The Strength Analysis of Francis Turbine Runner Based on the Fluid-Solid Coupling

2014 ◽  
Vol 709 ◽  
pp. 41-45
Author(s):  
Kan Kan ◽  
Yuan Zheng ◽  
Xin Zhang ◽  
Bin Sun ◽  
Hui Wen Liu
Keyword(s):  
Water Pressure ◽  
Eastern China ◽  
Static Stress ◽  
Operating Conditions ◽  
Francis Turbine ◽  
Strength Analysis ◽  
Maximum Deformation ◽  
The North ◽  
North Eastern ◽  
Turbine Runner

This paper does unidirectional fluid-solid coupling calculation on the runner strength under three designed head loading conditions of a certain Francis turbine in the north-eastern China. The water pressure on the blade in the flow fields of different operating conditions is calculated by means of CFD software CFX. With the help of ansys workbench, the water pressure is loaded to the blade as structural load to conclude the static stress distribution and deformation of the runner under different operating conditions. The results show that the maximum static stress increases with the rise of the flow and appears near the influent side of the blade connected to the runner crown; the maximum deformation increases with the rise of the flow and appears on the band. The results provides effective basis for the structural design and safe operation of the Francis turbine.

Coastline Change and Erosion-Accretion Evolution of the Sandwip Island, Bangladesh

2019 ◽  
pp. 434-447
Author(s):  
Al Emran ◽  
Md. Abdur Rob ◽  
Md. Humayun Kabir
Keyword(s):  
Water Depth ◽  
Water Pressure ◽  
Steep Slope ◽  
Erosion Processes ◽  
Coastline Change ◽  
The North ◽  
Topographic Slope ◽  
North Eastern ◽  
Near Shore ◽  
Different Parts

The study tries to analyze the morphological and hydrological changes and to establish their relationship in the Sandwip Island through the integration of Remote Sensing (RS) and Geographic Information Systems (GIS). The study concludes from the recent 30 years' data that the different parts of the island response different cycle of coastline change associated with hydrological dynamics. The resulted net loss of the coastline is about 6.98 km (0.23 km/y) and the net loss of the coastal area is about 23.99 km2 (0.8 km2/y). The erosion processes (increase in the water depth near shore) were active along the western and the south-western shores. This erosion of the island is facilitated by the steep slope of the bank, high tidal water pressure and loose bank materials. In contrast, the accretions (decrease in the water depth near shore) were taken place in the larger parts of the northern and the north-eastern shores of the island. This is due to the backwash sediment deposition with the favor of gentle topographic slope along shores.

scholarly journals 3D unsteady turbulent flow analysis in a Francis turbine runner at nominal and off-design operating conditions

2004 ◽  
Vol 26 (3) ◽  
pp. 148-156
Author(s):  
Pham Thi Kim Loan ◽  
Bui Van Ga
Keyword(s):  
Turbulent Flow ◽  
Flow Analysis ◽  
Operating Conditions ◽  
Design Flow ◽  
Francis Turbine ◽  
Navier Stokes ◽  
Medium Size ◽  
Turbine Runner ◽  
Design Values ◽  
Physical Phenomena

This paper presents the use of a commercial Navier-Stokes turbulent flow code (FLUENT) as a mean to evaluate the behavior of a Francis turbine runner for the design and off-design conditions. The flow in the runner is analyzed numerically at different operating points. The numerical results permit to observe physical phenomena in the runner that are important in the process of hydraulic turbo machinery design. Values of different velocity components in the flow, blade pressure distribution ... given by the model are compared with experimental data at nominal and off-design flow conditions. Computer resource involves in the flow analysis should be compatible with the need of design process of a runner. Therefore 12 hours of CPU time can be considered as acceptable for calculating at each operating point on a computer workstation of medium size power.

scholarly journals A Late Permian flora of Pechora affinity in North Greenland

1982 ◽  
Vol 108 ◽  
pp. 5-13
Author(s):  
R.H Wagner ◽  
N.J Soper ◽  
A.K Higgins
Keyword(s):  
Eastern China ◽  
Late Permian ◽  
Fold Belt ◽  
The North ◽  
North Eastern ◽  
Warm Temperate ◽  
North Greenland

Late Permian plant impressions comprising six taxa have been obtained from the North Greenland fold belt. Rhipidopsis, a probable ginkgophyte, occurs together with the fems Prynadaeopteris venusta Radczenko and Pecopteris (Asterotheca?) cf. P. (A?) helenaeana Zalessky, the sphenophyte Sphenophyllum cf. S. biarnicum Zalessky the cordaitean Cordaites cf. C. sylovaensis (Neuburg) Meyen and a possibie conifer branch fragment. The assemblage invites comparison with the Pechora flora of the northem Pre-Urals, and also with that of Mongolia and north-eastern China. These may be warm temperate floras on approximately the same palaeolatitude.

Analysis of Inner Flow Inside Francis Turbine Runner Based on Dissipation Function

2008 ◽  
Author(s):  
Xiaojing Wu ◽  
Yulin Wu ◽  
Shuhong Liu
Keyword(s):  
Energy Loss ◽  
Flow Simulation ◽  
Dissipation Function ◽  
Operating Conditions ◽  
Surface Strain ◽  
Francis Turbine ◽  
Dominant Factor ◽  
Flow Energy ◽  
Runner Blade ◽  
Turbine Runner

Energy loss inside a Francis turbine runner is analyzed with dissipation function in this paper. The dissipation rate of a Newtonian flow with constant shear viscous has three constituents from dilation, vorticity, and surface strain, which is derived from kinetic energy equation presented in this paper. A commercial N-S equation solver has been employed for 3D turbulent flow simulation with a model Francis turbine, and three different operating conditions are chosen for comparison, which are part load, rated load, and excessive load. The results from simulation have been compared with model experiments to validate their preciseness and reliability. The distribution of dissipation constituents on runner blade surface have been extracted from the above simulation results. The distinction of these constituents can be used to identify flow structures inside runner. The flow energy loss is determined by dissipation function, thus it can affect the hydraulic efficiency of turbine runner. From the above results, it can be seen that what causes the energy loss, which is the dominant factor, and where it has the highest value. Thus this analysis based on dissipation function can be used for flow diagnosis inside the blade channel, and tell us which part of the blade should be improved to reduce the energy loss.

CFD-Based Energy Improvement of a Parametric Blade Model for a Francis Turbine Runner

2008 ◽  
Author(s):  
Jose´ Manuel Franco-Nava ◽  
Erik Rosado-Tamariz ◽  
Jose´ Manuel Ferna´ndez-Da´vila ◽  
Reynaldo Rangel-Espinosa
Keyword(s):  
Reference Model ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Optimization Process ◽  
Francis Turbine ◽  
Power Stations ◽  
Runner Blade ◽  
Turbine Runner ◽  
Blade Model

The computational fluid dynamic (CFD) based energy improvement of the parametric blade model for a Francis turbine runner is presented. The evaluation of the energy improved uses the results of CFD based optimization of a hydraulic Francis turbine runner. The parametric runner model used by the CFD based optimization process was obtained by applying a parametric blade modeller for turbomachinery based on a geometric reference model. This parametric runner model and the optimization process were computed by using a three dimensional Navier-Stoke commercial turbomachinery oriented CFD code. The flow within hydraulic turbines has a thin boundary layer and noticeable pressure gradients. Hence, the CFD computations were carried out using the Sparlat-Allmaras turbulence model. The aim of the optimization process was improve the performance of the machine. This process was computed by a CFD code integrated environment which combines genetic algorithms and a trained artificial neural network. After optimization cycle convergence, an increment not only in efficiency but also in power was obtained. The energy that is transferred to the runner blade and transformed in torque and power was obtained by using CFD results. From pressure distribution along the normalized arc length of the runner blade for three operating conditions (100%, 85% and, 75% of load) the energy distribution was computed not only for the reference runner but also for the optimized parametric model of the turbine runner. Finally, the averaged energy saved for the same operating conditions was evaluated. Results have shown that application of CFD based optimization can modify and improve runners design so as to increase the efficiency and power of installed hydraulic power stations.

scholarly journals The South of the Russian Far East as a Unique Ethnic Region: Concerning the Issue of Interaction of Musical Cultures

ICONI ◽  
2021 ◽  
pp. 94-101
Author(s):  
Svetlana V. Mezentseva ◽  
Keyword(s):  
Computer Music ◽  
Foreign Students ◽  
Eastern China ◽  
Russian Far East ◽  
Far East ◽  
Mutual Cooperation ◽  
The North ◽  
Musical Cultures ◽  
North Eastern ◽  
The Russian Far East

The article examines the southern part of the Russian Far East, which has a great potential from the perspective of the interaction of musical cultures and the formation of a unique ethno-cultural zone. On the basis of contemporary research works the circle of possible ethnic contacts in the region on the contemporary stage is delineated. In the ethnic characterization of the Russian Far East certain modifi cations towards the direction of expansion of the ethnic makeup and change of the region’s social characterization. The adjacency with the two provinces of North-Eastern China — Heilongjiang and Jilin bordering Russia on the north and east — are noted as a territorial premise for close mutual cooperation. The persistent interest in having foreign students receive an academic musical education of a Western European type in the region’s artistic educational institutions. Accentuation is made of the great potential for the interaction between musical cultures connected with the use of contemporary computer music technologies. The author of the article highlights the fastest developing trends in the interaction between the musical cultures of the peoples of the Far East of Russia and China on the basis of the use of computer music technologies: compositional activities, performance and education. Observation is made of the decline of the population of the indigenous peoples of the Russian Far East and the change of the region’s ethnic make-up as the result of the processes of migration, as well as the increase in the number of foreign students from China in the educational space and the concert and competition venues of the region.

Coastline Change and Erosion-Accretion Evolution of the Sandwip Island, Bangladesh

2017 ◽  
Vol 8 (2) ◽  
pp. 33-44 ◽  
Author(s):  
Al Emran ◽  
Md. Abdur Rob ◽  
Md. Humayun Kabir
Keyword(s):  
Water Depth ◽  
Water Pressure ◽  
Erosion Processes ◽  
Coastline Change ◽  
The North ◽  
Topographic Slope ◽  
Tidal Water ◽  
North Eastern ◽  
Near Shore ◽  
Different Parts

The study tries to analyze the morphological and hydrological changes and to establish their relationship in the Sandwip Island through the integration of Remote Sensing (RS) and Geographic Information Systems (GIS). The study concludes from the recent 30 years' data that the different parts of the island response different cycle of coastline change associated with hydrological dynamics. The resulted net loss of the coastline is about 6.98 km (0.23 km/y) and the net loss of the coastal area is about 23.99 km2 (0.8 km2/y). The erosion processes (increase in the water depth near shore) were active along the western and the south-western shores. This erosion of the island is facilitated by the steep slope of the bank, high tidal water pressure and loose bank materials. In contrast, the accretions (decrease in the water depth near shore) were taken place in the larger parts of the northern and the north-eastern shores of the island. This is due to the backwash sediment deposition with the favor of gentle topographic slope along shores.

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