Aircraft Conduit Interception Device for Noise Reduction
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Solution Overview
Problem
Noise is generated by foreign bodies at air outlet ports of air distribution systems in air-conditioning installations, particularly in aircraft cabins, disrupting comfort.
Innovation Solution
A conduit piece with a bent portion featuring a large and small bend radius, equipped with an interception device containing interception pockets and a grid to capture foreign bodies, such as ice particles, by utilizing centrifugal forces and airflow to direct them into interception pockets for removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If foreign bodies are allowed to pass through the air distribution conduit, then the air flow remains unobstructed, but noise is generated at the air outlet port
Solution Approach 1:
The air distribution conduit is divided into segments with different bend radii (large bend radius region and small bend radius region), and interception pockets are introduced as separate functional elements within the conduit structure. This segmentation allows the conduit to simultaneously maintain airflow while capturing foreign bodies, resolving the contradiction between unobstructed flow and noise prevention.
Solution Approach 2:
Interception pockets are introduced as intermediary structures within the air distribution conduit. These pockets act as mediators that capture foreign bodies (ice particles) before they reach the air outlet port, thereby preventing noise generation without significantly obstructing the main airflow path.
2Object-affected harmful factors
If an interception device is added to the air distribution conduit, then foreign bodies are captured, but the flow cross section is reduced
Solution Approach 1:
The interception pockets are strategically positioned in the large bend radius region where the airflow velocity is lower and centrifugal forces naturally direct foreign bodies toward the inner wall. This local positioning allows foreign body capture without significantly impacting the main airflow path, thus resolving the contradiction between capture efficiency and flow rate.
Solution Approach 2:
The interception pockets extend radially into the flow path, utilizing the radial dimension to capture foreign bodies without creating a substantial obstruction in the axial flow direction. This dimensional approach allows the pockets to intercept particles while maintaining adequate flow cross-section for air movement.
3Ease of manufacture
If the conduit piece is designed as a single integrated component, then manufacturing is simplified, but retrofitting existing systems becomes difficult
Solution Approach 1:
The conduit piece is designed as a modular component that can be inserted into existing air distribution conduits. This segmented design allows the interception device to be added as a separate unit rather than requiring complete replacement of the existing system, thus enabling retrofitting while maintaining manufacturing simplicity.
Solution Approach 2:
The conduit piece design incorporates universal features that allow it to function both as a new installation component and as a retrofitting element. The standardized interface and modular structure enable the same component to serve multiple purposes: as part of new system construction and as an upgrade to existing systems.
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
Effectively prevents noise generation at air outlet ports by capturing and removing foreign bodies, ensuring quieter operation and ease of installation in existing systems.
Implementation Method 1
The air stream passing through the grid is braked
Implementation Method 2
utilizing centrifugal forces and airflow to direct them into interception pockets
Data Source
AI summary
A conduit piece for the absorption of foreign bodies in an air distribution conduit of an air-conditioning installation, with a bent portion, the inner wall (I) of which has a large bend radius (Rg) and a small bend radius (Rk). To avoid flow noises according to the invention, an interception device (1, 10, 11, 13, 14) be provided in the region of the large bend radius (Rg) for the purpose of intercepting foreign bodies carried through the conduit piece together with the air.