Compressible vortex loops: effect of nozzle geometry

Zare-Behtash, H., Kontis, K., Gongora-Orozco, N. and Takayama, K. (2009) Compressible vortex loops: effect of nozzle geometry. International Journal of Heat and Fluid Flow, 30 (3), 561-576. (doi:10.1016/j.ijheatfluidflow.2009.02.022).

Record type: Article

Abstract

Vortex loops are fundamental building blocks of supersonic free jets. Isolating them allows for an easier study and better understanding of such flows. The present study looks at the behaviour of compressible vortex loops of different shapes, generated due to the diffraction of a shock wave from a shock tube with different exit nozzle geometries. These include a 15 mm diameter circular nozzle, two elliptical nozzles with minor to major axis ratios of 0.4 and 0.6, a 30 × 30 mm square nozzle, and finally two exotic nozzles resembling a pair of lips with minor to major axis ratios of 0.2 and 0.5. The experiments were performed for diaphragm pressure ratios of P₄/P₁= 4, 8, and 12, with P₄ and P₁being the pressures within the high pressure and low pressure compartments of the shock tube, respectively. High-speed schlieren photography as well as PIV measurements of both stream-wise and head-on flows have been conducted.

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