Motor Vehicle Air Vent Coanda Effect Angle Optimization
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Solution Overview
Problem
Existing air vents for motor vehicles do not reliably direct air flow using the Coanda effect to ensure consistent and controlled air distribution, particularly for vehicle occupants.
Innovation Solution
An air vent design featuring an air directing device inclined between 23° and 27° relative to an adjacent surface, allowing air to flow along the surface via the Coanda effect, with adjustable configurations for varying volumetric flows between 30 m3/h and 700 m3/h, and optionally incorporating a pivotable air directing device and operator parts for enhanced control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air directing device is positioned at a specific inclination angle (23°-27°) to achieve stable Coanda effect, then air flow direction control is improved, but device complexity increases due to precise angular requirements
Solution Approach 1:
The patent applies parameter changes by optimizing the inclination angle within a specific range (23°-27°) to ensure the Coanda effect occurs reliably. This parameter optimization allows the air flow to attach to and follow the adjacent surface effectively, achieving consistent directional control without requiring excessively precise manufacturing tolerances.
2Productivity
If the volumetric flow is increased to improve air distribution effectiveness, then cooling/heating performance is improved, but the stability of Coanda effect decreases at higher flow rates
Solution Approach 1:
The patent addresses this contradiction by optimizing the volumetric flow parameter within a balanced range. The inclination angle of 23°-27° is specifically chosen to maintain Coanda effect stability even at higher flow rates, allowing effective air distribution while preventing flow detachment that would occur at excessively high velocities.
3Ease of operation
If the air directing device is made adjustable to improve operational flexibility, then ease of operation is improved, but device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The patent applies the dynamics principle by making the air directing device adjustable rather than fixed. This allows the inclination angle to be modified according to different operational requirements, providing flexibility in air flow direction control while maintaining the core Coanda effect mechanism.
Solution Approach 2:
The air directing device serves multiple functions: it guides air flow via the Coanda effect, allows adjustment for different directional requirements, and can be integrated into various air vent configurations. This multi-functionality reduces the need for separate adjustment mechanisms.
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
Ensures stable and directed air flow to specific areas, such as the vehicle occupant's hip point, improving comfort and operational simplicity by leveraging the Coanda effect for controlled air distribution.
Implementation Method 1
The air vent according to the invention permits air flowing out of the air exit opening, by way of the Coanda effect, to flow so as to be directed along a surface adjacent the air exit opening
Data Source
AI summary
For air-conditioning within a vehicle interior of a motor vehicle, an air vent is provided with at least one air-directing device located in the region of an air outlet opening. The air vent is configured to allow air flowing out of the air outlet opening to flow, by way of the Coanda effect, in a directed manner along a surface which is adjacent to the air outlet opening. The air-directing device and the adjacent surface are inclined in relation to each other by an angle of inclination which is between 23° and 27°, and the directed air has a volumetric flow of between 30 m3/h and 700 m3/h.