Rear-End Diffuser Flap Curvature for Aerodynamic Flow Control
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Solution Overview
Problem
Existing rear-end diffuser arrangements for motor vehicles are cumbersome to install and integrate, particularly in the underbody region, and are limited by design constraints, which restrict their flexibility and aerodynamic effectiveness.
Innovation Solution
A rear-end diffuser arrangement with a concavely curved flap that can be integrated into the rear-end region, featuring a movable flap with a separation edge and adaptable design to accommodate exhaust tailpipes, enhancing flexibility and aerodynamic performance by reducing deployment angle and improving air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rear-end diffuser arrangement is integrated in the underbody region with a fixed diffuser part and movable flap, then aerodynamic performance is improved, but installation becomes highly cumbersome and design flexibility is restricted
Solution Approach 1:
The patent transitions the diffuser arrangement from the underbody region to the rear-end region of the vehicle. This spatial relocation simplifies installation by utilizing the more accessible rear-end area while maintaining aerodynamic effectiveness through strategic positioning of the flap element at the vehicle's rear boundary layer separation zone.
Solution Approach 2:
Instead of integrating the diffuser in the conventional underbody location, the patent inverts the approach by placing it at the rear-end region. This inversion leverages the structural space availability at the rear end and simplifies both installation and design integration while achieving the same aerodynamic objectives.
2Reliability
If the flap is deployed to improve aerodynamics, then air flow control is enhanced, but ground clearance is reduced
Solution Approach 1:
The patent employs a concavely curved flap surface that faces toward the vehicle rear end. This curvature is strategically designed to optimize aerodynamic flow control while limiting the flap's deployment angle. The curved geometry allows effective air flow management with reduced angular displacement, thereby maintaining greater ground clearance compared to flat flap designs.
3Reliability
If the flap surface is curved toward the motor vehicle, then horizontal air flow is ensured and aerodynamic characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The concave curvature of the flap surface is designed to match the natural flow separation pattern at the vehicle rear end. This specific curvature profile optimizes horizontal air flow and aerodynamic performance while remaining manufacturable through standard forming processes for automotive body panels.
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 solution provides greater installation flexibility, increased ground clearance, and improved aerodynamic characteristics by ensuring horizontal air flow and reduced air resistance, suitable for various vehicle designs including electric vehicles without exhaust-gas tailpipes.
Implementation Method 1
for physical reasons, the surface that is curved toward the motor vehicle ensures a horizontal flow-off of air and improves the aerodynamic characteristics
Data Source
AI summary
A rear-end diffuser arrangement for a motor vehicle has at least one flap (16, 18; 32) mounted on a body part (10) of the motor vehicle (2) so as to be movable by at least one drive device (38). The flap (16, 18; 32) is movable from a retracted state into a deployed state and vice versa. The at least one flap (16, 18; 32) has a concavely curved surface facing toward the vehicle rear end (20).