Wyniki wyszukiwania - BazTech

1

Flame propagation in a narrow gap between the piston and cylinder of a hydrogen engine

Kavtaradze Revaz, Natriashvili Tamaz, Glonti Merab, Chilasvili Giorgi, Gelashvili Otar, Iosebidze Jumber

Transport Problems

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2023

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T. 18, z. 3

189--197

EN

The processes of flame penetration and propagation in a narrow annular gap between the piston and cylinder of a hydrogen piston engine are investigated by the method of 3D mathematical modeling. The model is verified by comparing the changes in pressure and heat release rate in the cylinder obtained from an experimental hydrogen engine, considering the data collected during numerical experiments. The movement of the flame front into the gap is analyzed by changes in the instantaneous local values of the hydrogen fractions in the mixture and the local temperatures of the cold gas (unburned mixture) and combustion products. A comparative analysis of the spread of gasoline and hydrogen flames is carried out. The phenomenon of increasing heat losses in the combustion chamber of a hydrogen engine compared to a gasoline engine, previously confirmed experimentally by different authors and not yet having an acceptable theoretical interpretation, is explained by neglecting the role of heat transfer in the indicated gap.

2

Numerical investigation on the effects of fueling the Turbulent Jet Ignition gas engine with methane and hydrogen

Pielecha Ireneusz, Szwajca Filip, Skobiej Kinga

Pojazdy Szynowe

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2023

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Nr 1-2

46--57

EN

The modern solution of two-stage combustion, namely the Turbulent Jet Ignition (TJI), enables the combustion of ultra-lean mixtures. Thanks to this solution, it became possible to reduce fuel consumption and, at the same time, to increase the combustion process indicators (including the overall combustion system efficiency). The article presents the results of numerical tests of a heavy-duty engine equipped with the TJI system running on gas fuels. The AVL BOOST software was used to analyze the effects of different fuel injection rates into the pre-chamber and various ignition timing angles, while maintaining a constant global excess air ratio. Increasing the proportion of hydrogen in the prechamber resulted in its reduction in the main chamber (the fuel dose was kept constant with different excess air coefficients in each of the chambers). The maximum combustion pressure values in both chambers were investigated. Changes in the amount of heat released and its release rate were determined. As a result of the simulations, different ignition and combustion conditions were presented for the tested fuels. Based on this, maps of fuel dose to prechamber vs. ignition advance angle were drawn up, showing selected thermodynamic indicators of the combustion process.

3

Ocena możliwości zastosowania gazu Browna do współzasilania silnika o zapłonie samoczynnym

Woźniak G., Longwic R., Górski K.

Autobusy : technika, eksploatacja, systemy transportowe

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2017

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R. 18, nr 6

474--478, CD

PL

Zmniejszenie zanieczyszczeń wynikających ze spalania paliw w środkach transportu jest obecnie wymogiem prawnym w skali globalnej. Gaz Browna jest gazem należącym do alternatywnych źródeł czystej energii, przegląd literatury pokazuje, że mieszanina tego gazu wraz z powietrzem zasilającym silnik, pozwala zwiększyć wydajność spalania i ograniczyć wskaźniki emisji. W artykule przeprowadzona została synteza wiedzy w zakresie zastosowanie gazu Browna jako dodatku do powietrza zasilającego silnik. Omówione zostały główne informacje dotyczące wykorzystania wodoru jako paliwa, a także wskazano dotychczasowe sposoby wykorzystania generatora wodorowego.

EN

Pollution reduction resulting from the emission of fuel combustion is becoming more and more popular all over the world. Brown’s gas is an alternative source of clean energy, the literature review shows that a mixture of this gas and fuel enables to improve efficiency of combustion and reduce emission factors, and only water, which is widely available renewable resource, is necessary for its production. The synthesis of knowledge within the scope of using Brown’s gas as fuel additive was conducted in this article. The main information concerning the use of hydrogen as fuel and the use of hydrogen generator were discussed.

4

„Gaz Browna – HHO” jako dodatek do paliw zasilających silniki spalinowe

Skrzyniowski A.

Czasopismo Techniczne. Mechanika

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2012

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R. 109, z. 5-M

281--290

PL

Oszczędność energii i paliwa w pojazdach samochodowych to odwieczny problem właścicieli pojazdów samochodowych. W dobie wyczerpywania się zasobów paliwa (kryzys paliwowy), wzrostu cen, a także ochrony środowiska poszukuje się nowych źródeł energii, tanich i jednocześnie nie niszczących środowiska. Jedną z możliwości w przypadku pojazdów samochodowych od niedawna jest wykorzystanie tzw. gazu Browna do wspomagania pracy silnika spalinowego. W przedstawionym artykule przytoczono badania, jakie przeprowadzono w Instytucie Pojazdów Samochodowych i Silników Spalinowych PK z wykorzystaniem hamowni podwoziowej i porównano moc oraz moment obrotowy silnika na paliwie konwencjonalnym oraz wspomaganym gazem HHO.

EN

Saving energy and fuel in automobile is immemorial problem of automobiles’ owners. In age of depletion of fuel resources (fuel crisis), increase of prices and environmental protection it is looked for new energy sources, cheep and protecting environment. One of possibilities in automobiles is Brown’s gas for furtherance internal-combustion engine. This article presents researching on chassis dynamometer and comparison power and torque of engine with conventional fuel and with HHO gas.

5

Development project of a hydrogen fuelled internal combustion engine for heavy duty truck - outline and preliminary test

Sato Y., Yanai T., Goto Y.

Journal of KONES

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2007

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Vol. 14, No. 3

543-549

EN

The hydrogen fuelled internal combustion engine represent a promising solution to the issues of global warming, fossil fuel break point and environmental protection. The development of a hydrogen fuelled internal combustion engine for heavy-duty truck has been being carried out at Hydrogen Energy Research Centre (HERC) of Musashi Institute of Technology and National Traffic Safety and Environment Laboratory (NTSEL) since FY 2005 in the Next-Generation, Low-Emission Vehicle Development - Practical Implementation Project (EFV21) of Ministry of Land, Infrastructure and Transport (MLIT). As the most important key technology, the development of the common-rail type electronic high pressure hydrogen injectors is performed. Now the development of a hydrogen fuelled engine with 6 cylinders, the total displacement of 7.7 litters, direct injection and spark ignition is about to start. In this paper, the development concept, the characteristics of the injectors, some performance in the engine output power and the effects of nox reduction catalyst ever obtained experimentally by using a single cylinder engine are demonstrated.