Air discharge device
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Solution Overview
Problem
Conventional air discharge devices struggle to increase the reaching distance of a working air flow due to the attenuation caused by lateral vortices in the velocity boundary layer, which are not effectively suppressed by auxiliary air outlets alone.
Innovation Solution
Incorporating a separation structure that reduces the thickness of the velocity boundary layer by separating the central portion of the working air flow from the center line of the main hole, using features like enlarged portions, contraction fins, and uneven surfaces within the air discharge unit to minimize flow velocity differences and suppress lateral vortices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary air outlets are provided around the main hole to form support air flow, then the suction of air drawn into the working air flow is reduced, but the reaching distance of the working air flow cannot be sufficiently increased due to attenuation from lateral vortices
Solution Approach 1:
The air discharge device segments the flow control into two independent parts: auxiliary air outlets for suppressing air suction and a separation structure (contraction fin or enlarged portion) for controlling velocity boundary layer. This segmentation allows each component to address its specific function without interfering with the other, enabling both air suction suppression and reaching distance extension to be achieved simultaneously
Solution Approach 2:
The separation structure acts as an intermediary element between the main hole and the velocity boundary layer. By introducing this intermediate component (contraction fin or enlarged portion), the patent mediates the interaction between the working air flow and the velocity boundary layer, reducing the harmful effects of lateral vortices while maintaining the beneficial support air flow from auxiliary outlets
2Length of moving object
If the velocity boundary layer thickness is reduced to suppress lateral vortices, then the reaching distance is increased, but the structural complexity increases due to additional separation structures
Solution Approach 1:
The patent merges the separation structure with either the main hole or the auxiliary air outlets to form an integrated air discharge unit. The contraction fin is merged with the auxiliary air outlet structure, while the enlarged portion is merged with the main hole structure. This merging reduces the number of separate components and simplifies manufacturing while maintaining the velocity boundary layer control function
Solution Approach 2:
The separation structure serves multiple functions simultaneously: it reduces velocity boundary layer thickness to suppress lateral vortices, maintains flow velocity in the central portion of the working air flow, and works cooperatively with the auxiliary air outlets to suppress air suction. This multi-functionality reduces the need for additional dedicated components, thereby reducing overall structural complexity
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 approach effectively extends the reaching distance of the working air flow by reducing the attenuation caused by lateral vortices, allowing the air to travel further with maintained velocity and temperature consistency.
Implementation Method 1
a separation structure configured to separate a central portion of a thickness of a velocity boundary layer of the working air flow from a center line of the main hole at a downstream side of an outlet of the main hole
Implementation Method 2
using features like enlarged portions, contraction fins, and uneven surfaces within the air discharge unit to minimize flow velocity differences and suppress lateral vortices
Data Source
AI summary
An air discharge device includes an air discharge unit for discharging an air flow. The air discharge unit includes at least one main hole from which an air flow is blown out as a working air flow, and a separation structure configured to separate a central portion of a thickness of a velocity boundary layer of the working air flow from a center line of the main hole at a downstream side of the main hole.