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Effects of mixture formation strategies on combustion in dual-fuel engines - a review

Pielecha Ireneusz, Sidorowicz Maciej

Combustion Engines

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2021

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R. 60, nr 1

30--40

EN

The article presents an overview of technical solutions for dual fuel systems used in internal combustion engines. It covers the historical and contemporary genesis of using two fuels simultaneously in the combustion process. The authors pay attention to the value of the excess air coefficient in the cylinder, as the ignitability of the fuel dose near the spark plug is a critical factor. The mixture formation of compression ignition based systems are also analyzed. The results of research on indirect and direct injection systems (and their combinations) have been presented. Research sections were separated based to the use of gasoline with other fuels or diesel oil with other fuels. It was found that the use of two fuels in different configurations of the fuel supply systems extends the conditions for the use of modern combustion systems (jet controlled compression ignition, reactivity controlled compression ignition, intelligent charge compression ignition, premixed charge compression ignition), which will enable further improvement of combustion efficiency.

2

Analysis of the effect of the chemical composition of low calorific gaseous fuels on workload concentration in an engine’s combustion chamber

Wierzbicki S.

Journal of Polish CIMAC

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2013

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Vol. 8, no 1

89--96

EN

Low calorific gaseous fuels are becoming increasingly used as alternative fuels for feeding power equipment of all kinds, including combustion engines. The increased interest in these fuels results, above all, from support for the development of this type of power engineering by governmental and international institutions, aiming to increase the renewable energy share in the overall energy balance. Fuels of this type are obtained by processing different kinds of biomass and natural raw materials and can also be recovered from natural processes occurring in nature. Due to the diverse technologies for obtaining these fuels, their chemical composition is variable, which significantly affects the efficiency of their use as fuels for combustion engines. When engines are fed with gaseous fuels, combustion chamber filling conditions change considerably due to the much higher gaseous fuel volume compared to liquid fuels, which significantly affects the engine’s performance. This paper presents the effect of individual combustible components contained in different low calorific gaseous fuels on changes in the degree of engine combustion chamber air filling and on the calorific value of the produced combustible air-gaseous fuel mixture.

3

Wpływ składu mieszanki na emisję szkodliwych składników spalin podczas zasilania silnika gazem ziemnym

Worsztynowicz B.

Czasopismo Techniczne. Mechanika

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2012

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R. 109, z. 4-M

35--43

PL

W artykule poruszono temat emisji szkodliwych składników spalin do atmosfery w wyniku spalania gazu ziemnego w silnikach spalinowych przy zastosowaniu różnego składu mieszanki palnej. Przedstawione zostały wyniki pomiarów wykonanych na stanowisku hamowni silnikowej w warunkach sporządzania charakterystyk obciążeniowych dla silnika o zapłonie iskrowym. Na podstawie pomiarów przeprowadzono analizę wpływu składu mieszanki palnej na zawartość szkodliwych składników w spalinach, a także na skuteczność działania reaktora katalitycznego.

EN

The article addresses the topic of harmful substances emissions into the atmosphere as the result of the natural gas combustion in the combustion engines, when using various composition of combustible mixture. The paper presents the results of measurements conducted on the engine test stand in terms of prepared load characteristics for a spark ignition engine. On the basis of these measurements the article provides the analysis of the impact of combustible mixture on harmful substances content in the exhaust gases and conversion efficiency of a catalytic converter.