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Kaoru Maruta - One of the best experts on this subject based on the ideXlab platform.

  • study on Cetane Number dependence of diesel surrogates air weak flames in a micro flow reactor with a controlled temperature profile
    Proceedings of the Combustion Institute, 2013
    Co-Authors: Satoshi Suzuki, Mikito Hori, Hisashi Nakamura, Takuya Tezuka, Susumu Hasegawa, Kaoru Maruta
    Abstract:

    Abstract Ignition and combustion characteristics of a stoichiometric gaseous diesel surrogates/air mixtures were investigated using a micro flow reactor with a controlled temperature profile. Five diesel surrogates ( n -Cetane, n -decane, n -heptane, iso-Cetane, and α-methylnaphthalene), which have low vapor pressures, were applied as fuels to the micro flow reactor. Three kinds of flames were observed by changing the mixture flow velocity at the inlet of the reactor. At the low velocity region, multi-stage oxidation process of the fuel (weak flames) can be observed as separated multiple stationary flames. A cool flame was observed as first-stage oxidation in the weak flames around 780 K, when applying large n -alkanes as fuel. Focusing on this flow velocity condition, weak flame responses to Cetane Number variations were examined at atmospheric pressure. The Cetane Number was varied by two ways; changing mixing ratio of n -Cetane and iso-Cetane (diesel PRF); or using pure fuels with different Cetane Numbers. Trends of the observed weak flames at different Cetane Number in both cases showed that luminosity from the first oxidation (cool flame) became weaker, and the first and third reactions shift to high temperature region with the decrease of the Cetane Number. The capability of the present reactor for examination of the general ignition and characteristics of various low-vapor-pressure fuels was demonstrated. Gas sampling and analysis were conducted for n -Cetane and iso-Cetane. According to CH 2 O concentration profile, it was confirmed that the flame structure of n -Cetane weak flame was similar to that of n -heptane. The predictions of 1D steady simulations with detailed reaction kinetics agreed with the trends of the multi-stage oxidation processes and the CH 2 O profiles except the iso-Cetane case. Measured profile of iso-Cetane showed that CH 2 O started increasing in the temperature much higher than the prediction and that the employed chemical model for iso-Cetane overestimated the low temperature reaction.

  • Study on Cetane Number dependence of diesel surrogates/air weak flames in a micro flow reactor with a controlled temperature profile
    Proceedings of the Combustion Institute, 2012
    Co-Authors: Satoshi Suzuki, Mikito Hori, Hisashi Nakamura, Takuya Tezuka, Susumu Hasegawa, Kaoru Maruta
    Abstract:

    Abstract Ignition and combustion characteristics of a stoichiometric gaseous diesel surrogates/air mixtures were investigated using a micro flow reactor with a controlled temperature profile. Five diesel surrogates ( n -Cetane, n -decane, n -heptane, iso-Cetane, and α-methylnaphthalene), which have low vapor pressures, were applied as fuels to the micro flow reactor. Three kinds of flames were observed by changing the mixture flow velocity at the inlet of the reactor. At the low velocity region, multi-stage oxidation process of the fuel (weak flames) can be observed as separated multiple stationary flames. A cool flame was observed as first-stage oxidation in the weak flames around 780 K, when applying large n -alkanes as fuel. Focusing on this flow velocity condition, weak flame responses to Cetane Number variations were examined at atmospheric pressure. The Cetane Number was varied by two ways; changing mixing ratio of n -Cetane and iso-Cetane (diesel PRF); or using pure fuels with different Cetane Numbers. Trends of the observed weak flames at different Cetane Number in both cases showed that luminosity from the first oxidation (cool flame) became weaker, and the first and third reactions shift to high temperature region with the decrease of the Cetane Number. The capability of the present reactor for examination of the general ignition and characteristics of various low-vapor-pressure fuels was demonstrated. Gas sampling and analysis were conducted for n -Cetane and iso-Cetane. According to CH 2 O concentration profile, it was confirmed that the flame structure of n -Cetane weak flame was similar to that of n -heptane. The predictions of 1D steady simulations with detailed reaction kinetics agreed with the trends of the multi-stage oxidation processes and the CH 2 O profiles except the iso-Cetane case. Measured profile of iso-Cetane showed that CH 2 O started increasing in the temperature much higher than the prediction and that the employed chemical model for iso-Cetane overestimated the low temperature reaction.

Huang Zhen - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Cetane Number Improver on Heat Release Rate and Emissions of High Speed Diesel Engine Fueled with Ethanol-Diesel Blend Fuel
    Journal of Combustion Science and Technology, 2020
    Co-Authors: Huang Zhen
    Abstract:

    The influence of Cetane Number improver on heat release rate and emissions of a high-speed diesel engine fueled with ethanol-diesel blend fuel was investigated.Different percentages of Cetane Number enhancer(0~0_0,0.2~0_0,0.4~0_0) were added to blends,and the engine tests were performed on a high speed diesel engine.The results show that the engine power decreases slightly; the thermal efficiency improves remarkably,and the NO_x and smoke emissions decrease simultaneously when diesel engine is fueled with blends.Besides, the engine power can be recovered,NO_x and smoke emissions are further reduced when Cetane Number improver is added to blends.By the combustion analysis,it can be found that the ignition delay prolongs;the total combustion duration shortens,and the maximum heat release rate increases for ethanol-diesel blend fuel when compared to diesel fuel; in addition,the combustion characteristics of ethanol-diesel blend fuel at large load may be recovered to diesel fuel by Cetane Number improver. However a large difference still exists at lower load.

  • effect of Cetane Number improver on heat release rate and emissions of high speed diesel engine fueled with ethanol diesel blend fuel
    Fuel, 2004
    Co-Authors: Lu Xingcai, Yang Jianguang, Zhang Wugao, Huang Zhen
    Abstract:

    Abstract This article investigates the influence of Cetane Number improver on heat release rate and emissions of a high-speed diesel engine fueled with ethanol–diesel blend fuel. Different percentages of Cetane Number enhancer (0, 0.2, 0.4%) were added to blends, and the engine tests were performed on a 4-cylinder high-speed DI diesel engine. The results show that: the brake specific fuel consumption (BSFC) increased, the diesel equivalent BSFC decreased, the thermal efficiency improved remarkably, and NOx and smoke emissions decreased simultaneously when diesel engine fueled with ethanol–diesel blend fuels; NOx and smoke emissions further reduced when CN improver was added to blends. From the combustion analysis, it can be found that the ignition delay prolonged, and the total combustion duration shortened for ethanol–diesel blend fuels when compared to diesel fuel; the combustion characteristics of ethanol–diesel blend fuel at large load may be resumed to diesel fuel by CN improver, but a large difference exists at lower load yet.

Henry J Curran - One of the best experts on this subject based on the ideXlab platform.

  • detailed chemical kinetic reaction mechanisms for primary reference fuels for diesel Cetane Number and spark ignition octane Number
    Proceedings of the Combustion Institute, 2011
    Co-Authors: C K Westbrook, W J Pitz, Marco Mehl, Henry J Curran
    Abstract:

    A detailed chemical kinetic reaction mechanism is developed for primary reference fuel mixtures of n-hexadecane and 2,2,4,4,6,8,8-heptamethyl nonane for diesel Cetane ratings. The mechanisms are constructed using existing rules for reaction pathways and rate expressions developed previously for the primary reference fuels for gasoline octane ratings, n-heptane and iso-octane. These reaction mechanisms are validated by comparisons between computed and experimental results for shock tube ignition and for oxidation under jet-stirred reactor conditions. The combined kinetic reaction mechanism contains the submechanisms for the primary reference fuels for diesel Cetane ratings and submechanisms for the primary reference fuels for gasoline octane ratings, all in one integrated large kinetic reaction mechanism. Representative applications of this mechanism to several test problems are presented, describing fuel/air autoignition variations with changes in fuel Cetane and octane Numbers, and others describing fuel combustion in a jet-stirred reactor environment with the fuel varying from pure 2,2,4,4,6,8,8-heptamethyl nonane (Cetane Number of 15) to pure n-hexadecane (Cetane Number of 100).

Satoshi Suzuki - One of the best experts on this subject based on the ideXlab platform.

  • study on Cetane Number dependence of diesel surrogates air weak flames in a micro flow reactor with a controlled temperature profile
    Proceedings of the Combustion Institute, 2013
    Co-Authors: Satoshi Suzuki, Mikito Hori, Hisashi Nakamura, Takuya Tezuka, Susumu Hasegawa, Kaoru Maruta
    Abstract:

    Abstract Ignition and combustion characteristics of a stoichiometric gaseous diesel surrogates/air mixtures were investigated using a micro flow reactor with a controlled temperature profile. Five diesel surrogates ( n -Cetane, n -decane, n -heptane, iso-Cetane, and α-methylnaphthalene), which have low vapor pressures, were applied as fuels to the micro flow reactor. Three kinds of flames were observed by changing the mixture flow velocity at the inlet of the reactor. At the low velocity region, multi-stage oxidation process of the fuel (weak flames) can be observed as separated multiple stationary flames. A cool flame was observed as first-stage oxidation in the weak flames around 780 K, when applying large n -alkanes as fuel. Focusing on this flow velocity condition, weak flame responses to Cetane Number variations were examined at atmospheric pressure. The Cetane Number was varied by two ways; changing mixing ratio of n -Cetane and iso-Cetane (diesel PRF); or using pure fuels with different Cetane Numbers. Trends of the observed weak flames at different Cetane Number in both cases showed that luminosity from the first oxidation (cool flame) became weaker, and the first and third reactions shift to high temperature region with the decrease of the Cetane Number. The capability of the present reactor for examination of the general ignition and characteristics of various low-vapor-pressure fuels was demonstrated. Gas sampling and analysis were conducted for n -Cetane and iso-Cetane. According to CH 2 O concentration profile, it was confirmed that the flame structure of n -Cetane weak flame was similar to that of n -heptane. The predictions of 1D steady simulations with detailed reaction kinetics agreed with the trends of the multi-stage oxidation processes and the CH 2 O profiles except the iso-Cetane case. Measured profile of iso-Cetane showed that CH 2 O started increasing in the temperature much higher than the prediction and that the employed chemical model for iso-Cetane overestimated the low temperature reaction.

  • Study on Cetane Number dependence of diesel surrogates/air weak flames in a micro flow reactor with a controlled temperature profile
    Proceedings of the Combustion Institute, 2012
    Co-Authors: Satoshi Suzuki, Mikito Hori, Hisashi Nakamura, Takuya Tezuka, Susumu Hasegawa, Kaoru Maruta
    Abstract:

    Abstract Ignition and combustion characteristics of a stoichiometric gaseous diesel surrogates/air mixtures were investigated using a micro flow reactor with a controlled temperature profile. Five diesel surrogates ( n -Cetane, n -decane, n -heptane, iso-Cetane, and α-methylnaphthalene), which have low vapor pressures, were applied as fuels to the micro flow reactor. Three kinds of flames were observed by changing the mixture flow velocity at the inlet of the reactor. At the low velocity region, multi-stage oxidation process of the fuel (weak flames) can be observed as separated multiple stationary flames. A cool flame was observed as first-stage oxidation in the weak flames around 780 K, when applying large n -alkanes as fuel. Focusing on this flow velocity condition, weak flame responses to Cetane Number variations were examined at atmospheric pressure. The Cetane Number was varied by two ways; changing mixing ratio of n -Cetane and iso-Cetane (diesel PRF); or using pure fuels with different Cetane Numbers. Trends of the observed weak flames at different Cetane Number in both cases showed that luminosity from the first oxidation (cool flame) became weaker, and the first and third reactions shift to high temperature region with the decrease of the Cetane Number. The capability of the present reactor for examination of the general ignition and characteristics of various low-vapor-pressure fuels was demonstrated. Gas sampling and analysis were conducted for n -Cetane and iso-Cetane. According to CH 2 O concentration profile, it was confirmed that the flame structure of n -Cetane weak flame was similar to that of n -heptane. The predictions of 1D steady simulations with detailed reaction kinetics agreed with the trends of the multi-stage oxidation processes and the CH 2 O profiles except the iso-Cetane case. Measured profile of iso-Cetane showed that CH 2 O started increasing in the temperature much higher than the prediction and that the employed chemical model for iso-Cetane overestimated the low temperature reaction.

Lu Xingcai - One of the best experts on this subject based on the ideXlab platform.

  • effect of Cetane Number improver on heat release rate and emissions of high speed diesel engine fueled with ethanol diesel blend fuel
    Fuel, 2004
    Co-Authors: Lu Xingcai, Yang Jianguang, Zhang Wugao, Huang Zhen
    Abstract:

    Abstract This article investigates the influence of Cetane Number improver on heat release rate and emissions of a high-speed diesel engine fueled with ethanol–diesel blend fuel. Different percentages of Cetane Number enhancer (0, 0.2, 0.4%) were added to blends, and the engine tests were performed on a 4-cylinder high-speed DI diesel engine. The results show that: the brake specific fuel consumption (BSFC) increased, the diesel equivalent BSFC decreased, the thermal efficiency improved remarkably, and NOx and smoke emissions decreased simultaneously when diesel engine fueled with ethanol–diesel blend fuels; NOx and smoke emissions further reduced when CN improver was added to blends. From the combustion analysis, it can be found that the ignition delay prolonged, and the total combustion duration shortened for ethanol–diesel blend fuels when compared to diesel fuel; the combustion characteristics of ethanol–diesel blend fuel at large load may be resumed to diesel fuel by CN improver, but a large difference exists at lower load yet.