Abstract
The results of SI engine fueled with blends of LPG and DME are presented in the paper. The range studies submitted includes measurements at varying engine loads, at selected values of speed. The research was conducted on a chassis dynamometer, specifying the engine load by the degree of throttle opening. Value of the mass fraction of DME in the blend with LPG was determined based on previous analyzes. The selected fuel blends containing from 7 to 17% DME (mass fraction). During the study was also performed a series of comparative measurements with pure LPG. Analyses show that of DME can be used as a partial substitute for LPG in SI engines. Its presence does not a negative impact on performance and emissions of the engine. The obtained results indicate that the amount of addition of DME should be varied depending on the engine load. Moreover, the use of this fuel does not require changes to the design fueling system and storage of LPG.
Highlights
The use of DME as fuel in SI engines is becoming more frequently considered
The results showed that a limited DME additive, in the range of approximately 7–15% by weight, increased engine performance
The scope of the tests included determining the external characteristics of the engine, its maximum power and torque depending on the load
Summary
The use of DME as fuel in SI engines is becoming more frequently considered. Economic and ecological benefits combined with very favorable physicochemical properties are the direct cause of these interests [5, 6]. The most important aspect to mention is the possibility of obtaining. DME as a renewable fuel produced from biomass. There is the possibility of significant reduction of CO2 emissions, compared with LPG, 30–80% [1] and NOx reduction: 5–15% [1], in the total balance. Similar LPG properties allow to use the infrastructure and fueling systems commonly used for LPG. Among the methods of obtaining DME on an industrial scale, the most effective are gas-based technologies
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