Wyniki wyszukiwania - BazTech

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Rejestracja optyczna wyładowania iskrowego przy różnych parametrach przepływowych medium gazowego pomiędzy elektrodami świecy zapłonowej

Sosnowski M.

Prace Naukowe Akademii im. Jana Długosza w Częstochowie. Edukacja Techniczna i Informatyczna

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2009

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T. 4

235-248

EN

The paper presents the test stand dedicated to optical recording of spark discharge at different flow conditions of gaseous medium between spark plugs electrodes. It also presents the exemplary results of electric arc optical recording. The analyzed flow parameters and pressure correspond with conditions in combustion chamber of spark ignited engine at the moment of ignition. The carried out research allowed better understanding of the influence of flow parameters and pressure of gas on the course of spark discharge and subsequent flame development.

2

Investigations into the degradation mechanism of thermal barrier applied in IC engine

Hejwowski T.

Journal of KONES

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2009

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Vol. 16, No. 3

129-134

EN

In the present paper the results of investigations into the degradation mechanizm of thermal barrier coating (TBC) applied in spark ignited and naturally aspirated diesel engines are presented. The TBC comprised 0.09 mm thick NiCrAlY bond coat and 0.36 mm thick Al2O3-40%TiO2 top coat. The coating was atmospheric plasma sprayed on piston heads, inlet and outlet valves and engine head. Top coating was heavily damaged in thermal fatigue tests and in exploitation test on spark ignited engine. The mechanism of damage was spalling of the outermost layer of ceramics. Porosity of the ceramic coating increased significantly which made the coating permeable to the products of combustion and thus facilitated corrosion attack on bond layer. Spalling of coating did not increase wear of piston rings and sleeves. X-ray diffraction studies proved high phase stability ofAl2O3-40%TiO2 top coat. Al2Or40%TiO2 APS sprayed coating cannot be considered the alternative top coat to currently used ZrO2-8%Y2O3in engine applications. Thermal barrier coating based on Al2O3-40%TiO2 can not be used for adiabatization of diesel or spark ignited engines. Al2O3-40%TiO2 based TBC can be used in less demanding applications.

3

Badania porównawcze nowych konstrukcji świec zapłonowych

Hunicz J., Wac E., Kabała J.

Eksploatacja i Niezawodność

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2006

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nr 3

51-57

PL

W pracy przedstawiono wybrane wyniki badań porównawczych świec zapłonowych według opracowanej procedury. W ramach badań określono zdolność świec zapłonowych do zainicjowania spalania w ekstremalnych warunkach oraz zdolność świec zapłonowych do samooczyszczania izolatora. Analizie poddano trzy zestawy świec zapłonowych: świece standardowe z jedną elektrodą boczną, świece U-super, z rowkiem w elektrodzie bocznej oraz świece ze specjalnie zmodyfikowanym izolatorem. Na podstawie przeprowadzonych badań określono wpływ zmian konstrukcyjnych na parametry eksploatacyjne świec zapłonowych.

EN

The paper presents chosen results of spark plugs comparative research which was done according to a newly elaborated procedure. The research project covered analysis of ignition feasibility under extreme conditions and ability to burn out carbon and combustion chamber deposits from the insulator. Three types of spark plugs were examined: standard spark plug with single ground electrode, U-super with groove in a ground electrode and special design with modified shape of an insulator. Influence of proposed design modifications on working parameters was established on the grounds of the research.