Interactive control of combustion stability and operating limits in a biogas-fueled spark ignition engine with high compression ratio

Jaramillo, J.; Zapata, Julian A; Bedoya, Iván D.

doi:10.1007/s12008-017-0446-4

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…Similarly, the CoV for the crank angle location of peak pressure can also be defined in this manner and provides an opportunity for further investigation of the cyclic variability and knocking propensity at a given condition. This statistical parameter is often applied to evaluate cyclic variability within engine studies. ,,− …”

Section: Methodsmentioning

confidence: 99%

Influence of Iso-Butanol Blending with a Reference Gasoline and Its Surrogate on Spark-Ignition Engine Performance

Michelbach

Tomlin

2021

Energy Fuels

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This study investigated the ability of a five-component gasoline surrogate (iso-octane, toluene, n-heptane, 1-hexene, and ethanol) to replicate the combustion and knocking behavior of a reference gasoline (PR5801 – RON 95.4, MON 86.6), under pressure boosted spark-ignition engine conditions at various levels of blending with iso-butanol. The ability of the neat surrogate was first evaluated for stoichiometric air/fuel mixtures, at an intake temperature and pressure of 320 K and 1.6 bar, respectively, and an end of compression pressure of 30 bar, over a range of spark discharge timings. Throughout this regime, the surrogate was found to produce a good representation of the gasoline, particularly in terms of mean engine cycle properties, knock onsets, and knock intensities. This high degree of similarity between the surrogate and gasoline has also seen previous rapid compression machine work, at comparable end-gas temperatures (Int. J. Chem. Kinet.202153787808). However, significant differences were observed between the cyclic variability of surrogate and gasoline results, which was attributed to compositional differences between the two fuels. This study also investigated the impact of iso-butanol blending (at ratios of 5–70% iso-butanol by volume) on the performance of the gasoline at knocking and nonknocking conditions, as well as the ability of the surrogate to replicate the observed blending behavior, at the same experimental conditions. In general, increasing the iso-butanol volume was shown to decrease the knocking propensity of the fuel, except for a nonlinear crossover behavior witnessed for 5% and 10% iso-butanol blends, wherein the 5% blend became less reactive than the 10% blend due to the heavy suppression of NTC behavior in the 10% blend. Even at such low concentrations, iso-butanol appears to act as a strong radical sink, as identified by brute-force sensitivity analysis of predicted knock onsets. This is consistent with the findings of the aforementioned rapid compression machine study. Blends of 20–50% iso-butanol were found to be optimal for use in SI engines, providing considerable antiknock benefits and comparable indicated power to gasoline, with blends of 20–30% being the most viable due to the lower quantities of biofuel required. Under blending with iso-butanol, the surrogate continued to perform well, but blends were observably less reactive than the corresponding gasoline blends at spark advance timings <8 °CA before top dead center. The consistency found between trends within the literature sourced rapid compression machine measurements, and engine data presented in this study highlight the proficiency of fundamental measurements in predicting combustion behavior within an engine at similar thermodynamic conditions.

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Section: Methodsmentioning

confidence: 99%

Influence of Iso-Butanol Blending with a Reference Gasoline and Its Surrogate on Spark-Ignition Engine Performance

Michelbach

Tomlin

2021

Energy Fuels

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“…Karagoz et al 17 evaluated the effect of two biogas compositions (13 and 49% of CO 2 by volume in the fuel mixture of CH 4 and CO 2 ) on engine vibrations at 1500 rpm and found that the amplitude of vibrations was higher for higher amount of the inert gas in the fuel mixture. Jaramillo et al 18 studied the engine combustion instabilities fueled with biogas at 1800 rpm for the equivalence ratios of 0.6, 0.85, and 1. They also found out that the COV of IMEP increased from 0.6 to 7.7% when the equivalence ratio was reduced from 1 to 0.6.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cycle-To-Cycle Combustion Variations in a Spark-Ignition Engine Operating under Various Biogas Compositions

Gupta

Mittal

2019

Energy Fuels

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Biogas is a renewable energy fuel (which can also be upgraded to biomethane), and it has the potential to substitute fossil fuels. In the present study, the effect of various biogas compositions on cycle-to-cycle variations (CCVs) of combustion is investigated while operating a spark-ignition engine at a compression ratio of 8.5:1 and engine speed of 1500 rpm. In addition, the percentage of CO2 that could be removed from a typical biogas composition (i.e., 60% CH4 and 40% CO2, by volume) as a compromise between the biogas upgrading cost and engine combustion characteristics is also determined. For a better understanding of the combustion process, a CFD model of the engine was also developed with detailed chemical kinetics, and it was validated with the experimental data. For various biogas compositions (including biomethane), carbon dioxide (CO2) percentage was varied from 0 to 40% in the fuel mixture of methane and CO2. The study showed that a linear relationship existed between peak cylinder pressure and its location, which was weakened with the increase of the CO2 percentage in the fuel mixture, and a hook-back phenomenon was observed for the case with 40% CO2 in the fuel mixture. The CCVs of indicated mean effective pressure (IMEP), flame initiation, and combustion durations were increased with the increase of the CO2 percentage in the fuel mixture. The CFD model showed that this is due to the degradation in the flame propagation process, as the concentrations of OH, H, and O radicals were found to decrease with the increase in the CO2 percentage. At a low load of 8 Nm, coefficient of variation of IMEP was increased from 3.4 to 3.6% when the CO2 percentage was increased from 0 to 20% in the fuel mixture, which, however, was significantly increased to 7.5 and 12.7% for 30 and 40% of CO2, respectively. Overall, the combustion process was significantly degraded when CO2 was more than 20% in the fuel mixture. Therefore, the removal of 20% of CO2 from a typical biogas composition provides a good compromise between the biogas upgrading cost and engine combustion characteristics.

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Investigating the effect of the air inlet temperature on the combustion characteristics of a spark ignition engine fueled by biogas

et al. 2020

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This work has conducted a numerical study using AVL‐Boost engine simulation utilizing biogas (CH4 and CO2)–air mixtures in a SI engine model. The effect of varying the air manifold temperature from 25 to 50°C on the combustion characteristics as well as engine performance under full load condition in a SI engine fueled by gasoline and biogas mixtures has been investigated. The performed tests involved using variable concentrations of CO2 from 10% to 40% by volume. The current model has been validated with experimental results and it was found that the error in predicting the P‐θ behavior of the engine is about 4.89%. The results showed that, as the air inlet temperature increases, the volumetric efficiency decreases and the brake specific fuel consumption (BSFC) increases for gasoline and all biogas compositions. However, the peak pressure, brake output power, maximum pressure rise rate, and maximum heat release rate were decreased slightly with the increase in air inlet temperature. The effect was only observed for gasoline and the 10%‐CO2 biogas, whereas the effect on the maximum heat release rate was detected on gasoline and biogas compositions up to 20%‐CO2 only. On the other hand, the existence and growth of CO2 content in the biogas reduced significantly the peak pressure, brake output power, maximum pressure rise rate, volumetric efficiency, and both net and maximum heat release rates, though its effect in reducing the volumetric efficiency stopped at 20%‐CO2 biogas. Furthermore, BSFC rises noticeably with the increase in CO2 ratio in biogas. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Interactive control of combustion stability and operating limits in a biogas-fueled spark ignition engine with high compression ratio

Cited by 8 publications

References 18 publications

Influence of Iso-Butanol Blending with a Reference Gasoline and Its Surrogate on Spark-Ignition Engine Performance

Influence of Iso-Butanol Blending with a Reference Gasoline and Its Surrogate on Spark-Ignition Engine Performance

Analysis of Cycle-To-Cycle Combustion Variations in a Spark-Ignition Engine Operating under Various Biogas Compositions

Investigating the effect of the air inlet temperature on the combustion characteristics of a spark ignition engine fueled by biogas

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