Gasoline compression ignition (GCI) combustion in a light-duty engine using double injection strategy

Ágarwal, Avinash Kumar; Solanki, Vishnu Singh; Krishnamoorthi, M.

doi:10.1016/j.applthermaleng.2023.120006

Cited by 20 publications

(2 citation statements)

References 66 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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“…Since its inception, numerous researchers have conducted studies on the GCI mode. Agarwal et al 5 compared the GCI mode with the CDC mode on a light-duty engine at BMEP 3–5 bar. The results showed that the GCI mode could obtain 5% higher BTE and comparable exhaust gas temperature than the CDC mode.…”

Section: Introductionmentioning

confidence: 99%

Investigation of injection parameters coupled with fuel reactivity on combustion and emissions in dual direct-injection GCI engine

Wu,

Mi,

Qian

et al. 2024

International Journal of Engine Research

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Fuel injection parameters and fuel reactivity significantly affect engine performance, combustion, and emissions. The dual direct-injection strategy could compensate for the insufficient heat release rate to improve the gasoline compression ignition (GCI) mode with medium injection pressure for high loads. This research aims to couple injection parameters and fuel reactivity to optimize the combustion, emissions, and engine performance of the dual direct-injection GCI mode at high loads. The effect of research octane number (RON) of gasoline, injection timing, and injection pressure of dual injection system on combustion and emissions was investigated. Results show that the optimized dual direct-injection GCI mode can simultaneously achieve high thermal efficiency, low emissions, and low maximum pressure rise rate (MPRR) at high loads with the maximum indicated mean effective pressure (IMEP) of about 16 bar with indicated thermal efficiency (ITE) of 48.5%. Delaying the injection timing of injector-1 reduced the peak pressure (Ppeak), MPRR, and NOx emissions. Ppeak, CO, NOx, and indicated specific fuel consumption (ISFC) decreased compared to the dual-injector simultaneous injection case when the injection timing of injector-2 was retarded to between 5 and 10°CA ATDC. Increasing the injection pressure of injector-2 reduced CO, THC, ISFC, and particulate emissions. Lower RON gasoline obtains higher ITE while higher RON gasoline obtains lower particulate emissions.

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Environmental Challenges and Economical Assessment of Methanol Transportation

Aydoğan,

Acaroğlu

2024

Reference Module in Chemistry, Molecular Sciences and Chemical Engineering

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Gasoline compression ignition (GCI) combustion in a light-duty engine using double injection strategy

Cited by 20 publications

References 66 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

Investigation of injection parameters coupled with fuel reactivity on combustion and emissions in dual direct-injection GCI engine

Environmental Challenges and Economical Assessment of Methanol Transportation

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