Influence of port-inducted ethanol or gasoline on combustion and emission of a closed cycle diesel engine

Wu, Hung‐Wei; Wang, Ren Hung; Chen, Ying Chuan; Ou, Dung Je; Chen, Teng Yu

doi:10.1016/j.energy.2013.11.027

Cited by 28 publications

(23 citation statements)

References 13 publications

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“…Besides, the differences in physicochemical properties between CO2 and nitrogen are listed in Table 1, which has a major influence on combustion characteristics of OFC and Conventional Air Combustion (CAC) [10][11] [12]. [18] demonstrated that the combustion performance of CCDE could be improved with by changing intake components. Mobasheri et al [19][20] numerically investigated the effects of OFC on engine operating conditions and combustion characteristics in Homogenous Charge Compression Ignition (HCCI) engine under different diluent strategies.…”

Section: X H Y + ( +mentioning

confidence: 99%

Numerical study on the effects of intake charge on oxy-fuel combustion in a dual-injection spark ignition engine at economical oxygen-fuel ratios

Pei

Peng

et al. 2021

International Journal of Engine Research

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In order to decrease Carbon Dioxide (CO2) emissions, Oxy-Fuel Combustion (OFC) technology with Carbon Capture and Storage (CCS) is being developed in Internal Combustion Engine (ICE). In this article, a numerical study about the effects of intake charge on OFC was conducted in a dual-injection. Spark Ignition (SI) engine, with Gasoline Direct Injection (GDI), Port Fuel Injection (PFI) and P-G (50% PFI and 50% GDI) three injection strategies. The results show that under OFC with fixed Oxygen Mass Fraction (OMF) and intake temperature, the maximum Brake Mean Effective Pressure (BMEP) is each 5.671, 5.649 and 5.646 bar for GDI, P-G and PFI strategy, which leads to a considerable decrease compared to Conventional Air Combustion (CAC). [Formula: see text], [Formula: see text] and [Formula: see text] of PFI are the lowest among three injection strategies. With intake temperature increases from 298 to 378 K, the reduction of BMEP can be up to 12.68%, 12.92% and 12.75% for GDI, P-G and PFI, respectively. Meantime, there is an increase of about 3% in Brake Specific Fuel Consumption (BSFC) and Brake Specific Oxygen Consumption (BSOC). Increasing OMF can improve the performance of BMEP and BSFC, and the trend is more apparent under GDI strategy. Besides, an increasing tendency can be observed for cylinder pressure and in-cylinder temperature under all injection strategies with the increase of OMF.

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Section: X H Y + ( +mentioning

confidence: 99%

Numerical study on the effects of intake charge on oxy-fuel combustion in a dual-injection spark ignition engine at economical oxygen-fuel ratios

Pei

Peng

et al. 2021

International Journal of Engine Research

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“…The concentration stratification of charge in the cylinder can be controlled by fuel injection strategy, such as different injection timings and multiple injection strategy [20,21,22,23], combination of port injection and multiple injection strategy [24,25,26,27,28], and so on. For instance, a double-injection strategy has shown the independent control of mixture homogeneity of the early first injection and charge stratification of the late second injection, which cause a lower rate of pressure rise, extended high-load limit, and better combustion stability [29,30,31,32].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Combustion Kinetics of Partially Premixed Combustion (PPC) Fueled with Primary Reference Fuel

Zhao

Wang

Liu

et al. 2020

SAE Technical Paper Series

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This work numerically investigates the detailed combustion kinetics of partially premixed combustion (PPC) in a diesel engine under three different premixed ratio fuel conditions. A reduced Primary Reference Fuel (PRF) chemical kinetics mechanism was coupled with CONVERGE-SAGE CFD model to predict PPC combustion under various operating conditions. The experimental results showed that the increase of premixed ratio (PR) fuel resulted in advanced combustion phasing. To provide insight into the effects of PR on ignition delay time and key reaction pathways, a post-process tool was used. The ignition delay time is related to the formation of hydroxyl (OH). Thus, the validated Converge CFD code with the PRF chemistry and the post-process tool was applied to investigate how PR change the formation of OH during the low-to high-temperature reaction transition. The reaction pathway analyses of the formations of OH before ignition time were investigated. It was found that in the case of PR0%, the second isomerization from C7H14OOH2-4O2 to NC7KET24 and the decomposition of NC7KET24 contributed 27.6% and 46.46% of OH formation respectively. The contribution of AC8H16OOH-B to the formation of OH was just 12.13%. It can be concluded that the low temperature oxidation reactions of n-heptane were key steps in producing OH. While in the cases of PR30% and PR50%, because of the higher in-cylinder temperature, most of OH derived from the decomposition reaction of H2O2 that contributed 54.47% and 54.63% of OH formation respectively. Besides, in the PR30% and PR50%, the oxidation reactions of IC4H7 contributed 31.95% and 33.84% of OH formation respectively, and the oxidation reaction of IC4H6OH contributed 19.08% and 22.22% of OH formation respectively, which indicated that the oxidation of iso-octane also contributed to the production of OH. In addition, the distributions of mass fraction, production rate and representative creation reaction (RCR) of OH showed that in the case of PR30% and PR50%, the formation of OH outside the spray periphery were dominated by the reactions R394 (H2O2 (+ M) <=> 2 OH (+ M)), while that in the spray periphery were predominantly controlled by the reaction R21 (NC7KET24 => NC3H7CHO + CH3COCH2 + OH) and R125 (IC4H6OH + HO2 <=> CH2CCH2OH + CH2O + OH). Premixed fuel from port injection changed the formation pathway of OH during the oxidation of direct injection fuel through the reaction R125.

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“…The authors evaluated the performance of a direct-injection diesel engine fueled with 1-pentanol/diesel fuel blends. Wu et al 32 improved the combustion and emissions of the diesel engine in the closed-cycle diesel engine system using diesel fuel as the primary fuel with ethanol or gasoline of various energy share ratios inducted into the inlet port. Additionally, Liu et al 33 conducted experimental and numerical studies on the combustion and emissions of an n-butanol/biodiesel dual-fuel injection system, in which n-butanol was injected into the intake port, while soybean biodiesel was directly injected into the cylinder.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on partially premixed compression ignition combustion fueled with a low octane number primary reference fuel using two-stage fuel supplying

Wang

Huang

et al. 2015

International Journal of Engine Research

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An experimental study of partially premixed compression ignition combustion with low octane fuel was conducted on a single-cylinder engine. The effects of the external exhaust gas recirculation and intake boost on this partially premixed compression ignition combustion and emissions were investigated. During the experiments, a trade-off relationship between the NO x and smoke emissions was observed in this partially premixed compression ignition combustion. However, heavy exhaust gas recirculation usage has the potential to decrease NO x and soot emissions simultaneously at the expense of the fuel economy. It is determined that at an increased intake port pressure, the maximum in-cylinder pressure increases, and the ignition timing of the high-temperature combustion is retarded. Also, the peak value of the low-temperature combustion is slightly depressed, the peak value of the high-temperature heat release decreases significantly, and the maximum value of the diffusing burn increases to some extent. Compared to natural aspirated condition, the partially premixed compression ignition combustion with intake boost has the capability of simultaneously reducing NO x and soot emissions to ultra-low levels, that is, the intake boost could be an important strategy for the combustion and emission improvement in this advanced engine combustion mode.

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Influence of port-inducted ethanol or gasoline on combustion and emission of a closed cycle diesel engine

Cited by 28 publications

References 13 publications

Numerical study on the effects of intake charge on oxy-fuel combustion in a dual-injection spark ignition engine at economical oxygen-fuel ratios

Numerical study on the effects of intake charge on oxy-fuel combustion in a dual-injection spark ignition engine at economical oxygen-fuel ratios

Numerical Investigation of the Combustion Kinetics of Partially Premixed Combustion (PPC) Fueled with Primary Reference Fuel

Experimental study on partially premixed compression ignition combustion fueled with a low octane number primary reference fuel using two-stage fuel supplying

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