Abstract
The aim of the work is a comparison of two combustion systems of fuels with different reactivity. The first is combustion of the fuel mixture and the second is combustion in a dual-fuel engine. Diesel fuel was burned with pure ethanol. Both methods of co-firing fuels have both advantages and disadvantages. Attention was paid to the combustion stability aspect determined by COVIMEP as well as the probability density function of IMEP. It was analyzed also the spread of the maximum pressure value, the angle of the position of maximum pressure. The influence of ethanol on ignition delay time spread and end of combustion process was evaluated. The experimental investigation was conducted on 1-cylinder air cooled compression ignition engine. The test engine operated with constant rpm equal to 1500 rpm and constant angle of start of diesel fuel injection. The engine was operated with ethanol up to 50% of its energy fraction.
Highlights
Compression ignition engines are considered a significant source harmful emission that contributes to the increase in the greenhouse effect [1,2]
The second method is a dual fuel engine power system in which fuels are delivered to the engine separately
In most commonly used power systems, fossil fuel for compression ignition engine is delivered by a direct injection system and alternative fuel is injected into the intake port [6]
Summary
Compression ignition engines are considered a significant source harmful emission that contributes to the increase in the greenhouse effect [1,2]. Most alternative fuels have trouble creating a stable mixture. This disadvantage strongly limits the share of alternative fuel in the mixture In such a power system, it is difficult to change the ratio of diesel/other fuel [5]. In most commonly used power systems, fossil fuel for compression ignition engine is delivered by a direct injection system and alternative fuel is injected into the intake port [6]. The ignition process is controlled by the injected dose of diesel fuel. This requires the addition of an injector, along with a separate fuel tank, lines and control system. Various alcohols are often used as alternative fuels, such as ethanol, methanol, butanol or propanol. Recent years have seen intensifying explorations of Processes 2019, 7, 946; doi:10.3390/pr7120946 www.mdpi.com/journal/processes
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