Vortex Generator Air Deflector for Freight Cab Fouling
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Solution Overview
Problem
Conventional air deflectors for freight vehicles require large dimensions to effectively prevent cab side fouling, leading to increased air resistance, fuel consumption, weight, and cost.
Innovation Solution
A compact vortex generator, such as a substantially vertical guide vane, is used to convert air flow into a vortex flow that adheres to the vehicle side, preventing fouling without increasing air resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional curved shield air deflector is used to prevent cab side fouling, then the degree of fouling is reduced, but the air resistance and vehicle weight increase
Solution Approach 1:
The invention changes the flow regime parameter from simple deflection to vortex flow. By positioning the vortex generator at a specific angle of attack, it creates a controlled vortex that adheres to the cab side through the Coanda effect, providing protective coverage with much smaller dimensions and lower air resistance than conventional deflectors
Solution Approach 2:
The invention uses aerodynamic principles (pneumatics) to create a vortex flow that clings to the vehicle surface. The vortex generator exploits fluid dynamics effects including the Coanda effect (attachment of fluid flow to a convex surface) and vortex breakdown to achieve fouling prevention without the bulk of traditional mechanical shields
2Object-affected harmful factors
If a conventional curved shield air deflector is used to prevent cab side fouling, then the degree of fouling is reduced, but the vehicle weight increases
Solution Approach 1:
The invention transitions from a large-dimensional mechanical shield to a compact vortex-generating structure. The vortex generator creates a three-dimensional vortex flow field that provides extensive protective coverage despite its small physical size, dramatically reducing the weight compared to conventional deflectors
Solution Approach 2:
The invention replaces heavy mechanical structures with aerodynamic flow control. The vortex generator uses air flow manipulation to create a protective vortex shield that weighs fractions of the conventional mechanical deflectors while providing equivalent or superior fouling protection
3Object-affected harmful factors
If a conventional curved shield air deflector is used to prevent cab side fouling, then the degree of fouling is reduced, but the device dimensions increase
Solution Approach 1:
The invention changes from two-dimensional shield geometry to three-dimensional vortex flow structure. The vortex generator creates a vortex that wraps around the cab side, providing extensive protective coverage with minimal generator dimensions. The effective protection area is decoupled from the physical size of the deflector itself
Solution Approach 2:
The invention transitions from planar shield deflection to three-dimensional vortex flow. The vortex generator creates a rotating flow field that extends in multiple dimensions, providing comprehensive cab side protection while the generator itself remains a compact component with small footprint
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 compact vortex generator effectively reduces cab side fouling while maintaining low air resistance, allowing for integration into existing vehicles without redesign, thus optimizing performance and cost.
Implementation Method 1
convert part of the air flow to a vortex flow which follows the vehicle side adjacent to the corner
Implementation Method 2
an air vortex has the ability to cling or be drawn to an adjacent downstream surface
Data Source
Figure 1~3
Figure 4~5
AI summary
Air deflector (50) at a front corner (24, 44) of a cab (20) of a freight vehicle (10). According to the invention the air deflector comprises a vortex generator (50) which forms an angle of incidence, relative to an air flow (f) induced round the corner (24, 44) by movement of the vehicle, in order to convert part of the air flow (f) to a vortex flow (v)which follows a side (26) of the vehicle (10), said side being adjacent to the corner (24, 44),and prevents fouling(dirtying) of the side (26) from below.