Experimental and modeling study of the autoignition characteristics of commercial diesel under engine-relevant conditions

Yu, Liang; Mao, Yebing; Qiu, Yue; Wang, Sixu; Li, Hua; Tao, Wei; Lü, Xingcai

doi:10.1016/j.proci.2018.05.173

Cited by 36 publications

(6 citation statements)

References 21 publications

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“…Ignition delay times of the diesel target fuel , and surrogate simulations (GCM1 surrogate, GCM2 surrogate, Pei surrogate) at T init = 600–1250 K, (a) φ = 0.37, P init = 10 bar, (b) φ = 0.37, P init = 15 bar, (c) φ = 0.5, P init = 10 bar, (d) φ = 0.5, P init = 15 bar, (e) φ = 0.67, P init = 10 bar, (f) φ = 0.67, P init = 15 bar, (g) φ = 0.67, P init = 20 bar, (h) φ = 1.0, P init = 15 bar, and (i) φ = 1.0, P init = 20 bar are shown in Figure . The initial gas fraction of the GCM1 surrogate, GCM2 surrogate, and Pei surrogate for ignition delay time simulations are provided in Table .…”

Section: Resultsmentioning

confidence: 99%

Novel Functional Group Contribution Method for Surrogate Formulation with Accurate Fuel Compositions

Herreros

Tsolakis

et al. 2020

Energy Fuels

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Current surrogate formulation methods usually adopt distillation profiles, density, viscosity, surface tension, molecular weight, research/motor octane number (RON/MON), cetane number (CN), heating value, H/C ratio, and threshold sooting index (TSI) as target properties, but these parameters are most likely unavailable for new fuel molecules and mixtures at the early stage of fuel development. A novel functional group contribution method (GCM) based on accurate fuel compositions is proposed to formulate surrogates effectively and quickly. This method can successfully replicate the density, sound speed, kinematic viscosity, ignition delay times, and speciations of POSF 4658, rapeseed methyl ester, diesel, and fuels for advanced combustion engines (FACE) C gasoline under a broad range of conditions (φ = 0.37–2.0, T init = 500–1600 K, P init = 1–20 atm), and its predictive capacity is superior to that of traditional methods in most cases. Fuel properties would match automatically between a surrogate and target fuel if the discrepancies of functional groups are minimized. Three important factors contribute to its high reproducibility: first, GCM captures the complicated dependence of fuel physical/chemical properties on the fuel molecular structure and functional groups; second, it correctly assumes that fuel physical and chemical properties are a sum result of the fuel molecular structure and functional groups; third, the functional group interactions and their effect on fuel reactivity are considered in the functional group classification system. The GCM can not only formulate in the normal direction from a complex target fuel to a simple surrogate fuel but also enable starting from a simple target fuel toward a complex surrogate fuel during fuel design in the refinery industry.

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Section: Resultsmentioning

confidence: 99%

Novel Functional Group Contribution Method for Surrogate Formulation with Accurate Fuel Compositions

Herreros

Tsolakis

et al. 2020

Energy Fuels

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“…The cetane number of diesel fuel used in this research is 42.3 and more detailed properties are revealed in the Table 1. According to the method of SH/T0606-2005 [25], the composition of diesel fuel was analyzed to understand the autoignition characteristics. To accurately control a solenoid force, the injector is controlled by an injector driver box and a LabView VI.…”

Section: Experimental Setup and Methodology Experimental Setupmentioning

confidence: 99%

Output Temperature Predictions of the Geothermal Heat Pump System Using an Improved Grey Prediction Model

Wang¹,

Wei²,

Pan³

et al. 2022

Advances in Energy Research

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In high altitude regions, affected by low pressure and low temperature atmosphere, diesel knock is likely to be encountered in heavy-duty engines operating at low-speed and high-load conditions. Diesel knock is commonly measured through pressure transducers, while there is lack of direct evidence and visualization images, such that its fundamental formation mechanism is still unclear. In this study, optical experiments on the severe diesel knock with destructive pressure oscillations were investigated in an optical rapid compression machine. High-speed direct photography and simultaneous pressure acquisition were synchronically performed, and different injection pressure and ambient pressure conditions were considered. The results show that for the given ambient temperature and pressure, diesel knock becomes prevalent at higher injection pressures where fuel spray impingement is enhanced. For the given injection pressure satisfying spray impingement, knock intensity is increased as ambient pressure is decreased. Further analysis on visualization images shows diesel spray impingement leads to longer ignition delay time, by which near-wall autoignition and supersonic reaction front propagation are induced. Consequently, three distinguishing stages can be observed during diesel knock, i.e. ignition delay, reaction front propagation, and pressure oscillation. Both spray impingement and fuel evaporation processes are considered as the main influencing factors.

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“…The in-cylinder pressure begins to rise and the PRR reaches the first peak at t = 0.45 ms after the TDC, or the time of Figure 11a. This peak is considered to be related to the first stage ignition of the fuel-air mixture, since diesel fuel has a two-stage ignition characteristic [25]. However, the first-stage ignition is difficult to be recorded by the camera due to its low natural luminescence intensity.…”

Section: Analysis Of Pressure Oscillationmentioning

confidence: 99%

“…Besides, the injector body is water-cooled to ensure the injector operates normally when the RCM is heated. [25], the composition of diesel fuel was analyzed to understand the autoignition characteristics. To accurately control a solenoid force, the injector is controlled by an injector driver box and a LabView VI (National Instruments).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Diesel Knock for High-Altitude Heavy-Duty Engines Using Optical Rapid Compression Machines

et al. 2020

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In high altitude regions, affected by the low-pressure and low-temperature atmosphere, diesel knock is likely to be encountered in heavy-duty engines operating at low-speed and high-load conditions. Pressure oscillations during diesel knock are commonly captured by pressure transducers, while there is a lack of direct evidence and visualization images, such that its fundamental formation mechanism is still unclear. In this study, optical experiments on diesel knock with destructive pressure oscillations were investigated in an optical rapid compression machine. High-speed direct photography and simultaneous pressure acquisition were synchronically performed, and different injection pressures and ambient pressures were considered. The results show that for the given ambient temperature and pressure, diesel knock becomes prevalent at higher injection pressures where fuel spray impingement becomes enhanced. Higher ambient pressure can reduce the tendency to diesel knock under critical conditions. For the given injection pressure satisfying knocking combustion, knock intensity is decreased as ambient pressure is increased. Further analysis of visualization images shows diesel knock is closely associated with the prolonged ignition delay time due to diesel spray impingement. High-frequency pressure oscillation is caused by the propagation of supersonic reaction-front originating from the second-stage autoignition of mixture. In addition, the oscillation frequencies are obtained through the fast Fourier transform (FFT) analysis.

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Experimental and modeling study of the autoignition characteristics of commercial diesel under engine-relevant conditions

Cited by 36 publications

References 21 publications

Novel Functional Group Contribution Method for Surrogate Formulation with Accurate Fuel Compositions

Novel Functional Group Contribution Method for Surrogate Formulation with Accurate Fuel Compositions

Output Temperature Predictions of the Geothermal Heat Pump System Using an Improved Grey Prediction Model

Analysis of Diesel Knock for High-Altitude Heavy-Duty Engines Using Optical Rapid Compression Machines

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