Real-time measurements of jet aircraft engine exhaust.
Particulate-phase exhaust properties from two different types of ground-based jet aircraft engines--high-thrust and turboshaft--were studied with real-time instruments on a portable pallet and additional time-integrated sampling devices. The real-time instruments successfully characterized rapidly changing particulate mass, light absorption, and polycyclic aromatic hydrocarbon (PAH) content. The integrated measurements included particulate-size distributions, PAH, and carbon concentrations for an entire test run (i.e., "run-integrated" measurements). In all cases, the particle-size distributions showed single modes peaking at 20-40nm diameter. Measurements of exhaust from high-thrust F404 engines showed relatively low-light absorption compared with exhaust from a turboshaft engine. Particulate-phase PAH measurements generally varied in phase with both net particulate mass and with light-absorbing particulate concentrations. Unexplained response behavior sometimes occurred with the real-time PAH analyzer, although on average the real-time and integrated PAH methods agreed within the same order of magnitude found in earlier investigations.
Division of Atmospheric Sciences, Desert Research Institute, Reno, NV, USA.
Fred
F
Rogers
Pat
P
Arnott
Barbara
B
Zielinska
John
J
Sagebiel
Kerry E
KE
Kelly
David
D
Wagner
JoAnn S
JS
Lighty
Adel F
AF
Sarofim
D000393:Air Pollutants / Q000032:analysis*; D000401:Aircraft; D004784:Environmental Monitoring / Q000379:methods*; D010316:Particle Size; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D012680:Sensitivity and Specificity; D001335:Vehicle Emissions / Q000032:analysis*
D000393:Air Pollutants; D011084:Polycyclic Aromatic Hydrocarbons; D001335:Vehicle Emissions