INCORPORATION OF BACK-PRESSURE EFFECTS IN THE MODELING OF THE PISTON RING/CYLINDER LINER

Authors

  • Alfredo Jaramillo Palma USP
  • Hugo Checo Silva UnB
  • Gustavo Carlos Buscaglia USP

DOI:

https://doi.org/10.26512/ripe.v2i5.21251

Keywords:

Hydrodynamic lubrication, Friction force, Back-pressure effects, Elrod-Adams model

Abstract

The piston ring/cylinder liner system is responsible for about 5% of the energy lose due to friction in a passenger car (Holmberg et al., 2012). Consequently, automotive industry and academy have made efforts seeking for designs that diminish both friction and wear. During the last year, several numerical and experimental studies have shown that texturization can have favorable or detrimental effects on the tribological characteristics of lubricated mechanisms. However, few studies have included the effects of the gas pressure in the combustion chamber, which variates rapidly in the compression stroke and can reach values as high as 60[atm]. Reynolds equation with zero-pressure Dirichlet conditions is mainly adopted in numerical works along with Elrod-Adams cavitation model. This cavitation model only admits a constant cavitation pressure, in spite it is known that cavitation pressure can variate according to the operational conditions (Shen et al., 2013). This work is devoted to the study of the effects that the combustion chamber pressure can have on both the mechanical dynamic of the rings end the cavitation pressure pcav.

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References

Alt, H. W. 1980. Numerical solution of steady-state porous flow free boundary problems. Numer. Math. vol. 36.n. 1, pp. 73”“98.

Ausas, R. et al. 2007. The impact of the Cavitation model in the Analysis of Micro-Textured Lubricated Journal bearings. ASME J. Tribol. vol. 129.n. 4, pp. 868”“875.

Checo, H. M. et al. 2014. Moving textures: Simulation of a ring sliding on a textured liner. Tribol. Int. vol. 72, pp. 131”“142.

Dobrica, M. B. et al. 2010. Optimizing surface texture for hydrodynamic lubricated contacts using a mass-conserving numerical approach. Proc. IMechE vol. 224.n. 8, pp. 737”“750.

Gadeschi, G. B., K. Backhaus, & G. Knoll. 2012. Numerical Analysis of Laser-Textured Piston-Rings in the Hydrodynamic Lubrication Regime. ASME J. Tribol. vol. 134.n. 4, pp. 1”“8.

Holmberg, K., P. Andersson, & A. Erdemir. 2012. Global energy consumption due to friction in passenger cars. Tribol. Int. vol. 47, pp. 221”“234.

Marini, L. D. & P. Pietra. 1986. Fixed-point Algorithms for Stationary Flow in Porous Media.

Comput. Methods Appl. Mech. Eng. vol. 56.n. 1, pp. 17”“45.

Morris, N., M. Leighton, et al. 2014. Combined numerical and experimental investigation of the micro-hydrodynamics of chevron-based textured patterns influencing conjunctional friction of sliding contacts. Proc. Inst. Mech. Eng. Part J J. Eng. Tribol. n. 4.

Morris, N., R. Rahmani, et al. 2015. A Numerical Model to Study the Role of Surface Textures at Top Dead Center Reversal in the Piston Ring to Cylinder Liner Contact. J. Tribol. vol. 138.n. 2, p. 021703.

Qiu, Y. & M. M. Khonsari. 2009. On the Prediction of Cavitation in Dimples Using a Mass-Conservative Algorithm. ASME, J. of Trib. vol. 131.n. 4, pp. 041702”“1.

Shen, C. & M. M. Khonsari. 2013. On the Magnitude of Cavitation Pressure of Steady-State Lubrication. Tribol. Lett. vol. 51.n. 1, pp. 153”“160.

Usman, A. & C.W. Park. 2016. Optimizing the tribological performance of textured piston ringliner contact for reduced frictional losses in SI engine:Warm operating conditions. Tribol. Int. vol. 99, pp. 224”“236.

Wang, Q. J. & Chung Y. W. 2013. Encyclopedia of Tribology. First. Springer.

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Published

2017-08-22

How to Cite

Palma, A. J., Silva, H. C., & Buscaglia, G. C. (2017). INCORPORATION OF BACK-PRESSURE EFFECTS IN THE MODELING OF THE PISTON RING/CYLINDER LINER. Revista Interdisciplinar De Pesquisa Em Engenharia, 2(5), 151–163. https://doi.org/10.26512/ripe.v2i5.21251