The Analysis of Energy Conversion Efficiency in SI Engines for Selected Gaseous Fuels

Flekiewicz, M.; Kubica, Grzegorz; Flekiewicz, B.

doi:10.4271/2014-01-2692

Cited by 2 publications

(3 citation statements)

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“…In SI engines is used in combination with LPG [7,8]. In the previous studies, carried out at the Faculty of Transport of Silesian University of Technology [2,3], the changes that occur in the combustion process, depending on the amount of DME's participation, were determined. These tests were conducted at idle and at full engine load for selected speeds.…”

Section: Introductionmentioning

confidence: 99%

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The possibilities of using DME (BioDME), as an additive to conventional gaseous fuels in SI engine

2017

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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.

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Section: Introductionmentioning

confidence: 99%

“…IMEP for engine fueled by LPG-DME mixtures, at 2500 rpm; WOT and λ = 1.0[2] ROHR as a function of DME ratio, at 2500 rpm; WOT and λ = 1.0[3] …”

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The possibilities of using DME (BioDME), as an additive to conventional gaseous fuels in SI engine

2017

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“…It was found that increased propane content also increased IMEP, while it decreased the COV of IMEP and duration of combustion [121]. Methane and hydrogen mixtures have also been tested for SI engine power characteristics [122].…”

Section: Chp Systemsmentioning

confidence: 99%

A Framework for Energy Optimization of Small, Two-Stroke, Natural Gas Engines for Combined Heat and Power Applications

Darzi¹

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A Framework for Energy Optimization of Small, Two-Stroke, Natural Gas Engines for Combined Heat and Power Applications Mahdi Darzi This research was focused on the development of a framework for the energy optimization a natural gas engine for small combined heat and power (CHP) applications operating with lowpressure natural gas (NG) available at homes. The required targets of the ARPA-E GENSETS program for 1 kW electric power generation and previous GENSETS simulation at West Virginia University, suggested a design space for the engine which is currently dominated by simple twostroke designs. Hence this research focused on screening, modeling, and experimentally evaluation of cost-effective technologies to achieve a system design that maximized thermal efficiency and utilization factor, while reducing emissions. A baseline engine was selected which started with 8% brake thermal efficiency (BTE) on natural gas operation. By implementing intake and exhaust optimization BTE increased up to around 12% and with head design optimization and exhaust backpressure, the engine reached 15% BTE. Though the initial optimization methods almost doubled efficiency, it was realized that further increases in BTE must be achieved for a commercially competitive design. The engine was redesigned to utilize modified porting for enhanced breathing and scavenging and a method to deploy low-pressure direct injection (LPDI) was developed. With these enhancements, BTE increased to around 24%. A second round of optimization was performed then, by modeling the whole system in a 1D platform and using a genetic algorithm and experimental data to further optimize scavenging which increased the efficiency up to around 26%. Finally, a 3D computational fluid dynamics (CFD) was developed to investigate the stratification effects of LPDI and determine the optimal spark plug location. This effort increased the BTE to around 27.5%. To assess issues with commercial deployment, three different NG compositions and propane operation were investigated. With an energy balance and exergy distribution analysis for each fuel, fuel quality effects on the CHP system performance were determined. At the end, with combination literature review, experiments, 1D and 3D simulations, a framework for optimization of micro-CHP systems operating on gaseous fuels was developed that can serve industry to highlight methods that can more than triple brake thermal efficiency of small two-stroke engines while improving the energy distribution for CHP systems. iii Acknowledgment Special thanks to Dr. Johnson for his support and mentorship throughout my PhD program. I thank my dedicated PhD committee members for their guidance and valuable feedback to improve this dissertation. I would like to thank Mr.

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The Analysis of Energy Conversion Efficiency in SI Engines for Selected Gaseous Fuels

Cited by 2 publications

References 10 publications

The possibilities of using DME (BioDME), as an additive to conventional gaseous fuels in SI engine

The possibilities of using DME (BioDME), as an additive to conventional gaseous fuels in SI engine

A Framework for Energy Optimization of Small, Two-Stroke, Natural Gas Engines for Combined Heat and Power Applications

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