Saint Petersburg, Russia

Leningradsky Metallichesky Zavod
Saint Petersburg, Russia

Leningradsky Metallichesky Zavod , also known as LMZ, is the largest Russian manufacturer of power machines and turbines for electric power stations. Wikipedia.

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Sonin V.,Leningradsky Metallichesky Zavod | Ustimenko A.,Leningradsky Metallichesky Zavod | Kuibin P.,RAS Institute of Thermophysics | Litvinov I.,Novosibirsk State University | Shtork S.,Novosibirsk State University
IOP Conference Series: Earth and Environmental Science | Year: 2016

One of the mechanisms of generation of powerful pressure pulsations in the circuit of the turbine is a precessing vortex core, formed behind the runner at the operation points with partial or forced loads, when the flow has significant residual swirl. To study periodic pressure pulsations behind the runner the authors of this paper use approaches of experimental modeling and methods of computational fluid dynamics. The influence of velocity distributions at the output of the hydro turbine runner on pressure pulsations was studied based on analysis of the existing and possible velocity distributions in hydraulic turbines and selection of the distribution in the extended range. Preliminary numerical calculations have showed that the velocity distribution can be modeled without reproduction of the entire geometry of the circuit, using a combination of two blade cascades of the rotor and stator. Experimental verification of numerical results was carried out in an air bench, using the method of 3D-printing for fabrication of the blade cascades and the geometry of the draft tube of hydraulic turbine. Measurements of the velocity field at the input to a draft tube cone and registration of pressure pulsations due to precessing vortex core have allowed building correlations between the velocity distribution character and the amplitude-frequency characteristics of the pulsations.

Alekseenko S.V.,RAS Kutateladze Institute of Thermophysics | Kuibin P.A.,RAS Kutateladze Institute of Thermophysics | Shtork S.I.,RAS Kutateladze Institute of Thermophysics | Skripkin S.G.,RAS Kutateladze Institute of Thermophysics | And 3 more authors.
IOP Conference Series: Earth and Environmental Science | Year: 2016

The swirling flow in the discharge cone of hydroturbine is characterized by various self-induced instabilities and associated low frequency phenomena when the turbine is operated far from the best efficiency point. In particular, the precessing vortex rope develops at part-load regimes in the draft tube. This rope can serve a reason of the periodical low- frequency pressure oscillations in the whole hydrodynamical system. During the experimental research of flow structure in the discharge cone in a regime of free runner new interesting phenomenon was discovered. Due to instability some coils of helical vortex close to each other and reconnection appears with generation of a vortex ring. The experiments were fulfilled at the cavitational conditions when a cavity arises in the vortex core. So the phenomenon was registered with help of visualization by the high speed video recording. The vortex ring after the reconnection moves apart from the main vortex rope toward the wall and downstream. When it reaches the area with high pressure the cavity collapses with generation of pressure impact. The mechanism of cavitational vortex rings generation and their further collapse can serve as a prototype of the aperiodical pressure impacts inside the turbine draft tube.

Kuibin P.A.,RAS Kutateladze Institute of Thermophysics | Pylev I.M.,Leningradsky Metallichesky Zavod | Zakharov A.V.,Leningradsky Metallichesky Zavod
IOP Conference Series: Earth and Environmental Science | Year: 2012

For Francis turbines operating at part load or over load a swirl flow arises behind the runner. Due to instability and/or asymmetry of the spiral casing a helical-like vortex rope appears in the draft tube. The goal of the present paper is to develop models of cavitating vortex rope and to evaluate influence of the gas/vapor phase on the pressure pulsation in the turbine draft tube and on the hydroacoustic characteristics of the system as a whole. © Published under licence by IOP Publishing Ltd.

Ivanov S.A.,Leningradsky Metallichesky Zavod | Tsvetkov K.O.,Leningradsky Metallichesky Zavod
Power Technology and Engineering | Year: 2015

Based on many years of successful experience in developing and operating supercritical steam turbines with powers of 300 – 1200 MWand an analysis of advances in competing ultrasupercritical turbines, the firm JSC “Power Machines” has developed a 660 MWultrasupercritical steam turbine. The basic engineering solutions applied to the model K-660-26,5 turbine will be used to build a series of 500 – 1200 MW turbines with ultrasupercritical steam parameters. © 2015 Springer Science+Business Media New York

Borichanskii K.N.,Leningradsky Metallichesky Zavod | Grigorev B.E.,Leningradsky Metallichesky Zavod | Grigorev S.Yu.,Leningradsky Metallichesky Zavod | Naumov A.V.,Leningradsky Metallichesky Zavod
Power Technology and Engineering | Year: 2011

Aspects of the vibrational state of blades and shaft lines during transitional operation of high-power steam turbines are examined. Measurements are made using a modernized version of the discrete phase method. It is shown that synchronization and load resetting do not lead to dangerous dynamical stresses in the blades and shaft components. © 2011 Springer Science + Business Media, Inc.

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