Variable-Height Spoiler Reducing Aerodynamic Noise
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Solution Overview
Problem
Existing air-directing apparatuses for motor vehicles, such as spoilers and wings, generate disturbing noises due to regular pulsating flow separation and vortices, which are challenging to mitigate effectively with current designs and production constraints.
Innovation Solution
An air-directing apparatus with a basic body that continuously changes height in the transverse direction and incorporates swirling elements with expanding and narrowing intermediate spaces to disrupt flow separation, reducing noise through boundary vortices and accelerated air jets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a spoiler or wing is installed to direct air flow, then air flow management is improved, but disturbing noises are generated due to regular pulsating flow separation and vortices
Solution Approach 1:
The spoiler incorporates varying local heights along its longitudinal extension, with different sections having different heights to disrupt regular flow separation patterns. This local variation in geometry prevents consistent vortex formation while maintaining overall air flow management functionality.
Solution Approach 2:
The invention introduces height variation as an additional dimension to the traditional two-dimensional spoiler design. By varying the height in the vertical dimension along the longitudinal axis, the design disrupts the regular pulsating flow separation that occurs with uniform-height spoilers, thereby reducing noise generation.
2Object-generated harmful factors
If the height of the spoiler is changed over its length to reduce noise, then disturbing noises are reduced, but production capability and design complexity are limited
Solution Approach 1:
The invention changes the geometric parameter of spoiler height along its longitudinal extension to reduce noise. This parameter variation is implemented in a controlled manner that balances noise reduction effectiveness with manufacturability and design simplicity.
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 design significantly reduces disturbing noises by minimizing flow separation and enhancing air flow management, improving driving performance and visibility by strategically placing swirling elements on the air-directing apparatus.
Implementation Method 1
a regularly pulsating flow separation which can be formed at the spoiler or wing
Implementation Method 2
Vortices frequently arise at the rear edge of the spoiler or of the wing
Implementation Method 3
swirling elements which are designed to cause swirling in the air flow directed by the basic body
Implementation Method 4
disturbing noises arise to a lesser extent
Data Source
AI summary
An air directing apparatus for a motor vehicle includes a basic body configured to direct an air flow occurring during operation of the motor vehicle as intended. The basic body has a height that changes continuously in a transverse direction of the motor vehicle.