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Flow Structure of Conical Vortices Generated on the Roof of a Rectangular Prism
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 Title & Authors
Flow Structure of Conical Vortices Generated on the Roof of a Rectangular Prism
Kim, Gyeong-Cheon; Ji, Ho-Seong; Seong, Seung-Hak;
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 Abstract
Characteristics of the conical vortices on the roof corner of a rectangular prism have been investigated by using a PIV(Particle Image Velocimetry) technique. The Reynolds number based on the free stream velocity and the height of the model was 5.310. The mean, instantaneous velocity vector fields, vorticity fields, and turbulent kinetic energy distribution were measured for two different angles of attack, 30and 45. The PIV measurements clearly observed not only the conical main vortex and the secondary vortex but also the tertiary vortex which is firstly reported in this paper. Asymmetric formation of the corner vortex for the case of 30angle of attack produces relatively the high magnitude of vorticity and turbulent kinetic energy around the bigger vortex which generates the peak suction pressure on the roof. Fairly symmetric features of the roof vortex are observed in the case of 45angle of attack, however, the dynamic characteristics are proved to be asymmetric due to the rectangular shape of the roof.
 Keywords
PIV;Particle Image Velocimetry;Rectangular Prism;Conical Vortices;Wind Tunnel Measurement;Instantaneous and Ensemble Averaged Velocity Fields;Vorticity and Turbulent Kinetic Energy Fields;
 Language
Korean
 Cited by
1.
두꺼운 난류경계층 내부에 놓인 직사각형 프리즘 주위의 유동구조,김경천;지호성;추재민;이석호;성승학;

대한기계학회논문집B, 2002. vol.26. 4, pp.578-586 crossref(new window)
2.
직사각형 프리즘 주위의 유동구조에 대한 경계층 두께의 영향,지호성;김경천;이승홍;부정숙;

대한기계학회논문집B, 2002. vol.26. 6, pp.893-901 crossref(new window)
3.
관통류를 갖는 물체의 후류특성에 관한 실험적 연구,조대환;오승진;한상국;

한국기계기술학회지, 2013. vol.15. 2, pp.217-222
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