Hot Surface Assisted Compression Ignition of Natural Gas in a Direct Injection Diesel Engine

Æsøy, Vilmar; Valland, Harald

doi:10.4271/960767

Cited by 29 publications

(20 citation statements)

References 4 publications

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“…7). This confirms the results obtained by other authors in terms of effect of the addition of methane into the air on the process of ignition delay in a dual fuel engine (Aesoy and Valland, 1996).…”

Section: Comparative Analysis Of Combustion Performance In a Dual-fuesupporting

confidence: 92%

Numerical Studies on Controlling Gaseous Fuel Combustion by Managing the Combustion Process of Diesel Pilot Dose in a Dual-Fuel Engine

Mikulski¹,

Wierzbicki²,

Piętak³

2015

Chemical and Process Engineering

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Protection of the environment and counteracting global warming require finding alternative sources of energy. One of the methods of generating energy from environmentally friendly sources is increasing the share of gaseous fuels in the total energy balance. The use of these fuels in compression-ignition (CI) engines is difficult due to their relatively high autoignition temperature. One solution for using these fuels in CI engines is operating in a dualfuel mode, where the air and gas mixture is ignited with a liquid fuel dose. In this method, a series of relatively complex chemical processes occur in the engine's combustion chamber, related to the combustion of individual fuel fractions that interact with one another. Analysis of combustion of specific fuels in this type of fuel injection to the engine is difficult due to the fact that combustion of both fuel fractions takes place simultaneously. Simulation experiments can be used to analyse the impact of diesel fuel combustion on gaseous fuel combustion. In this paper, we discuss the results of simulation tests of combustion, based on the proprietary multiphase model of a dual-fuel engine. The results obtained from the simulation allow for analysis of the combustion process of individual fuels separately, which expands the knowledge obtained from experimental tests on the engine.

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Section: Comparative Analysis Of Combustion Performance In a Dual-fuesupporting

confidence: 92%

Numerical Studies on Controlling Gaseous Fuel Combustion by Managing the Combustion Process of Diesel Pilot Dose in a Dual-Fuel Engine

Mikulski¹,

Wierzbicki²,

Piętak³

2015

Chemical and Process Engineering

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“…The study (Aesoy, Valland 1996) has confirmed the hypothesis that the total ignition delay depends on the composition of a gas-air mixture. For mixtures of NG with air, the authors achieved a nearly twice-smaller ignition delay angle than when pure methane was used to make a mixture.…”

Section: Introductionsupporting

confidence: 80%

Effect of CNG in a Fuel Dose on the Combustion Process of a Compression-Ignition Engine

et al. 2015

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Currently, one of the major trends in the research of contemporary combustion engines involves the potential use of alternative fuels. Considerable attention has been devoted to methane, which is the main component of Natural Gas (NG) and can also be obtained by purification of biogas. In compression-ignition engines fired with methane or Compressed Natural Gas (CNG), it is necessary to apply a dual-fuel feeding system. This paper presents the effect of the proportion of CNG in a fuel dose on the process of combustion. The recorded time series of pressure in a combustion chamber was used to determine the repeatability of the combustion process and the change of fuel compression-ignition delay in the combustion chamber. It has been showed that NG does not burn completely in a dual-fuel engine. The best conditions for combustion are ensured with higher concentrations of gaseous fuel. NG ignition does not take place simultaneously with diesel oil ignition. Moreover, if a divided dose of diesel is injected, NG ignition probably takes place at two points, as diesel oil.

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“…The ignition characteristics of injected natural gas achievable using a GP have been investigated in different laboratories. Aesoy and Valland 2,6 conducted experiments in a constant-volume combustion chamber and found that methane can be ignited within 2 ms only when the GP surface temperature is above 1200 K. Similar conclusions were obtained by Willi and Richards. 7 Aesoy and Valland 2,6 also found that the natural gas composition, GP surface area and fuel injection pressure have influences on ignition delay.…”

Section: Introductionsupporting

confidence: 68%

“…Aesoy and Valland 2,6 conducted experiments in a constant-volume combustion chamber and found that methane can be ignited within 2 ms only when the GP surface temperature is above 1200 K. Similar conclusions were obtained by Willi and Richards. 7 Aesoy and Valland 2,6 also found that the natural gas composition, GP surface area and fuel injection pressure have influences on ignition delay. The Engine Research and Development Laboratory (ERDL) also carried out a series of experimental studies in an optically accessible constant-volume combustion chamber coupled to a co-operative fuel research (CFR) engine.…”

Section: Introductionsupporting

confidence: 68%

Numerical studies of the ignition characteristics of a high-pressure gas jet in compression-ignition engines with glow plug ignition assist: Part 1—Operating condition study

Pan

Wallace

2017

International Journal of Engine Research

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This article presents the results of computational studies investigating the ignition of high-pressure natural gas jets in a compression-ignition engine with glow plug ignition assist. The simulation was conducted using a KIVA-3V-based three-dimensional engine model, along with an improved fuel injector model, a detailed cut-off glow plug shield model and a modified two-step methane reaction mechanism, to simulate the natural gas injection and ignition. The simulated results demonstrate the significance of using a shield for the glow plug. Compared to an unshielded (bare) glow plug, the shield not only reduces the heat loss from the hot glow plug surface to the cold intake air charge and the cold injected gas jet but also traps the fuel mixture to increase its residence time adjacent to the hot surface. Over a representative range of heavy-duty diesel engine operating conditions, a shielded glow plug greatly improves the natural gas engine performance and provides reliable ignition, while an unshielded glow plug can only be optimized for specific conditions. The understanding of glow plug shield behavior gained from the simulations suggests avenues for improved shield designs that would yield further reduced ignition delays.

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Hot Surface Assisted Compression Ignition of Natural Gas in a Direct Injection Diesel Engine

Cited by 29 publications

References 4 publications

Numerical Studies on Controlling Gaseous Fuel Combustion by Managing the Combustion Process of Diesel Pilot Dose in a Dual-Fuel Engine

Numerical Studies on Controlling Gaseous Fuel Combustion by Managing the Combustion Process of Diesel Pilot Dose in a Dual-Fuel Engine

Effect of CNG in a Fuel Dose on the Combustion Process of a Compression-Ignition Engine

Numerical studies of the ignition characteristics of a high-pressure gas jet in compression-ignition engines with glow plug ignition assist: Part 1—Operating condition study

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