An innovative personalized displacement ventilation system for airliner cabins

Area of Science:

• Aerospace Engineering
• Environmental Science
• Building Physics

Background:

• Traditional airliner cabin ventilation systems, such as mixing ventilation with gaspers, are inefficient at controlling contaminant transport.
• Maintaining both a comfortable thermal environment and good air quality is crucial for passenger well-being in aircraft cabins.

Purpose of the Study:

• To propose and evaluate an innovative ventilation system for aircraft cabins designed to minimize contaminant transport and ensure thermal comfort.
• To compare the performance of the proposed system against existing mixing and displacement ventilation strategies.

Main Methods:

• Experimental measurements of air velocity, temperature, and contaminant distribution in a seven-row aircraft cabin mockup.
• Computational Fluid Dynamics (CFD) simulations validated against experimental data.
• Parametric study using CFD to optimize exhaust locations and configurations in a Boeing-737 cabin model.

Main Results:

• The proposed ventilation system demonstrated acceptable air velocity and thermal comfort, with minor localized cold spots near diffusers.
• CFD simulations indicated that the four-exhaust configuration was optimal for contaminant removal.
• The four-exhaust system reduced average cabin contaminant exposure by 57% compared to mixing ventilation and 53% compared to displacement ventilation.

Conclusions:

• The novel ventilation system effectively reduces airborne contaminant exposure in aircraft cabins.
• The four-exhaust configuration offers superior performance in enhancing cabin air quality and maintaining passenger comfort.
• This study provides a validated approach for designing improved ventilation systems for commercial aircraft.