| 内容提要: |
Serious
air pollution and low on-time performance of commercial flights in China could
result in more particles being deposited in the environmental control systems
(ECS) of the commercial airliners and ground air-conditioning carts (GAC). The
particle deposited in the ECS and GAC could cause performance issues of the
airplanes and GAC. In addition, particles penetrated to the aircraft cabin
could cause adverse health impact on the passengers and crew. This
investigation measured the PM2.5 particle concentrations and the quantities of
particles of different sizes at the inlet and outlet of the GAC and ECS in an
MD-82 airplane parked next to Tianjin Airport under different air quality
levels. The results showed that the deposition rate of the PM2.5 mass in the GAC and
ECS was 40-50%, with most (30-40%) of the deposition occurring in the ECS. For
particles with a diameter of 5 μm or larger, the deposition rate was greater
than 90%. For particles with a diameter of 0.5 μm or less, the deposition rate
was less than 25% so they entered into the aircraft cabin. In addition,
particle mass and number concentration was measured on commercial flights. The
results indicated that particle concentrations were high compared with that
during the cruising when the airplanes were on the ground at the Chinese
airports where ambient particle concentrations were also high. |