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Inter-cycle variability of in-cylinder pressure parameters in an ethanol fumigated common rail diesel engine

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  • Bodisco, Timothy
  • Brown, Richard J.

Abstract

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.

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  • Bodisco, Timothy & Brown, Richard J., 2013. "Inter-cycle variability of in-cylinder pressure parameters in an ethanol fumigated common rail diesel engine," Energy, Elsevier, vol. 52(C), pages 55-65.
    • Handle: RePEc:eee:energy:v:52:y:2013:i:c:p:55-65
    DOI: 10.1016/j.energy.2012.12.032
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    1. Zare, Ali & Bodisco, Timothy A. & Nabi, Md Nurun & Hossain, Farhad M. & Rahman, M.M. & Ristovski, Zoran D. & Brown, Richard J., 2017. "The influence of oxygenated fuels on transient and steady-state engine emissions," Energy, Elsevier, vol. 121(C), pages 841-853.
    2. Faisal Lodi & Ali Zare & Priyanka Arora & Svetlana Stevanovic & Mohammad Jafari & Zoran Ristovski & Richard J. Brown & Timothy Bodisco, 2020. "Combustion Analysis of a Diesel Engine during Warm up at Different Coolant and Lubricating Oil Temperatures," Energies, MDPI, vol. 13(15), pages 1-21, August.
    3. Mitchell, Brett J. & Zare, Ali & Bodisco, Timothy A. & Nabi, Md Nurun & Hossain, Farhad M. & Ristovski, Zoran D. & Brown, Richard J., 2017. "Engine blow-by with oxygenated fuels: A comparative study into cold and hot start operation," Energy, Elsevier, vol. 140(P1), pages 612-624.
    4. Zhou, J.H. & Cheung, C.S. & Zhao, W.Z. & Leung, C.W., 2016. "Diesel–hydrogen dual-fuel combustion and its impact on unregulated gaseous emissions and particulate emissions under different engine loads and engine speeds," Energy, Elsevier, vol. 94(C), pages 110-123.
    5. S. M. Ashrafur Rahman & Md. Nurun Nabi & Thuy Chu Van & Kabir Suara & Mohammad Jafari & Ashley Dowell & Md. Aminul Islam & Anthony J. Marchese & Jessica Tryner & Md. Farhad Hossain & Thomas J. Rainey , 2018. "Performance and Combustion Characteristics Analysis of Multi-Cylinder CI Engine Using Essential Oil Blends," Energies, MDPI, vol. 11(4), pages 1-15, March.
    6. Sarjovaara, Teemu & Alantie, Jussi & Larmi, Martti, 2013. "Ethanol dual-fuel combustion concept on heavy duty engine," Energy, Elsevier, vol. 63(C), pages 76-85.
    7. Bodisco, Timothy & Tröndle, Philipp & Brown, Richard J., 2015. "Inter-cycle variability of ignition delay in an ethanol fumigated common rail diesel engine," Energy, Elsevier, vol. 84(C), pages 186-195.

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