Engine speed and air-fuel ratio effect on the combustion of methane augmented hydrogen rich syngas in DI SI engine

Hagos, F.Y. and A. Aziz, A.R. and Sulaiman, S.A. and Mamat, R. (2018) Engine speed and air-fuel ratio effect on the combustion of methane augmented hydrogen rich syngas in DI SI engine. International Journal of Hydrogen Energy .

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The main challenge on the fueling of pure hydrogen in the automotive vehicles is the limitation in the hydrogen separation from the product of steam reforming and gasification plants and the storage issues. On the other hand, hydrogen fueling in automotive engines has resulted in uncontrolled combustion. These are some of the factors which motivated for the fueling of raw syngas instead of further chemical or physical processes. However, fueling of syngas alone in the combustion chamber has resulted in decreased power output and increased in brake specific fuel consumption. Methane augmented hydrogen rich syngas was investigated experimentally to observe the behavior of the combustion with the variation of the fuel-air mixture and engine speed of a direct-injection spark-ignition (DI SI) engine. The molar ratio of the high hydrogen syngas is 50 H2 and 50 CO composition. The amount of methane used for augmentation was 20 (V/V). The compression ratio of 14:1 gas engine operating at full throttle position (the throttle is fully opened) with the start of the injection selected to simulate the partial DI (180° before top dead center (BTDC)). The relative air-fuel ratio (λ) was set at lean mixture condition and the engine speed ranging from 1500 to 2400 revolutions per minute (rpm) with an interval of 300 rpm. The result indicated that coefficient of variation of the indicate mean effective pressure (COV of IMEP) was observed to increase with an increase with λ in all speeds. The durations of the flame development and rapid burning stages of the combustion has increased with an increase in λ. Besides, all the combustion durations are shown to be more sensitive to λ at the lowest speed as compared to the two engine speeds. © 2018 Hydrogen Energy Publications LLC

Item Type:Article
Impact Factor:cited By 0; Article in Press
Uncontrolled Keywords:Combustion; Combustion chambers; Compression ratio (machinery); Direct injection; Engines; Fuel consumption; Fueling; Fuels; Hydrogen storage; Ignition; Methane; Mixtures; Steam reforming; Synthesis gas, Air fuel ratios; Brake specific fuel consumption; Coefficient of variation; Direct-injection spark ignitions; Engine speed; Mean effective pressure; Revolutions per minutes; Syn-gas, Speed
Departments / MOR / COE:Research Institutes > Energy
ID Code:21929
Deposited By: Mr Ahmad Suhairi
Deposited On:01 Aug 2018 01:12
Last Modified:16 Nov 2018 08:59

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