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Design of Sharp-edged Type Damping Orifices for an Aircraft Door Damper

민항기 door damper용 칼날형 댐핑 오리피스의 설계

  • Hong, Yeh-Sun (Korea Aerospace University Department of Aerospace & Mechanical Engineering) ;
  • Kwon, Yong-Cheol (Korea Aerospace University Department of Aerospace & Mechanical Engineering) ;
  • Kim, Chong-Hyeok (Korea Aerospace University Department of Aerospace & Mechanical Engineering) ;
  • Park, Seol-Hye (Hanwha Corporation Aerospace R&D center) ;
  • Park, Ho-Yeol (Hanwha Corporation Aerospace R&D center) ;
  • Kim, Sang-Beom (Hanwha Corporation Aerospace R&D center)
  • Received : 2012.06.28
  • Accepted : 2012.11.16
  • Published : 2012.12.01

Abstract

In this paper a sharp-edged type damping orifice for an aircraft door damper were designed, where the dynamic viscosity of working fluid were assumed to change up to 400cSt. The discharge coefficient of the damping orifice were investigated by CFD analyses and experiments. In particular, the influences of orifice diameter, edge angle, flow direction and the Reynolds number were taken into consideration. Based on this, it has been deduced how high Coulomb friction forces of damper seals is to be allowed to meet the performance criterion with respect to the orifice size.

본 논문에서는 작동유의 최대 동점성 계수가 400cSt까지 변하는 조건에서 항공기 도어 댐퍼용 칼날형 댐핑 오리피스를 설계하였다. 전산 유동 해석과 실험을 통하여 칼날 오리피스의 유량계수를 분석하였고, 오리피스의 크기와 칼날 각도, 유동방향, 레이놀즈수가 미치는 영향을 고려하였다. 이 결과를 바탕으로 오리피스의 크기에 따라 댐퍼의 성능 기준을 충족시키기 위해 제한해야 하는 댐퍼의 쿨롱 마찰력 범위를 유도하였다.

Keywords

References

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