Experimental analysis of particulate movement in a large Eddy Simulation Chamber

by Padilla, Angelina Marianna

Abstract (Summary)
Millions of people travel by commercial aircraft each year. The close proximity of

passengers aboard an airplane leads to one of the primary reasons that air quality in an aircraft

cabin is of interest. In recent years there have been multiple reported instances of people

contracting illnesses after being aboard an aircraft for an extended period of time. In order to

better understand air quality in an aircraft cabin, an experimental study of particulate transport in

a half cabin model of a Boeing 767 was performed. In the study, both 3[Mu]m and 10[Mu]m particles

were tested separately by injecting them into the cabin through a vertical tube, 609.6 mm (24 in)

above the floor, at a single location on the centerline of the half cabin test section. Resulting

particulate concentrations were measured at five locations along the centerline of the half cabin

test section. It was found that for the 3[Mu]m particles, the normalized concentration was about one

for all of the locations except directly above the injection site. Therefore, the concentrations

were approximately the same as the well-mixed concentration, where the well-mixed

concentration is the concentration in the test cabin if the test cabin is uniformly mixed. For the

same test conditions, the normalized concentrations for the 10[Mu]m particles were well below one,

around 0.1. Several more concentration measurements using the 10[Mu]m particles were taken at

the same five locations, both on and off the centerline, and for different particle injection and

cabin pressure conditions. The concentration results using a diffuser cone to inject the 10[Mu]m

particles into the test cabin and a neutral cabin pressure were higher than the results found using

the straight injection tube, but they were not very repeatable. After pressurizing the cabin to

slightly above ambient pressure and using the diffuser cone, the resulting average normalized

particle concentrations along the centerline were found to be between 0.4 and 1.5 and repeatable

within the estimated measurement uncertainty. Therefore, it appears that the 3[Mu]m particles

follow the airflow in the test cabin well, but it is not clear if the 10[Mu]m particles do as well.

Bibliographical Information:


School:Kansas State University

School Location:USA - Kansas

Source Type:Master's Thesis

Keywords:particle transport indoor particulate movement ventinlated chamber engineering aerospace 0538 environmental 0775


Date of Publication:01/01/2008

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