A study on the low-to-intermediate temperature ignition delays of long chain branched paraffin: Iso-cetane

Yu, Liang; Qiu, Yue; Mao, Yebing; Wang, Sixu; Ruan, Can; Tao, Wei; Lü, Xingcai

doi:10.1016/j.proci.2018.08.039

Cited by 36 publications

(9 citation statements)

References 16 publications

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“…As for the pure HMN mechanism, Oehlschlaeger et al 24 developed a detailed kinetic mechanism based on the structural similarity with iso-octane and found that the mechanism prediction was in good agreement with the measured high-temperature ST data. Later, Yu et al 25 found this mechanism exhibits significant discrepancies in predicting low-temperature autoignition of HMN measured in an RCM. Recently, both the CRECK and LLNL groups have updated their previously published HMN mechanism, respectively.…”

Section: Hmn Submechanismmentioning

confidence: 99%

“…The second-stage ignition depends on the temperature, pressure, and concentration of radical pool after the first-stage ignition. 25 Thus, the initial reactivity of the simulated second-stage ignition is relatively low, thus resulting in a longer simulated second-stage ignition delay. Based on the above analyses, it is essential to optimize the low-temperature chain branching reaction of the HMN submechanism.…”

Section: Kinetic Analysismentioning

confidence: 99%

“…Surprisingly, the most OH-producing reaction is HMNOOH = HMNO + OH (the contribution of different isomers to total OH ROP was lumped as a whole, denoted as HMNOOH), which is one of the important reactions causing the NTC behavior. Yu et al 25 reported the "early and weak" was observed to proceed in the reverse direction, which inhibits the reactivity. Furthermore, it is found that the reaction class HMN + NH 2 exhibits a promoting effect on ignition under low-temperature and intermediate-temperature conditions.…”

Section: Kinetic Analysismentioning

confidence: 99%

“…Figure 2. Comparison between the simulations22,26 and the experimental measurements of pure HMN data from Yu et al25 …”

mentioning

confidence: 99%

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Investigating Autoignition Characteristics of Ammonia/Heptamethylnonane Mixtures Over Wide Pressure Ranges: Rapid Compression Machine Measurements and Kinetic Modeling Study

Zhang,

Zhou,

et al. 2024

Energy Fuels

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Ammonia (NH 3 ) blending combustion with highreactivity fuel has garnered substantial attention in terms of decarbonization potential in internal combustion engines. 2,2,4,4,6,8,8-Heptamethylnonane, denoted as HMN, an important large-molecular weight component for diesel and jet fuel surrogates, was selected to be blended with NH 3 in this study. The ignition delay times (IDTs) of NH 3 /HMN mixtures were measured using a heated rapid compression machine (RCM) over an extensive range of conditions (temperature of 680−1025 K, pressure of 20−100 bar, equivalence ratios of 0.5−1.0, and NH 3 energy ratio (NER) of 50−90%). Experimental results show that increasing the pressure, equivalence ratio, and oxygen concentration reduces both the total and first-stage IDTs, while an increase in the NH 3 energy ratio prolongs the IDTs. For the mixture with the lowest NH 3 energy ratio of 50%, non-Arrhenius-type behavior was observed at a pressure of 20 bar, while it transfers to a monotonic decrease of IDTs with increasing temperature at a pressure of 40 bar. An NH 3 /HMN blending mechanism was developed by merging individual NH 3 and HMN submechanisms, updating NH 3 submechanism, and adding C−N cross-reaction subset. Simulation results show that under most experimental conditions, the blending mechanism exhibits reasonable prediction on the measured NH 3 /HMN IDTs. Kinetic analysis shows that the discrepancy in the first-stage ignition between experiments and simulations may be associated with the inaccurate OH consumption proportion between HMN and NH 3 , while at the intermediate-temperature region, it may be related to the core C 0 −C 4 mechanism and the NH 3 -related reactions. Further experimental or quantum calculations are needed in the future to refine the NH 3 /HMN blending mechanism on the basis of this work.

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Section: Hmn Submechanismmentioning

confidence: 99%

Section: Kinetic Analysismentioning

confidence: 99%

Section: Kinetic Analysismentioning

confidence: 99%

“…Figure 2. Comparison between the simulations22,26 and the experimental measurements of pure HMN data from Yu et al25 …”

mentioning

confidence: 99%

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Investigating Autoignition Characteristics of Ammonia/Heptamethylnonane Mixtures Over Wide Pressure Ranges: Rapid Compression Machine Measurements and Kinetic Modeling Study

Zhang,

Zhou,

et al. 2024

Energy Fuels

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“…Ignition delay times of biodiesel and related surrogate fuels were measured in a heated RCM platform. Basic schematic of RCM was introduced in the previous studies − and here is a brief description. As shown in Figure , RCM is driven pneumatically by a creviced piston to suppress the roll-up vortex in the compression process.…”

Section: Experimental Setupmentioning

confidence: 99%

Experimental and Modeling Study on Autoignition of a Biodiesel/n-Heptane Mixture and Related Surrogate in a Heated Rapid Compression Machine

Lü

et al. 2019

Energy Fuels

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In this paper, ignition delay time of two kinds of biodiesel, soybean oil methyl ester (SME) and waste cooking oil methyl ester (WCOME) blended with n-heptane, were measured in a heated rapid compression machine (RCM). To meet the requirement of measuring high boiling fuels like biodiesel, several modifications were applied in RCM platform, which embodied in global preheating, reactant preparation, and gas dilution. Along with these methodologies, ignition delay times of SME30 and WCOME30 (30% biodiesel and 70% n-heptane in volume fraction) were measured at 15 bar, within temperature range of 641−772 K. Both biodiesels exhibited typical two-stage ignition characteristics and pronounced negative temperature coefficient behaviors. To better investigate the ignition process of biodiesel, novel surrogate fuels have been formulated including methyl decanoate, n-hexadecane, methyl trans-3-hexenoate, and 1,4-hexadiene, according to Chemical Deconstruction Methodology. Autoignition properties of surrogate and target biodiesel were investigated under the same conditions in RCM and good agreements have been found in point-to-point validation experiments, which verified good performance of quaternary surrogate fuels for biodiesel. Furthermore, kinetic models of biodiesel were proposed on the basis of surrogate fuels, which consisted of 4901 species and 18 669 reactions. The novel model has good predictions in ignition delay times in low-tointermediate temperature regions measured in RCM, and the kinetic model has great potentials in revelation of autoignition mechanisms and in development of CFD applications in internal combustion engines.

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An experimental and modeling study of n-hexadecane autoignition under low-to-intermediate temperatures

Wang

et al. 2019

Sci. China Technol. Sci.

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A study on the low-to-intermediate temperature ignition delays of long chain branched paraffin: Iso-cetane

Cited by 36 publications

References 16 publications

Investigating Autoignition Characteristics of Ammonia/Heptamethylnonane Mixtures Over Wide Pressure Ranges: Rapid Compression Machine Measurements and Kinetic Modeling Study

Investigating Autoignition Characteristics of Ammonia/Heptamethylnonane Mixtures Over Wide Pressure Ranges: Rapid Compression Machine Measurements and Kinetic Modeling Study

Experimental and Modeling Study on Autoignition of a Biodiesel/n-Heptane Mixture and Related Surrogate in a Heated Rapid Compression Machine

An experimental and modeling study of n-hexadecane autoignition under low-to-intermediate temperatures

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