Analysis of flow characteristics around the sunroof opening variation with sunroof deflector angle

Sung Won Lee; Seongryong Shin; Eui Sung Choi; Juwan Yi

doi:10.7776/ASK.2018.37.5.285

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2018 Vol.37, Issue 5 Preview Page Next Page

Research Article

Analysis of flow characteristics around the sunroof opening variation with sunroof deflector angle 썬루프 디플렉터 각도에 따른 썬루프 개구부 주변 유동 특성 연구

30 September 2018. pp. 285-291

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Abstract

In the present study, flow characteristics and wind noises around the sunroof opening are analyzed variation with panoramic sunroof deflector angle. A mesh deflector is attached to reduce wind noise while a car is driving with the panoramic sunroof opening. A new forward inclined type deflector was invented to improve wind noise. The effect of this new concept of mesh deflector on the open-panoramic flow characteristics and wind noises were studied with CAT (Computer Aided Test) and wind tunnel test, which shows the reduction of open-panoramic wind noises such as sunroof buffeting, sunroof booming, and turbulent noise. Therefore, the forward inclined type deflector can efficiently improve wind noise with the same production cost.

Keywords

Wind noise

Panoramic sunroof

Mesh deflector

Wind tunnel test

CAT (Computer Aided Test)

본 연구에서는 차량에 장착되는 파노라마 썬루프 디플렉터의 각도에 따른 개구부 주변 유동 특성을 분석하고 공력소음에 미치는 영향을 확인하였다. 파노라마 썬루프 개방 후 주행 시 공력소음을 저감하기 위해 메쉬 디플렉터를 장착하는데, 후방향인 기존 메쉬 디플렉터 각도를 전방향으로 변경하였을 때 유동 변화와 공력소음 기여도를 분석하였다. 이를 위하여 CAT(Computer Aided Test)와 실차 풍동 평가를 진행하였으며, 전방경사형 디플렉터에서 기존 디플렉터 대비 원활한 유동의 흐름과 유동 방향의 상향으로 공력소음이 개선되는 것을 확인하였다. 전방경사형 디플렉터 적용 시 동등한 원가에서 공력소음을 개선할 수 있을 것으로 기대된다.

키워드

바람소리

파노라마 썬루프

메쉬 디플렉터

풍동 시험

CAT(Computer Aided Test)

References

Y. Li, A. Jammalamadaka, P. Gopalakrishnan, R. Zhang, and H. Chen, “Computation of high subsonic and transonic flows by a Lattice Boltzmann Method,” 54th AIAA Meeting (2016).

S. R. Shin, K. D. Ih, J. Cho, and M. S. Kim, “Development of virtual sunroof buffeting test process using DFSS approach,” FISITA Paper F2010-C-196 (2010).

M. J. Lighthill, “On sound generated aerodynamically”, Proc. the Royal Society, Series A, 211 (1952).

Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 37
No :5
Pages :285-291
Received Date : 2018-05-28
Revised Date : 2018-07-09
Accepted Date : 2018-09-20
DOI :https://doi.org/10.7776/ASK.2018.37.5.285

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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