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The Power Spectral Density Characteristics of Lift and Drag Fluctuation of Fin Tube in a Heat Recovery Steam Generator

배열회수 보일러 단일 휜튜브의 양력과 항력 변동에 따른 PSD 특성 연구

Ha, Ji Soo;Lee, Boo Youn
하지수;이부윤

  • Received : 2015.10.24
  • Accepted : 2016.03.19
  • Published : 2016.04.30

Abstract

Heat exchanger tube array in a heat recovery steam generator is exposed to the hot exhaust gas flow and it could cause the flow induced vibration, which could damage the heat exchanger tube array. It is needed for the structural safe operation of the heat exchanger to establish the characteristics of flow induced vibration in the tube array. The researches for the flow induced vibration of typical heat exchangers have been conducted by using single cicular tube or circular tube array and the nondimensional PSD(Power Spectral Density) function with the Strouhal number, fD/U, had been derived by experimental method. From the present study, the basis for the application of flow induced vibration to the heat recovery steam generator tube array would be prepared. For the previous mentioned purpose, the present CFD analysis introduced a single fin tube and calculated with the unsteady laminar flow over the single fin tube. The characteristics of vortex shedding and lift and drag fluctuation over the fin tube was investigated. The derived nondimensional lift PSD was compared with the results of the previous experimental studies and the characteristics of lift and drag PSD over a single fin tube was established from the present CFD study.

Keywords

heat exchanger;circular cylinder;flow induced vibration;lift fluctuation;drag fluctuation;power spectral density;Karmann vortex;unsteady laminar flow;FFT

References

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Acknowledgement

Supported by : 계명대학교