Constraints of Parametrically Defined Guide Vanes for a High-Head Francis Turbine

Stojkovski, Filip; Lazarevikj, Marija; Markov, Zoran; Iliev, Igor; Dahlhaug, Ole Gunnar

doi:10.3390/en14092667

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…The numerical results were compared with experimental results, showing good conformity. Research by Stojkovski et al (2021) is to understand A parametric design tool with normalized geometrical constraints was created in MATLAB, suitable for generating guide vane cascade geometries for Francis turbines. The goal is to determine the limits of these constraints, which will lead to future faster prediction of initial guide vane configurations in the turbine optimal operating region.…”

Section: Literature Reviewmentioning

confidence: 99%

New Design of A Micro-Hydro Power Plant (MHPP) System In The 3T Region As Al-ternative Solution Unit Turbine Using Computational Fluid Dynamics (CFD) Simulation

Jarrar Pirzada,

Kurniawan,

Nababan

et al. 2024

Eduvest

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This research aims to select the most suitable type of water turbine for the micro-hydro power plant (PLTMH) site in the Anggi District, Pegunungan Arfak Regency, West Papua Province. The study also aims to design the most optimal and effective turbine in terms of technical aspects and generator system reliability. This objective is directed towards providing recommendations for the development of the second unit of PLTMH Anggi in a more comprehensive manner rather than relying solely on expert recommendations without thorough analysis. The data used in this research was obtained from field surveys and secondary data sources. The initial step in selecting the turbine type involves manual turbine design calculations, taking into consideration parameters such as water flow, head height, and hydraulic efficiency. Based on these calculation results, the "Francis" turbine type was chosen as the preferred option, differing from the existing Propeller Tubular Type-S turbine installed in Unit 1. The selected turbine, "Francis," was then modeled using computational fluid dynamics (CFD) simulations with the Ansys Fluent software. These simulations provide computer-generated data on hydrodynamic characteristics, pressure distribution, and flow velocity around the turbine under various operational conditions. This research has significant implications for improving the efficiency and reliability of the micro-hydro power plant system for the optimal power and efficiency development of Unit 2.

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Section: Literature Reviewmentioning

confidence: 99%

New Design of A Micro-Hydro Power Plant (MHPP) System In The 3T Region As Al-ternative Solution Unit Turbine Using Computational Fluid Dynamics (CFD) Simulation

Jarrar Pirzada,

Kurniawan,

Nababan

et al. 2024

Eduvest

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“…All geometric sizes of the cascade are derived from the axis of rotation of the turbine [7]. All individual listed geometric parameters in the further context are combined in order to obtain dimensionless quantities, i.e.…”

Section: Referent Turbine Description and Guide Vanes Geometric Param...mentioning

confidence: 99%

“…In the human controlled design procedure and analysis, this parameter was left as free, to search the best enclosure angle. Chord line length L represents the blade length and depending on the adopted number of blades in the cascade Z gv , the parameter of cascade density is derived [-]: (7) As the cascade density is a relative parameter, it is used to develop different blade lengths, as the outlet circumference radius and the number of blades is kept constant for the turbine model. The inlet circle of the guide vanes is calculated using the Pythagorean Theorem from the projections of the length of the chord line along the x and y-axes and the outlet radius:…”

Section: Referent Turbine Description and Guide Vanes Geometric Param...mentioning

confidence: 99%

Optimization of guide vanes for variable speed Francis turbines – Human controlled vs. automated approach

Stojkovski

Markov

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Guide vanes of hydraulic turbines can maximise turbine efficiency and directly influence on turbine operating characteristics. A hydraulic analysis is carried out on geometrically parameterised guide vane foils, to maximise efficiency and potentially observe which configuration gives operating range expansion. Variable-speed operated turbines in hydropower plants tend to run with improved performance at off-design operating points due to the speed variations. A combination of variable speed turbine operation and guide vane shape optimization gives a win-win situation in water to energy usage ratio. Human controlled developed designs and CFD calculations were previously done. The obtained results are compared with automated approach in ANSYS Workbench using Design of Experiments. The numerical tests were made on parametrically developed guide vane cascades, where the turbine efficiency is the evaluated parameter and it is observed in the range of several rotational speeds and calculated flow rates. The cascade design which produces less turbine efficiency deviations for the tested rotational speed range is later exported and hydraulically and geometrically compared with the developed design from the manual approach. The tested configurations of the guide vanes are developed on the basis of Francis 99 turbine model from the Waterpower Laboratory at the Norwegian University of Science and Technology in the existing geometric space for the guide vanes and blades axis positioning circumference.

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“…Here, too, adaptability is realized by pivoting guide vanes in the nozzle ring. In contrast to the nozzle ring, the Francis turbine rotor remains unchanged in geometry [19][20][21]. Pivoting guide vanes are also applied for controlling Kaplan turbines.…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of an Adaptive Supersonic Micro Turbine for Waste Heat Recovery Applications

et al. 2021

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Micro turbines (<100 kWel) are commercially used as expansion machines in waste heat recovery (WHR) systems such as organic Rankine cycles (ORCs). These highly loaded turbines are generally designed for a specific parameter set, and their isentropic expansion efficiency significantly deteriorates when the mass flow rate of the WHR system deviates from the design point. However, in numerous industry processes that are potentially interesting for the implementation of a WHR process, the temperature, mass flow rate or both can fluctuate significantly, resulting in fluctuations in the WHR system as well. In such circumstances, the inlet pressure of the ORC turbine, and therefore the reversible cycle efficiency must be significantly reduced during these fluctuations. In this context, the authors developed an adaptive supersonic micro turbine for WHR applications. The variable geometry of the turbine nozzles enables an adjustment of the swallowing capacity in respect of the available mass flow rate in order to keep the upper cycle pressure constant. In this paper, an experimental test series of a WHR ORC test rig equipped with the developed adaptive supersonic micro turbine is analysed. The adaptive turbine is characterized concerning its off-design performance and the results are compared to a reference turbine with fixed geometry. To create a fair data basis for this comparison, a digital twin of the plant based on experimental data was built. In addition to the characterization of the turbine itself, the influence of the improved pressure ratio on the energy conversion chain of the entire ORC is analysed.

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Constraints of Parametrically Defined Guide Vanes for a High-Head Francis Turbine

Cited by 5 publications

References 10 publications

New Design of A Micro-Hydro Power Plant (MHPP) System In The 3T Region As Al-ternative Solution Unit Turbine Using Computational Fluid Dynamics (CFD) Simulation

New Design of A Micro-Hydro Power Plant (MHPP) System In The 3T Region As Al-ternative Solution Unit Turbine Using Computational Fluid Dynamics (CFD) Simulation

Optimization of guide vanes for variable speed Francis turbines – Human controlled vs. automated approach

Experimental Characterization of an Adaptive Supersonic Micro Turbine for Waste Heat Recovery Applications

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