10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Measurement of Aircraft Engine Soot Emissions using the ESCOM (Engine Soot Compliance Monitor)
Timothy Onasch, Richard Miake-Lye, Fred Bacon, Philip Croteau, William Brown, ANDREW FREEDMAN, Aerodyne Research, Inc.
Abstract Number: 564 Working Group: Instrumentation
Abstract We describe a new device, the Engine Soot Compliance Monitor (ESCOM), that provides a direct readout of the soot mass emission index (mass soot per mass fuel expended) from aircraft engines. The heart of this device is the CAPS PMssa monitor, operating at a measurement wavelength of 780 nm in order to avoid interference from emitted NO2, which provides a highly accurate measurement of soot concentrations when used in conjunction with the soot mass absorption coefficient (MAC). Unlike other soot measurement instruments, it also provides a measurement of the single scattering albedo of the emitted particles. At the low single scattering albedo values found in aircraft engines (0.1-0.3), the CAPS PMssa monitor, which measures optical extinction and scattering, provides a highly accurate measurement of soot concentrations without external calibration. An embedded LiCor CO2 monitor provides the carbon dioxide concentration which is used, along with known fuel composition to calculate the soot mass emission index. The monitor is capable of measuring soot concentrations at levels well below 1 μg m-3 with a response time of 1-2 seconds. We will also present results from the Variant 2-3 campaigns, where emissions from an aircraft engine were measured over a range of operating conditions including different thrust levels and fuel composition. In these two campaigns, an older version of the monitor operating at 630 nm was used.