Experimental investigation of CH4 - H2 blends combustion in HCCI engine under enriched oxygen conditions
(2024) International Symposium on combustion — Location: milan
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- Abstract
- The scientific community is exploring diverse avenues for renewable energy production, storage, and usage due to the imperative of transitioning towards renewable energy sources. Internal combustion engines are a popular choice for converting stored energy, especially in the context of e-fuels, due to their well-established infrastructure. Homogeneous Charge Compression Ignition (HCCI) engines are particularly attractive in this regard due to their high thermal efficiency and low NOx emissions. However, two main challenges hinder their widespread adoption: limited control over ignition timing and low power density. The former constraint arises from combustion kinetics, while the other is due to the necessary high intake temperatures for combustion and the limited equivalence ratio. Several techniques have been investigated to overcome these limitations for example blending fuels with different properties or oxy-fuel combustion. Mixing hydrogen with methane enables better engine performances with reduced knock intensity [1]. Increasing the oxygen fraction in the oxidiser enhances the mixture reactivity allowing a decrease in the intake temperature and, hence, an increase in the density of the mixture [2]. However, the combined effect of oxy-fuel combustion and hydrogen addition on methane-fueled HCCI engines has never been assessed. To fill this research gap, we have performed an experimental campaign on a methane-hydrogen-fueled HCCI engine under enriched oxygen conditions. Adding oxygen when the hydrogen content is above 16% (based on the FuelMEP) has no relevant effect, neither on the Maximum Pressure Rise Rate nor on the combustion stability. Therefore, leveraging the fuel flexibility inherent in HCCI engines, oxyfuel combustion presents a viable strategy for enhancing power density in scenarios of hydrogen scarcity. However, when hydrogen is readily accessible, both techniques yield comparable outcomes in terms of Indicated Mean Effective Pressure (IMEP).
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Spano, S., & et al. (2024). Experimental investigation of CH4 - H2 blends combustion in HCCI engine under enriched oxygen conditions. International Symposium on combustion, milan. https://hdl.handle.net/2078.5/267773