TY - JOUR
T1 - Optimization methodology assessment for the inlet velocity profile of a hydraulic turbine draft tube
T2 - Part i - Computer optimization techniques
AU - Galván, Sergio
AU - Rubio, Carlos
AU - Pacheco, Jesús
AU - Mendoza, Crisanto
AU - Toledo, Miguel
PY - 2013/1
Y1 - 2013/1
N2 - In recent years, numerical and experimental investigations on the draft tube performance have confirmed the importance of the inlet swirling flow created by the runner vanes. The results indicate that it is still a challenge to get the optimal flow distribution at the draft tube inlet which gives the best machine performance over a range of operation points. Consequently, there is a need to adjust the runner-draft tube coupling to minimize the losses arising from the inlet flow distribution. This paper focus on establishing an optimization methodology for maximizing the draft tube performance as a function of the inlet velocity profile. The overall work is divides into two parts: The part one establish the inlet velocity parametrization, the numerical optimization set-up and the objective function definition. The part two validate the numerical CFD draft tube model. These steps are represented by the coupling of the commercial softwares MATLAB, FLUENT and iSIGHT. It is considered that this proved methodology will help to find a inlet velocity profile shape which will be able to suppress or mitigate the undesirable draft tube flow characteristics.
AB - In recent years, numerical and experimental investigations on the draft tube performance have confirmed the importance of the inlet swirling flow created by the runner vanes. The results indicate that it is still a challenge to get the optimal flow distribution at the draft tube inlet which gives the best machine performance over a range of operation points. Consequently, there is a need to adjust the runner-draft tube coupling to minimize the losses arising from the inlet flow distribution. This paper focus on establishing an optimization methodology for maximizing the draft tube performance as a function of the inlet velocity profile. The overall work is divides into two parts: The part one establish the inlet velocity parametrization, the numerical optimization set-up and the objective function definition. The part two validate the numerical CFD draft tube model. These steps are represented by the coupling of the commercial softwares MATLAB, FLUENT and iSIGHT. It is considered that this proved methodology will help to find a inlet velocity profile shape which will be able to suppress or mitigate the undesirable draft tube flow characteristics.
KW - CFD
KW - Draft tube
KW - Hydraulic turbine
KW - Optimization algorithms
UR - http://www.scopus.com/inward/record.url?scp=84872615978&partnerID=8YFLogxK
U2 - 10.1007/s10898-012-9946-8
DO - 10.1007/s10898-012-9946-8
M3 - Artículo
SN - 0925-5001
VL - 55
SP - 53
EP - 72
JO - Journal of Global Optimization
JF - Journal of Global Optimization
IS - 1
ER -