Effects of Injection Timing on the Conditions at Top Dead Center for Direct Injected HCCI

Strålin, Per; Wåhlin, Fredrik; Ångström, Hans-Erik

doi:10.4271/2003-01-3219

Cited by 8 publications

(2 citation statements)

References 12 publications

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“…Numerical models by Strålin et al showed that fuel stratification caused by injection of fuel around TDC results in pockets of rich fuel and air mixture, which promotes ignitability. Overall fuel stratification extended the combustion duration helping to avoid knock, thus extending the operating range of the engine [105]. Helmantel and Denbratt used multiple injection scheme of n-heptane to allow for sufficient mixing to operate a conventional diesel common passenger rail car engine with HCCI combustion [106].…”

Section: Direct Injection For Hcci Controlmentioning

confidence: 99%

Homogeneous Charge Compression Ignition Combustion: Challenges and Proposed Solutions

Najafabadi

Aziz

2013

Journal of Combustion

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Engine and car manufacturers are experiencing the demand concerning fuel efficiency and low emissions from both consumers and governments. Homogeneous charge compression ignition (HCCI) is an alternative combustion technology that is cleaner and more efficient than the other types of combustion. Although the thermal efficiency andNOxemission of HCCI engine are greater in comparison with traditional engines, HCCI combustion has several main difficulties such as controlling of ignition timing, limited power output, and weak cold-start capability. In this study a literature review on HCCI engine has been performed and HCCI challenges and proposed solutions have been investigated from the point view ofIgnition Timingthat is the main problem of this engine. HCCI challenges are investigated by many IC engine researchers during the last decade, but practical solutions have not been presented for a fully HCCI engine. Some of the solutions are slow response time and some of them are technically difficult to implement. So it seems that fully HCCI engine needs more investigation to meet its mass-production and the future research and application should be considered as part of an effort to achieve low-temperature combustion in a wide range of operating conditions in an IC engine.

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Section: Direct Injection For Hcci Controlmentioning

confidence: 99%

Homogeneous Charge Compression Ignition Combustion: Challenges and Proposed Solutions

Najafabadi

Aziz

2013

Journal of Combustion

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“…Others are using n-hexadecane (or cetane, C 16 H 34 ) or n-dodecane (C 12 H 26 ) in order to obtain a high density ratio, similar to diesel engine sprays [2]. Stralin and Wahlin [3] use n-dodecane for its high boiling temperature characteristics, comparable to diesel.…”

Section: Diesel Surrogatesmentioning

confidence: 99%

Influence of Diesel Surrogates on the Behavior of Simplified Spray Models

Galle

Verhelst

2012

Lecture Notes in Electrical Engineering

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Numerous experimental investigations make use of diesel surrogates to make the computational time reasonable. In the few studies where measured (surrogate and real diesel) and computed (surrogate only) results have been compared, the selection methodology for the surrogate constituent compounds and the measures taken to validate the chemical kinetic models are not discussed, and the range of operating conditions used is often small. Additionally, most simplified models use tuning variables to fit model results to measurements. This work makes the comparison between some frequently used diesel surrogates using a simple 1D vaporizing spray model, with the spray cone angle as the tuning parameter. Results show that liquid length and fuel fraction strongly depend on the physical properties of the used fuel for a fixed spray angle. These parameters are important for modeling auto-ignition and pollutant formation. The spray angle is varied till the spray length is the same for each surrogate. Results show important differences between other spray parameters such as local mixture fraction and axial velocity.

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In-cylinder Flow with Negative Valve Overlapping - Characterised by PIV Measurement

Wilson¹,

Haste²,

Xu³

et al. 2005

SAE Technical Paper Series

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Effects of Injection Timing on the Conditions at Top Dead Center for Direct Injected HCCI

Cited by 8 publications

References 12 publications

Homogeneous Charge Compression Ignition Combustion: Challenges and Proposed Solutions

Homogeneous Charge Compression Ignition Combustion: Challenges and Proposed Solutions

Influence of Diesel Surrogates on the Behavior of Simplified Spray Models

In-cylinder Flow with Negative Valve Overlapping - Characterised by PIV Measurement

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