Experimental and kinetic study on ignition delay times of lean n -butane/hydrogen/argon mixtures at elevated pressures

Jiang, Xue; Pan, Youshun; Liu, Yang; Sun, Wuchuan; Huang, Zuohua

doi:10.1016/j.ijhydene.2017.03.196

Cited by 27 publications

(11 citation statements)

References 32 publications

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“…For a fundamental understanding of the oxidation of these species and for the development of reliable chemical kinetic models, a wide range of facilities and validation targets is required. The focus of the literature review in this study is primarily on the ignition delay time (IDT) measurements in a shock tube (ST) and in a rapid compression machine (RCM) and is limited to the species present in the LPG fuel composition of this study. − It can be seen that several of the species have been studied at different conditions of pressure, equivalence ratios, and temperature ranges. However, studies on different mixture compositions are limited to simple secondary and ternary mixtures with the exception of the work from Healy et al where quintenary natural gas mixtures were investigated (Figure ).…”

Section: Introductionmentioning

confidence: 99%

Understanding the Oxidation Behavior of Automotive Liquefied Petroleum Gas Fuels: Experimental and Kinetic Analyses

et al. 2020

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Liquefied petroleum gas (LPG) is a low-carbon fuel with an existing fuel supply infrastructure. As compared to petroleum-based gasoline, it features a higher octane rating. As compared to port fuel injection (PFI) systems, the direct injection (DI) of LPG engines reveals significant advantages in modern spark-ignition, such as higher efficiency. LPG primarily consists of C 3 and C 4 hydrocarbons, but the composition can drastically vary according to the current European LPG fuel standard EN 589. Several studies have focused already on understanding the oxidation process of its primary components. In this study, the focus will be on the autoignition behavior of different LPG compositions. Thereto, four different LPG fuels according to the current European LPG fuel standard EN 589 have been investigated. They cover a wide range of compositions and thus different autoignition behaviors. The fuels involve an LPG with a maximum propene/propane content, a typical winter-grade LPG with propane/n-butane/isobutane content, a high propane content, and high n-butane/isobutane content. These fuels also contain minor fragments of C 2 and other C 4 hydrocarbons. A rapid compression machine (RCM) has been used in this study to measure ignition delay times primarily in the low-to-intermediate temperature regime at stoichiometric conditions with a final compression pressure of 20 bar. Zero-dimensional simulations, including the facility effects of the RCM, have been performed with the help of detailed chemical kinetic mechanisms reported in the literature. The Aramco Mech 3.0 mechanism was chosen on the basis of its ability to represent the experimental data investigated in this study and additionally on the basis of the criteria that the major species in the mechanism are available and validated at application-relevant conditions. The mechanism is further used to understand the oxidation behavior of the fuel. Sensitivity analyses with the selected mechanism at application-relevant conditions were performed for the different LPG mixtures to reveal the most sensitive reactions, which affect the reactivity of the fuel. Similarly, to monitor the rate of production and consumption of species at experimental conditions of interest, flux analyses were performed at the point where 20% of the fuel is consumed. From the performed kinetic analyses, it is observed that the production of HO ̇2 radicals by the subchemistry of the primary fuel component is consumed by propene subchemistry, leading to more O ̇H radical production, which controls the global reactivity in the investigated regime.

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Section: Introductionmentioning

confidence: 99%

Understanding the Oxidation Behavior of Automotive Liquefied Petroleum Gas Fuels: Experimental and Kinetic Analyses

et al. 2020

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“…The flame kinetics and the high temperature ignition kinetics were also conducted. Jiang et al [15] measured the ignition delay times of the lean n-butane/hydrogen/ argon mixtures using a shock tube at elevated pressure and temperature. Bosschaart et al [16] reviewed the heat flux method for stabilizing the flat adiabatic flames and measuring the adiabatic burning velocities.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the cycle performance and the combustion characteristic of two CO2-based binary mixtures for the transcritical power cycle

Pan

et al. 2019

Energy

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It is difficult to condense subcritical CO 2 in the CO 2 transcritical power cycle by the conventional cooling, because of CO 2 's low critical temperature. With the aim to solve this problem, a new transcritical power cycle is proposed, using a CO 2-based binary mixture as working fluid. Two mixtures are considered, namely, n-butane/CO 2 and isobutane/CO 2. Because n-butane and isobutane are flammable, the flammability of the mixtures are worth of note as well as their cycle performance. A laminar flame combustion rate experimental platform is established to investigate the combustion characteristics of both mixtures under different mixing ratio. The results show that their critical temperature increases with increasing the organic fraction and their critical pressure shows a peak value in considered conditions. The critical temperature can reach 40 C with the organic fraction of 0.0711 for n-butane/CO 2 and 0.0806 for isobutane/CO 2. Under these mixing ratios, the transcritical power cycle can run by the conventional water cooling. The thermal efficiency reaches the highest value of 12.78% under the mole ratio of 0.28/ 0.72 for n-butane/CO 2. Isobutane/CO 2 gives the best condition under the mole ratio of 0.32/0.68, with the thermal efficiency reaching 12.97%. The flammable critical mole ratios for n-butane/CO 2 and isobutane/ CO 2 are 0.04/0.96 and 0.09/0.91, respectively.

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“…It is a normal method to improve ignition and combustion characteristics of n‐butane with blending other flammable fuels in references. For example, Zhong et al found that the catalytic ignition temperature of n‐butane blending with hydrogen was reduced, in addition, thermal and chemical effects of the hydrogen addition were analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Zhong et al found that the catalytic ignition temperature of n‐butane blending with hydrogen was reduced, in addition, thermal and chemical effects of the hydrogen addition were analyzed. Jiang et al indicated that the hydrogen blending has a nonlinearly promoting effect on the n‐butane ignition and the ignition delay time of n‐butane was reduced by 50% at a large extent. Iida et al regulated ignition and combustion characteristics of n‐butane in HCCI engines through adjusting the DME blending ratio.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on ignition intensification of n‐butane with tert‐butyl hydroperoxide (TBHP) addition

et al. 2019

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Summary Aimed to intensify the ignition and combustion process of n‐butane fuel in micro internal combustion (IC) engines, ignition delay characteristics of n‐butane/air mixtures with tert‐butyl hydroperoxide (TBHP) addition ratios below 10% were investigated numerically by CHEMKIN‐PRO software. Results show that ignition delay times of n‐butane can be shortened nonlinearly with TBHP addition at initial temperatures of 650 K to 1000 K, namely, the reduction rate of ignition delay times rises slowly as the TBHP addition ratio increases. In addition, the negative temperature coefficient (NTC) behavior can be weakened significantly with TBHP addition at 650 K to 1000 K. Especially, the ignition delay time of n‐butane can be reduced about 32 times with 10% TBHP addition at 750 K. However, the ignition intensification effect of TBHP addition is slight when the initial temperature is above 1000 K. The acting mechanism of TBHP addition was investigated in detail by the rate of production and consumption (ROP), sensitivity, and reaction pathway analysis. The ROP analysis shows that the released and quickly consumed OH radicals with TBHP addition play an important role in promoting n‐butane ignition at the lower initial temperature. However, the relatively slow consumption rate of OH radicals at higher temperature weakens the intensification effect. Furthermore, the sensitivity analysis and reaction pathway analysis indicate that the dominated elemental reactions and reaction pathway vary significantly with TBHP addition at lower initial temperature.

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Experimental and kinetic study on ignition delay times of lean n -butane/hydrogen/argon mixtures at elevated pressures

Cited by 27 publications

References 32 publications

Understanding the Oxidation Behavior of Automotive Liquefied Petroleum Gas Fuels: Experimental and Kinetic Analyses

Understanding the Oxidation Behavior of Automotive Liquefied Petroleum Gas Fuels: Experimental and Kinetic Analyses

Investigation on the cycle performance and the combustion characteristic of two CO2-based binary mixtures for the transcritical power cycle

Numerical investigation on ignition intensification of n‐butane with tert‐butyl hydroperoxide (TBHP) addition

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