Browse Publications Technical Papers 2009-01-1908
2009-06-15

Impact of Butanol and Other Bio-Components on the Thermal Efficiency of Prototype and Conventional Engines 2009-01-1908

A collaborative study to evaluate the maximum achievable thermal efficiency of a spark ignited engine has been conducted using a range of gasoline and advanced biogasoline fuels, including isomers of butanol. Engines used in this study included an Atkinson cycle 1.5l and prototype 1.8l lean boosted engine. This study was the first stage of an objective to establish practical and implementable routes to minimising well-to-wheels CO2 emissions from liquid hydrocarbon fuels in these engines.
A fuel matrix was designed to assess the effects of variations in volatility, octane and bio-component level and type.
Performance and emissions tests were conducted over a range of engine operating conditions. Thermal efficiency was mapped at stoichiometric and lean conditions, and the limit of lean combustion was established for the different fuels. A maximum steady-state thermal efficiency of 42.9% was achieved on the lean boosted engine.
Both the Atkinson cycle engine and the lean boosted engine appeared relatively insensitive to the various properties of the test gasoline formulations used other than octane.
The butanol blends offered measurable gains in thermal efficiency in line with the relative octane lift over the base gasoline. These fuels, together with a high volatility fuel, were amongst the lowest NOx emitters. Importantly, the butanol blends allowed the greatest volume of crude derived gasoline displacement at fixed fuel oxygen content.
The results obtained enabled a simulation of the tank-to-wheels CO2 contribution of the various fuels in a hybrid version of the lean boosted prototype engine.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Dyno Test Investigations of Gasoline Engine Fueled with Butanol-Gasoline Blends

2009-01-1891

View Details

TECHNICAL PAPER

The Impact of Fuel Composition on the Combustion and Emissions of a Prototype Lean-Boosted PFI Engine

2010-01-2094

View Details

JOURNAL ARTICLE

A Study of Gasoline-Alcohol Blended Fuels in an Advanced Turbocharged DISI Engine

2009-01-0138

View Details

X