A Visual Study on Elliptical Jets in Cross Flow

Article type: Research Article

Authors: New, T.H. | Lim, T.T. | Luo, S.C.

Affiliations: Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore.

Abstract: Laser-induced fluorescence technique is used to study the near-field of an elliptical jet exiting normally into a cross flow, for elliptic jet having aspect ratio of 2 and 3. Results show that the non-uniform curvature of the elliptic geometry causes the leading-edge vortices at the interface between the jet and the cross flow to behave differently from that of a circular jet. In particular, when the major-axis is aligned with the cross flow there is an intense interaction between the leading-edge vortices which culminates in the pairing of adjacent vortices. The pairing is suppressed when the major axis is perpendicular to the cross flow.

Keywords: flow visualization, elliptical jet, jet in cross flow, laser-induced fluorescence, dye-injection

Journal: Journal of Visualization, vol. 5, no. 2, pp. 129-136, 2002