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Добірка наукової літератури з теми "Hydraulic turbines Models"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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Статті в журналах з теми "Hydraulic turbines Models"

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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Анотація:

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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Анотація:

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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Анотація:

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.

Повний текст джерела

Анотація:

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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Анотація:

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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Анотація:

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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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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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.

Повний текст джерела

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.

Повний текст джерела

Анотація:

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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