The Impact of Oil-Based Diamond Nanofluids on Diesel Engine Performance
Experimental test were carried out to investigate the effects of adding oil-based nanodiamond lubricant both in friction tester and diesel engine. Tribology, engine performance, fuel economy and the temperature field of one piston are important aspects of
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Abstract Experimental test were carried out to investigate the effects of adding oil-based nanodiamond lubricant both in friction tester and diesel engine. Tribology, engine performance, fuel economy and the temperature field of one piston are important aspects of this work. To this end, surface-modified nanodiamond lubricant of 0.1 wt% was used in a four-stroke diesel engine. The results indicate that adding nanodiamond particles to engine oil has a perceptible effect on engine performance, increasing the maximum engine power and the maximum torque relatively to 1.15, 1.18 % respectively, while decreasing the fuel consumption relatively to 1.27 % as compared to the engine oil.
Keywords Nanofluid Diamond Bench test Engine performance Fuel economy
1 Introduction Machine components and friction pairs rely on high-quality lubricant oil to withstand high temperature and extreme pressure in internal combustion engine. Especially the piston and cylinder system under in the harsh environment of high temperature, overload and low speed. With high-quality lubricant oil, it can reduce engine wear, prolong engine life and improve the fuel economy. Application of nanomaterials as lubricant oil additives has become a rapidly progressing field of F2012-A09-006 H. Liu (&) M. Bai Y. Qu Dalian University of Technology, 116024, Dalian, China e-mail: [email protected]
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 190, DOI: 10.1007/978-3-642-33750-5_40, Ó Springer-Verlag Berlin Heidelberg 2013
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research since nanomaterials are different from traditional bulk materials due to their excellent physical properties. Tribology research shows that lubricant oils with nanoparticles (MoS2, CuO, TiO2, diamond, etc.) exhibit improved load carrying capacity, anti-wear and friction-reduction properties [1, 2]. Peng et al. [3] found from their experiments that the diamond nanoparticle as additive in liquid paraffin at appropriate concentration can show better tribological properties for antiwear and antifriction than the pure paraffin oil. Tao et al. [4] investigated diamond nanoparticles as an oil additive and found that under boundary lubricating conditions, the ball-bearing effect of diamond nanoparticles existed between the rubbing surfaces, the surface polishing and the increase in surface hardness effects of the diamond nanoparticles were the main reasons for the reduction in wear and friction. Friction coefficients in the range 0.04–0.20 have been reported by Hayward et al. for natural diamondon-diamond atmospheric sliding experiments, without the necessity for additional lubrication [5]. In contrast to most other engineering surfaces, the diamond-ondiamond friction coefficient depends on the surface roughness of the films [6, 7]. In that sense, the friction coefficient for the diamond coatings tested in Hayward et al.’s work [5] gave values from 0.03 up to values considerably higher (0.50). Experiment results
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