Vehicle Bonnet Airflow Duct for Drag Reduction and Cooling
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Solution Overview
Problem
Bluff-fronted vehicles, such as SUVs, experience high aerodynamic drag due to their front surfaces, which increases fuel consumption and greenhouse gas emissions, and existing solutions do not effectively address both aerodynamic performance and component cooling simultaneously.
Innovation Solution
An airflow apparatus comprising an airflow duct and a separate cooling duct with outlets in proximity to each other, where airflow from the airflow duct influences the cooling duct, enhancing laminar airflow over the bonnet and reducing pressure to increase cooling efficiency, and a deployable closure system that adjusts based on vehicle parameters to optimize duct operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate ducts are used for aerodynamic flow and cooling flow, then aerodynamic performance can be optimized, but the system complexity increases and the two functions cannot be coordinated efficiently
Solution Approach 1:
The patent combines the aerodynamic duct and cooling duct into a single integrated duct structure. The duct serves dual purposes: guiding aerodynamic flow over the bonnet to reduce drag, and directing cooling air to components in the engine bay. This merging eliminates the need for separate ducts while coordinating both functions through a unified flow path.
Solution Approach 2:
The single duct is designed to perform multiple functions simultaneously. It acts as both an aerodynamic flow guide for drag reduction and a cooling air delivery system. The duct's geometry and positioning allow it to fulfill both roles effectively, making the system more efficient and less complex.
2Temperature
If cooling outlets are placed in the bonnet, then cooling efficiency improves, but aerodynamic drag increases due to disrupted laminar flow
Solution Approach 1:
The duct outlet is positioned at a specific location on the bonnet where it can deliver cooling air effectively while minimizing disruption to the overall laminar flow. The local airflow characteristics at this position are optimized to maintain smooth flow over the bonnet surface while still providing adequate cooling air delivery to the engine bay components.
Solution Approach 2:
The duct outlet is designed with a curved or rounded geometry rather than a sharp edge. This curvature helps the airflow remain attached and smooth as it exits the duct, reducing turbulence and drag. The rounded outlet shape allows cooling air to be delivered effectively while maintaining laminar flow characteristics over the bonnet surface.
3Ease of manufacture
If a fixed duct configuration is used, then manufacturing is simplified, but the system cannot adapt to varying vehicle operating conditions
Solution Approach 1:
The duct configuration is made adjustable rather than fixed. The duct can change its geometry or positioning based on vehicle operating conditions such as speed, temperature, and cooling requirements. This dynamic capability allows the system to optimize both aerodynamic performance and cooling efficiency under varying conditions while maintaining a relatively simple base structure.
Solution Approach 2:
The duct system incorporates movable or adjustable elements that can replicate different flow path configurations based on operational needs. Rather than制造 multiple fixed duct systems, the design uses a single duct structure that can be adjusted to create different flow patterns, effectively copying the functionality of multiple fixed configurations.
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 reduces aerodynamic drag by improving airflow over the vehicle's front surfaces while effectively cooling components, thereby decreasing fuel consumption and emissions, and allows for adaptive operation based on vehicle speed and temperature.
Implementation Method 1
The proximity of the airflow outlet to the cooling outlet is such that, in use, airflow through said airflow outlet may influence airflow through the cooling outlet by reducing pressure at said cooling outlet, for example by creating a region of low pressure at the cooling outlet.
Implementation Method 2
the cooling outlet and/or the airflow outlet is in a bonnet of the vehicle; and in use, airflow exits the airflow outlet substantially parallel said bonnet. This contributes to the desirable laminar airflow over the bonnet.
Data Source
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AI summary
Embodiments of the present invention provide airflow apparatus for a vehicle comprising: an airflow duct extending rearwardly from a front region of said vehicle, the airflow duct having an airflow inlet and an airflow outlet; a cooling duct, separate from the airflow duct, the cooling duct having a cooling inlet and a cooling outlet, wherein the airflow outlet is in proximity to the cooling outlet such that, in use, airflow through said airflow outlet influences airflow through said cooling outlet, the cooling outlet and/or the airflow outlet is in a bonnet of the vehicle and, in use, airflow exits the airflow outlet substantially parallel said bonnet.