Aircraft Cabin Airflow Diffuser Using Coanda Effect
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Solution Overview
Problem
Conventional airflow management systems in aircraft cabins are inadequate in effectively mitigating the spread of airborne pathogens, highlighting the need for improved strategies to control contamination.
Innovation Solution
The proposed system includes an environmental control system with ducts, valves, and a diffuser that induces airflow along a convex surface under the Coandă effect, combined with an airflow deflector to direct air flow efficiently from the top of the cabin to the bottom, potentially passing through passenger service units and exhausting air through a HEPA-filtered recirculation module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional airflow management systems are used, then the system structure is simple, but the ability to mitigate airborne pathogen spread is insufficient
Solution Approach 1:
The airflow control system is segmented into multiple independently controllable ducts, each with its own valve. This allows precise control of airflow to different cabin zones, enabling targeted pathogen mitigation while maintaining manageable system complexity through modular design
Solution Approach 2:
The system changes airflow parameters (direction, velocity, distribution) dynamically through electronically controlled valves in each duct. This enables adaptive airflow management that can respond to contamination events, improving pathogen mitigation capability while the electronic control keeps complexity manageable
2Reliability
If airflow is directed through multiple passenger service units, then pathogen spread is reduced, but airflow path length increases
Solution Approach 1:
The system applies different airflow treatment strategies to different local zones (passenger service units) based on contamination risk. Airflow can be directed through multiple units when needed for cross-contamination prevention, while the localized control through individual duct valves prevents unnecessary long airflow paths, optimizing both safety and efficiency
3Use of energy by moving object
If recirculation is increased, then energy efficiency improves, but pathogen transmission risk increases
Solution Approach 1:
The recirculation system is made dynamic with controllable valves that can adjust or stop recirculation flow based on contamination detection. This allows the system to maximize energy efficiency during normal operation while quickly switching to fresh air-only modes when pathogen contamination is detected, resolving the contradiction between energy efficiency and safety
Solution Approach 2:
The system incorporates feedback control where airflow patterns and contamination levels are monitored, and recirculation is adjusted accordingly. When contamination is detected, the feedback loop reduces or eliminates recirculation to prevent pathogen transmission, while maintaining energy efficiency during clean conditions
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 minimizes the spread of pathogens by strategically directing airflow from the top to the bottom of the cabin, reducing recirculation and enhancing filtration, thereby reducing the transmission of airborne contaminants.
Implementation Method 1
the diffuser can be configured to induce the airflow to flow along a convex outer surface of the overhead bin under the Coandă effect
Data Source
AI summary
In accordance with at least one aspect of this disclosure, a system includes, an environmental control system (ECS) having a plurality of ducts configured to convey a flow of air into an interior space through the plurality of ducts, a plurality of valves disposed in the plurality of ducts to control the flow of air through a respective duct into the interior space, an overhead bin mounted in the interior space below the plurality of ducts relative to the direction of airflow, and a diffuser disposed at an outlet of the plurality of duct configured to induce the airflow to flow along a convex outer surface of the overhead bin.