Biodiesel Performance and Emission Characteristics in Diesel Engines

Biodiesel, derived from renewable biological sources, has emerged as a viable alternative to petroleum diesel in compression ignition engines. Its higher oxygen content and viscosity influence combustion kinetics, often yielding lower particulate and carbon monoxide emissions, while tending to elevate nitrogen oxides. Engine modifications, including advanced injection timing and optimised combustion chamber geometries, can mitigate such trade-offs. Recent advances in nano-additives and fuel emulsions have further enhanced atomisation, increased brake thermal efficiency and reduced unburned hydrocarbons. Lifecycle analyses underscore biodiesel’s potential to lower greenhouse-gas emissions on a well-to-wheel basis, supporting global decarbonisation targets. Challenges remain in cold-flow properties, long-term material compatibility and standardisation across diverse feedstocks, but ongoing research continues to refine blends and engine controls to harmonise performance with stringent emissions regulations.

Research from Nature Portfolio

Experimental work has demonstrated that incorporation of metal-oxide nanoparticles into biodiesel–diesel blends can significantly improve engine performance and emissions. For instance, zinc oxide nano-additives dispersed at low concentrations enhance in-cylinder mixing, leading to higher brake thermal efficiency and reductions in smoke, carbon monoxide and hydrocarbon emissions without compromising power output. Engine trials with modified fuel injectors and optimised injection pressure reveal that nano-enriched blends maintain stable combustion, increase heat release rates and suppress particulate formation. Such studies highlight the promise of controlled nanoparticle dispersion to advance next-generation biodiesel formulations.

Biodiesel Performance and Emission Characteristics in Diesel Engines publication trend

The graph below shows the total number of articles in biodiesel performance and emission characteristics in diesel engines across all publications each year (not limited to Nature Index journals).

Technical terms

Brake thermal efficiency (BTE): The ratio of useful mechanical work output to the energy input in the fuel, indicating conversion efficiency.

Brake specific fuel consumption (BSFC): Fuel mass flow rate per unit of brake power, reflecting engine fuel economy.

Particulate number (PN): A count of solid particles emitted per unit of exhaust volume, often used to assess ultrafine particulate pollution.

Response surface methodology (RSM): A statistical approach for designing experiments and modelling the relationships between input variables and responses.

Common rail direct injection (CRDI): A high-pressure fuel injection system that delivers precise, electronically controlled pulses of fuel into the combustion chamber.

References

1. Hazardous particles during diesel engine cold-start and warm-up: Characterisation of particulate mass and number under the impact of biofuel and lubricating oil. Journal of Hazardous Materials (2023).
2. Response surface methodology (RSM) for optimizing engine performance and emissions fueled with biofuel: Review of RSM for sustainability energy transition. Results in Engineering (2023).
3. Experimental investigation on performance, combustion and emission characteristics of DI diesel engine using algae as a biodiesel. Energy Reports (2020).
4. Study of diesel engine characteristics by adding nanosized zinc oxide and diethyl ether additives in Mahua biodiesel–diesel fuel blend. Scientific Reports (2020).