An experimental study of performance, combustion and emissions characteristics of an ethanol HCCI engine using water injection

Telli, Giovani Dambros; Zulian, Guilherme; Lanzanova, Thompson; Martins, Mario; Rocha, Luíz Alberto Oliveira

doi:10.1016/j.applthermaleng.2021.118003

Cited by 21 publications

(6 citation statements)

References 51 publications

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“…Compositional stratification is an integral part of new combustion technologies such as Low-Temperature Combustion (LTC), Homogeneous Charge Compression Ignition (HCCI), Moderate and Intense Low-oxygen Dilution (MILD), etc. The compositional stratification is generally achieved in engines using direct injection inside the combustion chamber [4][5][6] or by dilution of the fuel-air mixture [7][8][9]. With stratification, stoichiometric or slightly rich mixtures can be used near the ignition source, and ultra-lean mixtures can be used near the chamber walls.…”

Section: Introductionmentioning

confidence: 99%

A Detailed Analysis of Mixture Stratification on Flame Displacement Speed for Syngas Combustion

Patil,

Sreedhara

2024

Flow Turbulence Combust

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Gasoline direct injection (GDI) engines can provide higher thermal efficiency and lower emissions compared to conventional combustion techniques. The direct charge injection near the ignition source forms compositional stratification inside the combustion chamber.Compositional stratification inside the combustion chamber opens possibilities for ultra-lean and low-temperature combustion. In this paper, a 2D direct numerical simulation (DNS) has been performed to investigate the propagation of syngas flame in an equivalence ratio stratified medium. A spherically expanding flame has been initiated with a hotspot at the center of thedomain. An open-source PENCIL code [Babkovskaia, 2011] is used to analyse the effect of stratification by simulating cases with varying integral scales of mixing (lϕ) and fluctuations of equivalence ratio (ϕ´). Effects of differential diffusion of species on flame propagation have also been examined by comparing results with cases with unity Lewis number (Le=1). The results show that with an increase in lϕ, flame propagation shows a non-monotonic behavior.With an increase in lϕ, the flame speed and extent of burning increase first and then decrease.With an increase in ϕ´, the flame speed and extent of burning decreased consistently. The peak reaction rate of fuel species is also observed to be shifted to a higher reaction progress variable (c) with increased stratification. The effect of stratification and differential diffusion has been analysed for four identified components of flame displacement speed (Sd) viz. reaction (Sr), normal diffusion (Sn), tangential (St), and inhomogeneity (Sz). Sr and Sn are observed to be major contributors to Sd. The magnitude of Sr shows reductions with an increase in stratification. In comparison, Sn does not show significant change with increased stratification.The variation of the contribution of chemical reactions to heat release rate with stratification is also analysed in this study. The results show that shifting of peak reaction rate of fuel species to higher c values results in variation in heat release rate contribution for chemical reactions.

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Section: Introductionmentioning

confidence: 99%

A Detailed Analysis of Mixture Stratification on Flame Displacement Speed for Syngas Combustion

Patil,

Sreedhara

2024

Flow Turbulence Combust

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“…In recent decades, advancements in the realms of thermodynamics, chemical reaction kinetics [15], and computational fluid dynamics (CFD) have been significant [16]. These strides have given rise to sophisticated simulation technologies that incorporate both CFD and chemical kinetics [17], now deemed indispensable for investigating intricate combustion processes within diesel engines [18].…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis on Combustion Control of Diesel Engines Fueled with Ester Alcohol Diesel

Zhou,

Zhang,

et al. 2023

Energies

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As the urgency for environmental sustainability escalates globally, the exploration of alternative fuels for diesel engines becomes a crucial endeavor. By combining chemical reaction kinetics and three-dimensional simulation software, the combustion and emission characteristics of a diesel engine fueled with two oxygenated fuels, hydrogenated biodiesel and ethanol, and adopting a multi-stage injection strategy were studied. The combustion mechanism of hydrogenated biodiesel ethanol diesel hybrid fuel was established, and the reaction activity of ester alcohol diesel with different mixing ratios was studied through reaction flow analysis at high and low OH temperatures. The established mechanism was coupled with CFD 2021 three-dimensional simulation software to compare the combustion and emission performance of diesel engines fueled with different ratios of ester alcohol diesel. The results show that as the proportion of ester alcohol mixture increases, at low temperatures, the OH generation rate decreases, the consumption rate increases, and the reaction activity decreases, which is not conducive to the promotion of combustion reaction; at high temperatures, the generation rate of OH increases, the consumption rate decreases, and the reaction activity increases, which is conducive to the promotion of combustion reactions. Compared to diesel, the reaction system activity of mixed fuel is enhanced, and the main peak values of cylinder pressure and instantaneous heat release rate are higher than that of diesel. The diffusion of oil and gas in the cylinder is improved. As the proportion of ester alcohol diesel mixture increases, the oxygen content increases, nitrogen oxides emissions increase compared to diesel, and soot emissions decrease compared to diesel. Soot emissions are mainly distributed in areas with a high equivalence ratio and high temperature, which is consistent with the distribution area of C2H2, the precursor of soot generation.

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“…6,7 As a result of early fuel injection timings, combustion rate being uncontrollable, knocking happens more frequently in HCCI engine than conventional diesel engine. 8,9 To address these challenges, scientists have come up with innovative ideas that could be categorized widely into strategies for thermal and fuel management traditional diesel engines include steps like intake charge preheating, 10 supercharging 11 dilution of charge using Exhaust Gas Recirculation (EGR), 12 compression ratio is varied, 13 direct infusion of water, 14 and residual gas trapping. 15 The fuel management strategies include using dual fuel in precise amounts in order to ensure maximum fuel reactivity.…”

Section: Introductionmentioning

confidence: 99%

Effects of multiple fuel injection schedules and LPG energy share on combustion stability and output characteristics of dual-fuel HCCI engine

Saiteja

Hadhi

Kiran

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Homogeneous Charge Compression Ignition (HCCI) engine is a prominent solution to satisfy the stringent NOx emission norms. The current study investigates the influence of fuel injection strategies and LPG energy share on dual fuel powered HCCI engine at 1.8 bar and 3.6 bar BMEP at constant speed (2700 rpm) and injection pressure (50 MPa). Over the study D + LPO used as primary fuel and LPG as secondary fuel. The fuel injection strategies alike single, double, as well multi-pulse modes are studied at injection timings of 90obTDC aimed at single-pulse, 120°& 90°bTDC for double-pulse, 120°, 90°, & 30°bTDC for multi-pulse modes. All single, double, and multi-pulse injection modes at 0% LPG energy share obtains greater combustion rate and advanced combustion phasing. Further increase in LPG energy share, the rate of combustion is lessened and retarded toward TDC, consequently it enhanced the performance and emission characteristics of an HCCI engine. The optimum LPG energy share for single-pulse, double-pulse, and multi-pulse injections modes are 46.80%, 63.25%, and 78.06% respectively for 1.8 bar BMEP. For 3.6 bar BMEP optimum LPG energy shares are found to be 41.79%, 58.55%, and 71.76% for single, double, and multi-pulse injection respectively.

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An experimental study of performance, combustion and emissions characteristics of an ethanol HCCI engine using water injection

Cited by 21 publications

References 51 publications

A Detailed Analysis of Mixture Stratification on Flame Displacement Speed for Syngas Combustion

A Detailed Analysis of Mixture Stratification on Flame Displacement Speed for Syngas Combustion

Computational Analysis on Combustion Control of Diesel Engines Fueled with Ester Alcohol Diesel

Effects of multiple fuel injection schedules and LPG energy share on combustion stability and output characteristics of dual-fuel HCCI engine

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