Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Analysis on the Modification of Near-wall Turbulent Characteristics of Temperature Field in a Channel imposed with Linearly Increasing Wall Disturbance

선형적으로 증가하는 벽면교란이 벽 근처 난류 온도장의 특성 변화에 미치는 영향 해석

  • Park, Soo Hyung (Department of Aerospace Information Engineering, Konkuk University) ;
  • Byun, Yung-Hwan (Department of Aerospace Information Engineering, Konkuk University) ;
  • Na, Yang (Department of Mechanical Engineering, Konkuk University)
  • Received : 2013.05.23
  • Accepted : 2013.09.10
  • Published : 2013.10.01
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Abstract

Large eddy simulation was performed to investigate the effect of linearly increasing wall disturbance on the modification of turbulent characteristics of temperature field in the vicinity of the wall. It was noted that temperature variance increased monotonically whereas temperature dissipation decreased significantly, resulting in a noticeable reduction in both time and length-scales. A sudden drop in turbulent Prandtl number down to around 0.25 in the near-wall region indicated that the similarity between velocity and temperature fields decreases near the wall as a result of linear wall disturbance.

난류 경계층이 형성되어 있는 채널 벽면에 주유동방향을 따라 선형적으로 증가하는 수직방향의 운동량 교란을 도입한 후 발생되는 난류 온도장의 특성 변화를 LES 기법을 사용하여 분석하여 보았다. 벽면교란이 부과된 후, temperature variance의 국부 최대값은 점진적으로 증가하나, 온도 소산량은 급격히 줄어들게 되면서 온도장의 시간스케일 및 Taylor micro length로 판단한 길이스케일이 모두 감소하는 것을 확인하였다. 또한 난류 Prandtl수가 벽면 근방에서 0.25정도까지 급격히 감소되었는데, 이는 벽면에 작용된 운동량 교란에 대한 속도장 및 온도장의 역학적 반응이 전반적으로 다르다는 것을 의미하며, 따라서 속도장과 온도장의 상사성이 급격히 감소된다는 것을 알 수 있었다.

Keywords

References

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