Journal
ENERGY
Volume 52, Issue -, Pages 55-65Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2012.12.032
Keywords
Inter-cycle variability; Ethanol fumigation; In-cylinder pressure; Diesel engine
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Funding
- Australian Research Council [LP0775178]
- Australian Research Council [LP0775178] Funding Source: Australian Research Council
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The effects of ethanol fumigation on the inter-cycle variability of key in-cylinder pressure parameters in a modern common rail diesel engine have been investigated. Specifically, maximum rate of pressure rise, peak pressure, peak pressure timing and ignition delay were investigated. A new methodology for investigating the start of combustion was also proposed and demonstrated-which is particularly useful with noisy in-cylinder pressure data as it can have a significant effect on the calculation of an accurate net rate of heat release indicator diagram. Inter-cycle variability has been traditionally investigated using the coefficient of variation. However, deeper insight into engine operation is given by presenting the results as kernel density estimates; hence, allowing investigation of otherwise unnoticed phenomena, including: multi-modal and skewed behaviour. This study has found that operation of a common rail diesel engine with high ethanol substitutions (>20% at full load, >30% at three quarter load) results in a significant reduction in ignition delay. Further, this study also concluded that if the engine is operated with absolute air to fuel ratios (mole basis) less than 15, the inter-cycle variability is substantially increased compared to normal operation. (C) 2013 Elsevier Ltd. All rights reserved.
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