Dilution limits of n-butane/air mixtures under conditions relevant to HCCI combustion

Huang, Yimin; Sung, Chih-Jen; Eng, J. A.

doi:10.1016/j.combustflame.2003.10.011

Cited by 42 publications

(19 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using a premixed air-fuel mixture and a lean burn combustion process at lower temperatures , the HCCI combustion allows to obtain a higher thermal efficiency, low NO x emissions and low particulate-matter emissions [1] (Figure 1). Contrary to diesel combustion, where turbulence during flame diffusion is of great importance or gasoline combustion with a flame front propagation, the auto-ignition phenomenon in an HCCI engine is mainly controlled by chemical kinetics.…”

Section: Used a New Combustion Process Named Hcci (Homogeneous Charmentioning

confidence: 99%

Reduced chemical reaction mechanisms: experimental and HCCI modelling investigations of autoignition processes of iso-octane in internal combustion engines

Machrafi

Lombaert

Cavadias

et al. 2005

Fuel

View full text Add to dashboard Cite

A semi-reduced (70 species, 210 reactions) and a skeletal (27 species, 29 reactions) chemical reaction mechanism for iso-octane are constructed from a semi-detailed isooctane mechanism (84 species, 412 reactions) of the Chalmers University of Technology in Sweden. The construction of the reduced mechanisms is performed by using reduction methods such as the quasi-steady-state assumption and the partial equilibrium assumption. The obtained reduced iso-octane mechanisms show, at the mentioned conditions, a perfect coherence with another more detailed iso-octane mechanism of ENSIC-CNRS (2411 reactions and 473 species) and the semi-detailed iso-octane mechanism of Chalmers. The validity of this mechanism with regard to the ignition delay is determined for several engine parameters adhering to HCCI conditions : inlet temperature (303-363 K), equivalence ratio (0.2-0.7) and compression ratio (10-16). The ignition delay is found to be decreased by an increase in the inlet temperature, H. Machrafi et al. a decrease in the equivalence ratio and an increase in the compression ratio. In order to validate the effects of the inlet temperature, compression ratio on the auto-ignition delay, experiments are performed on a CFR engine. A good agreement is obtained between experimental results and calculations.

show abstract

Section: Used a New Combustion Process Named Hcci (Homogeneous Charmentioning

confidence: 99%

Reduced chemical reaction mechanisms: experimental and HCCI modelling investigations of autoignition processes of iso-octane in internal combustion engines

Machrafi

Lombaert

Cavadias

et al. 2005

Fuel

View full text Add to dashboard Cite

show abstract

“…The narrow operating regions of LTC cycles, which are close to the flame-out limits [8][9][10] and are generally considered non-viable for continuous engine operation, have been targeted in this study. Empirical comparisons have been made between the fuel efficiencies of such LTC cycles and the conventional diesel cycles.…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency improvement strategies for a diesel engine in low-temperature combustion

Zheng

Asad

Reader

et al. 2009

Int. J. Energy Res.

View full text Add to dashboard Cite

SUMMARYThe lowered combustion temperature in diesel engines is capable of reducing nitrogen oxides and soot simultaneously, which can be implemented by the heavy use of exhaust gas recirculation (EGR) or the homogeneous charge compression ignition (HCCI) type of combustion. However, the fuel efficiency of the low-temperature combustion (LTC) cycles is commonly compromised by the high levels of hydrocarbon and carbon monoxide emissions. More seriously, the scheduling of fuel delivery in HCCI engines has lesser leverage on the exact timing of auto-ignition that may even occur before the compression stroke is completed, which may cause excessive efficiency reduction and combustion roughness. New LTC control strategies have been explored experimentally to achieve ultralow emissions under independently controlled EGR, intake boost, exhaust backpressure, and multi-event fuel-injection events. Empirical comparisons have been made between the fuel efficiencies of LTC and conventional diesel cycles. Preliminary adaptive control strategies based on cylinder pressure characteristics have been implemented to enable and stabilize the LTC when heavy EGR is applied. The impact of heat-release phasing, duration, shaping, and splitting on the thermal efficiency has also been analyzed with engine cycle simulations. This research intends to identify the major parameters that affect diesel LTC engine thermal efficiency.

show abstract

“…Concerning the emission reduction during the combustion process, HCCI Homogeneous Charged Compression Ignition) appears to be a good solution to respect the future Euro norms (Table 1). Using a lean burn combustion process at lower temperatures and a premixed air-fuel mixture, the HCCI combustion allows for a higher thermal efficiency, less NOx emissions and less particulate-matter emissions [1]. Whereas diesel combustion is mainly controlled by turbulence during flame diffusion and gasoline combustion with a flame front propagation, the auto-ignition phenomenon in an HCCI engine is mainly controlled by chemical kinetics and its combustion progression is much more complicated.…”

Section: Introductionmentioning

confidence: 99%

Reduced Chemical Reaction Mechanisms: Experimental and HCCI Modelling Investigations of Autoignition Processes of n-Heptane in Internal Combustion Engines

Machrafi¹,

Lombaert²,

Cavadias³

et al. 2005

SAE Technical Paper Series

View full text Add to dashboard Cite

Dilution limits of n-butane/air mixtures under conditions relevant to HCCI combustion

Cited by 42 publications

References 16 publications

Reduced chemical reaction mechanisms: experimental and HCCI modelling investigations of autoignition processes of iso-octane in internal combustion engines

Reduced chemical reaction mechanisms: experimental and HCCI modelling investigations of autoignition processes of iso-octane in internal combustion engines

Energy efficiency improvement strategies for a diesel engine in low-temperature combustion

Reduced Chemical Reaction Mechanisms: Experimental and HCCI Modelling Investigations of Autoignition Processes of n-Heptane in Internal Combustion Engines

Contact Info

Product

Resources

About