Panorama of Natural Gas Usage in Heavy Duty Vehicles in Brazil

Machado, Guilherme Bastos; Melo, Tadeu Cavalcante Cordeiro de; Lastres, Luiz Fernando Martins

doi:10.4271/2005-01-2192

Cited by 1 publication

(1 citation statement)

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“…The literature review section will show that experimental investigations on NG composition effects is not a new topic. However, there is not enough information on the combustion characteristics of IC engines modified for NG operation without using advanced or specialized hardware [11][12][13][14]. More, there is a limited amount of information on the combustion characteristics of conventional heavy-duty (HD) diesel engines converted to NG SI operation.…”

Section: Objectivementioning

confidence: 99%

Fuel Composition Effects in a CI Engine Converted to SI Natural Gas Operation

Bommisetty¹,

Liu²,

Kooragayala³

et al. 2018

SAE Technical Paper Series

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Gas Composition Effects in a CI Engine Converted to SI Natural Gas Operation Hemanth Kumar BommisettyLow-carbon fuels such as natural gas (NG) have the potential to lower the demand of petroleum-based fuels, reduce engine-out emissions, and increase IC engine thermal efficiency.One of the most rapid and efficient use of NG in the transportation sector would be as a direct replacement of the diesel fuel in compression ignition (CI) engines without any major engine modifications to the combustion chamber such as new pistons and/or engine head. An issue is the large variation in NG composition with the location and age of the gas well across U.S., which would affect engine operation, as well as the technology integration with emissions after treatment systems. This thesis describes the use a conventional CI engine modified for spark ignition (SI) NG operation to investigate the effects of methane and a C1-C4 alkane blend on main combustion parameters like in-cylinder pressure, apparent heat release rate, IMEP, etc.Steady-state engine experiments were conducted at several operating conditions that changed spark timing, engine speed, and equivalence ratio. The study found that C1-C4 alkane blend operation increased peak pressure, IMEP, and indicated thermal efficiency compared to methane, for all the operating conditions investigated in this work. This suggests caution when translating methane-based experimental observations to real world NG operation, even for NG with high methane percentage as the one used in this work. As many NG studies in the literature used methane as an NG surrogate, a better understanding of real fuel effects in diesel-like combustion environments could be important for the successful conversion of conventional diesel engines to NG operation.iii Dedication This thesis is dedicated to my family and my friends iv AcknowledgementsFirstly, I would like to thank my family, especially to my mother -Uma Maheswari, sister -Nikitha Bommisetty and my grandfather -Eswaraiah, for all the support (morally and financially) they provided me, which drove me all the way till here. Their love and sacrifices are the main reasons which made it possible to continue my higher studies abroad, for which I'm very grateful to them.

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Section: Objectivementioning

confidence: 99%