Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube
| Autor: | Daniil Suslov, I. V. Litvinov, Evgeny Gorelikov, Sergey Shtork |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Control and Optimization
Materials science transient regime 020209 energy Flow (psychology) Energy Engineering and Power Technology precessing vortex core 02 engineering and technology 01 natural sciences Turbine lcsh:Technology 010305 fluids & plasmas Draft tube Wavelet acoustic sensors 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Engineering (miscellaneous) Renewable Energy Sustainability and the Environment lcsh:T phase (conditional) averaging Aerodynamics Mechanics laser-Doppler anemometer Vortex Volumetric flow rate draft tube Transient (oscillation) Energy (miscellaneous) |
| Zdroj: | Energies, Vol 14, Iss 1240, p 1240 (2021) Energies Volume 14 Issue 5 |
| ISSN: | 1996-1073 |
| Popis: | Swirling flow with the formation of a precessing vortex core (PVC) in the draft tube model of a hydroturbine was studied. Experiments were performed on an aerodynamic setup under transient operating conditions of the hydroturbine. The turbine operating conditions were varied by continuously changing the flow rate at a constant runner speed. The transition from the partial load regime, when a precessing vortex core is formed, to the best efficiency point without a core is considered. Applied to this task, a comparison of the windowed Fourier transform with wavelet analysis is given. The dependence of the PVC lifetime in the transient regime correlates with the transient time. It is shown that the velocity profiles and the spectrum of pressure pulsations in transient regimes change quasistatically between part-load operation and the best efficiency point of the turbine. The phase-averaged velocity distributions in the transient regimes show that a transient regime is a sequence of quasisteady regimes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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