Yazar "Stanley, M. Jerome" seçeneğine göre listele

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    Evaluating the potential performance of methane in lean conditions and examining the variations in combustion in a gasoline direct injection engine
    (Pergamon elsevier science LTD, 2024) Stanley, M. Jerome; Varuvel, Edwin Geo; Martin, M. Leenus Jesu
    The present work investigates the effect of methane addition on a direct injection spark-ignition engine's performance, combustion, cycle-to-cycle variation, coefficient of variation, and emission characteristics. Equivalence ratio of the engine is varied from lambda = 1.0, 1.02, 1.08, 1.15, and 1.22. Methane addition for the equivalence ratios (lambda = 1.0, 1.02, and 1.08) close to the stoichiometric condition does not support the methane addition. Decrease in peak pressure is seen in minimum to the maximum methane addition of 19.5 %. Adding the gaseous fuel to the intake manifold causes charge displacement, as the fuel is inducted at the suction top dead center. This effect is consistent with the increase in flame initiation and combustion durations. The same methane addition fraction for the equivalence ratios of lambda = 1.15 and 1.22 provides better combustion stability and efficiency. The peak pressure attainment for lambda = 1.22 is a 25 % increment with the maximum methane addition. Emission formation of carbon monoxide and unburnt hydrocarbons drops as the fuel is leaner towards lambda = 1.22, even with the addition of methane. The oxides of nitrogen emissions decrease initially for the equivalence ratio close to the stoichiometric condition but increase for the leaner equivalence ratio with the methane addition fraction.
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    Quantitative assessment of small-bore gasoline direct injection engine for homogenous stoichiometric lean condition with hydrogen addition in dual fuel mode
    (Pergamon-Elsevier Science Ltd, 2024) Stanley, M. Jerome; Varuvel, Edwin Geo; Martin, M. Leenus Jesu
    The global hunt for the sustainable fuel for the energy and transportation has reached the newer dimensions. The advancement in the engine technology makes the viable solution to fit the hydrogen as the working fuel for both CI and SI engines. The physio-chemical chemical properties of hydrogen have the apt fitment for the SI engine. With the advancement in the automotive electronics and precision control of the fuel handling system makes hydrogen a workable option for the replacement for the conventional fuels. In this research hydrogen was inducted into the intake manifold and Gasoline is injected directly into the cylinder of the small-bore Gasoline Direct Injection (GDI) Engine at wide open throttle condition. The intake manifold is slightly modified to accommodate the hydrogen induction system (0-8 Litres Per Minute), where premixed mixture of hydrogen and air is formed in the intake manifold; the equivalence ratio of 1.0, 1.02 and 1.08 was set for the given hydrogen induction. The engine conditions were set as 3000 rpm with five hydrogen addition fractions of 0 %, 1.5 %, 2.8 %, 4.2 % and 5.8 % respectively. The hydrogen induction improves the combustion rate and mean effective pressure; shorten the flame propagation, maximize the heat release rate and peak pressure attainment. Maximum of 16 % increase in the peak pressure is attained for the lambda = 1 for the 5.8 % hydrogen addition fraction. On the emission side, consistent decrease in CO and HC emission; and increase of NO emission, since the mean gas temperature has increased.