Mitigation of cross-contamination in an aircraft cabin via localized exhaust

Abstract Most aircraft cabin ventilation designs currently use a 50% mix of fresh and recirculated, filtered air and supply approximately 8–10 l/s per person. In order to make the most efficient use of the air supply at hand, the 50% of cabin air that is exhausted from the aircraft should remove with it as much contaminant from within the cabin as possible. This will thereby reduce cross-contamination among passengers and improve overall air quality. This study examines the use of localized suction orifices near and around the source occupant to unobtrusively ingest the individual’s thermal plume and exhaust it from the aircraft cabin before contaminants entrained in the plume can significantly mix with the bulk airflow. Through the use of Computational Fluid Dynamics (CFD), various suction seat designs have been tested for their contaminant removal effectiveness and subsequent cross-contamination reduction. CFD results indicate significant improvements over conventional mixing air ventilation systems with a 40–50% decrease in passenger exposure predicted in a conventional coach-class seating arrangement.

[1]  D. R. Marr,et al.  Length Scale Propagation Along a Joint Inlet and Thermal Buoyancy Driven Flow , 2006 .

[2]  Tengfei Zhang,et al.  Novel air distribution systems for commercial aircraft cabins , 2007 .

[3]  S. Kato,et al.  CFD Analysis of a Thermal Plume and the Indoor Air Flow Using k-ε Models with Buoyancy Effects , 2000 .

[4]  J. Niu,et al.  Transient CFD simulation of the respiration process and inter-person exposure assessment , 2005, Building and Environment.

[5]  M Dechow,et al.  Concentrations of selected contaminants in cabin air of airbus aircrafts. , 1997, Chemosphere.

[6]  Peter Strøm-Tejsen,et al.  Ozone-initiated chemistry in an occupied simulated aircraft cabin. , 2007, Environmental science & technology.

[7]  Yigang Sun,et al.  Experimental characterization of airflows in aircraft cabins, Part II: Results and research recommendations. Discussion , 2005 .

[8]  J D Spengler,et al.  Air quality in aircraft , 2003 .

[9]  William W. Nazaroff,et al.  Ozone consumption and volatile byproduct formation from surface reactions with aircraft cabin materials and clothing fabrics , 2008 .

[10]  S. Kato,et al.  Study on transport characteristics of saliva droplets produced by coughing in a calm indoor environment , 2006 .

[11]  Shinsuke Kato,et al.  Benchmark Test for a Computer Simulated Person , 2003 .

[12]  Henrik Brohus,et al.  Personal Exposure to Contaminant Sources in Ventilated Rooms , 1997 .

[13]  S. Hulley,et al.  Aircraft cabin air recirculation and symptoms of the common cold. , 2002, JAMA.

[14]  James P Rydock.  Tracer study of proximity and recirculation effects on exposure risk in an airliner cabin. , 2004, Aviation, space, and environmental medicine.

[15]  Ryan K. Dygert,et al.  Modeling of the human body to study the personal micro environment , 2009 .

[16]  Jianlei Niu,et al.  Personalized Ventilation for Commercial Aircraft Cabins , 2007 .

[17]  D. Wyon,et al.  Factors affecting ozone removal rates in a simulated aircraft cabin environment , 2006 .

[18]  R. Huang,et al.  The capture envelope of a flanged circular hood in cross drafts. , 2001, AIHAJ : a journal for the science of occupational and environmental health and safety.

[19]  O. Jolliet,et al.  Defining intake fraction. , 2002, Environmental science & technology.

[20]  Christopher Nicholas Sideroff.  Detailed examinations of the human micro-environment by CFD , 2009 .

[21]  Yuanhui Zhang,et al.  Tracer study of airborne disease transmission in an aircraft cabin mock-up , 2006 .

[22]  Chao-Hsin Lin,et al.  Optimal Sensor Placement for Airborne Contaminant Detection in an Aircraft Cabin , 2007 .

[23]  M R Flynn,et al.  Capture efficiency of flanged circular local exhaust hoods. , 1986, The Annals of occupational hygiene.

[24]  Yuanhui Zhang,et al.  Experimental study of ventilation effectiveness and air velocity distribution in an aircraft cabin mockup , 2008 .

[25]  Wei Yan,et al.  Experimental and CFD study of unsteady airborne pollutant transport within an aircraft cabin mock-up , 2009 .

[26]  Zhao Zhang,et al.  Experimental and numerical investigation of airflow and contaminant transport in an airliner cabin mockup , 2009 .