United States Department of Transportation
i
Aqueous Ethanol Ignition and Engine Studies, Phase I
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2010-09-01
[PDF-2.83 MB]
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TRIS Online Accession Number:01337273
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Edition:Final Report: August 2009 - September 2010
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Abstract:The authors' objectives were to design a micro-dilution tunnel for monitoring engine emissions, measure ignition temperature and heat release from ethanol-water-air mixtures on platinum, and initiate a computational fluid dynamics model of a catalytic igniter. All three efforts progress the understanding of catalytic ignition of alternative transportation fuels. The dilution tunnel used an ejector dilutor to entrain gases and mix them with exhaust. A portable gas analyzer and particle mass monitor sensed gaseous and particulate emissions. The transportable tunnel met design criteria including a user-friendly interface and can accommodate more sophisticated gas analyzers. The surface temperature and heat generation from reactions of ethanol-water-oxygen-nitrogen mixtures on the catalyst were determined using microcalorimetry. Ignition temperatures varied from 380 K to 570 K and heat generation from 0.8 to 11.8 W/cm2 depending on the relative and absolute amounts of ethanol and oxygen. Water showed little to no effect on either the ignition temperature or the heat generation. The authors used a Fluent® finite volume program to model flow during the filling of a catalytic igniter. To gain confidence in modeling, a series of progressively more difficult fluid mechanics problems were solved first. This initial model is an open system with a pressure inlet. Future models will represent a closed mass system with a moving boundary.
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