Promoting “adiabatic core” approximation in a rapid compression machine by an optimized creviced piston design

Wu, Yingtao; Yang, Meng; Tang, Chenglong; Liu, Yang; Zhang, Peng; Huang, Zuohua

doi:10.1016/j.fuel.2019.04.030

Cited by 33 publications

(22 citation statements)

References 40 publications

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“…Figure shows the evolution of the IDTs in terms of neat iso-octane as a function of the inverse of temperature in this work, along with the available results from other groups. ,, It can be seen that the IDTs are consistent with the ones obtained by other research teams, and this implies that the RCM apparatus in Orleans is able to yield reliable experimental data among the combustion community. Besides, the state-of-art work can extend the temperature range from 600 to 950 K. Similar to the other studies, the negative temperature coefficient (NTC) temperature range of iso-octane was well characterized between 700 and 800 K, though the IDTs in this work were longer than some of those in other groups at temperatures above 750 K. As for the first-stage IDTs, at a temperature range from 675 to 775 K, they exhibited a monotonic decrease trend which was also observed by other groups.…”

Section: Resultssupporting

confidence: 80%

Effect of Exhaust Gas Recirculation and NO on Ignition Delay Times of Iso-octane in a Rapid Compression Machine

Song

et al. 2020

Energy Fuels

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The ignition delay times (IDTs) of iso-octane with or without exhaust gas recirculation (EGR) in the 600–950 K temperature range and at pressures of 20 and 30 bar were measured under various equivalence ratios (Φ = 0.6–1.4) with the aid of a rapid compression machine. As for neat iso-octane IDTs measurements at 20 bar, it was found that the IDTs obtained in this work were consistent with the ones measured by other groups. Notable prolonging effects can be seen at the negative temperature coefficient region with EGR, which is independent of equivalence ratios. Moreover, the IDTs with EGR under fuel-rich and stoichiometric conditions showed a similar trend at both 20 and 30 bar. In the presence of NO in EGR, at a temperature of 632 K and temperatures above 732 K, the promoting effect of NO was observed, resulting in reductions of the IDTs. In parallel, the influence of NO was negligible in the 667–732 K temperature range. A comprehensive detailed kinetic model was employed to interpret the experimental data. The model performance was improved by adopting a high-level theoretical calculation of the 2HO2 = H2O2 + O2 reaction. Merging the N submechanism into the core model by considering the interactions between NO x and C0–C2 species can generally capture the influence of NO on the IDTs. Reaction path analysis indicated that the NO + HO2 = NO2 + OH reaction dominated in the presence of NO and its reaction rate increased as a function of temperature, which can explain the different IDTs behaviors with NO addition.

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Section: Resultssupporting

confidence: 80%

Effect of Exhaust Gas Recirculation and NO on Ignition Delay Times of Iso-octane in a Rapid Compression Machine

Song

et al. 2020

Energy Fuels

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“…To clearly illustrate the combustion process of RP-3 spray, some typical stages during the pressure trace, as shown in Figure 3, were extracted, as shown in Figure 4. Before the compression, no in-cylinder vortex was observed in the window, whereas the mixture was compressed by the piston, and vortexes appeared from the window boundary near the piston top and gathered around the central region, which was consistent with our previous simulations [26]. The gaseous mixture was pushed into the core region of the chamber or into the piston crevice due to the piston motion.…”

Section: Data Collection and Analysis Processingsupporting

confidence: 90%

“…This method was demonstrated to be effective through comparison with the measured results by Nasir and Farooq [33]. An optimized piston [26] with a suitable hydraulic system [34] was used to restrain the in-cylinder roll-up and ensure homogeneity. Additionally, gaseous mixtures consisting of oxygen, nitrogen, and argon with purities all over 99.99% were charged into the chamber before the fuel injection, which guaranteed that no chemical reactions would happen during the compression stroke and further improved the assumption accuracy.…”

Section: Data Collection and Analysis Processingmentioning

confidence: 99%

“…The auto-ignition behaviors of RP-3, including the macroscopic spray development and combustion process, were recorded through high speed imaging over a wide range of initial chamber pressure and temperature conditions in an optical rapid compression machine (RCM). This RCM simulates the actual engine piston compression, and its thermodynamic conditions are well defined and can be accurately monitored [26]. The effects of injection pressure and injection delay times on IDT and combustion duration were also discussed.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on Auto-Ignition Characteristics of Kerosene Spray Flames

et al. 2022

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To facilitate the better use of RP-3 kerosene in compression ignition engines, the auto-ignition behaviors of RP-3 kerosene spray were experimentally investigated in an optical rapid compression machine. Results show that most of the tests have good ignitability and combustion performance. For all the successful ignited cases, the flame kernel was found to be formed before the steep rise of pressure, which explained that image-based ignition delay time is always shorter than the pressure-based ignition delay time. The effects of ambient environment, injection pressure, and injection delay time on the pressure history, ignition intensity, combustion duration, heat release rate, and other parameters were investigated individually. The ambient environment has a strong influence on ignition delay time by accelerating the chemical reactions, whereas the high injection pressure helps the better vaporization of fuel spray. The effect of injection delay time is non-monotonic as the trade-off relation between heat loss and blending of fuel and oxygen. The heat release rate histories under different conditions were compared and analyzed, and the two-stage heat release phenomenon was observed in the negative temperature coefficient region. The ignition intensity region was determined based on the measured ignition delay times of RP-3 kerosene spray, and multiple linear regression correlation was used to study the ignition delay time sensitivity to multi-factors.

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“…All the experiments regarding the ignition of C 2 H 6 /O 2 /Ar mixtures with or without NO 2 were conducted in a rapid compression machine (RCM), which has been elaborately described and validated in our previous publications. − The facility has five components, namely, a high-pressure stainless tank, a hydraulic stopping mechanism, a pneumatic driving chamber, a compression chamber, and a combustion chamber.…”

Section: Methodsmentioning

confidence: 99%

Experimental and Kinetic Study of the Promoting Effect of Nitrogen Dioxide on Ethane Autoignition in a Rapid Compression Machine

Deng

Zhao

et al. 2020

Energy Fuels

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Nitrogen oxides (NO x : NO2 and NO) are the main pollutants produced in combustion. Previous studies have focused on the NO x forming mechanism and control strategies but have paid less attention to the interaction between NO x and hydrocarbon fuels; even a small amount of NO x can significantly affect the ignitions of hydrocarbons. The ignition characteristic is of great importance for the optimization design and operation control of engines such as diesel engines, which are affected by the self-ignition characteristics of fuels. In this study, a rapid compression machine was used to measure the ignition delay times of seven fuel-lean C2H6/O2/Ar mixtures with [NO2]/[C2H6] ranging from 0.0 to 50% at T c = 760–970 K and P c = 30 bar. The results exhibit no negative temperature coefficient phenomenon in the ignition of ethane with or without NO2. A great reduction in the ignition delay time and the global activation energy is observed in the presence of NO2, which becomes more noticeable with increasing the NO2 concentration. Subsequently, four literature models involving the C2H6/NO2 chemistry were validated against the new measurements. Moreover, the key elementary reactions and important reaction channels controlling the ignition of C2H6/NO2 mixtures were then identified by the detailed chemical kinetic analysis.

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Promoting “adiabatic core” approximation in a rapid compression machine by an optimized creviced piston design

Cited by 33 publications

References 40 publications

Effect of Exhaust Gas Recirculation and NO on Ignition Delay Times of Iso-octane in a Rapid Compression Machine

Effect of Exhaust Gas Recirculation and NO on Ignition Delay Times of Iso-octane in a Rapid Compression Machine

Experimental Investigation on Auto-Ignition Characteristics of Kerosene Spray Flames

Experimental and Kinetic Study of the Promoting Effect of Nitrogen Dioxide on Ethane Autoignition in a Rapid Compression Machine

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