Wyniki wyszukiwania - BazTech

1

Preliminary investigations of the HCCI combustion system in a rapid compression machine

Motyl K., Klimkiewicz D., Rychter T. J.

Journal of KONES

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2004

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Vol. 11, No. 3-4

83-89

EN

The preliminary results of the investigations of the HCCI engine combustion system are presented. The stu di e s were performed with the use ofthe Rapid Compression Machine converted for HCCI requirements. The instrumentation and the research procedure are also introduced. The influence of the methane-air mixture initial temperature and the stoichiometry of the mixture on a coiuhustion process were studied in order to establish its impact on selfignition. The results of the perfomed studies have confirmed that two aforementioned parameters have considerable significance for the whole process and that the effect of initial temperature is almost entirely diminishing in its higher values.

2

Ignition and mixing - key feature at late methane injection in IC engines

Klimkiewicz D., Rychter T. J.

Journal of KONES

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2003

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Vol. 10, No. 1-2

91-98

EN

The study of the engine combustion system with the direct injection of the methane fuel is introduced. Very short time available for the injection and poor penetration and mixing of the gas jet with the surrounding air cause the serious problems with the combustion initiation. The preliminary results of studies of the ignition of the gaseous fuel jet in single compression machine with the special ignition chamber are presented. The ignition takes place within the prechamber and the hot, chemically active combustion gases saturate the methane fuel jet, which enters the main chamber where the mixing and combustion processes are continued. The results of the investigations aiming at obtaining of the efficient and repetitive ignition of the methane fuel jet are presented. The various versions of the combustion chamber were investigated. The investigations were supported by the results of the numerical calculations of the injection and mixing processes. It has been concluded that that type of the combustion system has the potential to obviate the difficulties to obtain the repetitive ignition of the methane fuel jet.

3

HCCI engine – a preliminary analysis

Motyl K., Rychter T. J.

Journal of KONES

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2003

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Vol. 10, No. 3-4

217-225

EN

This paper briefly describes history of origin, worldwide research work results, advantages and problems following from specific combustion process, typical for HCCI engines which is so different from well known and widely used spark and diesel engines. More than twenty years left since the HCCI concept was first proposed and demonstrated and steady progress has been made in developing the technology. Previous and current research works in the world have indicated that engine working in HCCI mode can be supplied by means of different fuels at extremely low emissions and high efficiencies. All world observations have been included and described in current work.

4

Inertia-driven single compression machine for combustion study.

Rychter T.J., Lezanski T.

Archive of Mechanical Engineering

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2002

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Vol. XLIX, nr 4

341-353

EN

The paper presents the original design of the single compression machine for combustion study. The pronciple of operation is based on old concept, utilizing the inertia energy of a flywheel to accelerate the crank mechanism and the attached piston to compress rapidly the combustible mixture in the combustion chamber. A square piston geometry was adopted to allow visualization of the compression and combustion processes in directions perpendicular to the cylinder axis. To avoid the extensive scratching of glass walls by the moving piston, a special multi-action clutch-brake unit was used, this facilitates coupling of the flywheel with the crank mechanism during the single piston stroke and subsequent immediate uncoupling and fast stopping of the piston. The whole operating cycle can be complited within no more than two revolutions of the crankshaft. The design details of the machine, its accelaration characteristics and a sample of the visualized combustion process are presented.

PL

W artykule przedstawiono oryginalne rozwiązanie konstrukcyjne maszyny pojedynczego sprzężu przeznaczonej do badań procesów spalania. Zasada działania maszyny jest konwencjonalna, natomiast do jej napędu wykorzystano bezwładność koła zamachowego, którego energia umożliwia szybkie przyspieszenie mechanizmu korbowego, niezbędne do sprężenia mieszanki palnej w komorze spalania. Użyto cylindra i tłoka o prostokątnym przekroju dla umożliwienia wizualizacji procesu spalania w kierunku prostopadłym do osi cylindra. Dla uniknięcia rysowania szkieł zamykających ściany cylindra zastosowano specjalne sprzęgło połączone z hamulcem, które umożliwia szybkie sprzęgnięcie koła zamachowego z mechanizmem korbowym, a następnie ich rozłączenie i zahamowanie wału korbowego. Cały cykl operacyjny maszyny zamyka się podczas dwóch obrotów wału. Przedstawiono szczegóły konstrukcyjne maszyny i charakterystykę przyspieszania tłoka, a także zaprezentowano przykład wizualizacji procesu spalania.