Correction for Particle Loss in a Regulatory Aviation Nvpm Emissions System Using Measured Particle Size

Characterizing and Predicting nvPM Size Distributions for Aviation Emission Inventories and Environmental Impact

“…Additionally, the number concentration reported by the sizing instruments was normalized to the concentration reported by the AVL APC (corrected for additional losses in the APC). Although recent comparisons on an RQL rig have shown excellent agreement (slopes within 5% of the 1:1 line) of the number concentrations reported by the AVL APCs and the sizing instruments in the EUR and CHF systems, 40 the agreement during the engine tests over the years varied with slopes within 25% of the 1:1 line. Details of the density calculation and comparison with the values obtained with the number concentration reported by the sizing instruments can be found in Section S4 of the Supporting Information.…”

“…17,18 Comparisons on the aforementioned combustor rig showed that both instruments agreed within a 5% margin for GMD and GSD. 10,40 Notably, this study did not include a catalytic stripper (CS) for removing volatile compounds upstream of the size analyzers. The standardized nvPM sampling system with heated lines and rapid dilution suppresses the formation of volatile PM when the system is operated correctly and without any unburned fuel or oil contamination.…”

“…14 Recent comparisons of these systems using a rich-burn/quickquench/lean-burn (RQL) combustor rig with varied jet fuel blends highlighted excellent agreement of emission indices after joint calibration: less than 3% for nvPM mass and under 1% for nvPM number across all conditions and fuels. 40 Particle Size Distribution Measurement. The EUR system used a Cambustion DMS500 fast particle size spectrometer (10 Hz) for PSD measurements from 5 to 1000 nm processed using the monomodal aggregate inversion matrix generated using mini-CAST soot.…”