Vortex Disruption Devices for Vehicle Drag Reduction
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Solution Overview
Problem
Existing technologies fail to effectively disrupt the trailing vortex created by air flow around vehicles, leading to increased drag and reduced fuel efficiency, particularly for large vehicles with non-tapered rear ends.
Innovation Solution
A vortex disruption system comprising a plurality of devices positioned near the trailing edge of vehicles, extending beyond the boundary layer to disperse airflow and inhibit the formation of low-pressure vortices, thereby reducing drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vortex generators are used to alter flow over the vehicle surface, then boundary layer flow is modified, but the devices fail to effectively disrupt trailing vortices beyond the boundary layer
Solution Approach 1:
The vortex disruption device extends in the spanwise direction (lateral dimension) with a spanwise extent that is a significant fraction of the vehicle width. This dimensional approach allows the device to effectively disrupt vortices that form in the trailing wake region, moving beyond conventional two-dimensional boundary layer control to three-dimensional flow management that addresses the root cause of vortex-induced drag.
Solution Approach 2:
The device incorporates a flexible membrane that can deform under aerodynamic loading, allowing it to adapt its shape to the flowing air. This dynamic behavior enables the membrane to effectively interact with and disrupt the vortex structures in the trailing wake, converting the static structure into an active flow control element that responds to the actual flow conditions.
2Use of energy by moving object
If aerodynamic structures are added to reduce drag, then fuel efficiency improves, but device complexity and cost increase
Solution Approach 1:
The vortex disruption device uses a flexible membrane as its primary aerodynamic element, replacing complex rigid structures with a simple thin film that can be easily deployed and adjusted. This approach significantly reduces device complexity while maintaining effective vortex disruption, as the flexible membrane naturally adapts to flow conditions without requiring complex mechanisms.
Solution Approach 2:
The device is designed as a modular component that can be independently attached to the vehicle rear, separating the vortex disruption function from the vehicle structure itself. This segmentation allows for easy installation, removal, and adjustment without modifying the vehicle, reducing overall system complexity while achieving the desired fuel efficiency improvement.
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 system significantly reduces vortex-induced drag, enhancing fuel efficiency and decreasing transportation costs by preventing the formation of trailing edge vortices.
Implementation Method 1
The vortex disruption devices are disposed in adjacently spaced relation and extend away from the vehicle or trailer surface well beyond the fluid dynamic laminar boundary layer formed as the vehicle passes through the air
Implementation Method 2
the air converges into a swirling vortex which produces inherent low pressure drag. This low pressure drag formed at the rear of a trailer
Data Source
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AI summary
A vortex disruption system for vehicles (100) having opposing sides and a roof, and terminating at a rear end (102), said system comprising a plurality of vortex disruption devices (10) adapted to be mounted to said vehicle (100), and in spaced relation with the vehicle rear end (102); each vortex disruption device (10) including a leading end (12), a trailing end (14), and a bottom (20); wherein at least said trailing end (14) or a portion of each of said plurality of vortex disruption devices (10) extends beyond the fluid dynamic boundary layer formed as the vehicle (100) moves through the air; a left-hand planar surface (16) and a right-hand planar surface (16), said planar surfaces (16) originating at said leading end (12), and extending therefrom in diverging and inwardly slanted relation wherein said planar surfaces (16) join along a common upper edge (18).