Design of Throttled Surge Tanks for High-Head Plants: Comparison of the Hydraulic Behavior of Several Throttle Types in a Straight Pipe during Pressure Wave Transmission

Prenner, Reinhard

doi:10.1061/40440(1999)11

Cited by 2 publications

(1 citation statement)

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“…10(a) shows different spacing sizes To evaluate head losses for the different throttle geometries, steady-state experiments are performed for 10 discharges. According to Prenner (1999), physical models are still efficient to evaluate steady head losses up to k ≈ 150. The relation between the head losses and the velocity head combined with the head-loss coefficient is given by…”

Section: Model Test Resultsmentioning

confidence: 99%

Design of a Throttled Surge Tank for Refurbishment by Increase of Installed Capacity at a High-Head Power Plant

Adam

Cesare

Nicolet³

et al. 2018

J. Hydraul. Eng.

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The Swiss confederation aims to phase out nuclear power production with its Energy Strategy 2050 program by increasing the renewable energy contribution to its overall energy generation. Hydroelectricity, which is the most important form of renewable energy in Switzerland, supplying almost 60% of the electricity in 2015, should increase its production capacity to achieve this goal. The case study presented in this paper focuses on the replacement of the third turbine in the Gondo high-head power plant with a turbine with a higher discharge capacity. The results of one-dimensional (1D) numerical simulations shown that throttling the surge tank is an efficient measure to adapt the existing hydraulic system for the increased discharge. Physical-scale modeling was performed to validate the design of the grid throttle placed at the bottom of the lower chamber of the existing surge tank. The grid throttle geometry and its head losses are compared with two existing similar throttles in Switzerland. Finally, prototype tests of the temporal evolution of water levels in the surge tank using the throttle coefficients obtained experimentally showed good agreement. Hybrid modeling using a combination of 1D numerical models, threedimensional (3D) physical models, and prototype tests are highly recommended for checking the transient performance of the waterway after a refurbishment of turbines with increased design discharge. Furthermore, placing a throttle at the bottom of an existing surge tank is often an effective and economical solution in the case of small increases in installed capacity.

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Section: Model Test Resultsmentioning

confidence: 99%

Design of a Throttled Surge Tank for Refurbishment by Increase of Installed Capacity at a High-Head Power Plant

Adam

Cesare

Nicolet³

et al. 2018

J. Hydraul. Eng.

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show abstract

Experimental and simulation‐based investigations on throttle’s head loss coefficients of a surge tank

Zhou

Palikhe

Cai

et al. 2020

Energy Science & Engineering

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For the different types of throttled surge tanks used in hydropower systems, it is important to comprehensively know the throttle's head loss characteristics for exact surge analysis and transient control. Herein, a general and complete experimental setup was designed to steadily reproduce the 12 typical flow regimes occurring at the surge tank and thus conduct comprehensive experimental research on throttle head loss coefficients. Furthermore, an extended mathematical model for the surge tank was derived by inputting experimental data on the throttle's head loss coefficients to surge analysis. Through experimental research, the throttle's head loss coefficients were determined by fitting formulae relative to the different flow regimes and discharge ratios; via a detailed case analysis, the differences in the head loss characteristics for different throttle types were accurately determined. It was demonstrated that the throttle's head loss coefficient varies with discharge ratio under different flow regimes and found that the experimentally obtained flow coefficients for different throttle types are more accurate and clearly reveal the difference of throttles’ head loss characteristics. The extended mathematical model for the throttled surge tank can provide more accurate simulation results and guidance for its engineering design and layout.

show abstract

Design of Throttled Surge Tanks for High-Head Plants: Comparison of the Hydraulic Behavior of Several Throttle Types in a Straight Pipe during Pressure Wave Transmission

Cited by 2 publications

References 0 publications

Design of a Throttled Surge Tank for Refurbishment by Increase of Installed Capacity at a High-Head Power Plant

Design of a Throttled Surge Tank for Refurbishment by Increase of Installed Capacity at a High-Head Power Plant

Experimental and simulation‐based investigations on throttle’s head loss coefficients of a surge tank

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