The Digest’s 2025 Multi-Slide Guide to Alcohol Combustion in CI Engines

This presentation highlights ethanol/methanol for off-road decarbonization, despite their low ignitability for compression ignition. Pilot injections are key, creating a flame kernel to ignite main sprays. Ethers improve ignitability but reduce efficiency in single-fuel blends, lowering NOx. Methanol port injection struggles with vaporization, causing liquid entry and weak combustion. Notably, active pre-chamber jets achieve diesel-like stability for methanol sprays, demonstrating robust low-load ignition. This defines a pathway for renewable liquid fuels.