Abstract
This paper presents results of investigation of co-combustion process of biodiesel with gasoline, in form of mixture and using dual fuel technology. The main objective of this work was to show differences in both combustion systems of the engine powered by fuels of different reactivity. This paper presents parameters of the engine and the assessment of combustion stability. It turns out that combustion process of biodiesel was characterized by lower ignition delay compared to diesel fuel combustion. For 0.54 of gasoline energetic fraction, the ignition delay increased by 25% compared to the combustion of the pure biodiesel, but for dual fuel technology for 0.95 of gasoline fraction it was decreased by 85%. For dual fuel technology with the increase in gasoline fraction, the specific fuel consumption (SFC) was decreased for all analyzed fractions of gasoline. In the case of blend combustion, the SFC was increased in comparison to dual fuel technology. An analysis of spread of ignition delay and combustion duration was also presented. The study confirmed that it is possible to co-combust biodiesel with gasoline in a relatively high energetic fraction. For the blend, the ignition delay was up to 0.54 and for dual fuel it was near to 0.95.
Highlights
In recent years, research works have focused on the reduction of harmful substances emitted by internal combustion engines
This paper presents the results of an experimental investigation into the co-combustion process of gasoline with biodiesel as a blend or using dual fuel technology
The tests were carried out on the same engine under comparable conditions. Both combustion systems were implemented in the same engine and the same test system was used for the tests
Summary
Research works have focused on the reduction of harmful substances emitted by internal combustion engines. Compression ignition engines are widely used in industry and transportation due to their higher fuel economy, durability and specific power output. Research works are aimed at creating a high performance engine with low exhaust gas emissions. It seems to be a good solution to use the compression ignition engine due to higher energy conversion efficiency, mainly due to a relatively high compression ratio, lean stratified charge and no throttling. There has been an increased interest in the use of unconventional fuels for compressing piston engines [4,5]. One way is to produce a blend of diesel fuel with other fuel and bring the mixture to the engine, using a typical supply system for a diesel engine (Figure 1a)
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