Abstract View
Laboratory Evaluation of the Volatility of Nanoparticles Generated from Jet Engine Lubrication Oil
NOBUYUKI TAKEGAWA, Anna Nagasaki, Tokyo Metropolitan University
Abstract Number: 320
Working Group: Combustion
Abstract
The characterization of particle emissions from jet aircraft is an important issue in the assessment of the aviation impacts on climate and human health. In the method for measuring non-volatile particles from turbofan engines, a volatile particle remover (VPR) heated to 350°C is generally employed to vaporize volatile compounds such as sulfate and organics. Tetracontane (C40) is used as a test compound for evaluating the removal efficiency of volatile particles in VPRs. Recent studies have shown that the formation of nanoparticles from jet engine lubrication oil could be an important source of aerosol particles in aircraft emissions under real-world operating conditions. We investigated the volatility of nanoparticles generated from unused jet engine lubrication oil (Mobil Jet Oil II), triacontane (C30), and C40. The particle number fraction remaining downstream of a custom-made evaporation tube was measured using an ultrafine condensation particle counter (UCPC; Model 3776, TSI) and a condensation particle counter (CPC; Model 3771, TSI) for initial particle diameters of 30 and 50 nm. The temperature of the evaporation tube was varied from room temperature (~20°C) to 400°C, and the temperature dependency of the particle number fraction remaining was derived for the C30, C40, and jet engine lubrication oil particles. The experimental results suggest that the volatility of the lubrication oil particles was comparable to that of the C40 particles, and that the lubrication oil particles could be entirely removed at the tube temperature of >250°C. The temperature profile of sample air inside the evaporation tube was measured separately from the volatility experiments. The evaporation time scale of the C40 particles was simulated using the measured temperature profile and a simple mass transfer equation to interpret the experimental data.