Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Variation of Eigenvalues of the Multi-span Fuel Rod due to Periodic Flow Disturbance by the Flow Mixer

혼합날개의 주기적 유동교란에 따른 다점지지 연료봉의 고유치변화

  • 이강희 (한국원자력연구원 선진핵연료기술개발부) ;
  • 우호길 (충남대학교 기계공학부)
  • Published : 2010.03.20
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Abstract

Long and slender body, like a fuel rod, oscillating in axial flow can be unstabilized even by the small cross flow which can be activated by the flow mixer or turbulent generator. It is important to include these effects of flow disturbance in dynamic stability analysis of nuclear fuel rod. This work shows how eigen frequency of a multi-span fuel rod can be changed by the swirl flow, which is discretely generated by a flow mixer. By solving a state-space form of the eigenvalue equation for a multi-span fuel rod system, the critical velocity at which a fuel rod becomes unstable was calculated. Based on the simulation results, we evaluated how stability of a multi-spanned nuclear fuel rod with mixing vanes can be affected by the coolant flow in an operating reactor core.

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References

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