An Experimental and Modeling Study to Investigate Effects of Two-Stage Direct Injection Variations on HCCI Combustion

Türkcan, Ali; Özsezen, Ahmet Necati; Çanakçı, Mustafa; Soyhan, Hakan Serhad; Demir, Üsame

doi:10.1080/00102202.2014.960562

Cited by 15 publications

(7 citation statements)

References 29 publications

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“…Nevertheless, the following combustion process is slower because cold zones ignite later. This thesis was proven on the basis of modelling and experimental studies [20][21][22]. At extensively stratified mixture (strategy C) the fuel does not premix well before the auto-ignition.…”

Section: Resultsmentioning

confidence: 96%

HCCI combustion control using advanced gasoline direct injection techniques

Hunicz

Mikulski²,

Komsta

2018

MATEC Web Conf.

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Homogeneous Charge Compression Ignition (HCCI) is a promising low temperature combustion technology for reciprocating engines that offers high fuel efficiency and extremely low exhaust emissions. However, combustion control should be improved and operating range should be widened for the technology to achieve production level. In this study an overview of different direct gasoline injection control approaches, applied to improve stability at low engine loads and to reduce pressure rise rates at high load regime, is presented. The tests are performed on a single-cylinder research engine operated in a negative valve overlap (NVO) mode for residual gasses trapping. The investigated direct injection schemes included: (i) fuel injection during the NVO period to improve mixture reactivity and take an advantage of exhaust-fuel reactions thermal effects, (ii) fuel injection during intake stroke to create homogeneous charge and (iii) late fuel injection during compression stroke to create stratified charge. The results showed that application of early NVO injection enables active control of combustion timing at nearly idle conditions. The late fuel injection, during the compression stroke, enabled mitigation of excessive pressure rise rates at high engine load regime.

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Section: Resultsmentioning

confidence: 96%

HCCI combustion control using advanced gasoline direct injection techniques

Hunicz

Mikulski²,

Komsta

2018

MATEC Web Conf.

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“…Around the literature it is very easy to find works about these simulations to characterize the combustion process, comparing the CFD results with experimental data. 21,22 Nevertheless, the required time and computing power make these tools sometimes unafordable, and their use is restricted to a few number of operating points.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the turbulent flame front surface in spark ignition engines during spark ignition operation to identify controlled auto-ignition and abnormal combustion

Macián

López

Martín

et al. 2020

International Journal of Engine Research

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The combustion diagnostics and subsequent analysis are standardized tools based on the estimation of the heat release law (HRL). From this estimation, the different combustion parameters can be obtained: combustion phasing and duration, heat release rate, and so on. This analysis might be usually enough to study traditional spark ignition (SI) engines. However, with the new upcoming SI engines, this is probably not the case anymore, since different combustion modes can be operated in the same engine, as for instance a combination of SI and controlled auto-ignition (CAI) combustion modes. When different combustion modes are combined, it seems interesting to study in more depth the HRL, trying to get more data and to study the differences among the diverse combustion modes. Toward this end, a methodology to go deeper in the study of the HRL is proposed in this work, consisting of, mainly quantifying and taking into account the most relevant influencing parameters: the fuel properties (mainly its lower heating value), the in-cylinder oxygen content, the density of the burned and unburned zones, the laminar combustion speed, and the turbulence effect. With the proposed methodology, a standard SI combustion, developed by a flame front, can be characterized at any given operating point. This would allow to predict which the combustion developement would be, at this operating point, assuming it to be developed by a flame front. Subsequently, this SI combustion prediction can be compared to the one obtained experimentally, making it possible to identify and analyze abnormal combustion phenomena, as well as to study the differences between a combustion developed by a flame front (SI) and by auto-ignition (CAI). Derived from this work, an alternative equation to experimentally characterize the laminar combustion velocity has also been proposed, in order to improve its applicability in a wider range of fuel/air ratios and dilution degrees.

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“…A feasible method to achieve and control stratification in the combustion chamber is direct injection of some portion of fuel at late stage of the compression stroke. At late injection there is not enough time for mixing of the fuel vapour with remaining in-cylinder fluid [16]. Additionally, this process enhances thermal stratification, because the heat for fuel vaporisation reduces temperature locally.…”

Section: Introductionmentioning

confidence: 99%

Late direct fuel injection for reduced combustion rates in a gasoline controlled auto-ignition engine

Hunicz¹,

Mikulski²,

Gęca³

et al. 2018

THERM SCI

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Homogeneous charge compression ignition concepts despite high efficiency and ultra-low nitrous oxides emissions, suffer from week controllability and load range limited by excessive pressure rise rates. In the present work, controlled auto-ignition is achieved via direct injection of gasoline into the exhaust gasses recompressed during negative valve overlap phase. Single cylinder engine experiments are designed to explore the potential of additional late post injection strategies for pressure rise rate and peak pressure suppressing. For two mixture strengths, fuel distribution is varied between 3 gasoline injection events. In-depth combustion analysis is supported by emission measurement results. Increasing the amount of gasoline, post-injected during the main compression event, was proven to be an effective measure for reducing pressure rise rates, with over 50% reduction potential. The regulation capability however, is limited by typical tread-offs between stratified and homogenous fuelling concepts. Using post injection strategy results in decreased hydrocarbon emissions, but causes rapid increase in carbon monoxide and particulate matter emissions. Nitrous oxide increase rate is dependent on mixture strength with significantly higher sensitivities during lean operation.

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An Experimental and Modeling Study to Investigate Effects of Two-Stage Direct Injection Variations on HCCI Combustion

Cited by 15 publications

References 29 publications

HCCI combustion control using advanced gasoline direct injection techniques

HCCI combustion control using advanced gasoline direct injection techniques

Characterization of the turbulent flame front surface in spark ignition engines during spark ignition operation to identify controlled auto-ignition and abnormal combustion

Late direct fuel injection for reduced combustion rates in a gasoline controlled auto-ignition engine

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