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Analysis of Dynamic Characteristics of a Piston for a Linear Compressor Considering Changes in Groove Geometry
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  • Journal title : Tribology and Lubricants
  • Volume 31, Issue 5,  2015, pp.221-228
  • Publisher : The Korean Society of Tribologists and Lubrication Engineers
  • DOI : 10.9725/kstle.2015.31.5.221
 Title & Authors
Analysis of Dynamic Characteristics of a Piston for a Linear Compressor Considering Changes in Groove Geometry
Noh, Sangwan; Oh, Wonsik; Park, Kyeongbae; Rhim, Yoonchul;
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It is possible to prevent a piston from contacting the cylinder by changing the shape of the piston or by applying micro-textures, such as micro-grooves or micro-holes, over the piston surface. Usually, the minimum radial clearance reaches its minimum value at the beginning of the suction stroke because the pressure around the piston is low and almost axisymmetric such that the net pressure force on the piston is not sufficiently high to support the piston from touching the cylinder. In this study, we apply a series of saw-tooth-shaped grooves on the piston surface, and numerically investigate the effects of groove depth, groove angle, and the number of grooves with radial clearance variations using a finite difference method. We conduct a dynamic analysis of the piston for various changes in groove geometries to obtain the minimum radial clearance variation for the entire compression cycle. The minimum radial clearance increases while friction loss decreases when we apply the series of saw-tooth-shaped grooves on the piston. In addition, we analyze the impact of the change in the groove shape variable due to changes in radial clearance. Leakage variations are relevant to radial clearance, but have almost no effect on the groove parameters.
compressor;piston;groove;clearance;friction loss;
 Cited by
Hong, S. H., Son, S. I., Kim, K. W. “Comparative Study of the Naver-Stokes Equation & the Reynolds Equation in Spool Valve Analysis Considering Cavitation”, J. Korean Soc. Tribol. Lubr. Eng., Vol. 29, No. 5, pp. 275-285, 2013.

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Bilgin Hacioglu, Zafer Dursunkaya, “Effect of Oil Feed Groove on Compressor Piston Lubrication”, International Compressor Engineering Conference, pp. 1887, 2008.

Ashwin Ramesh, Wasim Akram, Surya P. Mishra, Andrew H. Cannon, Andreas A. Polycarpou, William P. King “Friction characteristics of microtextured surfaces under mixed and hydrodynamic lubrication”, Tribology International, Vol. 57, pp. 170-176, 2013. crossref(new window)

Noh, S. W., Oh, W. S., Park, G. B., Rhim, Y. C. “Analysis of dynamic characteristics of piston type compressor considering piston geometric parameters”, Proc. Spring Conference of the KSTLE, 119-120, 2015.