Study of the velocity distribution influence upon the pressure pulsations in draft tube model of hydro-turbine

Sonin, V. I.; Ustimenko, A. S.; Куйбин, П. А.; Litvinov, I. V.; Шторк, С. И.

doi:10.1088/1755-1315/49/8/082020

Cited by 17 publications

(12 citation statements)

References 14 publications

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“…This makes it possible to simulate the velocity distribution at the inlet of the draft tube model that coincides with the velocity distribution at the inlet of the full-scale turbine draft tube [24][25][26]. The blades were designed so as to provide optimum performance of Francis hydraulic turbines [27] (Best Efficiency Point, BEP), which for the scale of the given test section, corresponds to a volumetric flow rate Q c = 0.049 m 3 /s and a speed of the clockwise rotating runner n c = 2432 rpm. Some parts of the setup were created using a 3D printer, which allows a quick and accurate reproduction of the complex geometric boundary conditions in the test section.…”

Section: Methodsmentioning

confidence: 99%

Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube

et al. 2021

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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.

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Section: Methodsmentioning

confidence: 99%

Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube

et al. 2021

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“…1) consists of a series of fixed and rotating blade swirlers. The geometric shape of the blade swirlers and the order of their location allows simulating the speed distribution at the output of a real hydraulic turbine [10]. The rotating swirler is driven through a shaft connected to a servo drive.…”

Section: Methodsmentioning

confidence: 99%

The swirl number as a method for determining the optimal operating mode of the micro hydro turbine

Суслов

Litvinov

Gorelikov

et al. 2021

J. Phys.: Conf. Ser.

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The paper presents the data of a detailed study of the flow characteristics behind the runner of an air model of a propeller-type micro hydro turbine with varying operating modes from partial load to severe overload. Detailed measurements of the flow field distributions were carried out using an automated system for contactless optical diagnostics (LDA). The obtained data made it possible to link the identified features of the development of the flow structure when changing the operating mode of the installation with the nature of the evolution of the integral swirl number that determines the state of the swirled flow. Eventually, the work results can be used in the elaboration of recommendations for extending the regulation range of the operating regimes of hydraulic microturbines and providing their high efficiency.

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“…However, in contrast to those studies, which used a freely rotating impeller, here the rotor speed is controlled by the servomotor at a specified frequency. The geometry of the swirlers was determined by numerical simulation, targeted to reproduce best the velocity distributions at the draft tube inlet for different operating modes of a radial-axial Francis hydro turbine [7,8]. On the basis of the calculated geometry, the physical models of the swirler pairs were fabricated using 3-d printing.…”

Section: Introductionmentioning

confidence: 99%

Regimes with periodical pressure pulsation in Francis draft tube

2017

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Abstract. The paper reports on results of the experimental study of flow and pressure pulsations in a laboratory model of the draft tube of Francis-99 hydro turbine over a broad range of operating regimes. A novelty is the rapid prototyping and 3-d printing of the inflow swirl generators that makes it possible to acquire rapidly a large amount of experimental data for a variety of designs and operating conditions. The frequency characteristics of flow and the phase-average pressure distribution in draft tube cone have been measured with the aid of special acoustic sensors.

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Study of the velocity distribution influence upon the pressure pulsations in draft tube model of hydro-turbine

Cited by 17 publications

References 14 publications

Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube

Experimental Study of Transient Flow Regimes in a Model Hydroturbine Draft Tube

The swirl number as a method for determining the optimal operating mode of the micro hydro turbine

Regimes with periodical pressure pulsation in Francis draft tube

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