Functional sample of device used to research of nonstationary force effects
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25305034%3A_____%2F19%3AN0000003" target="_blank" >RIV/25305034:_____/19:N0000003 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Functional sample of device used to research of nonstationary force effects
Original language description
The main challenge in the pump-turbines development are hydraulic instabilities in the partial loads in both pumping and generating mode. For the mechanical design of the pump-turbine shaft and bearings, it is necessary to know the magnitude of the dynamic radial forces caused by these instabilities. The radial force magnitude is usually determined on the basis of head and the runner dimensions. The research focuses on the comparison of the empirical approach to the radial forces and the measurement on the model scale pump-turbine that was carried out in the Litostroj Engineering hydraulic laboratory in Blansko, Czech Republic. There were six strain gauges mounted on the bearing support to monitor the radial forces. In the pumping mode two distributor openings were measured. In the generating mode eight distributor openings were measured with the focus on the S-shaped curves region in the characteristic. Additionally, there were pressure gauges installed in the vaneless gap between the distributor and the runner to monitor the pressure fluctuation and potential presence of rotating stall. The appearance of rotating stall was connected to the magnitude of dynamic radial force. It was developed, designed, tested and used the functional sample of device used to research of nonstationary force effects. There were received excellent results describing dynamic behavior of pump-turbine runner in whole turbine characteristic.
Czech name
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Czech description
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Classification
Type
G<sub>funk</sub> - Functional sample
CEP classification
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OECD FORD branch
20301 - Mechanical engineering
Result continuities
Project
<a href="/en/project/TE02000232" target="_blank" >TE02000232: Special rotary machine engineering centre</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
C - Předmět řešení projektu podléhá obchodnímu tajemství (§ 504 Občanského zákoníku), ale název projektu, cíle projektu a u ukončeného nebo zastaveného projektu zhodnocení výsledku řešení projektu (údaje P03, P04, P15, P19, P29, PN8) dodané do CEP, jsou upraveny tak, aby byly zveřejnitelné.
Data specific for result type
Internal product ID
1-ENR-2-2285
Numerical identification
1-ENR-2-2285
Technical parameters
Funkční vzorek byl kalibrován na max. rozsah očekávaných radiálních sil při nestacionárních pochodech v čerpadlových turbínách. Měřením je možno popsat průběh silového působení oběžného kola v čase. Měření je možné provádět v rozsahu otáček od 0 do 2000 1/min. Fluktuace radiální síly je +-10kN.
Economical parameters
Na základě výsledků je možné vytvářet optimalizované konstrukce vodní turbíny, zejména oblasti ložisek, hřídele a labyrintu.
Application category by cost
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Owner IČO
25305034
Owner name
Litostroj Engineering a.s.
Owner country
CZ - CZECH REPUBLIC
Usage type
V - Výsledek je využíván vlastníkem
Licence fee requirement
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Web page
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