Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Numerical Study on the Flow Characteristics according to the Ventilation Holes Shape of the Carbon Composite Brake Disk

탄소복합재 브레이크 디스크의 통풍구 형상에 따른 유동특성에 관한 해석적 연구

  • Ko, Dongguk (Department of Mechanical Engineering, Graduate School, Chonbuk National University) ;
  • Yoon, Suckju (Department of Mechanical Engineering, Chonbuk National University)
  • 고동국 (전북대학교 대학원 기계공학과) ;
  • 윤석주 (전북대학교 기계공학과)
  • Received : 2014.07.25
  • Accepted : 2014.12.03
  • Published : 2015.03.01
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Abstract

In this study, the flow characteristics at the ventilation holes was analyzed by using numerical method when carbon composite brake disk was rotated at a constant speed. In order to ensure the validity of the analysis results, grid dependency test was performed by considering the accuracy and appropriateness, and 4mm mesh size was selected for decrease of the maximum error rate 63.6%. As a result, the outside air flows in the clearance between the disk and shaft in case of B model. whereas, the outside air flows in the clearance or the outlet of the ventilation holes in case of A and C models. And also average static pressure at the outlet was changed depending on shape of the ventilation holes and rotational speed of the disk in case of A and C models. Besides, in the B model, intake air according to the clearance goes with side surface of ventilation hole, and so increased by mean velocity of 4.64m/s and mean pressure of 0.58pa in the ventilation hole outlet, in case of disk rotational speed of 146.21rad/s.

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References

  1. M. R. Ryu, H. E. Bae, H. S. Kim, D. H. Lee, S. B. Lee and J. H. Park, "A Study on Braking Performance of Break Disc," Journal of the Korean Society of Manufacturing Process Engineers, Vol.12, No.3, pp.13-20, 2013.
  2. A. Belhocine and M. Bouchetara, "Thermomechanical Modelling of Dry Contacts in Automotive Disc Brake," Journal of Thermal Sciences, Vol.60, pp.161-170, 2012. https://doi.org/10.1016/j.ijthermalsci.2012.05.006
  3. J. U. Cho and M. S Han, "Structural and Thermal Analysis of Disk Brake," Journal of the Korean Society of Machine Tool Engineers, Vol.19, No.2, pp.211-215, 2010.
  4. M. G. Kim, S. K. Ko and M. W. Lee, "A Study for the Cooling Performance of a Brake with Heat Pipes," Journal of the Korean Society of Marine Engineering, Vol.32, No.4, pp.563-569, 2008. https://doi.org/10.5916/jkosme.2008.32.4.563
  5. J. T. Kim, A Numerical Study of Thermal Performance in Ventilated Disk Brake under Repeated Applications, Ph. D. Dissertation, Chonbuk National University, Jeonbuk, Korea, 2001.
  6. J. Y. Kim, FLUENT Basic of ANSYS(R)CFD, tsne, Seoul, 2010.
  7. Y. J. Seo, J. H, Oh, J. S. Lee, K. S. Kang and G. S. Jung, "A Study on the Crossing-drilling Effects of Brake Disk Rotor," Transactions of KSAE, Vol.16, No.1, pp.100-105, 2008.
  8. H. K. Myong, An Introduction to CFD, Munundang, Seoul, p.19, 2011.