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Particle emission characteristics of a gas turbine with a double annular combustor

Boies, Adam M., Stettler, Marc E. J., Swanson, Jacob J., Johnson, Tyler J., Olfert, Jason S., Johnson, Mark, Eggersdorfer, Max L., Rindlisbacher, Theo, Wang, Jing, Thomson, Kevin, Smallwood, Greg, Sevcenco, Yura, Walters, David Mark, Williams, Paul I., Corbin, Joel, Mensah, Amewu A., Symonds, Jonathan, Dastanpour, Ramin and Rogak, Steven N. 2015. Particle emission characteristics of a gas turbine with a double annular combustor. Aerosol Science and Technology 49 (9) , pp. 842-855. 10.1080/02786826.2015.1078452

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Abstract

The total climate, air quality, and health impact of aircraft black carbon (BC) emissions depend on quantity (mass and number concentration) as well as morphology (fractal dimension and surface area) of emitted BC aggregates. This study examines multiple BC emission metrics from a gas turbine with a double annular combustor, CFM56-5B4-2P. As a part of the SAMPLE III.2 campaign, concurrent measurements of particle mobility, particle mass, particle number concentration, and mass concentration, as well as collection of transmission electron microscopy (TEM) samples, allowed for characterization of the BC emissions. Mass- and number-based emission indices were strongly influenced by thrust setting during pilot combustion and ranged from <1 to 208 mg/kg-fuel and 3 ×× 1012 to 3 ×× 1016 particles/kg-fuel, respectively. Mobility measurements indicated that mean diameters ranged from 7 to 44 nm with a strong dependence on thrust during pilot-only combustion. Using aggregation and sintering theory with empirical effective density relationships, a power-law relationship between primary particle diameter and mobility diameter is presented. Mean primary particle diameter ranged from 6 to 19 nm; however, laser-induced incandescence (LII) and mass-mobility-calculated primary particle diameters demonstrated opposite trends with thrust setting. Similarly, mass-mobility-calculated aggregate mass specific surface area and LII-measured surface area were not in agreement, indicating both methods need further development and validation before use as quantitative indicators of primary particle diameter and mass-specific surface area.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Additional Information: Accepted author version posted online: 07 Aug 2015
Publisher: Taylor & Francis
ISSN: 0278-6826
Date of Acceptance: 10 July 2015
Last Modified: 21 Aug 2019 02:23
URI: http://orca-mwe.cf.ac.uk/id/eprint/76417

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