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Positive and negative ion measurements in jet aircraft engine exhaust: concentrations, sizes and implications for aerosol formation [An article from: Atmospheric Environment]

Positive and negative ion measurements in jet aircraft engine exhaust: concentrations, sizes and implications for aerosol formation [An article from: Atmospheric Environment]

enlarge enlarge 		Authors: H. Haverkamp, S. Wilhelm, A. Sorokin, F. Arnold
Publisher: Elsevier
Category: Book

Buy New: $8.95



Format: Html
Media: Digital

ASIN: B000RR1G0O

Publication Date: June 1, 2004
Availability: Available for download now
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Product Description
This digital document is a journal article from Atmospheric Environment, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Positive and negative ions have been measured by the ion mobility analyzer in the exhaust of a jet aircraft engine behind the combustor exit at the ground-level. The operational conditions of the combustor were varied covering two fuel flows (FFs) and three fuel sulfur contents (FSCs). About 50% of the observed ions have mass number m (amu, atomic mass units) larger than 100 and the most massive ions have m up to about 1500-3000 depending on the FF and FSC. Considering such large m, many of these ions must be relatively large molecular ions, as for example polycyclic aromatic hydrocarbons (PAH). Labile cluster ions are unlikely due to the high temperature (about 1000K). Measured ion concentrations referred to standard conditions are n"p=4x10^7-1.7x10^8cm^-^3 (positive ions) and n"n=6x10^7-2.1x10^8cm^-^3 (negative ions). The total ion emission index is E"i=(E"p+E"n)=1.2x10^1^6-2.0x10^1^6 ionskg^-^1 fuel burnt. Emission index E"i increases markedly with FF. For low FF, E"i increases markedly with higher FSC. Our E"i is the same order as was observed for large volatile particles in wakes of a jet aircraft in-flight formed by the ion-induced nucleation followed by the ion-assisted growth of freshly nucleated aerosols.