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Performance evaluation of nano-graphene lubricating oil with high dispersion and low viscosity used in diesel engines

  • 0School of Traffic Engineering, Jiangsu Shipping College, Nantong, China.
Plos One +

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August 16, 2024

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August 16, 2024

View abstract on PubMed

Summary

This summary is machine-generated.

Nano-graphene lubricating oil shows reduced friction and improved fuel economy in engines. However, it significantly increases particulate matter emissions, requiring further study for engine application.

Area Of Science

  • Tribology
  • Materials Science
  • Mechanical Engineering

Background

  • Nano-graphene lubricating oil exhibits promising anti-friction and anti-wear properties in basic tests.
  • Widespread application in engines is hindered by a lack of data on its real-world impact on engine performance and emissions.

Purpose Of The Study

  • To prepare stable nano-graphene lubricating oil via chemical grafting.
  • To investigate the effects of nano-graphene on lubricating oil properties.
  • To evaluate the impact of nano-graphene lubricating oil on engine power, fuel economy, and emissions.

Main Methods

  • Chemical grafting of nano-graphene powder to enhance dispersion in lubricating oil.
  • Analysis of physicochemical properties: kinematic viscosity, density, flash point, pour point, and total acid value.
  • Engine performance testing: power, fuel consumption, and emissions (HC+NOX, CH4, CO2, PM).
  • Particle emission analysis: quantity concentration of nuclear, accumulated, and total particles.

Main Results

  • Improved dispersion of nano-graphene in lubricating oil.
  • Slight decrease in kinematic viscosity; minimal impact on other physicochemical properties.
  • Reduced friction loss (1.82-5.53% decrease in reversed towing torque).
  • Improved fuel economy (reduced specific fuel consumption).
  • No significant change in HC+NOX, CH4, CO2 emissions.
  • Increased particulate matter (PM) emissions by 8.85%.
  • Significantly higher concentrations of nuclear, accumulated, and total particles, especially under higher loads.

Conclusions

  • Nano-graphene lubricating oil offers benefits in friction reduction and fuel efficiency.
  • A notable increase in particulate matter emissions and particle concentrations is observed.
  • Further research on post-processing systems and control strategies is crucial for engine application.