Results 101 to 110 of about 3,909,072 (255)
Numerical Study on Flow Characteristics in a Francis Turbine during Load Rejection
Energies, 2019 Labyrinth seals are not usually included in the numerical models of hydraulic machinery to simplify the geometric modeling, and thereby reduce the calculation burden.
Daqing Zhou +6 more
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Energies, 2019 With the improvement in energy structures, the safe and stable operation of hydropower units is becoming the most important issue for electric grids. To expand the stable operating range of a 200 m head Francis turbine, splitter blades were designed to ...
Yun Jia +4 more
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Optimization Of Gamm Francis Turbine Runner
, 2011 Nowadays, the challenge in hydraulic turbine design is the multi-objective design of turbine runner to reach higher efficiency. The hydraulic performance of a turbine is strictly depends on runner blades shape. The present paper focuses on the application of the multi-objective optimization algorithm to the design of a small Francis turbine runner. The
Sh. Derakhshan, A. Mostafavi
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E3S Web of Conferences, 2017 With an intention to reduce the consumption of energy from fossil fuels and the CO2 emission in relation with the climate change solution, Indonesian Government has targeted that the role of the New and Renewable Energy (NRE) resources reaches at least ...
Kamal Samsul, Prajitno, Pardadi Janu
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Investigation of Channel Vortices in Francis Turbines
IOP Conference Series: Earth and Environmental Science, 2016 In this paper the characteristics of one type of channel vortex and the effect of different parameters on this channel vortex have been investigated experimentally with the aid of high speed photography. The results show that locations of the channel vortices move from near the hub down to near the band with the increase n11 or the decrease Q11 ...
M LIU +4 more
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Comparison of 2nd generation LiDAR wind measurement technique with CFD numerical modelling [PDF]
, 2012 With the rapid increase in both on and offshore wind turbine deployment there is a requirement for a better understanding of the flow field in which such devices are deployed.
Butler, Jonathan, Quail, Francis
core
Analysis of Fatigue Failure of Francis Turbine Runner at Derbendikhan Hydropower Station
Sulaimani Journal for Engineering Sciences, 2017 Fatigue failures in Francis turbine runner are frequently occurred in hydropower plants, causing unexpected plant downtime and considerable financial loss. Decades of operational experience have shown that turbine runners develop fatigue cracks in areas,
Raza Abdulla Saeed
doaj
CAVITATION EROSION IN FRANCIS TURBINES
Municipal economy of citiesThe phenomenon of secondary flow is a global problem that causes cavitation erosion in hydraulic equipment. Cavitation is a phenomenon of localised corrosion of the metal surface leading to instability and highly uneven flow behaviour with a consequent excessive noise, vibration, and decreased efficiency in Francis, Kaplan, and other turbines.
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Sediment erosion in Francis turbines
, 2009 Sediment erosion is a major challenge for run-of-river power plants, especially during flood periods. Due to the high content of hard minerals such as quartz and feldspar carried in the river, substantial damage is observed on the turbine components. Material is gradually removed, thus the efficiency of the turbine decreases and the operating time of ...
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Steady Flow Analysis of Francis Turbine
Journal of Mechanical Engineering, 2009 The flow features are presented on different openings in Francis turbine by unsteady numerical simulation. The unsteady flow results are as follows:when the opening is 12 mm, pressure fluctuation at runner outlet near hub is not obvious and pressure fluctuation amplitudes near midstream and shroud are bigger.
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