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Article

Holistic Design Approach of a Throttled Surge Tank: The Case of Refurbishment of Gondo High-Head Power Plant in Switzerland

1
Platform of Hydraulic Constructions (PL-LCH), Ecole Polytechnique Fédérale De Lausanne, 1015 Lausanne, Switzerland
2
Alpiq SA, 1003 Lausanne, Switzerland
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3440; https://doi.org/10.3390/w12123440
Received: 2 November 2020 / Revised: 3 December 2020 / Accepted: 5 December 2020 / Published: 8 December 2020
(This article belongs to the Special Issue Advances and Challenges in Hydropower)
In order to increase the installed capacity, the refurbishment of Gondo high-head power plant required a modification of the existing surge tank by installing a throttle at its entrance. In a previous study, the geometry of this throttle was optimized by physical modeling to achieve the target loss coefficients as identified by a transient 1D numerical analysis. This study complements previous analyses by means of 3D numerical modeling using the commercial software ANSYS-CFX 19 R1. Results show that: (i) a 3D computational fluid dynamics (CFD) model predicts sufficiently accurate local head loss coefficients that agree closely with the findings of the physical model; (ii) in contrast to a standard surge tank, the presence of an internal gallery in the surge tank proved to be of insignificant effect on a surge tank equipped with a throttle, as the variations in the section of the tank cause negligible local losses compared to the ones induced by the throttle; (iii) CFD investigations of transient flow regimes revealed that the head loss coefficient of the throttle only varies for flow ratios below 20% of the total flow in the system, without significantly affecting the conclusions of the 1D transient analysis with respect to minimum and maximum water level in the surge tank as well as pressure peaks below the surge tank. This study highlights the importance of examining the characteristics of a hydraulic system from a holistic approach involving hybrid modeling (1D, 3D numerical and physical) backed by calibration as well as validation with in-situ measurements. This results in a more rapid and economic design of throttled surge tanks that makes full use of the advantages associated with each modeling strategy. View Full-Text
Keywords: high head power plant; surge tank; throttle; physical modeling; 1D numerical modeling; 3D CFD modeling high head power plant; surge tank; throttle; physical modeling; 1D numerical modeling; 3D CFD modeling
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MDPI and ACS Style

Seyfeddine, M.; Vorlet, S.; Adam, N.; De Cesare, G. Holistic Design Approach of a Throttled Surge Tank: The Case of Refurbishment of Gondo High-Head Power Plant in Switzerland. Water 2020, 12, 3440. https://doi.org/10.3390/w12123440

AMA Style

Seyfeddine M, Vorlet S, Adam N, De Cesare G. Holistic Design Approach of a Throttled Surge Tank: The Case of Refurbishment of Gondo High-Head Power Plant in Switzerland. Water. 2020; 12(12):3440. https://doi.org/10.3390/w12123440

Chicago/Turabian Style

Seyfeddine, Mona; Vorlet, Samuel; Adam, Nicolas; De Cesare, Giovanni. 2020. "Holistic Design Approach of a Throttled Surge Tank: The Case of Refurbishment of Gondo High-Head Power Plant in Switzerland" Water 12, no. 12: 3440. https://doi.org/10.3390/w12123440

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