Experimental study on the effects of methane-hydrogen jet as direct injected fuel in marine diesel engine

Abdelhameed, Elsayed; Tashima, Hiroshi

doi:10.1016/j.energy.2022.126569

Cited by 13 publications

(4 citation statements)

References 34 publications

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Section: Discussionsupporting

confidence: 89%

“…A certain degree of uncertainty should be accounted for because no experimental data are available in the operative conditions adopted and the model could overestimate such values. However, the trends seem in accordance with the outcomes from literature [31], demonstrating that NOx can increase by 76%, going from 0 to 100% hydrogen content in the mixture. The observation of distributions inside the cylinder of diesel vapor and its equivalence ratio allows to understand the trend of the heat release rate that rises from diesel auto-ignition in the most reactive mixtures and propagates to the surrounding areas.…”

Section: Discussionsupporting

confidence: 89%

“…A certain degree of uncertainty should be accounted for because no experimental data are available in the operative conditions adopted and the model could overestimate such values. However, the trends seem in accordance with the outcomes from literature [31], demonstrating that NOx can increase by 76%, going from 0 to 100% hydrogen content in the mixture. A certain degree of uncertainty should be accounted for because no experimental data are available in the operative conditions adopted and the model could overestimate such values.…”

Section: Discussionsupporting

confidence: 89%

“…Consequently, some research attempts are directing their efforts towards the study of diesel and hydrogen combustion in marine engines for dual fuel applications. In order to avoid knocking and abnormal combustion events, Abdelhameed and Tashima [31] evaluated the performance of methane-hydrogen blends as the primary fuel in a marine diesel engine. Since the mixture of hydrogen and methane was directly injected, they also tested different injection pressures.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Dual Fuel Combustion in a Medium Speed Marine Engine Supplied with Methane/Hydrogen Blends

Cameretti,

De Robbio,

Palomba

2023

Energies

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Compression ignition engines will still be predominant in the naval sector: their high efficiency, high torque, and heavy weight perfectly suit the demands and architecture of ships. Nevertheless, recent emission legislations impose limitations to the pollutant emissions levels in this sector as well. In addition to post-treatment systems, it is necessary to reduce some pollutant species, and, therefore, the study of combustion strategies and new fuels can represent valid paths for limiting environmental harmful emissions such as CO2. The use of methane in dual fuel mode has already been implemented on existent vessels, but the progressive decarbonization will lead to the utilization of carbon-neutral or carbon-free fuels such as, in the last case, hydrogen. Thanks to its high reactivity nature, it can be helpful in the reduction of exhaust CH4. On the contrary, together with the high temperatures achieved by its oxidation, hydrogen could cause uncontrolled ignition of the premixed charge and high emissions of NOx. As a matter of fact, a source of ignition is still necessary to have better control on the whole combustion development. To this end, an optimal and specific injection strategy can help to overcome all the before-mentioned issues. In this study, three-dimensional numerical simulations have been performed with the ANSYS Forte® software (version 19.2) in an 8.8 L dual fuel engine cylinder supplied with methane, hydrogen, or hydrogen–methane blends with reference to experimental tests from the literature. A new kinetic mechanism has been used for the description of diesel fuel surrogate oxidation with a set of reactions specifically addressed for the low temperatures together with the GRIMECH 3.0 for CH4 and H2. This kinetics scheme allowed for the adequate reproduction of the ignition timing for the various mixtures used. Preliminary calculations with a one-dimensional commercial code were performed to retrieve the initial conditions of CFD calculations in the cylinder. The used approach demonstrated to be quite a reliable tool to predict the performance of a marine engine working under dual fuel mode with hydrogen-based blends at medium load. As a result, the system modelling shows that using hydrogen as fuel in the engine can achieve the same performance as diesel/natural gas, but when hydrogen totally replaces methane, CO2 is decreased up to 54% at the expense of the increase of about 76% of NOx emissions.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionsupporting

confidence: 89%

“…A certain degree of uncertainty should be accounted for because no experimental data are available in the operative conditions adopted and the model could overestimate such values. However, the trends seem in accordance with the outcomes from literature [31], demonstrating that NOx can increase by 76%, going from 0 to 100% hydrogen content in the mixture. A certain degree of uncertainty should be accounted for because no experimental data are available in the operative conditions adopted and the model could overestimate such values.…”

Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations