HCCI in a CFR Engine: Experiments and Detailed Kinetic Modeling

Flowers, Daniel L.; Aceves, Salvador M.; Smith, Rachelle M.; Torres, John; Girard, James W.; Dibble, Robert W.

doi:10.4271/2000-01-0328

Cited by 79 publications

(32 citation statements)

References 18 publications

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“…A higher equivalence ratio provides for more fuel to burn and more energy to be released. This is also observed by many others [3,28,29]. The completeness of the combustion is also influenced by the equivalence ratio as is found by Shiga et al [30], investigating compressed-natural-gas direct-injection stratified combustion in a rapid compression machine.…”

Section: The Effect Of the Equivalence Ratio On The Auto-ignition Prosupporting

confidence: 55%

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

Machrafi

Cavadiasa

2008

Fuel Processing Technology

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In order to understand better the auto-ignition process in an HCCI engine, the influence of some important parameters on the auto-ignition is investigated. The inlet temperature, the equivalence ratio and the compression ratio were varied and their influence on the pressure, the heat release and the ignition delays were measured. The inlet temperature was changed from 25 to 70 °C and the equivalence ratio from 0.18 to 0.41, while the compression ratio varied from 6 to 13.5. The fuels that were investigated were PRF40 and n-heptane. These three parameters appeared to decrease the ignition delays, with the inlet temperature having the least influence and the compression ratio the most. A previously experimentally validated reduced surrogate mechanism, for mixtures of n-heptane, iso-octane and toluene, has been used to explain observations of the auto-ignition process. The same kinetic mechanism is used to better understand the underlying chemical and physical phenomena that make the influence of a certain parameter change according to the operating conditions. This can be useful for the control of the auto-ignition process in an HCCI engine.

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Section: The Effect Of the Equivalence Ratio On The Auto-ignition Prosupporting

confidence: 55%

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

Machrafi

Cavadiasa

2008

Fuel Processing Technology

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“…contrast with some experimental results in the literature like the work of Flowers et al [26], where an increase in the equivalence ratio resulted into a decrease in the ignition delay. Aichlmayr et al also observed this contradiction in their work [27].…”

Section: Effects Of the Equivalence Ratio On Auto-ignition Delaycontrasting

confidence: 53%

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

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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.

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“…An engine performance map was developed based on the CFR experiments. An analysis of the experimental conditions was conducted, and very good agreement was obtained between the experimental and numerical results [9].…”

Section: Hcci Experimentsmentioning

confidence: 99%

HCCI Combustion: Analysis and Experiments

Aceves¹,

Flowers²,

Martínez-Frías³

et al. 2001

SAE Technical Paper Series

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Homogeneous charge compression ignition (HCCI) is a new combustion technology that may develop as an alternative to diesel engines with high efficiency and low NO x and particulate matter emissions. This paper describes the HCCI research activities being currently pursued at Lawrence Livermore National Laboratory and at the University of California Berkeley. Current activities include analysis as well as experimental work.On analysis, we have developed two powerful tools: a single zone model and a multi-zone model. The single zone model has proven very successful in predicting start of combustion and providing reasonable estimates for peak cylinder pressure, indicated efficiency and NO X emissions. This model is being applied to develop detailed engine performance maps and control strategies, and to analyze the problem of engine startability. The multi-zone model is capable of very accurate predictions of the combustion process, including HC and CO emissions. The multi-zone model has applicability to the optimization of combustion chamber geometry and operating conditions to achieve controlled combustion at high efficiency and low emissions.On experimental work, we have done a thorough evaluation of operating conditions in a 4-cylinder Volkswagen TDI engine. The engine has been operated over a wide range of conditions by adjusting the intake temperature and the fuel flow rate. Satisfactory operation has been obtained over a wide range of operating conditions. Cylinder-to-cylinder variations play an important role in limiting maximum power, and should be controlled to achieve satisfactory performance.

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HCCI in a CFR Engine: Experiments and Detailed Kinetic Modeling

Cited by 79 publications

References 18 publications

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

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

HCCI Combustion: Analysis and Experiments

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