Mixing Fuels for Cleaner Engines: A New Approach

Reacting to the Challenge

Engineers are constantly seeking ways to improve engine performance while minimizing pollution. One promising approach is Reactivity Controlled Compression Ignition (RCCI), which involves using two different fuels simultaneously. This method leverages the unique properties of each fuel to enhance combustion efficiency and reduce harmful emissions.

The Study: A Dual-Fuel Experiment

In a recent study, researchers tested RCCI using a modified engine. They employed a blend of n-butanol and gasoline injected into the intake port and a biodiesel blend injected directly into the cylinder. The team experimented with various fuel combinations to evaluate their performance and emission profiles.

Key Findings

• B20+G50n-b50: This combination produced the highest cylinder pressure and power output. However, it also resulted in increased emissions of carbon monoxide (CO) and hydrocarbons (HC).
• B20+G25n-b75: This mix significantly reduced emissions of nitrogen oxides (NOx) and carbon dioxide (CO₂) but led to higher levels of CO and HC.

Conclusion and Future Directions

The study demonstrates that RCCI with renewable and oxygenated fuels holds great potential for cleaner and more efficient engines. However, the optimal fuel mix must be carefully selected to balance performance and emissions. Further research is needed to refine these fuel combinations for various engine conditions.