한국유체기계학회 논문집 (The KSFM Journal of Fluid Machinery)

한국유체기계학회 (Korean Society for Fluid machinery)
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Characteristics of Friction Factor for Artificially Roughened Surfaces

  • 하태웅 (경원대학교 건축설비 기계공학부) ;
  • 주영찬 (경원대학교 건축설비 기계공학부) ;
  • 이용복 (한국과학기술연구원 트라이볼로지 연구센터) ;
  • 김창호 (한국과학기술연구원 트라이볼로지 연구센터)
  • 발행 : 2003.09.01
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초록

For measuring friction factor of artificially-roughened surfaces which are usually applied to damper seals, flat plate test apparatus is designed and fabricated. The measurements of leakage flow and pressure distribution through round-hole patterned specimen with different hole areas are described, and a method is discussed for determining the friction factor experimentally. Results show that the friction factor of the round-hole patterned surface is bigger than that of smooth surface, and increases as increasing the hole area. A empirical friction factor model for the round-hole patterned surface can be descrived by the Moody's friction factor formula.

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참고문헌

  1. Hirs, G., 1973, ‘A Bulk-Flow Theory for Turbulence in Lubricant Films,’ Journal of Lubrication Technology, pp. 137-146
  2. Nelson, C. and Nguyen, D., 1987, ‘Comparison of Hirs' Equation with Moody's Equation for Determining Rotordynamic Coefficients of Annular Pressure Seals,’ Journal of Tribology, Vol. 109, pp. 144-148
  3. Yamada, Y, 1962, ‘Resistance of Flow Through an Annulus with Inner Rotating Cylinder,’ Bull. JSME, No.5, Vol. 18, pp. 302-310
  4. Von Pragenau, G., 1982, 'Damping Seal for Turbomachinery,' NASA Technical Paper No. 1987
  5. Iwatsubo, T. and Sheng, B., 1990, ‘An Experimental Study on the Static and Dynamic Characteristics of Damp Seals,’ Proceedings of the Third IFToMIvr International Conference on Rotordynamics, Lyon, France, pp. 307-312
  6. Ha, T. W. and Childs, D. W., 1992, ‘FrictionFactor Data for Flat Plate Tests of Smooth and Honeycomb Surfaces,’ ASME Journal of Tribology, Vol 114, pp. 722-730
  7. 하태웅, 1998, ‘고성능 원심펌프에서 임펠러 시라우드 및 마모 실의 유체가진력 해석,’ 대한기계학회 논문집, A권, 제22권, 제1호, pp. 102-110