Characterization of Chemicals on Engine Exhaust Particles.

摘要

The object of the work described in this report has been the characterization of particulate-bound chemicals emitted from military aircraft, both as they are emitted and as the exhaust ages. Three Air Force turbine engines (TF33-P3, TF33-P7, and J79C) were examined in this study, using engine test cells at Tinker AFB OK. Emissions were collected at power settings of idle, 30 percent, 75 percent, and injected into smog chambers for subsequent aging. Samples were collected from these chambers periodically during the photochemical experiments to permit measurements of the vapor phase and particle associated photochemical experiments to permit measurements of the vapor phase and particle associated polycyclic aromatic hydrocarbon (PAH) and derivatives under experimental conditions. Throughout the course of the experiments, measurements of the concentrations of total hydrocarbons, NO, NOx, and O3 were made. The samples collected on filter and sorbent media were returned to the laboratory for extraction and analysis by gas chromatography/mass spectrometry (GC/MS) to determine masses of specific target compounds collected. The time profiles of these compounds are presented for the various engines, operating powers, sunlight levels, and photochemical reactivities examines. Keywords: Turbine engine; Aircraft exhaust; Organic emissions; Photochemistry chamber studies; Particle emissions. (KT)