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Water hammer caused by closure of turbine safety spherical valves
Karadžić, Uroš (Avtor), Bergant, Anton (Avtor), Vukoslavčević, Petar (Avtor)

URLURL - Predstavitvena datoteka, za dostop obiščite http://iopscience.iop.org/1755-1315/12/1/012096/ Povezava se odpre v novem oknu

Izvleček
This paper investigates water hammer effects caused by closure of spherical valves against the discharge. During the first phase of modernisation of Perućica high-head hydropower plant (HPP), Montenegro, safety spherical valves(inlet turbine valves) have been refurbished on the first two Pelton turbine units. The valve closure is controlled by the valve actuator (hydraulic servomotor). Because the torque acting on the valve body is dependent on flow conditions the valve closing time may vary significantly fordifferent flow velocities (passive valve). For the passive valve the torques acting on the valve body should be considered in the valve model. The valve closing time results from numerical simulation. On the contrary, for the active valve the valve closing time is assumed prior to simulation. The spherical valve boundary condition is incorporated into the method of characteristics (MOC) algorithm. The staggered (diamond) grid in applying the MOC is used in this paper. The passive valve boundary condition is described by the water hammer equations, the valve equation that relates discharge to pressure head drop and the dynamic equation of the valve body motion (torque equation). The active valve boundary condition is described by the first two equations, respectively. Standard quasi-steady friction model is used for estimating friction losses in plants tunnel and penstocks. Numerical results using both the active and the passive spherical valve models are compared with results of measurements. It has been found that the influence of flow conditions on the spherical valve closing time is minor for the cases considered. Computed and measured results agree reasonably well.

Jezik:Angleški jezik
Ključne besede:water hammer, hydropower plant, spherical valve, method of characteristics
Vrsta gradiva:Delo ni kategorizirano (r6)
Tipologija:1.08 - Objavljeni znanstveni prispevek na konferenci
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2010
Št. strani:012096-1-012096-8
UDK:621.311:532
ISSN pri članku:1755-1315
DOI:10.1088/1755-1315/12/1/012096 Povezava se odpre v novem oknu
COBISS.SI-ID:11751707 Povezava se odpre v novem oknu
Število ogledov:933
Število prenosov:277
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Sekundarni jezik

Jezik:Angleški jezik
Ključne besede:vodni udar, hidroelektrarne, kroglasti zasun, metoda karakteristik

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