Naslov
Validation of the harmonic balance solver for turbomachinery start- up and shut-down simulations

Autori
Ćulić, Luka

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, diplomski

Fakultet
Fakultet strojarstva i brodogradnje

Mjesto
Zagreb

Datum
28.03

Godina
2018

Stranica
91

Mentor
Jasak, Hrvoje

Ključne riječi
CFD ; foam-extend ; Harmonic Balance Method ; Francis turbine ; Transient flow ; Start-up ; Shut-down

Sažetak
This thesis investigates different turbomachinery flow regimes and transient behavior during regime change. One of the main reasons why turbomachinery is working in the different flow regimes are changes in the global electricity market. Global incitation for alternative, renewable and sustainable energy, such as wind and solar energy, has increased grid disruption because solar panel, wind turbines, etc., do not produce electricity according to demand. The volatility of the electric grid needs to be reduced and it is most often regulated by changing the flow regime in the hydro-power plant. This has resulted in frequent load variations in turbines and as a consequence shorter operating life. In order to adjust turbines to this new regime of work, fluid flow during whole transient period needs to be calculated and predicted. Simulating the complete transient period with available methods, is too expensive for industrial applications and therefore the Harmonic Balance method for transient flows is developed. In this thesis mathematical model and Harmonic Balance method will be presented. Furthermore, a novel approach to calculate changing flow regimes is presented. At the end, experimental results obtained as a part of the Francis 99 workshop will be compared with obtained numerical results in order to evaluate the method for turbine start-up and shut-down application.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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