Pregled bibliografske jedinice broj: 1084314
Analysis of transients in francis turbine using fourier methods
Analysis of transients in francis turbine using fourier methods // AIAA Scitech 2019 Forum
San Diego (CA), Sjedinjene Američke Države, 2019. (predavanje, međunarodna recenzija, cjeloviti rad (in extenso), znanstveni)
CROSBI ID: 1084314 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Analysis of transients in francis turbine using fourier methods
Autori
Cvijetić, Gregor ; Čulić, Luka ; Jasak, Hrvoje
Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni
Skup
AIAA Scitech 2019 Forum
Mjesto i datum
San Diego (CA), Sjedinjene Američke Države, 07.01.2019. - 11.01.2019
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
Harmonic Balance, OpenFOAM, Water Turbine
Sažetak
The Harmonic Balance application for transients in water turbines is presented in this paper. The incompressible segregated pressure-based algorithm is deployed for simulations of turbine shut-down and start-up process. The process is investigated through a number of operating points on start-up/shut-down curve. In order to be able to use the Harmonic Balance method for transient process, a periodic behavior is presumed, where a single pe- riod consists both of start-up and shut-down, rather than just a single transient occurrence. Therefore, the two regime changes are investigated simultaneously. The Harmonic Balance method is based on the Fourier series transformation, defining that the number of equa- tions solved, as well as temporal resolution depend on the number of harmonics prescribed. For n harmonics 2n+1 equation sets are solved, whereas in case of start-up/shut- down sim- ulations, a sufficiently large number of harmonics have to be chosen in order to accurately represent the process. In this work the Francis turbine is simulated with opening and closing guide vanes during start-up/shut-down. A number of meshes have been prepared for corresponding points in time with corresponding guide vane angle. In order to sim- plify the preparation, the period is symmetrical, therefore the meshes with same guide vane positions are used both for start-up and shut- down. Final 2n + 1 time instants are interconnected and reconstructed using the two stage Harmonic Balance technique and the behavior during the whole period is obtained.
Izvorni jezik
Engleski
Znanstvena područja
Strojarstvo
