EXPERIMENTAL INVESTIGATION OF COUPLE PRECESSING VORTEX ROPES IN A HYDRAULIC VORTEX

Read more The work is devoted to the experimental study of the interaction of the precessing vortex pair in the hydrodynamic vortex chamber. Swirling flow was created by a 12 tangentially directed rectangular nozzles. Design swirl number was varied in the range 0÷6.6 based on the geometry of the swirl device. The Reynolds number was varied in the range of 6 000÷52 000. Preliminary visual experiments has been conducted with changing output boundary conditions for controlling parameters of the vortex structure. It was found that stable mode with a double precessing structure is realized at full open outlet. Setting of diaphragm on the outlet of vortex chamber allows us to suppress the precession motion and significantly stabilize the flow. Further experiments included the quantitative measurement of the velocity distributions carried out using a laser Doppler anemometry (LDA).

Keywords:
spiral vortex, tangential chamber, precessing vortex core.
УДК 532.527

EXPERIMENTAL INVESTIGATION OF COUPLE PRECESSING VORTEX ROPES IN A HYDRAULIC VORTEX