Comprehensive Measurements of Sub-Micron Particulate Emissions from a Diesel Engine


The size and morphology of sub-micron particulate matter emitted from internal combustion engines are investigated based on thermophoretic sampling experiments followed by direct visual characterizations under transmission electron microscopy. Specifically, measurements are conducted at the exhaust of a diesel engine (6059T John Deere, 5.9 L, 6 cylinder, turbocharged, direct injection). The size distributions of spherules and aggregates are separately measured to obtain the available surface area, which is crucial for estimating the environmental and health impact of particles. Aggregate fractal dimensions and prefactors as well as soot volume fractions are also quantified. Different engine speeds and relative loads are considered to determine the effects of typical engine operating conditions on the particulate properties. The present mean spherule diameters are in the range of 20-40 nanometer, mean aggregate diameters are less than 0.5 micron, and fractal dimensions and prefactors are respectively 1.75 ± 0.15 and 1.7 ± 0.5. These results are consistent with the numerous past studies in various laboratory flames and a recent study in another diesel engine.

Meeting Name

4th Joint Meeting of the U.S. Sections of the Combustion Institute (2005: Mar. 20-23, Philadelphia, PA)


Mechanical and Aerospace Engineering

Document Type

Article - Conference proceedings

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© 2005 Combustion Institute, All rights reserved.

Publication Date

23 Mar 2005

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