Volume 36 Issue 9
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MA Xingyu, CHEN Bo, ZHOU Chao. Experiment of oil droplet impacting on aluminium alloy surface[J]. Journal of Aerospace Power, 2021, 36(9): 1851-1860. doi: 10.13224/j.cnki.jasp.20200495
Citation: MA Xingyu, CHEN Bo, ZHOU Chao. Experiment of oil droplet impacting on aluminium alloy surface[J]. Journal of Aerospace Power, 2021, 36(9): 1851-1860. doi: 10.13224/j.cnki.jasp.20200495
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Experiment of oil droplet impacting on aluminium alloy surface

doi: 10.13224/j.cnki.jasp.20200495

  • Key Laboratory of Testing Technology for Manufacturing Process，Ministry of Education，School of Manufacturing Science and Engineering， Southwest University of Science and Technology，Mianyang Sichuan 621010，China

  • Received Date: 2020-11-19
  • Publish Date: 2021-09-28
    Abstract
  • The lubrication oil film on the surface of mechanical parts under spray or drip lubrication condition was influenced by the deposited film resulted from the impact of oil droplet with part surface.To understand the complex lubrication phenomena,it is necessary to study the impact behavior of oil droplet with metal solid substrate and the spreading process of deposited film.Therefore,an experimental apparatus was built to investigate the impact outcome of single oil droplet with aluminum alloy surface.High-speed photography was used to capture the oil droplet dynamical morphology and the spreading process of the subsequent film.The oil droplet deformation and the histories of spreading and recoiling of the film were analyzed qualitatively,and the effects of experimental condition and oil viscosity were discussed quantitatively.The experimental results showed that the deposited film spread outwards quickly, recoiled inwards very slowly, and reached eventually steady state.The whole film retraction and oscillation were not observed in the recoiling process.At lower impact angle,the slight slip between oil droplet and surface was found in the initial spreading stage, and due to the effects of gravity and spreading energy,finally,the film disintegrated without ejection of secondary oil droplets.The front spread factor increased with increasing impact velocity and decreasing impact angle,and the back spread factor increased with the increase of impact velocity and impact angle.The effect of oil droplet diameter on the front and back spread factors was insignificant.

     

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