Experimental Analysis of Combustion and Emission Characteristics of a Diesel Engine Using Diesel-Biodiesel-Methanol...

Area of Science:

• Internal Combustion Engines
• Combustion Chemistry
• Alternative Fuels

Background:

• Diesel pilot injection (PI) mode can increase smoke emissions.
• Biodiesel derived from waste cooking oil (B30) is a sustainable fuel option.
• Methanol and cetane enhancers (CE) can modify combustion characteristics.

Purpose of the Study:

• To reduce smoke emissions in diesel pilot injection (PI) mode.
• To evaluate the effects of methanol and a cetane enhancer (CE) on B30 fuel performance.
• To optimize pilot injection timing (PIT) and pilot injection ratio (PIR) for improved efficiency and reduced emissions.

Main Methods:

• Investigated PI mode using B30 fuel, M10 (10% methanol in B30), and A1 (M10 + 0.5% di-tert-butyl peroxide CE).
• Varied pilot injection timing (PIT) and pilot injection ratio (PIR).
• Conducted experiments on an automotive diesel engine at 1600 rpm and 90% load.

Main Results:

• The A1 blend with 10% PIR and -30° PIT improved fuel consumption by 8.77% and thermal efficiency by 13.77% compared to the reference.
• Significant reductions in carbon monoxide (CO) by 66.66%, nitrogen oxides (NOx) by 6.43%, and hydrocarbons (HC) by 8.11% were observed.
• Smoke emissions increased by only 2.65%.

Conclusions:

• Optimized PI parameters with A1 blend effectively reduce harmful emissions and improve engine efficiency.
• The use of methanol and CE in B30 fuel presents a viable strategy for cleaner diesel combustion.
• Waste cooking oil-derived biodiesel shows promise as a sustainable fuel component for emission reduction.