Laser Doppler diagnostics of flow structure downstream the rotor wheel in hydroturbine for optimal and boost loadings
O.Yu. Sadbakov1, V.L. Okulov1, I.V. Naumov1, V.G. Miledin1, Yu.A. Anikin1, N.P. Mostovsky2, and S.Ya. Il'in2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Laboratory of water turbines, Leningrad Metal Plant, OAO "Silovye Mashiny", St.-Petersburg, Russia
Pages: 561-566
Abstract
Experimental results on diagnostics of unsteady flow downstream of the rotor wheel in the draft tube (Francis turbine) are presented for transition from the optimal operation mode to the boost mode. The high-accuracy measurements of velocity profiles in swirl flow (turbid water flow with air bubbles) were carried out with a high-tech Doppler anemometor LAD05-LMZ equipped with semiconductor laser. This system is equipped with "Field Programmable Gate Array" facilities and uses the new method of adaptive detection of Doppler frequency. The comprehensive testing was performed for measurement technique and tools. The water flow rate obtained from the universal characteristics of the turbine model was compared with the flow rate computed from the measured profiles of axial velocity. The total error in the flow rate was less than 5 %.
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