Wyniki wyszukiwania - Biblioteka Nauki

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Experimental study of the direct methane injection and combustion in SI engine

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Klimkiewicz D. , Teodorczyk A.

Journal of KONES

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2006

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tom Vol. 13, No. 2

205-211

EN

This paper reports on experimental study performed in a single cylinder SI research engine with the direct injection of methane to the cylinder. The methane injection was performed during compression stroke just before TDC – at the similar period as fuel injection occurs in Diesel engines. One of the main goals for direct injection of methane to the cylinder is the improvement of volumetric efficiency of the engine in comparison with standard method of gas mixture formation with the mixer. Direct methane injection creates many problems with proper mixing. The time available for mixing of the injected gas with the air is very short and the gaseous jet penetration in the combustion chamber volume and its ignition and mixing with the air is weak. During the study several design parameters, such as, position of ignition, direction of methane jet, douse piloting, were tested on their influence on ignition and combustion process. The high pressure injector was used for methane injection with the pressure of injection equal to 10 MPa. As a result of the experimental investigations a number of pressure profiles and the corresponding series of the frame schlieren pictures of the injection and combustion processes were obtained.

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

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Klimkiewicz D. , Rychter T. J.

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tom 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.

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Wpływ analizatorów spalin na wyniki emisji oraz analiza możliwości zwiększenia dokładności pomiarów emisji gazowych związków szkodliwych spalin przez zastosowanie nowoczesnych analizatorów pod kątem badania samochodów o bardzo niskiej emisji

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Bielaczyc P. , Szczotka A. , Klimkiewicz D.

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tom R. 22, nr 12

131--137, CD

PL

Badania emisji związków szkodliwych spalin w testach na hamowni podwoziowej są jednymi z najważniejszych i najbardziej skomplikowanych badań, jakim są poddawane samochody napędzane silnikami spalinowymi. Z uwagi na coraz niższą emisję nowo produkowanych samochodów bardzo ważne jest stosowanie coraz to nowocześniejszych urządzeń do pomiarów emisji, w tym również odpowiednich analizatorów spalin. Tematem niniejszego artykułu jest analiza wpływu analizatorów spalin na wyniki pomiarów emisji gazowych związków szkodliwych spalin oraz analiza możliwości zwiększenia dokładności pomiarów emisji przez zastosowanie nowoczesnych analizatorów spalin. W artykule omówiono również metodykę pomiarów emisji gazowych związków szkodliwych spalin, podlegających limitom.

EN

Exhaust emission measurements on the chassis dynamometer are one of the most important and most complex tests which are performed on vehicles driven by combustion engines. It is very important to use more and more advanced and modern equipment for emission measurements, including suitable analyzers, due to the decreasing exhaust emission of newly produced vehicles. The subject of this paper is an analysis of the influence of analyzers on the emission results and an analysis of the possibility of an increase in the accuracy of the emission measurements by using modern analyzers. The paper also describes the methodology of meas-urements of regulated gaseous pollutants.

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Budowa geologiczna doliny Białego Dunajca

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Mastella L. , Ludwiniak M. , Klimkiewicz D.

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tom Vol. 60, nr 9

496--505

PL

The Biały Dunajec Valley is one of the large, meridionally oriented valleys cutting the Podhale Synclinorium. The tectonic origin of this valley has been suggested since the beginning of the 20th century. A large fault zone with an azimuth of about 20° has been recognized here. This zone extends to the north and cuts the Pieniny Klippen Belt, which is significantly lowered in its eastern side. The southern part of the Biały Dunajec fault zone (SBD) extends probably into the Tatra Massif (into the Mała Łąka Valley area and far to the south into the border of the Koszysta elevation and the Goryczkowa depression). The majority of faults constituting the SBD were formed during the initial phase as strike-slip faults; they were reactivated later as dip-slip faults with a prevailing dip-slip, mainly normal component. As a whole, the SBD is a scissor-like fault: in the northern part, near the Szaflary village, downfaulted is its eastern block, whereas in the southern part - its western block.