Co-effects of fuel research octane number and ethanol injection ratio on dual-fuel spark-ignition engine

Feng, Yongming; Jiang, Chenxu; Li, Zilong; Zhou, Qiyan; Lü, Xingcai

doi:10.1177/1468087419866589

Cited by 4 publications

(5 citation statements)

References 37 publications

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“…Tests were performed from 8:1 for pure gasoline to 16:1 for E84 blend. These results are in accordance with previous studies 29,[30][31][32] Qian et al 34 demonstrated that the knock-limited spark timing can be advanced progressively as the ethanol injection proportion is increased as well. Tests were carried out in a dual-fuel SI engine.…”

Section: Introductionsupporting

confidence: 93%

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A comparative analysis of knock severity in a Cooperative Fuel Research engine using binary gasoline–alcohol blends

Corral-Gómez

Rubio-Gómez

Rodríguez-Rosa

et al. 2020

International Journal of Engine Research

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Knock remains one of the main limitations for increasing the efficiency in spark-ignition engines. The use of certain alcohol–gasoline blends is an effective way to either mitigate or eliminate knock, allowing the use of higher compression ratios, therefore increasing the efficiency of spark-ignition engines. Methanol and ethanol are alcohols commonly employed for reducing knock, due to their higher octane number and vaporization heat value. Major attention is being paid recently to butanol and its blends with gasoline since they present similar characteristics to gasoline; however, it was found to be the least knock resistant among the three fuels. In the present work, a comparison between the knock performance of methanol–gasoline, ethanol–gasoline and butanol–gasoline blends is carried out, by volume concentrations up to 20 v/v%. This comparison is made in terms of knock intensity and knock probability. Tests are performed in a single-cylinder, variable-compression ratio, Cooperative Fuel Research engine equipped with port fuel injection system, facilitating the comparison against future results obtained by similar experimental facilities. Results obtained allow to reach meaningful conclusions about the capacity of each blend to mitigate knock.

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Section: Introductionsupporting

confidence: 93%

“…Qian et al 34 demonstrated that the knock-limited spark timing can be advanced progressively as the ethanol injection proportion is increased as well. Tests were carried out in a dual-fuel SI engine.…”

Section: Introductionmentioning

confidence: 99%

A comparative analysis of knock severity in a Cooperative Fuel Research engine using binary gasoline–alcohol blends

Corral-Gómez

Rubio-Gómez

Rodríguez-Rosa

et al. 2020

International Journal of Engine Research

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show abstract

“…The authors' results showed that output brake power was improved and the NOx emissions decreased, but the HC and CO emissions were increased. Similar outcomes were attained by Qian et al [16] as they investigated the effect of the volume ratio of ethanol fuel port injection on the combustion and emissions performance. The engine knock limit was advanced with an increased ratio of ethanol fuel due to the high cooling effect of ethanol fuel caused by the large ethanol latent heat of vaporisation [17].…”

Section: Introductionsupporting

confidence: 75%

Performance of Combustion and Emissions Characteristics of Ethanol Dual Injection Spark Ignition Engine

Al-Muhsen

Hong

Ismail

2021

IJAME

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Ethanol dual injection (DualEI) is a new technology to maximise the benefits of ethanol fuel to the spark-ignition engine. In this study, the combustion and emissions characteristics in a DualEI spark-ignition engine with a variation of the direct injection (DI) ratio and engine speed were experimentally investigated. The volume ratio of DI was varied from 0% (DI0%) to 100% (DI100%), and two engine speeds of 3500 and 4000 RPM were tested. The spark timing for maximum brake torque (MBT) was first determined, and then the results of the effect of DI ratio on the engine performance at the MBT conditions were discussed and analysed. The results showed that the MBT timing for the DI and spark timings were 330 and 30 CAD bTDC, respectively. At the MBT timing, the indicated mean effective pressure slightly increased from 0.47 to 0.50 MPa when the DI ratio increased from DI0% to DI100%. However, the maximum combustion pressure significantly decreased by 8.32%, and volumetric efficiency increased by 4.04%. This was attributed to the reduced combustion temperature due to the cooling effect of ethanol fuel enhanced by the DI strategy. The indicated specific carbon monoxide and hydrocarbons significantly increased due to poor mixture quality caused by fuel impingement associated with the overcooling effect. However, the indicated specific nitric oxides significantly decreased due to the temperature reduction inside the combustion chamber. Results showed the potential of DualEI to increase the compression ratio and consequently increase the engine thermal efficiency without the risk of engine knock.

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“…Alcohols, as a significant family of ecofriendly potential biofuels that can be synthesized from various renewable feedstocks, including forest wood, marine algae, and agricultural residuals, are receiving increasing attention. In the past few years, short-chain alcohols, including methanol and ethanol, have attracted extensive research interests regarding their fundamental combustions − and practical applications in spark-ignition (SI) engines , due to their well-established production infrastructure and excellent knock resistance. However, the low cetane number (CN), high latent heat of evaporation, poor miscibility, and poor lubricating properties result in many drawbacks when using them in compression ignition (CI) engines.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study of 3-Pentanol Autoignition: Ab Initio Calculation, Shock Tube Experiments, and Kinetic Modeling

et al. 2021

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3-Pentanol is a potential alternative fuel or a green fuel additive for modern engines. The H-abstraction reactions from 3-pentanol by H, CH 3 , HO 2 , and OH radicals are significant in the 3-pentanol oxidation process. However, corresponding rate constants are forced to rely on either analogy from sec-butanol or estimation from alkanes due to a lack of direct experimental and theoretical study. In this work, stationary points on the potential energy surfaces (PESs) were calculated with the high-level DLPNO-CCSD(T)/CBS(T-Q)// M06-2X/cc-pVTZ method, which is further used to benchmark against the CBS-QB3 method. Then, the high-pressure limit rate constants for target reactions, over a broad range of temperature (400−2000 K), were calculated with the phase-space theory and conventional transition state theory. A comparison was made between the calculated rate constants and the values available in Carbonnier et al. [Proc. Combust. Inst. 2019, 37(1), 477−484]. The rate constants for the above H-abstraction reactions in the Carbonnier model were updated with the calculated results, followed by a modification based on the computed results of 3-pentanol + HO 2 to obtain the revised model. Validation against the shock tube (ST) and the jet-stirred reactor (JSR) measurements from the literature proved the revised model an optimal one. Furthermore, using an ST, ignition delay times (IDTs) for the 3-pentanol/air mixtures were measured spanning a temperature range of 920−1450 K, pressures of 6, 10, and 20 bar, and equivalence ratios of 0.5, 1.0, and 1.5. Generally, IDTs decrease with increasing temperature and reflected shock pressure. Improved predictions to present experimental data were obtained by using the revised model as compared with the Carbonnier model. Finally, sensitivity analysis was conducted using the revised model to gain an in-depth comprehension of the 3-pentanol autoignition.

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Co-effects of fuel research octane number and ethanol injection ratio on dual-fuel spark-ignition engine

Cited by 4 publications

References 37 publications

A comparative analysis of knock severity in a Cooperative Fuel Research engine using binary gasoline–alcohol blends

A comparative analysis of knock severity in a Cooperative Fuel Research engine using binary gasoline–alcohol blends

Performance of Combustion and Emissions Characteristics of Ethanol Dual Injection Spark Ignition Engine

Theoretical and Experimental Study of 3-Pentanol Autoignition: Ab Initio Calculation, Shock Tube Experiments, and Kinetic Modeling

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