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Effective density and mass-mobility exponent of aircraft turbine particulate matter

Johnson, Tyler J., Olfert, Jason S., Symonds, John P.R., Johnson, Mark P,, Rindlisbacher, Theo, Swanson, Jacob J., Boies, Adam M., Thomson, Kevin, Smallwood, Greg, Walters, David Mark, Sevcenco, Yura, Crayford, Andrew Philip, Dastanpour, Ramin, Rogak, Steven N., Durdina, Lukas, Bahk, Yeon Kyoung, Brem, Benjamin and Wang, Jing 2015. Effective density and mass-mobility exponent of aircraft turbine particulate matter. Journal of Propulsion and Power 51 (6) , pp. 1309-1319. 10.2514/1.B35367

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Abstract

A centrifugal particle mass analyzer and a modified differential mobility spectrometer were used to measure the mass and mobility of particulate matter emitted by CFM56-5B4/2P, CFM56-7B26/3, and PW4000-100 gas turbine engine sources. The mass-mobility exponent of the particulate matter from the CFM56-5B4/2P engine ranged from 2.68 to 2.82, whereas the effective particle densities varied from 600 to 1250  kg/m3, depending on the static engine thrust and sampling methodology used. The effective particle densities from the CFM56-7B26/3 and PW4000-100 engines also fell within this range. The sample was conditioned with or without a catalytic stripper and with or without dilution, which caused the effective density to change, indicating the presence of condensed semivolatile material on the particles. Variability of the determined effective densities across different engine thrusts, based on the scattering about the line of best fit, was lowest for the diluted samples and highest for the undiluted sample without a catalytic stripper. This variability indicates that the relative amount of semivolatile material produced was engine thrust dependent. It was found that the nonvolatile particulate matter, effective particle density (in kilograms per cubic meter) of the CFM56-5B4/2P engine at relative thrusts below 30% could be approximated using the particle mobility diameter (dme in meters) with 11.92d(2.76−3)me.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TD Environmental technology. Sanitary engineering
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Publisher: American Institute of Aeronautics and Astronautics
ISSN: 0748-4658
Date of First Compliant Deposit: 23 January 2019
Date of Acceptance: 28 September 2014
Last Modified: 18 Oct 2019 12:57
URI: http://orca.cf.ac.uk/id/eprint/69094

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