Results 101 to 110 of about 3,909,072 (255)

Numerical Study on Flow Characteristics in a Francis Turbine during Load Rejection

open access: yesEnergies, 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
doaj   +1 more source

Experimental Study of the Effect of Splitter Blades on the Performance Characteristics of Francis Turbines

open access: yesEnergies, 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
doaj   +1 more source

Optimization Of Gamm Francis Turbine Runner

open access: yes, 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
openaire   +1 more source

Study of the use of a micro hydro in knockdown container completed with a cylindrical form housing of francis hydraulic turbine to support the development program of energy self-sustainability for remote and isolated areas in Indonesia

open access: yesE3S 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
doaj   +1 more source

Investigation of Channel Vortices in Francis Turbines

open access: yesIOP 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
openaire   +1 more source

Comparison of 2nd generation LiDAR wind measurement technique with CFD numerical modelling [PDF]

open access: yes, 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

open access: yesSulaimani 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

open access: yesMunicipal economy of cities
The 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.
openaire   +1 more source

Sediment erosion in Francis turbines

open access: yes, 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 ...
openaire   +2 more sources

Steady Flow Analysis of Francis Turbine

open access: yesJournal 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.
openaire   +1 more source

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