Numerical and experimental study of gaseous fuel injection for CNG direct injection

Choi, Mingi; Lee, Sanghoon; Park, Sungwook

doi:10.1016/j.fuel.2014.10.018

Cited by 29 publications

(11 citation statements)

References 22 publications

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“…Further, the injection rate and corresponding amount of fuel injected during unit time are increased with higher injection pressure, which favors the mixing process and the speed of flame propagation, thus, resulting in increased pressure rise rates and steeper cylinder pressure curves. This, however, can be further confirmed by the simulations of Choi et al [31]. Additionally, it can be seen from the curves that the cylinder pressure before injections, especially near the end of compression stroke, increases with the retarding injection timing as a result of the higher exhaust temperature and subsequent raised exhaust energy as well as consequent higher boost pressure.…”

Section: Resultssupporting

confidence: 56%

Combustion process and emissions of a heavy-duty engine fueled with directly injected natural gas and pilot diesel

Qiang

Shao

2015

Applied Energy

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Section: Resultssupporting

confidence: 56%

Combustion process and emissions of a heavy-duty engine fueled with directly injected natural gas and pilot diesel

Qiang

Shao

2015

Applied Energy

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“…Multipoint injection suffers at high load, where uniform fuel distribution cannot be achieved. As a result, the direct-injection system (DI) is considered as the most recent sophisticated fuel-injection system [185]. A typical spark-ignition direct-injection (SIDI) engine consists of a high-pressure fuel pump, injector, and ECU, where the ECU controls the amount of fuel injection and injection parameters, such as injection pressure and injection time [186].…”

Section: Spark-ignition Direct-injection Enginesmentioning

confidence: 99%

Natural Gas Engine Technologies: Challenges and Energy Sustainability Issue

2018

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Energy sustainability and environmental issues pose greater challenges on different primary energy sectors as the global energy demand increases and it is projected to further increase with an upsurge in population. On the other hand, energy sources from conventional fossil-based fuels are depleting, forcing explorations in challenging and difficult locations. As a result, the use of alternative fuels received dramatic consideration to substitute these conventional fuels, of which natural gas took the significant share. However, the share of natural-gas vehicles in the current vehicle market is quite small, and it is estimated to be below 5%. This paper reviews the current resource scenarios including proven and potential reserves, current production, and consumption, along with the fueling infrastructure, distribution, and storage. It also provides summary of the development of fuel-injection technologies aimed to enhance the performance of gas engines. More attention was also given to natural-gas engines and their limitations. Parameters affecting the performance and combustion of compressed natural gas (CNG) in spark-ignition (SI) engines are thoroughly assessed, among which compression ratio and injection timing play major roles in the optimization of CNG-fueled engines. Furthermore, different technologies that help close the performance gap between conventional liquid-fuel and natural-gas engines and future directions of the research are presented.

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“…Studies on supplying dual-fuel engines with natural gas relate mostly to mixer-based systems [6,7] as well as indirect [5,8,9] and direct injection systems [1,10,11]. However, they do not focus strictly on the widely used gas injected engines.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The gas can also be produced in the process of organic matter decomposition and transported in a liquid or gaseous state. Considering consumption, CNG is the third largest energy source material in the world [1] and is successfully used to power the engines in both mono-and bi-fuel configurations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Dual-Fuel Combustion Engine Fueled with Diesel Fuel and CNG in Transient Operating Conditions

Pielecha

Wisłocki

Cieślik

et al. 2016

SAE Technical Paper Series

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The paper presents the thermodynamic analysis of the engine supplied with small and large diesel fuel doses while increasing natural gas quantity. The paper presents changes in the combustion process thermodynamic indexes and changes in the exhaust gas emissions for dynamically increased share of the gaseous fuel. The cylinder pressure history was subject to thermodynamic analysis,. based on which the mean indicated pressure, the heat release rate, the quantity of heat released as well as the pressure rate increase after self-ignition were determined. These parameters were also referred to the subsequent engine operation cycles by specifying the scope of the change per cycle. The relationship between the engine load and the start, the center and the end of combustion while increasing the gas amount supplied to the cylinder was indicated. The presented analysis of the results indicates significant impact of the changes in the supplied gas amount on the engine operating indexes and exhaust emissions. The conducted tests made it possible to confirm that significant cooling of the cylinder (determined by the constant temperature of exhaust gas) does not allow combustion of a dual-fuel mixture during dynamic change of the engine fueling. It was shown that there is a relation between the thermal history of the cylinder (steady state conditions), the engine fueling rate and the possibility of combustion of a diesel-methane mixture.

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Numerical and experimental study of gaseous fuel injection for CNG direct injection

Cited by 29 publications

References 22 publications

Combustion process and emissions of a heavy-duty engine fueled with directly injected natural gas and pilot diesel

Combustion process and emissions of a heavy-duty engine fueled with directly injected natural gas and pilot diesel

Natural Gas Engine Technologies: Challenges and Energy Sustainability Issue

Analysis of a Dual-Fuel Combustion Engine Fueled with Diesel Fuel and CNG in Transient Operating Conditions

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