EXPERIMENTAL INVESTIGATION OF DOUBLE PRECESSING VORTEX ROPE FORMING IN DRAFT TUBE MODELS
0000-0002-9198-3705 The material was received by the Editorial Board: 11.03.2015
This work is devoted to the experimental research of the flow structure in draft tube models of hydro turbines. Precessing vortex core was formed using fixed swirler in a flow such as observed in natural hydro turbines under off-design conditions. In laboratory conditions it has been able to find the effect of the transition between single- and double- vortex rope. Their frequency characteristics have been measured in the range of Reynolds numbers 5·104 –5·105 . Based on the analysis of data high-speed shooting the mechanism of complete transition between single and double vortex modes was investigated in detail. The investigation of this phenomenon is of particular interest for the design and operation of hydraulic turbine equipment due to off-design pressure pulsations with sudden changes in frequency and amplitude in a flow occurring. Keywords:
precessing vortex core, draft tube, swirling flow, pressure pulsations.
УДК 532.5.032
EXPERIMENTAL INVESTIGATION OF DOUBLE PRECESSING VORTEX ROPE FORMING IN DRAFT TUBE MODELS References: Skripkin S. G., Tsoy M. A., Shtork S. I. EXPERIMENTAL INVESTIGATION OF DOUBLE PRECESSING VORTEX ROPE FORMING IN DRAFT TUBE MODELS. Vestnik NSU. Series: Physics. 2015, vol. 10, no. 2. P. 73–82 (in Russ.). DOI: 10.54362/1818-7919-2015-10-2-73-82