Investigation of an anti-knock index and hydrocarbon emissions of various natural gas blends.
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2016-04-01
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Abstract:The North American rail industry is examining the use of natural gas to reduce fuel costs for locomotives that are powered by dual
fuel engines. This report evaluates the ability of an existing methane number algorithm to predict rapid combustion in a dual fuel
engine. The Methane Number index, which quantifies the propensity of a gaseous fuel to autoignite, has the ability to well-characterize
engine knock in spark-ignited combustion. However, the ability of the methane number, which was originally
developed for spark-ignited engines, to predict a fuel’s “knock” behavior in dual fuel combustion is not fully understood.
Specialized natural gas fuel blends are tested in a dual fuel engine and induced to rapid combustion. For fuels that should exhibit
similar knock behavior, the transitions to rapid combustion occurred at significantly different conditions. This demonstrated that
the existing methane number algorithm, while excellent for spark-ignited engines, did not fully predict the propensity for rapid
combustion to occur in a dual fuel engine within the scope of this study. In its current form, a methane number algorithm can be
used to conservatively rate dual fuel engines. It is possible that a new reactivity index for dual fuel combustion might allow ratings
to be less conservative.
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