CUED Publications database

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

Boies, AM and Stettler, MEJ and Swanson, JJ and Johnson, TJ and Olfert, JS and Johnson, M and Eggersdorfer, ML and Rindlisbacher, T and Wang, J and Thomson, K and Smallwood, G and Sevcenco, Y and Walters, D and Williams, PI and Corbin, J and Mensah, AA and Symonds, J and Dastanpour, R and Rogak, SN (2015) Particle emission characteristics of a gas turbine with a double annular combustor. Aerosol Science and Technology, 49. pp. 842-855. ISSN 0278-6826

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Abstract

Copyright © American Association for Aerosol Research. 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 × 10 12 to 3 × 10 16 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
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:26
Last Modified: 21 Nov 2017 03:12
DOI: