Low-frequency characteristic acoustic oscillations in the noncirculating part of a hydraulic turbine

Kurzin, V. B.

doi:10.1007/bf00852519

Cited by 2 publications

(4 citation statements)

References 2 publications

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“…These are of great importance for hydro-and gasdynamic engineering systems [11,12] and also for developing methods for the remote functional diagnosis of the cardiovascular system.…”

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confidence: 99%

On Self-Oscillations during the Outflow of a Swirled Jet

Blazhko¹,

Chefranov²

2005

Fluid Dyn

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It is shown that the core of a swirled helical flow can be described using a novel exact nonstationary solution of the hydrodynamic equations for a viscous incompressible fluid, which generalizes the rigid-body asymptotics for the Burgers and Sullivan vortices in the form of rigid-body rotation with a finite helicity. An estimate of the pressure fluctuations corresponding to this nonstationary vortex regime, which is proportional to the frequency of the swirled-jet core rotation as a rigid body and also depends on the parameters of the initial velocity field structure, is obtained. It is noted that this frequency may correspond to the frequency observed in the pressure fluctuation spectrum, which is almost proportional to the swirled flow rate in vortex acoustic emitters.

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“…These are of great importance for hydro-and gasdynamic engineering systems [11,12] and also for developing methods for the remote functional diagnosis of the cardiovascular system.…”

mentioning

confidence: 99%

On Self-Oscillations during the Outflow of a Swirled Jet

Blazhko¹,

Chefranov²

2005

Fluid Dyn

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“…The laws of conservation of mass and acoustic energy are used in [3] to match the solutions in the subdomains. The second law is formulated as a nonlinear relation of the parameters of acoustic oscillations, where the abovementioned processes are partly taken into account.…”

Section: Effect Of Nonlinearity On the Character Of Hydroacousticmentioning

confidence: 99%

“…1. The activities described in [2][3][4][5] were performed to find the reasons for the increased level of these vibrations.…”

mentioning

confidence: 99%

“…According to [2][3][4][5], the increase in the level of turbine vibrations on the Sayano-Shushensk HPP is caused by the influence of fluid compressibility. As a compressible fluid can perform its natural hydroacoustic oscillations in the turbine duct, the unsteady hydrodynamic forces acting on the turbine can be substantially enhanced if the frequency of the hydroacoustic oscillations of the fluid is close to the frequency of the forced vibrations.…”

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confidence: 99%

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Mechanism of emergence of intense vibrations of turbines on the Sayano-Shushensk hydro power plant

Kurzin

Селезнев

2010

J Appl Mech Tech Phy

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ON THE SAYANO-SHUSHENSK HYDRO POWER PLANT UDC 621.51:534 V. B. Kurzin and V. S. Seleznev It is demonstrated that the level of vibrations of turbines on the Sayano-Shushensk hydro power plant is enhanced by the capability of a compressible fluid to perform its own hydroacoustic oscillations (which can be unstable) in the turbine duct. Based on the previously obtained results of solving the problem of natural hydroacoustic oscillations in the turbine duct and some ideas about turbine interaction with an unsteady compressible fluid flow, results of full-scale studies of turbine vibrations and seismic monitoring of the dam of the Sayano-Shushensk hydro power plant before and during the accident are analyzed.Introduction. Various possible reasons were given after the accident on the Sayano-Shushensk hydro power plant (HPP), which happened on August 17, 2009. These reasons were analyzed in much detail in [1]. Some versions of the accident are based on the assumption that the turbine was subjected to a certain pulsed high-power action (something like a hydraulic hammer), which exceeded the safety margin of the structure. These versions, however, do not agree with the results of seismic monitoring of the dam of the Sayano-Shushensk HPP before and during the accident. The main reason for the accident is assumed to be the fatigue failure of the fixtures of the turbine cover of the power-generating unit No. 2, which was induced by the high level of turbine vibrations in the standard operation mode. This fact was established by the technical commission investigating the reasons for the accident.The elevated level of turbine vibrations on the Sayano-Shushensk HPP (as compared with vibrations obtained for its model) was observed in full-scale tests performed back in 1988. It was shown [2, 3] that emergence of such vibrations is caused by the effect of water compressibility on turbine interaction with the unsteady flow, which was ignored in design of the Sayano-Shushensk HPP. The study of this problem was continued in [4,5]. Based on results of these studies, certain restrictions were imposed on operation of power-generating units of the Sayano-Shushensk HPP. It should be noted, however, that the hydrodynamic problem in [4,5] (results of these studies were used as a basis for the version described in [1]) was considered in a linear formulation and in a quasi-steady approximation. It is convenient to use the solution of this problem in such a formulation for engineering calculations, but the solution is rather rough and does not explain some qualitative features observed in experiments. In addition, there is a mistake in [4,5].In the present work, based on the theory of cascades in an unsteady flow [6-8] and on the laws of aeroacoustics, we study the qualitative effect of nonlinearity and reduced frequency of vibrations on turbine interaction with an unsteady compressible fluid flow, which was partly taken into account in [2, 3], but skipped in [4,5]. Using the data obtained, we analyze the results of full-scale studies of turbi...

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Low-frequency characteristic acoustic oscillations in the noncirculating part of a hydraulic turbine

Cited by 2 publications

References 2 publications

On Self-Oscillations during the Outflow of a Swirled Jet

On Self-Oscillations during the Outflow of a Swirled Jet

Mechanism of emergence of intense vibrations of turbines on the Sayano-Shushensk hydro power plant

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