Vortex Disruption Devices for Trailer Drag Reduction
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Solution Overview
Problem
Existing devices fail to effectively disrupt the trailing vortex created by air flow around vehicles with non-tapered rear ends, leading to significant pressure drag and reduced vehicle efficiency, which increases transportation costs.
Innovation Solution
The use of vortex disruption devices positioned beyond the fluid dynamic laminar boundary layer, extending from the trailing edge of vehicles, dispersing airflow and preventing the formation of low-pressure vortices, with both fixed and mechanically actuated configurations available for installation on various vehicle types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If vortex disruption devices are positioned beyond the boundary layer to prevent vortex formation, then drag is reduced and fuel efficiency is improved, but device complexity and installation requirements increase
Solution Approach 1:
The vortex disruption device is divided into multiple independent elements (10) that can be individually positioned and adjusted. Each element consists of simple planar surfaces that can be separately secured to the trailer, allowing the system to achieve complex flow disruption patterns through simple modular components rather than a single complex structure.
Solution Approach 2:
The device transitions from two-dimensional surface-mounted vortex generators to three-dimensional structures that extend beyond the boundary layer. The planar surfaces are oriented at specific angles and positioned at various heights to create three-dimensional flow disruption patterns that effectively prevent vortex formation in the wake region.
2Object-affected harmful factors
If vortex disruption devices extend well beyond the boundary layer, then vortex formation is effectively prevented, but the devices create additional structural requirements and installation complexity
Solution Approach 1:
The vortex disruption elements utilize thin planar surfaces that can be easily manufactured and installed. These flexible-looking structures (which may be rigid or flexible materials) extend beyond the boundary layer to disrupt vortex formation while maintaining simplicity in manufacturing and installation through their thin-film-like construction.
Solution Approach 2:
The planar surfaces are oriented at specific angles and curved configurations to optimize flow disruption. The surfaces may be flat or slightly curved to achieve the desired aerodynamic effect while maintaining manufacturing simplicity, avoiding complex three-dimensional curved surfaces that would be difficult to manufacture.
3Object-affected harmful factors
If multiple vortex disruption devices are positioned in spaced relation, then airflow convergence is effectively prevented, but device complexity and installation time increase
Solution Approach 1:
The system uses multiple segmented vortex disruption elements positioned in spaced relation along the trailer. Each element is independently installable and positioned to disrupt airflow convergence at different locations, preventing vortex formation through distributed rather than centralized intervention.
Solution Approach 2:
The vortex disruption elements are pre-positioned and pre-oriented at specific angles and spacings to optimally disrupt airflow convergence before vortex formation can occur. This preliminary configuration of multiple elements ensures effective drag reduction while allowing for standardized installation procedures that reduce on-site installation time.
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 solution significantly reduces drag and enhances fuel efficiency by inhibiting the formation of low-pressure vortices behind vehicles, thereby minimizing transportation costs and improving vehicle performance.
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. Once installed the vortex disruption devices disperse the air flowing over the disrupter while allowing air to flow normally through the spaces between the devices. The vortex disruption devices thereby inhibit the natural convergence of airflow and prevent the formation of a low-pressure vortex beyond the trailing edge of the vehicle.
Data Source
AI summary
Vortex disruption apparatus are permanently or removably installed or attached to cargo and passenger vans, busses, box-trucks, tractor-trailer combinations, or any other vehicle to increase transportation efficiency by reducing drag by minimizing the formation of trailing end vortex flow. A plurality of vortex disruption devices is disposed in proximity to the trailing end of a cargo trailer and in adjacently spaced relation whereby they extend away from the vehicle or trailer surface well beyond the fluid dynamic laminar boundary layer formed as the vehicle passes through the air. Once installed the vortex disruption devices disperse the air flowing over the disrupter while allowing air to flow normally through the spaces between the devices. The vortex disruption devices thereby inhibit the natural convergence of airflow and prevent the formation of a low-pressure vortex beyond the trailing edge of the vehicle.