Reactivity controlled compression ignition (RCCI) combustion using methanol and diesel in a single cylinder research engine

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master_Dong_Yabin_2018.pdf (5.27 MB)

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Insinööritieteiden korkeakoulu | Master's thesis
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Date

2018-09-24

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Mcode

ENG215

Degree programme

Nordic Master Programme in Innovative and Sustainable Energy Engineering (ISEE)

Language

en

Pages

59+7

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Abstract

Conventional internal combustion engines have severe CO2, NOx and particulate matter (PM) emission problems so that the majority of countries in the world have issued regulations to control the emission. Alternative fuels such as natural gas, methane and ethanol are studied to tackle the problem. Methanol also has the potential to reduce CO2, NOx and PM emissions due to lower C/H ratio, local oxygen and high evaporation latent heat. Therefore, methanol, as a fuel, applied with advanced combustion technology provides possibilities to solve emission problems. RCCI technology is discovered as an advanced engine technology to reduce NOx emissions as well as fossil fuel utilisation in the future. In the thesis, methanol and diesel are chosen to conduct the RCCI combustion. To reach the RCCI combustion mode, the diesel injection strategy is firstly tested, and the experiment is divided into two groups based on the diesel injection strategy: split diesel injection and single diesel injection. Within each group, methanol injection timing, methanol substitution rate (MSR), air mass flow and air intake temperature are the main parameters. The results demonstrate the diesel injection strategy has a direct influence on the combustion characters. RCCI combustion mode can be reached in single and early diesel injection conditions, while the feature of combustion in split diesel injection condition is dominant by the pilot diesel fuel showing dual fuel or diesel combustion characters. Single diesel injection also reduces the NOx emissions. In both experiment groups, air intake temperature significantly active the fuel. Besides, in the single diesel injection group, each particular MSR has a precise and narrow diesel injection operation window.

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Supervisor

Larmi, Martti

Thesis advisor

Kaario, Ossi

Keywords

methanol, RCCI, reactivity stratification, injection strategy

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https://urn.fi/URN:NBN:fi:aalto-201810055282

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