Air discharge device
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Solution Overview
Problem
Conventional air discharge devices face limitations in increasing the reaching distance of the working air flow due to air suction actions caused by lateral vortices generated in the velocity boundary layer, which are not effectively suppressed by auxiliary air outlets.
Innovation Solution
The air discharge device incorporates a vortex suppression structure that aligns the central portion of the velocity boundary layer with the mainstream of the support air flow, and a main hole with edges of varying curvature to reduce lateral vortex development, thereby enhancing the reaching distance of the working air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If auxiliary air outlets are provided around the main air outlet to form support air flow, then air suction due to working air flow is suppressed, but the reaching distance of the working air flow cannot be effectively increased
Solution Approach 1:
The invention converts the harmful lateral vortices that cause air suction into beneficial controlled vortices. By strategically positioning auxiliary air outlets to discharge support air flow that interacts with the velocity boundary layer, the system generates controlled rotational flow that redirects the working air flow downward, transforming the harmful suction effect into a beneficial extension of reaching distance
Solution Approach 2:
The invention changes the parameters of the air flow system by controlling the discharge amount of support air flow relative to the working air flow. By optimizing the ratio and distribution of support air flow from auxiliary outlets, the system achieves optimal suppression of air suction while extending the reaching distance of the working air flow to the floor
2Device complexity
If the velocity boundary layer is allowed to develop naturally, then the air flow structure is simple, but lateral vortices develop and reduce the reaching distance
Solution Approach 1:
The invention applies preliminary action by discharging support air flow from auxiliary air outlets before the working air flow reaches the floor. This pre-positioned support air flow interacts with the velocity boundary layer to control vortex development in advance, preventing the harmful lateral vortices from forming and extending the reaching distance
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 configuration effectively suppresses lateral vortices and reduces air suction, leading to a longer reaching distance of the working air flow by minimizing flow velocity attenuation and interference from vortex rings.
Implementation Method 1
a vortex suppression structure configured to suppress development of lateral vortices generated in a velocity boundary layer of the working air flow
Implementation Method 2
lateral vortices generated in a velocity boundary layer of the working air flow at a downstream side of an outlet of the main hole
Implementation Method 3
at least an auxiliary hole provided around the main hole to discharge a support air flow which suppresses an air suction due to the working air flow discharged from the main hole
Data Source
AI summary
An air discharge device is configured to discharge an air flow. The air discharge device includes a main hole for discharging an air flow as a working air flow, an auxiliary hole provided around the main hole to discharge a support air flow, and a vortex suppression structure configured to suppress development of vortices generated in a velocity boundary layer of the working air flow at a downstream side of an outlet of the main hole. This vortex suppression structure is configured to make a central portion of the thickness of the velocity boundary layer of the working air flow at the downstream side of the outlet of the main hole to be closer to a mainstream of the support air flow, at the downstream side of the outlet of the main hole.