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Thermodynamic analysis of combustion events in the natural gas fuelled SI engine with VVT

Szwaja M., Mazuro P., Szwaja S.

Journal of KONES

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2018

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Vol. 25, No. 4

421--427

EN

The main aim of the research was to investigate influence of overlap of the natural gas fuelled spark ignited engine on the following parameters: Indicated Mean Effective Pressure (IMEP), heat rate release including combustion phases (ignition lag, main combustion phase). The content of the study includes results from processing in-cylinder pressure measurements, heat release rate analysis, combustion phases, and finally the conclusions. The tests were carried out on the test bed including the single cylinder research engine with a displacement volume of 550 cm3. The engine was equipped with independent cam phasors for both intake and exhaust valves, but for this investigation, the exhaust valve timing was fixed (the exhaust cam centre line was fixed at -95 crank angle (CA) deg before Top Dead Centre) and intake valve timing was changed (the intake cam centre line was varied from 90 to 150 CA deg after Top Dead Centre). The overlap was changed in the range from 85 to 25 CA deg. 8 tests series were performed, each singular series consisted of 300 consecutive engine combustion cycles. As observed, by varying the valve overlap it contributes to significant change in the peak combustion pressure, peak of heat release rate, and combustion phases. Summing up, variable valve timing affects compression and expansion strokes by changing polytropic indexes due to various amounts of exhaust residuals trapped in the cylinder. It affects not only engine volumetric efficiency but also the heat release rate and IMEP, so it does engine performance. Thus, variable valve timing can be considered as valuable tool that can be applied to the natural gas fuelled internal combustion engine.

2

System rejestracji i analizy wykresu indykatorowego w czasie rzeczywistym

Gruca M.

Autobusy : technika, eksploatacja, systemy transportowe

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2017

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R. 18, nr 12

897--900, CD

PL

W artykule przedstawiono opis systemu rejestracji i analizy w czasie rzeczywistym wykresu indykatorowego tłokowego silnika spalinowego. Oprócz prezentowania wykresu indykatorowego w czasie rzeczywistym, system prezentuje również w czasie rzeczywistym wykresy: szybkości zmian ciśnienia, temperatury, szybkości wydzielania ciepła oraz zmian prędkości, pracy i mocy indykowanej w kolejnych cyklach pracy silnika.

EN

The article presents a description of the real-time recording and analysis system for cylinder pressure diagram of the piston internal combustion engine Moreover, the system can additionally present in real time the following diagrams: rate of cylinder pressure rise, temperature, heat release rate and changes of engine speed, IMEP, indicated power in subsequent engine cycles.

3

Metrologia w chemii. "Wykazanie" a "uznanie" kompetencji pomiarowych : niezbędna korelacja pomiędzy metrologią a akredytacją

Bièvre P. de, Taylor P. D. P., Bulska E.

Analityka : nauka i praktyka

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2002

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nr 1

36--42