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Статті в журналах з теми "Hydraulic turbines Models"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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1

Shi, Feng Xia, Jun Hu Yang, and Xiao Hui Wang. "Effect of Rotating Speed on Hydraulic Energy Recovery Turbines Performance." Applied Mechanics and Materials 444-445 (October 2013): 1033–37. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.1033.

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Анотація:

In order to forecast the rotating speed of the hydraulic energy recovery turbine, Single centrifugal pump and single centrifugal pump with guide vane in reverse operation were adopted as turbines. 3D models were founded by pro/E software for turbines, Then the models were meshed by gambit and Simulated by fluent6.3 software. It was shown that before the best efficiency points, The higher the rotating speed, the lower the efficiency of turbine . but after the best efficiency points, the efficiency of turbine increased with the rise of rotating speed. with the rise of rotating speed ,the pressur

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2

Zharkovskiy, A. A., V. A. Shchur, M. Omran, and A. A. Staseyev. "Automation of the design of the impeller of a radial-axial hydraulic turbine." Izvestiya MGTU MAMI 15, no. 4 (2021): 18–26. http://dx.doi.org/10.31992/2074-0530-2021-50-4-18-26.

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The article describes approaches to the design of a vane system of radial-axial hydraulic turbines based on an automated design system developed at SPbPU using the Python programming language. The specified system currently includes the following modules: selection of the main parameters of the hydraulic turbine, construction of the meridional projection of the impeller, calculation of the potential flow and construction of the blade system of the radial-axial hydraulic turbine. The choice of the main parameters of the hydraulic turbine is based on the technique generally accepted in hydraulic

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3

Ayancik, Fatma, Erdem Acar, Kutay Celebioglu, and Selin Aradag. "Simulation-based design and optimization of Francis turbine runners by using multiple types of metamodels." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 8 (2016): 1427–44. http://dx.doi.org/10.1177/0954406216658078.

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In recent years, optimization started to become popular in several engineering disciplines such as aerospace, automotive and turbomachinery. Optimization is also a powerful tool in hydraulic turbine industry to find the best performance of turbines and their sub-elements. However, direct application of the optimization techniques in design of hydraulic turbines is impractical due to the requirement of performing computationally expensive analysis of turbines many times during optimization. Metamodels (or surrogate models) that can provide fast response predictions and mimic the behavior of non

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4

Martineau Rousseau, Philippe, Azzeddine Soulaïmani, and Michel Sabourin. "Efficiency Assessment for Rehabilitated Francis Turbines Using URANS Simulations." Water 13, no. 14 (2021): 1883. http://dx.doi.org/10.3390/w13141883.

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Due to the large number of aging hydraulic turbines in North America, rehabilitation is a growing market as these turbines have low efficiency compared to modern ones. Computational Fluid Dynamics identifies components with poor hydraulic performance. The models often used in industry are based on individually analyzing the sub-components of a turbine instead of full turbine simulations due to computational and time limitations. An industrial case has shown that such analyses may lead to underestimating the efficiency increases by modifying the stay vane. The unsteady full turbine simulation p

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5

Seifollahi Moghadam, Zahra, François Guibault, and André Garon. "On the Evaluation of Mesh Resolution for Large-Eddy Simulation of Internal Flows Using Openfoam." Fluids 6, no. 1 (2021): 24. http://dx.doi.org/10.3390/fluids6010024.

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The central aim of this paper is to use OpenFOAM for the assessment of mesh resolution requirements for large-eddy simulation (LES) of flows similar to the ones which occur inside the draft-tube of hydraulic turbines at off-design operating conditions. The importance of this study is related to the fact that hydraulic turbines often need to be operated over an extended range of operating conditions, which makes the investigation of fluctuating stresses crucial. Scale-resolving simulation (SRS) approaches, such as LES and detached-eddy simulation (DES), have received more interests in the recen

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6

Skripkin, Sergey, Mikhail Tsoy, and Sergey Shtork. "Experimental Investigation Of Double Precessing Vortex Rope Forming In Draft Tube Models." Siberian Journal of Physics 10, no. 2 (2015): 73–82. http://dx.doi.org/10.54362/1818-7919-2015-10-2-73-82.

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This work is devoted to the experimental research of the flow structure in draft tube models of hydro turbines. Precessing vortex core was formed using fixed swirler in a flow such as observed in natural hydro turbines under off-design conditions. In laboratory conditions it has been able to find the effect of the transition between single- and double- vortex rope. Their frequency characteristics have been measured in the range of Reynolds numbers 5·104 –5·105 . Based on the analysis of data high-speed shooting the mechanism of complete transition between single and double vortex modes was inv

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7

Šiško Kuliš, Marija, Nikola Mijalić, and Senad Hidžić. "Cavitation Detection on Hydraulic Machines." Journal of Energy - Energija 70, no. 3 (2022): 25–32. http://dx.doi.org/10.37798/202170328.

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This paper gives an engineering review of the phenomenon of cavitation on hydraulic machines: turbines, pumps and ships propellers. The types of cavitation and its consequences are presented by the cabinet study of the results of relevant researches on models and real plants. In the special focus of this paper are the techniques of exploration of cavitation erosion: visual examination, measurements of pressures and vibrations and CFD methods.

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8

McKinnon, Conor, James Carroll, Alasdair McDonald, Sofia Koukoura, and Charlie Plumley. "Investigation of Isolation Forest for Wind Turbine Pitch System Condition Monitoring Using SCADA Data." Energies 14, no. 20 (2021): 6601. http://dx.doi.org/10.3390/en14206601.

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Wind turbine pitch system condition monitoring is an active area of research, and this paper investigates the use of the Isolation Forest Machine Learning model and Supervisory Control and Data Acquisition system data for this task. This paper examines two case studies, turbines with hydraulic or electric pitch systems, and uses an Isolation Forest to predict failure ahead of time. This novel technique compared several models per turbine, each trained on a different number of months of data. An anomaly proportion for three different time-series window lengths was compared, to observe trends an

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9

McKinnon, Conor, James Carroll, Alasdair McDonald, Sofia Koukoura, and Charlie Plumley. "Investigation of Isolation Forest for Wind Turbine Pitch System Condition Monitoring Using SCADA Data." Energies 14, no. 20 (2021): 6601. http://dx.doi.org/10.3390/en14206601.

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Анотація:

Wind turbine pitch system condition monitoring is an active area of research, and this paper investigates the use of the Isolation Forest Machine Learning model and Supervisory Control and Data Acquisition system data for this task. This paper examines two case studies, turbines with hydraulic or electric pitch systems, and uses an Isolation Forest to predict failure ahead of time. This novel technique compared several models per turbine, each trained on a different number of months of data. An anomaly proportion for three different time-series window lengths was compared, to observe trends an

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10

Purece, Cristian, Vasile Pleşca, and Lilica Corlan. "Technologies for obtaining energy from micro-hydropower resources." Technium: Romanian Journal of Applied Sciences and Technology 2, no. 4 (2020): 124–33. http://dx.doi.org/10.47577/technium.v2i4.837.

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Currently the global demand for electricity and drinking water is constantly increasing. Given its many economic, social and environmental benefits, hydro energy will be an important contributor to the energy mix of the future. Isolated areas, heavily underdeveloped regions, disaster-affected areas have a common need of easy-to-use means to generate electricity. The most efficient way to meet these needs involves the use of various renewable energy resources available locally. One of the main sources of renewable energy is hydro energy, more specifically micro-hydro energy. However, hydropower

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11

Hamarasheed, Chalang, Sallehuddin Mohamed Haris, and Zulkifli Mohd Nopiah. "Weighted Multiple Model Adaptive PID Control with Crossover Frequency Shift Tuning for a Hydraulic Turbine Plant." Applied Mechanics and Materials 278-280 (January 2013): 1644–47. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.1644.

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Hydraulic turbines are known to have complex and highly nonlinear dynamics with some varying parameters, especially in the presence of large or abrupt disturbances. In this study, the weighted multiple model adaptive control scheme was used as a controller for a hydraulic turbine model, with the aim of providing desirable characteristics such as robustness and stability. The system of comprised four candidate plant models with four corresponding candidate PID controllers which were tuned according to the phase shifting method. The plant operation, subjected to both abruptly changing and smooth

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12

Madeira, Filipe C., João F. P. Fernandes, Modesto Pérez-Sánchez, P. Amparo López-Jiménez, Helena M. Ramos, and P. J. Costa Branco. "Electro-Hydraulic Transient Regimes in Isolated Pumps Working as Turbines with Self-Excited Induction Generators." Energies 13, no. 17 (2020): 4521. http://dx.doi.org/10.3390/en13174521.

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The use of pumps working as turbines (PATs) is a sustainable technical measure that contributes to the improvement of energy efficiency in water systems. However, its performance analysis in off-grid recovery systems is a complex task that must consider both hydraulic (PAT) and electrical machines (typically a self-excited induction generator-SEIG). Aside from several kinds of research that analyze the PAT-SEIG behavior under steady-state constant hydraulic and electrical conditions, this research focuses on the analysis of PAT-SEIG transient regimes, by analyzing their variation when a sudden

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13

Moraga, G., C. Valero, D. Valentín, et al. "Characterization of the Fluid Damping in Simplified Models of Pump-Turbines and High Head Francis Runners." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (2022): 012091. http://dx.doi.org/10.1088/1755-1315/1079/1/012091.

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Abstract In order to satisfy the power demand in the electrical grid, hydraulic turbine units frequently work under off-design operation conditions and pass through transient events. These operation conditions can lead to high vibration amplitudes in the turbine runners, decreasing their useful life, and in some cases to premature failures. To determine and to understand the behaviour of the fluid damping is a relevant topic, because this parameter limits the maximum amplitude in resonance conditions. The runner of some types of turbines, such as reversible pump-turbine and high head Francis t

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14

Poteraş, George, György Deák, Iasmina-Florina Burlacu, Simona Natalia Raischi, and Violeta-Monica Radu. "Use of the bio-engineering technologies in the construction and upgrade of complex installations for obtaining energy from three renewable sources. Complex installations for flowing waters." E3S Web of Conferences 239 (2021): 00009. http://dx.doi.org/10.1051/e3sconf/202123900009.

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In the context of the sustainable development, the problem of the widespread use of renewable energy resources, which are clean and inexhaustible, is becoming more acute. In this regard, it is necessary to develop some capture installations that use renewable energy sources as efficiently as possible and with low impact on the environment. This paper presents a patented installation that integrates three sources of renewable energy: wind energy, solar energy and hydraulic energy of water current. The efficiency of this complex installation is given by the fact that the simultaneous capitalizat

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15

Stammler, Matthias, Fabian Schwack, Norbert Bader, Andreas Reuter, and Gerhard Poll. "Friction torque of wind-turbine pitch bearings – comparison of experimental results with available models." Wind Energy Science 3, no. 1 (2018): 97–105. http://dx.doi.org/10.5194/wes-3-97-2018.

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Abstract. Pitch bearings of wind turbines are large, grease-lubricated rolling bearings that connect the rotor blades with the rotor hub. They are used to turn the rotor blades to control the power output and/or structural loads of the turbine. Common actuators turning the blades are hydraulic cylinders or electrical motor–gearbox combinations. In order to design pitch actuator systems that are able to turn the blades reliably without imposing an excessive power demand, it is necessary to predict the friction torque of pitch bearings for different operating conditions. In this paper, the resul

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16

Georgievskaia, E. V. "APPLICATION OF BREAKDOWN MECHANICS FOR PREDICTING THE RESOURCE OF AXIAL RADIAL HYDROTURBINS." Proceedings of the higher educational institutions. ENERGY SECTOR PROBLEMS 20, no. 9-10 (2019): 71–78. http://dx.doi.org/10.30724/1998-9903-2018-20-9-10-71-78.

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To plan for timely reconstruction, modernization, repairs or replacement of equipment it is important to reliably predict the instant of its transition to the limiting state that determines the lifetime. Currently, there are no regulatory methods for assessing the lifetime of hydraulic turbines at the operation stage. The approach presented in this paper uses the fracture mechanics methods to build a long-term individual forecast of the dangerous development defects in the main elements of hydraulic turbines taking into account design, technological and operational features. The forecast is ba

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17

Unterluggauer, Julian, Anton Maly, and Eduard Doujak. "Investigation on the Impact of Air Admission in a Prototype Francis Turbine at Low-Load Operation." Energies 12, no. 15 (2019): 2893. http://dx.doi.org/10.3390/en12152893.

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Due to significant changes in the energy system, hydraulic turbines are required to operate over a wide power range. In particular, older turbines which are not designed for these environments will suffer under off-design conditions. In order to evaluate whether or not such a turbine could fulfill the new requirements of the energy market, a study about the behavior of a prototype plant in low-load operation is presented. Therefore, prototype site measurements are performed to determine the most damaging operating point by means of acceleration sensors and pressure transducers. Moreover, unste

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18

Petrochenkov, Anton, Aleksandr Romodin, Vladimir Kazantsev, et al. "Principles of Imitation for the Loading of the Test Bench for Gas Turbines of Gas Pumping Units, Adequate to Real Conditions." Sustainability 13, no. 24 (2021): 13678. http://dx.doi.org/10.3390/su132413678.

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The purpose of the study is to analyze the prospects for the development of loading methods for gas turbines as well as to develop a mathematical model that adequately describes the real operating conditions of the loading system at various loads and rotation speeds. A comparative analysis of the most common methods and technical means of loading the shafts of a free turbine at gas turbine plants intended for operation as part of gas pumping units is presented. Based on the results of the analysis, the expediency of using the loading model “Free Power Turbine Rotor–Hydraulic Brake” as a load s

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19

Decaix, Jean, Vlad Hasmatuchi, Maximilian Titzschkau, and Cécile Münch-Alligné. "CFD Investigation of a High Head Francis Turbine at Speed No-Load Using Advanced URANS Models." Applied Sciences 8, no. 12 (2018): 2505. http://dx.doi.org/10.3390/app8122505.

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Анотація:

Due to the integration of new renewable energies, the electrical grid undergoes instabilities. Hydroelectric power plants are key players for grid control thanks to pumped storage power plants. However, this objective requires extending the operating range of the machines and increasing the number of start-up, stand-by, and shut-down procedures, which reduces the lifespan of the machines. CFD based on standard URANS turbulence modeling is currently able to predict accurately the performances of the hydraulic turbines for operating points close to the Best Efficiency Point (BEP). However, far f

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20

Sun, Shuaihui, Pei Ren, Pengcheng Guo, Longgang Sun, and Xiaobo Zheng. "Influence of the Gas Model on the Performance and Flow Field Prediction of a Gas–Liquid Two-Phase Hydraulic Turbine." Energies 15, no. 17 (2022): 6325. http://dx.doi.org/10.3390/en15176325.

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A two-phase hydraulic turbine’s performance and flow field were predicted under different Inlet Gas Volume Fractions (IGVF) with incompressible and compressible models, respectively. The calculation equation of equivalent head, hydraulic efficiency, and flow loss considering the expanding work of compressible gas were deduced based on the energy conservation equations. Then, the incompressible and compressible results, including the output power and flow fields, are compared and analyzed. The compressible gas model’s equivalent head, output power, and flow loss are higher than the incompressib

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21

Lopez Mejia, Omar D., Oscar E. Mejia, Karol M. Escorcia, Fabian Suarez, and Santiago Laín. "Comparison of Sliding and Overset Mesh Techniques in the Simulation of a Vertical Axis Turbine for Hydrokinetic Applications." Processes 9, no. 11 (2021): 1933. http://dx.doi.org/10.3390/pr9111933.

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The application of Computational Fluid Dynamics (CFD) to energy-related problems has increased in the last decades in both renewable and conventional energy conversion processes. In recent years, the application of CFD in the study of hydraulic, marine, tidal, and hydrokinetic turbines has focused on the understanding of the details of the complex turbulent flow and also in improving the prediction of the performance of these devices. There are several complexities involved in the simulation of Vertical Axis Turbine (VAT) for hydrokinetic applications. One of them is the necessity of a dynamic

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22

Astolfi, Davide, Ravi Pandit, Ludovica Celesti, Matteo Vedovelli, Andrea Lombardi, and Ludovico Terzi. "Data-Driven Assessment of Wind Turbine Performance Decline with Age and Interpretation Based on Comparative Test Case Analysis." Sensors 22, no. 9 (2022): 3180. http://dx.doi.org/10.3390/s22093180.

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An increasing amount of wind turbines, especially in Europe, are reaching the end of their expected lifetimes; therefore, long data sets describing their operation are available for scholars to analyze the performance trends. On these grounds, the present work is devoted to test case studies for the evaluation and the interpretation of wind turbine performance decline with age. Two wind farms were studied, featuring widely employed wind turbine models: the former is composed of 6 Senvion MM92 and the latter of 11 Vestas V52 wind turbines, owned by the ENGIE Italia company. SCADA data spanning,

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23

Sinagra, Marco, Tullio Tucciarelli, Calogero Picone, Costanza Aricò, and Marwa Hannachi. "Design of Reliable and Efficient Banki-Type Turbines." Environmental Sciences Proceedings 2, no. 1 (2020): 49. http://dx.doi.org/10.3390/environsciproc2020002049.

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A new shape for the external surface of the Crossflow turbine blades is proposed, which allows for the preservation of hydraulic efficiency in spite of a significant maximum blade thickness providing mechanic robustness and reliability. The final shape of the blades is assessed using an iterative solution for two uncoupled models: a 2D computational fluid dynamic (CFD) and a structural 3D finite element method (FEM) analysis of a single blade. Application of the proposed methodology to the design of a power recovery system (PRS) turbine, a new backpressure Crossflow-type inline turbine for pre

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24

Kocsis, Gergely, and George Xydis. "An Evaluation Framework on Additive Manufacturing for Hydraulic Systems in Wind Turbines Focused on System Simplification." Modelling 2, no. 2 (2021): 327–43. http://dx.doi.org/10.3390/modelling2020017.

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Анотація:

The wind energy industry showed rapid growth in the past decade, pushing designs to the physical limits. In the last few years, the exponential growth of the wind turbine sizes capped, and the performance upgrades are reached with optimization processes. The first wave was on major parts, but with time advancing the “cost out” strategies are pushed to minor components. A major problem is service costs and the continuous search for missing spare parts in the market. The main aim of this study is to identify when is the best entry point for the additive manufacturing (AM) technology by the hydra

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25

Chihaia, Rareş-Andrei, Lucia-Andreea El-Leathey, Gabriela Cîrciumaru, and Nicolae Tănase. "Increasing the energy conversion efficiency for shrouded hydrokinetic turbines using experimental analysis on a scale model." E3S Web of Conferences 85 (2019): 06004. http://dx.doi.org/10.1051/e3sconf/20198506004.

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The objective of the paper is to study the influence of certain shroud types suitable for horizontal axis hydrokinetic turbines using experimental testing in order to increase the energy conversion efficiency. The scale model of the shrouded hydrokinetic turbine is tested on a dedicated experimental bench for axial hydraulic turbine models. Two types of shrouds were tested in order to be compared: convergent shroud and divergent shroud. The rotor and shroud were made using 3D printer technology and were tested at a water velocity of 0.9 m/s on the closed-circuit testing bench. The testing faci

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26

Vodka, Oleksii, Yuliia Viazovychenko, Oleksiy Larin, and Kseniia Potopalska. "Computer modeling of the stress state and reliability assessment of bolted connections of the rotor and runner of Kaplan turbines." Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, no. 2 (December 31, 2022): 68–74. http://dx.doi.org/10.20998/2078-9130.2022.2.271065.

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Ensuring the trouble-free operation of hydroelectric power stations is an important element of the stability of the power grid. Hydraulic turbines are often used to regulate daily fluctuations in electricity consumption. It is the start/stop modes of the hydraulic unit that are the most dangerous and lead to the highest levels of mechanical stress. Therefore, the work is devoted to the development of detailed three-dimensional models for assessing the stress state of bolted connections of the impeller, and on their basis determining the stress state in different operating modes of the hydrauli

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27

Aryal, Shekhar, Sailesh Chitrakar, Rajendra Shrestha, and Ajay kumar Jha. "Credibility of Rotating Disc Apparatus for investigating sediment erosion in guide vanes of Francis turbines." IOP Conference Series: Earth and Environmental Science 1037, no. 1 (2022): 012034. http://dx.doi.org/10.1088/1755-1315/1037/1/012034.

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Abstract Estimation of sediment erosion in hydraulic turbines is limited by the broad range of dependent parameters, such as characteristics of sediment, base materials and flow conditions. Some mathematical models have been proposed in the past literatures and some of them has been incorporated in a CFD tool for predicting the erosion together with the flow conditions. Rotating Disc Apparatus is a simplified experimental setup that was initially developed targeting on erosion studies in Francis turbines. However, the closeness of the results obtained from this apparatus with the actual turbin

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28

Amelio, Mario, Silvio Barbarelli, and Domenico Schinello. "Review of Methods Used for Selecting Pumps as Turbines (PATs) and Predicting Their Characteristic Curves." Energies 13, no. 23 (2020): 6341. http://dx.doi.org/10.3390/en13236341.

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Анотація:

The use of Pumps As Turbines (PATs) can be the best solution for exploiting small hydraulic resources. Pump manufacturers do not provide the performances of their machines running in reverse mode, thus several authors developed appropriate prediction models. Some of them can only correlate the pump Best Efficiency Point (BEP) to the PAT corresponding one; other ones are able to obtain the characteristic curves. In this paper, a review of these methodologies is presented with the aim to find the best strategy that allows a designer of a small hydropower plant to select the PAT to be used and to

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29

Iovănel, Raluca Gabriela, Arash Soltani Dehkharqani, Diana Maria Bucur, and Michel Jose Cervantes. "Numerical Simulation and Experimental Validation of a Kaplan Prototype Turbine Operating on a Cam Curve." Energies 15, no. 11 (2022): 4121. http://dx.doi.org/10.3390/en15114121.

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Анотація:

The role of hydropower has become increasingly essential following the introduction of intermittent renewable energies. Quickly regulating power is needed, and the transient operations of hydropower plants have consequently become more frequent. Large pressure fluctuations occur during transient operations, leading to the premature fatigue and wear of hydraulic turbines. Investigations of the transient flow phenomena developed in small-scale turbine models are useful and accessible but limited. On the other hand, experimental and numerical studies of full-scale large turbines are challenging d

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30

Xu, Xinyong, Jinchang Liang, Wenjie Xu, Rui Liang, Jun Li, and Li Jiang. "Reinforced Concrete Wind Turbine Towers: Damage Mode and Model Testing." Sustainability 14, no. 8 (2022): 4410. http://dx.doi.org/10.3390/su14084410.

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This study investigates the complex load-bearing mechanism of the reinforced concrete tower of large wind turbines through a structural model test. MTS electro-hydraulic servo loading system was used to load two reinforced concrete tower models for the push-out test. The ultimate bearing capacity of the reinforced concrete tower was found to be 8.894 kN. The test findings revealed that the top of the tower is subjected to unilateral shear as the horizontal load increases. As a result, the concrete strain in the compression zone of the test piece increases to its highest level in the bottom pla

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31

Plua, Frank A., Francisco-Javier Sánchez-Romero, Victor Hidalgo, P. Amparo López-Jiménez, and Modesto Pérez-Sánchez. "New Expressions to Apply the Variation Operation Strategy in Engineering Tools Using Pumps Working as Turbines." Mathematics 9, no. 8 (2021): 860. http://dx.doi.org/10.3390/math9080860.

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The improvement in energy saving aspects in water systems is currently a topic of major interest. The utilization of pumps working as turbines is a relevant strategy in water distribution networks consisting of pressurized pipes, using these machines to recover energy, generate green energy and reduce leakages in water systems. The need to develop energy studies, prior to the installation of these facilities, requires the use of simulation tools. These tools should be able to define the operation curves of the machine as a function of the flow rate. This research proposes a new strategy to dev

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Galvis-Holguin, Steven, Jorge Sierra-Del Rio, and D. Hincapié-Zuluaga. "Enhancement efficiency of Michell-Banki turbine using NACA 6512 modified blade profile via CFD." EUREKA: Physics and Engineering, no. 2 (March 31, 2022): 55–67. http://dx.doi.org/10.21303/2461-4262.2022.002351.

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The small hydroelectric power plants (SHPP) are implemented in non-interconnected zones (NIZ) of developing countries. In which, the provision of electrical energy from the national interconnected system is not economically feasible. Therefore, in the literature, hydroelectric generation technologies have been implemented taking advantage of the energy available in the rivers. One of these technologies is the Michell-Banki type cross-flow turbines (MBT), which, despite having lower efficiencies than turbines such as Pelton and Francis, maintain their efficiency although fluctuations in site co

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Nag, Soumyadeep, Kwang Y. Lee, and D. Suchitra. "A Comparison of the Dynamic Performance of Conventional and Ternary Pumped Storage Hydro." Energies 12, no. 18 (2019): 3513. http://dx.doi.org/10.3390/en12183513.

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With decreasing costs of renewable energy harvesting devices, penetration of solar panels and wind turbines have increased manifold. Under such high levels of penetration, coping with increased intermittency and unpredictability and maintaining power system resiliency under reduced inertia conditions has become a critical issue. Pumped storage hydro (PSH) is the most matured and economic form of storage that can serve the purpose of capacity for over 4 to 8 h. However, to increase network inertia and add required flexibility to low inertia power systems, significant paradigm shifting modificat

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Magnoli, M. V., and J. Necker. "Simulation of pressure pulsations for pumped-storage units with wide operating range and comparison to experiments." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (2022): 012042. http://dx.doi.org/10.1088/1755-1315/1079/1/012042.

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Abstract The diversity of energy conversion sources in the current energy market increases the demand for stabilizing the electrical grid through ancillary services, frequency and power regulation from the facilities. Pumped-storage units with reversible pump-turbines or ternary sets constitute the currently most advanced solution for providing these services. This implies that pumped-storage units are required to operate in larger head and power ranges than before. In order to increase their flexibility in pump mode, variable speed units have been applied more frequently with additional chall

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Domfeh, Martin Kyereh, Samuel Gyamfi, Mark Amo-Boateng, Robert Andoh, Eric Antwi Ofosu, and Gavin Tabor. "Numerical Simulation of an Air-Core Vortex and Its Suppression at an Intake Using OpenFOAM." Fluids 5, no. 4 (2020): 221. http://dx.doi.org/10.3390/fluids5040221.

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A common challenge faced by engineers in the hydraulic industry is the formation of free surface vortices at pump and power intakes. This undesirable phenomenon which sometimes entrains air could result in several operational problems: noise, vibration, cavitation, surging, structural damage to turbines and pumps, energy losses, efficiency losses, etc. This paper investigates the numerical simulation of an experimentally observed air-core vortex at an intake using the LTSInterFoam solver in OpenFOAM. The solver uses local time-stepping integration. In simulating the air-core vortex, the standa

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Arunachaleswaran, A., Muralidhar Madhusudan, A. Ramya, S. Elangovan, and M. Sundararaj. "Comparative Study of Ram Air Turbines based on Wind Tunnel Study for Specific Air Borne Energy Extraction." Defence Science Journal 71, no. 5 (2021): 588–93. http://dx.doi.org/10.14429/dsj.71.16636.

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Ram Air Turbines (RAT) are used for emergency on-board power generation on aircraft and associated systems. Many studies on usage of RATs have shown promising results in terms of using RATs as a source of emergency on-board power generation. Many external podded systems on aircraft utilise RATs for self-sufficient adaptation. These pods generate their own power using RATs for their power requirements instead of depending on the mother aircraft power. Commercial cargo planes use RATs for generating emergency hydraulic power. A RAT was suggested to be used for emergency power, during failure of

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Amougou, Claude Boris, David Tsuanyo, Davide Fioriti, Joseph Kenfack, Abdoul Aziz, and Patrice Elé Abiama. "LCOE-Based Optimization for the Design of Small Run-of-River Hydropower Plants." Energies 15, no. 20 (2022): 7507. http://dx.doi.org/10.3390/en15207507.

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Run-of-river hydropower plants are a cost-efficient technology that produce a power output proportional to the instantaneous flow of water diverted from the exploited stream by exploiting several mechanical, hydraulic, and electric devices. However, as no storage is available, its design and operation is tailored according to the unpredictability of its power generation. Hence, the modelling of this type of power plants is a necessity for the promotion of its development. Accordingly, based on models from the literature, this study proposes a comprehensive methodology for optimally designed sm

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Bukhtoyarov, Vladimir Viktorovich, and Vadim Sergeevich Tynchenko. "Design of Computational Models for Hydroturbine Units Based on a Nonparametric Regression Approach with Adaptation by Evolutionary Algorithms." Computation 9, no. 8 (2021): 83. http://dx.doi.org/10.3390/computation9080083.

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This article deals with the problem of designing regression models for evaluating the parameters of the operation of complex technological equipment—hydroturbine units. A promising approach to the construction of regression models based on nonparametric Nadaraya–Watson kernel estimates is considered. A known problem in applying this approach is to determine the effective values of kernel-smoothing coefficients. Kernel-smoothing factors significantly impact the accuracy of the regression model, especially under conditions of variability of noise and parameters of samples in the input space of m

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Del Rio, A., E. Casartelli, L. Mangani, and D. Roos Launchbury. "Application of a Coupled Reynolds Stress Model to a Swirl-Driven Diffuser Flow." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (2022): 012068. http://dx.doi.org/10.1088/1755-1315/1079/1/012068.

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Abstract Swirling flow is a dominant feature in a significant number of technical applications. Hydraulic turbines at part-load are strongly affected by the related vortex rope phenomenon. Its dynamic behavior has a negative impact on the operating performance and durability of the machine. CFD can be used to get additional insight in this complex phenomenon but requires a valid simulation model able to capture the relevant flow physics, which is driven by highly anisotropic turbulent structures. The simulation results are therefore strongly affected by the turbulence modeling. A swirl apparat

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Granyak, Valeriy. "MATHEMATICAL MODEL OF OVERHEAD PARAMETRIC EDDY CURRENT PRIMARY MEASURING TRANSDUCER OF ABSOLUTE MOVEMENT." Vibrations in engineering and technology, no. 2(97) (August 27, 2020): 123–28. http://dx.doi.org/10.37128/2306-8744-2020-2-13.

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To date, even in the developed countries of Europe, more than 50% of the power generating equipment of hydropower plants have worked their design life. In the CIS countries, the percentage of such equipment is even higher. The complete replacement of such equipment requires a large amount of investment, while a significant part of the latter has a satisfactory technical condition for the further extension of the service life. However, with an increase in the operating time of every electrical equipments, the probability of its failure inevitably increases, which can lead to significant materia

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Ivarson, Mads Mehus, Chirag Trivedi, and Kaspar Vereide. "Investigations of Rake and Rib Structures in Sand Traps to Prevent Sediment Transport in Hydropower Plants." Energies 14, no. 13 (2021): 3882. http://dx.doi.org/10.3390/en14133882.

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In order to increase the lifespan of hydraulic turbines in hydropower plants, it is necessary to minimize damages caused by sediment erosion. One solution is to reduce the amount of sediments by improving the design of sand trap. In the present work, the effects on sand trap efficiency by installing v-shaped rake structures for flow distribution and rib structures for sediment trapping is investigated numerically using the SAS–SST turbulence model. The v-shaped rake structures are located in the diffuser near the inlet of the sand trap, while the ribs cover a section of the bed in the downstre

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Tkachuk, Mykola А., Andrey Grabovskiy, Mykola M. Tkachuk, et al. "THEORETICAL BASIS FOR ADVANCED SOLUTIONS OF HIGH RPM ELEMENTS OF CIVIL AND MILITARY MACHINES BASED ON STRENGTH AND DYNAMIC STABILITY CRITERIA." Bulletin of the National Technical University «KhPI» Series: Engineering and CAD, no. 1 (December 28, 2022): 79–84. http://dx.doi.org/10.20998/2079-0775.2022.1.08.

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In modern conditions, one of the significant obstacles to ensuring increased power, efficiency and resource of military and civilian vehicles is the exhausted possibilities of traditional technical solutions of basic elements and systems. This primarily applies to high-speed elements, in particular, turbines and rotary parts of air blowers of internal combustion engines, transmissions, drives, hydraulic machines and more. High speeds cause dynamic processes that can potentially lead to problems with strength, rigidity and stability. In order to substantiate the progressive technical solutions

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Zhang, Meng Sha, Zhong Ping Hua, Chen Shen, and Zhou Zhang. "The Parametric Modeling of Hydraulic Turbine Based on Pro/E Secondary Development." Applied Mechanics and Materials 577 (July 2014): 258–62. http://dx.doi.org/10.4028/www.scientific.net/amm.577.258.

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In this paper, combining with PRO/E4.0 software, getting the general design idea of the hydraulic turbine, and aiming at systematic analysis and research the key technologies of development design system process of hydraulic turbine. The key technologies include the pro/toolkit interface technology, menu design MFC dialog box as well as the establishment and access of database. Based on the two modes’ characteristics of PRO/TOOLKIT application, determining to use the DLL mode of the synchronous mode for the system design model's mode; Combining with the structure of the main parts of the hydra

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D. Obozov, Alaybek, Ruslan A. Akparaliyev, Taalaybek T. Mederov, and Victor G. Krasnov. "Bi-rotor micro hydro power plant for energy supply to isolated consumers." International Journal of Engineering & Technology 7, no. 2.13 (2018): 173. http://dx.doi.org/10.14419/ijet.v7i2.13.11682.

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This paper is dedicated to comparative analysis and description of a micro hydroelectric power plant with bi-rotor hydro generator. Based on the characteristics analysis, this paper describes a renewable energy source for a small watercourse; the feasibility of micro hydroelectric power plants with bi-rotor hydro generator is demonstrated. The features of their operation require in-depth research to substantiate parameters of such installations. This paper presents the analysis of the usage of micro hydroelectric solutions with bi-rotor hydro generator. The lattice theory problem was solved, w

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Simão, Mariana, Modesto Pérez-Sánchez, Armando Carravetta, and Helena Ramos. "Flow Conditions for PATs Operating in Parallel: Experimental and Numerical Analyses." Energies 12, no. 5 (2019): 901. http://dx.doi.org/10.3390/en12050901.

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Micro-hydro systems can be used as a promising new source of renewable energy generation, requiring a low investment cost of hydraulic, mechanical, and electrical equipment. The improvement of the water management associated with the use of pumps working as turbines (PATs) is a real advantage when the availability of these machines is considered for a wide range of flow rates and heads. Parallel turbomachines can be used to optimize the flow management of the system. In the present study, experimental tests were performed in two equal PATs working in parallel and in single mode. These results

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Skripkin, S. G., D. A. Suslov, I. V. Litvinov, E. U. Gorelikov, M. A. Tsoy, and S. I. Shtork. "Comparative analysis of air and water flows in simplified hydraulic turbine models." Journal of Physics: Conference Series 2150, no. 1 (2022): 012001. http://dx.doi.org/10.1088/1742-6596/2150/1/012001.

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Abstract This article presents a comparative analysis of flow characteristics behind a hydraulic turbine runner in air and water. Swirling flow with a precessing vortex core (PVC) was investigated using a laser Doppler anemometer and pressure pulsation sensors. The experiments were conducted on aerodynamic and hydrodynamic test rigs over a wide range of hydraulic turbine operating conditions. Part-load modes of hydraulic turbine operation were investigated using the Fourier transform of pressure pulsations obtained from acoustic sensors. The features of the swirling flow were shown for the ran

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Working Group Prime Mover and Energy Supply. "Hydraulic turbine and turbine control models for system dynamic studies." IEEE Transactions on Power Systems 7, no. 1 (1992): 167–79. http://dx.doi.org/10.1109/59.141700.

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Shi, Feng Xia, Jun Hu Yang, and Xiao Hui Wang. "Analysis of Off-Design Flow Field and Prediction of Performance in Hydraulic Turbine." Applied Mechanics and Materials 496-500 (January 2014): 877–80. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.877.

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Two models of hydraulic turbine based on pump in reversal were simulated. Pressure distribution of flow field in Variable conditions was analysed and external characteristic was forecasted for hydraulic turbine. It was shown: the head increased with flow increased, with increasing of flow rate, efficiency first increased and then decreased. Compared with the turbine with a guide vane, the head of two models was almost equal, but the disparity of efficiency was large, and the efficiency of hydraulic turbine with a guide vane above on the efficiency of hydraulic turbine without guide vane. Press

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Yurchenko, G. G. "Gas-turbine engine secondary air system analysis." Izvestiya MGTU MAMI 9, no. 3-4 (2015): 46–54. http://dx.doi.org/10.17816/2074-0530-67107.

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Secondary air system model based on graph theory and one dimentional hydraulic models is discussed. Channel inclination to major axis of integration is taking into account. New hydraulic channel model for smooth transition between “horizontal” and “vertical” flow passages is proposed. Commercial software for 2D and 3D flow modeling were used for one dimentional models verification.

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Vournas, C. D. "Second order hydraulic turbine models for multimachine stability studies." IEEE Transactions on Energy Conversion 5, no. 2 (1990): 239–44. http://dx.doi.org/10.1109/60.107216.

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