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Using Engine Experiments to Isolate Fuel Equivalence Ratio Effects on Heat Release in HCCI Combustion
Technical Paper
2010-01-2189
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Detailed combustion studies have historically been conducted in
simplified reacting systems, such as shock-tubes and rapid
compression machines. The reciprocating internal combustion engine
presents many challenges when used to isolate the effects of fuel
chemistry from thermodynamics. On the other hand, the conditions in
such engines are the most representative in terms of pressure and
temperature histories. This paper describes the use of a
single-cylinder research engine as an advanced reactor to better
determine fuel effects experimentally. In particular, a
single-cylinder engine was operated in a manner that allowed the
effects of changes in charge composition and temperatures to be
isolated from changes in equivalence ratio. An example study is
presented where the relative effects of low-temperature and
high-temperature chemistry, and their effects on combustion
phasing, are isolated and examined. A single-zone homogeneous model
based on Chemkin™ code with detailed chemistry was interrogated
to better understand some of the trends identified.
The engine was operated in HCCI mode under both steady-state
conditions and in an alternate-fired mode. The technique allows the
effect of fuel/air equivalence ratio to be isolated from other
parameters such as trapped residual content and wall temperatures.
The Chemkin™ model was run with a 5-component mechanism from the
Reaction Design Model Fuels Consortium and was calibrated using
data from the steady-state engine tests. Results showed good
correlation with combustion start and phasing for both the low- and
high-temperature zones. The model was then used to explain the
relationship between energy released and equivalence ratio in both
the low- and high-temperature regimes.
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Citation
Babiker, H., Mathieu, O., Amer, A., Viollet, Y. et al., "Using Engine Experiments to Isolate Fuel Equivalence Ratio Effects on Heat Release in HCCI Combustion," SAE Technical Paper 2010-01-2189, 2010, https://doi.org/10.4271/2010-01-2189.Also In
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