Stereoscopic-PIV measurement of turbulent jets issuing from a sharp-edged circular nozzle with multiple triangular tabs
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- Title
- Stereoscopic-PIV measurement of turbulent jets issuing from a sharp-edged circular nozzle with multiple triangular tabs
- Authors
- Lee, SJ; Young Gil Jang; Choi, YS
- Date Issued
- 2012-09
- Publisher
- KOREAN SOC MECHANICAL ENGINEERS
- Abstract
- Three-dimensional (3D) flow structures of a turbulent jet issuing from a sharp-edged circular nozzle having multiple triangular tabs are experimentally studied by employing a stereoscopic-PIV (SPIV) system. Two different sharp-edged jet nozzles having 4 and 8 tabs are investigated at a jet Reynolds number of Re = 10,000. The SPIV measurements are carried out at 5 different cross-sectional planes along the jet direction. Spatial distributions of turbulent statistics including mean velocity, mean vorticity, and turbulent kinetic energy are obtained at each cross-sectional plane. The jet entrainment rate showing the mixing of the jet and ambient fluids is also estimated using the measured 3D velocity field information. As a result, the jet issuing from the nozzle with 4 tabs shows better turbulent mixing effect at further downstream position than the 8 tabs case because of the reduced reciprocal interactions of the streamwise vortices that promote the turbulent dissipation.
- Keywords
- Flow control; Jet; Stereoscopic PIV; Tab; Turbulent mixing; VORTEX-GENERATORS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15665
- DOI
- 10.1007/S12206-012-0725-8
- ISSN
- 1738-494X
- Article Type
- Article
- Citation
- Journal of Mechanical Science and Technology, vol. 26, no. 9, page. 2765 - 2771, 2012-09
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