Aircraft Engine Compartment Ventilation Offset Distributor
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Solution Overview
Problem
Conventional aircraft engine compartment ventilation devices suffer from significant pressure drops due to the air distributor, leading to reduced ventilation performance and increased parasitic drag, which necessitates larger fire extinguishing systems and increased aircraft mass.
Innovation Solution
The ventilation device features an offset air distributor independent of the air diffuser, positioned within the compartment, allowing for reduced pressure drops and optimized air flow distribution, with the distributor secured to the nacelle or engine casing to withstand vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the air distributor is integrated with the air diffuser in a one-piece element, then the device structure is simplified, but significant pressure drops are generated in the air distribution path
Solution Approach 1:
The ventilation device is divided into separate functional components: the air collector, air diffuser, and air distributor are independent elements rather than a one-piece integrated structure. This segmentation allows each component to be optimized independently, reducing unnecessary pressure drops while maintaining structural simplicity.
Solution Approach 2:
The air distributor is extracted from the air diffuser assembly and positioned as a separate component within the compartment. This extraction eliminates the pressure drops that would occur in the integrated one-piece element, as the distributor can be optimally positioned to minimize flow resistance.
2Productivity
If the air collector intake dimensions are increased to compensate for pressure drops, then ventilation performance is maintained, but parasitic drag on the aircraft increases
Solution Approach 1:
Instead of increasing the collector intake to compensate for pressure drops, the invention uses the offset distributor design to actually reduce pressure drops. This converts the potential harm of pressure drops into a benefit, allowing smaller collector dimensions while maintaining ventilation performance and reducing parasitic drag.
3Volume of moving object
If the air distributor is positioned close to the air diffuser, then the device compactness is improved, but pressure drops increase due to flow deflection angles
Solution Approach 1:
The air distributor is positioned in a different spatial dimension relative to the air diffuser, creating an offset arrangement. This dimensional separation allows the distributor to be positioned optimally within the compartment to minimize flow deflection angles and pressure drops, while maintaining compact overall device dimensions.
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 reduces pressure drops, enhances ventilation efficiency, and allows for more precise air flow orientation, minimizing the need for larger air collectors and reducing parasitic drag on the aircraft.
Implementation Method 1
the air flow is captured by the air manifold by pressure difference between the air pressure outside and the air pressure inside the compartment
Data Source
Figure 1~2
AI summary
A ventilation device (1) for a compartment (4), preferably for a compartment (4) of an aircraft engine (2), the device comprising an air collector (11) adapted to capture an airflow (F) outside said compartment (4), an air diffuser (12) adapted to guide said airflow (F) inside said compartment (4), and an air distributor (13) adapted to distribute the airflow (F) inside said compartment (4), device in which the air distributor (13) is offset from the air diffuser (12), the air distributor (13) being disposed inside the compartment (4) at a distance from the air diffuser (12).