Abstract
This work deals with the experimental study of transient flow regimes occurring in the laboratory model of a hydraulic turbine draft tube at a change in the control parameters of setup. The transition from the partial load regime, when a precessing vortex core is formed, to the best efficiency point without a core is considered. To set accurately the speed of runner rotation and the flow rate of the working medium, the setup was controlled by special software. To ensure accurate multiple reproduction of a given transition cycle between two regimes, the control program has been upgraded. Using a specially developed procedure of phase averaging of a laser Doppler anemometer (LDA) signal recorded during multiple repetitions of transient regimes, the velocity profiles were obtained for different phases of changing the setup operating conditions.
References
D. Li, X. Fu, Zh. Zuo, H. Wang, Zh. Li, Sh. Liu, and X. Wei, Investigation methods for analysis of transient phenomena concerning design and operation of hydraulic-machine systems — a review, Renewable and Sustainable Energy Reviews, 2019, Vol. 101, P. 26–46.
I. Litvinov, S. Shtork, E. Gorelikov, A. Mitryakov, and K. Hanjalic, Unsteady regimes and pressure pulsations in draft tube of a model hydro turbine in a range of off-design conditions, Experimental Thermal and Fluid Sci., 2018, Vol. 91, P. 410–422.
S. Skripkin, M. Tsoy, P. Kuibin, and S. Shtork, Swirling flow in a hydraulic turbine discharge cone at different speeds and discharge conditions, Experimental Thermal and Fluid Sci., 2019, Vol. 100, P. 349–359.
A.Yu. Avdyushenko, S.G. Cherny, D.V. Chirkov, V.A. Skorospelov, and P.A. Turuk, Numerical simulation of transient processes in hydroturbines, Thermophysics and Aeromechanics, 2013, Vol. 20, No. 5, P. 577–593.
S. Houde, R. Fraser, G. Ciocan, and C. Deschênes, Experimental study of the pressure fluctuations on propeller turbine runner blades. Part 2. Transient conditions, IOP Conf Ser: Earth Environ Sci., 2012, Vol. 15, No. 6, P. 62061-1–62061-8.
I.V. Litvinov, D.K. Sharaborin, and S.I. Shtork, Finding of parameters of helical symmetry for unsteady vortex flow based on phase-averaged PIV measurement data, Thermophysics and Aeromechanics, 2015, Vol. 22, No. 5, P. 647–650.
I.V. Litvinov, D.K. Sharaborin, and S.I. Shtork, Reconstructing the structural parameters of a precessing vortex by SPIV and acoustic sensors, Experiments in Fluids, 2019, Vol. 60, Iss. 9, Article 139, 18 p.
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The work was financially supported by the Russian Foundation for Basic Research in the framework of scientific project No. 18-08-01467.
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Shtork, S.I., Suslov, D.A., Litvinov, I.V. et al. Evolution of a swirling flow in a draft tube model at transient operation regimes. Thermophys. Aeromech. 27, 153–156 (2020). https://doi.org/10.1134/S0869864320010163
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DOI: https://doi.org/10.1134/S0869864320010163