer removal is less effective
Solution Approach 1:
The second panel edge is positioned below the plane of the first panel at the gap location, creating a localized geometric feature that enhances boundary layer bleeding effectiveness without requiring complex alignment throughout the entire structure.
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 diffuser design improves aerodynamic efficiency by 30% compared to conventional ground effect supercars, reducing drag and enhancing downforce while potentially eliminating the need for additional aerodynamic devices.
Implementation Method 1
A diffuser, in this context, is a shaped section of the vehicle's lower rear section which improves the car's aerodynamic properties by enhancing the transition between the high-velocity airflow underneath the car and the much slower freestream airflow of the ambient atmosphere behind the vehicle. It works by providing a space for the underbody airflow to decelerate and expand in volume
Implementation Method 2
Air passing beneath the vehicle is accelerated as it is funneled into the space between the vehicle and the ground, via Bernoulli's principle; this is beneficial in that the lower pressure which results creates a downforce effect
Implementation Method 3
This type of gap in the diffuser serves to bleed off the boundary layer from the airflow passing through the diffuser, thus enhancing its effectiveness and improving the downforce that is generated as a result
Data Source
AI summary
A diffuser element for the underside of a vehicle comprises in longitudinal vertical section, in sequence from front to rear, a first smoothly and monotonically rising panel, and a second panel, and a gap between the first and second panels, wherein the edge of the second panel adjacent the gap comprises a substantially flat planar section which is offset from and below the plane of the first panel ahead of the gap. This type of gap in the diffuser serves to bleed off the boundary layer from the airflow passing through the diffuser, thus enhancing its effectiveness and improving the downforce that is generated as a result. The gap is preferably located in the front half of the diffuser and can form the entrance to a duct leading to an exit on the rear of the vehicle.