Soot Formation Transients in Engine Emissions


Nanoparticles are emitted from a variety of combustion sources. These particles have been reported to have strong impacts on our environment and human health. There is a growing concern, internationally, on the environmental impact of jet engine exhaust emissions in the atmosphere. Fundamentally, soot emission from combustion sources is dictated by the competing surfaces processes of growth and oxidation. Soot particles formed during fuel combustion and emitted metallic particles constitute the solid (nonvolatile) particle fraction present in exhaust plumes. UMR has developed a mobile facility capable of sampling jet and rocket engine exhaust emissions, including both particulate and gas phase species, and has deployed it in numerous ground test and airborne campaigns. Normally emissions measurements are taken with the engine in a stable operating condition. Here we report on soot (nonvolatile) emissions transients which occur during throttle changes and hence between stable operating conditions. These transients may deviate substantially from the stable condition values in both positive and negative directions. The time scale for decay of the emissions transients is longer than that required for the engine to reach mechanical equilibrium.

Meeting Name

American Physical Society (2004: Mar. 22-26, Montreal, Quebec, Canada)



Second Department


Keywords and Phrases

Engine Emissions; Soot Formation

Document Type

Article - Conference proceedings

Document Version


File Type





© 2004 American Physical Society (APS), All rights reserved.

Publication Date

01 Jan 2004

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