Optimal selection of blade number of hydraulic turbine based on Computational Fluid Dynamics

2012 ◽  
Author(s):  
Yifan Wang ◽  
Shu Zhang ◽  
Guozhu Chen
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Hydraulic Turbine ◽  
Optimal Selection ◽  
Blade Number ◽  
Selection Of

scholarly journals Derivation of Global Parametric Performance of Mixed Flow Hydraulic Turbine Using CFD

1970 ◽  
Vol 7 ◽  
pp. 60-64 ◽  
Author(s):  
Ruchi Khare ◽  
Vishnu Prasad Prasad ◽  
Sushil Kumar
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Solutions ◽  
Guide Vane ◽  
Hydraulic Turbine ◽  
Francis Turbine ◽  
Mixed Flow ◽  
Flow Equations ◽  
Laboratory Setup ◽  
Wide Range

The testing of physical turbine models is costly, time consuming and subject to limitations of laboratory setup to meet International Electro technical Commission (IEC) standards. Computational fluid dynamics (CFD) has emerged as a powerful tool for funding numerical solutions of wide range of flow equations whose analytical solutions are not feasible. CFD also minimizes the requirement of model testing. The present work deals with simulation of 3D flow in mixed flow (Francis) turbine passage; i.e., stay vane, guide vane, runner and draft tube using ANSYS CFX 10 software for study of flow pattern within turbine space and computation of various losses and efficiency at different operating regimes. The computed values and variation of performance parameters are found to bear close comparison with experimental results.Key words: Hydraulic turbine; Performance; Computational fluid dynamics; Efficiency; LossesDOI: 10.3126/hn.v7i0.4239Hydro Nepal Journal of Water, Energy and EnvironmentVol. 7, July, 2010Page: 60-64Uploaded date: 31 January, 2011

scholarly journals Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

Fluids ◽  
2018 ◽  
Vol 3 (4) ◽  
pp. 73 ◽  
Author(s):  
Galih Bangga
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Separation ◽  
Spatial Interpolation ◽  
Flow Conditions ◽  
Cfd Simulations ◽  
Computational Fluid Dynamics Cfd ◽  
Correction Terms ◽  
Selection Of ◽  
Blade Element

The present studies deliver the computational investigations of a 10 MW turbine with a diameter of 205.8 m developed within the framework of the AVATAR (Advanced Aerodynamic Tools for Large Rotors) project. The simulations were carried out using two methods with different fidelity levels, namely the computational fluid dynamics (CFD) and blade element and momentum (BEM) approaches. For this purpose, a new BEM code namely B-GO was developed employing several correction terms and three different polar and spatial interpolation options. Several flow conditions were considered in the simulations, ranging from the design condition to the off-design condition where massive flow separation takes place, challenging the validity of the BEM approach. An excellent agreement is obtained between the BEM computations and the 3D CFD results for all blade regions, even when massive flow separation occurs on the blade inboard area. The results demonstrate that the selection of the polar data can influence the accuracy of the BEM results significantly, where the 3D polar datasets extracted from the CFD simulations are considered the best. The BEM prediction depends on the interpolation order and the blade segment discretization.

Selection of window sizes for optimizing occupational comfort and hygiene based on computational fluid dynamics and neural networks

2011 ◽  
Vol 46 (2) ◽  
pp. 298-314 ◽  
Author(s):  
G.M. Stavrakakis ◽  
D.P. Karadimou ◽  
P.L. Zervas ◽  
H. Sarimveis ◽  
N.C. Markatos
Keyword(s):  
Fluid Dynamics ◽  
Neural Networks ◽  
Computational Fluid Dynamics ◽  
Selection Of

Design and development of an eco-gate pump installation based on computational fluid dynamics

2016 ◽  
Vol 231 (14) ◽  
pp. 2636-2649 ◽  
Author(s):  
Huixiang Chen ◽  
Yuan Zheng ◽  
Daqing Zhou ◽  
Pingfei Shen ◽  
Huiwen Liu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Model Test ◽  
Energy Performance ◽  
Dynamics Simulation ◽  
Optimum Operating ◽  
Optimum Operating Condition ◽  
Blade Number ◽  
Profile Line ◽  
Lean Angle

To make water in urban rivers flowing and improve water quality, an eco-gate pump unit which uses plate gate as a carrier was designed and developed based on computational fluid dynamics method and the model test in this paper. Firstly, the bidirectional operation energy performance of eco-gate pump was verified by the model test. The results showed that the numerical simulation results were consistent with the model test results with an error of ±2% at the optimum operating condition both in the pumping mode and the powering mode, which verified the reliability and accuracy of numerical stimulation. The major sources of error associated with the power losses were due to the fact that the blade tip leakage and the blade deflection were not considered in computational fluid dynamics simulation. The thickened blade edges also contributed to the differences. On this basis, different schemes of runner blade’s setting angles, blade number, blade lean angle, bulb body’s length, and shoulder profile line were designed, and their influences on eco-gate pump’s performance were analyzed to choose the best runner type and bulb body’s profile line through the computational fluid dynamics numerical simulations. The numerical results showed that the eco-gate pump had the best hydraulic performance when the blade’s setting angle was ϕ = 23°, blade number z = 5, blade’s lean angle a = 0° and bulb body’s shoulder profile line was convex type with length L = 100 mm. The developed pump showed the highest efficiency of 70.95% under the condition of design discharge of 500 L/s and design lift of 1.0 m. Furthermore, the whole flow pattern of the optimized pump was analyzed. Overall, the eco-gate pump presented in this paper can make use of its low-lift pumping function to replenish the target water body more efficient than other similar products. At the same time, it also can utilize the micro-head water energy fully to generate power.

Fluid Dynamics Modeling of Particulate Deposition in the Lungs

2005 ◽  
Vol 28 (7) ◽  
pp. 667-677 ◽  
Author(s):  
D. Fontana ◽  
M. Vanni ◽  
G. Baldi
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Numerical Modeling ◽  
Particle Deposition ◽  
Detailed Knowledge ◽  
Dynamics Modeling ◽  
Human Lungs ◽  
Predictive Relationships ◽  
The Right ◽  
Selection Of

Detailed knowledge of the transport of air and particles in the human lungs is needed for two reasons: the selection of the right dosage of aerosol drugs used in respiratory therapy and the analysis of the maximum allowable concentration for particulate in air. This work is the first step of a more complex study, purpose of which is to provide some predictive relationships in order to evaluate the depth reached by the particles in the lungs as a function of their size using numerical modeling. In this phase we validated our numerical method, comparing the obtained results with those found in the literature. The Computational Fluid Dynamics code FLUENT 6 with the Eulerian-Lagrangian approach was used to simulate particle trajectories. A model of double bifurcation, based on the morphometric studies by Weibel and Hammersley and Olson, was adopted in order to represent the whole central part of the respiratory system with the same geometry, appropriately scaled down. A method to create a realistic velocity profile at the inlet of the domain was developed, in order to obtain data about particle deposition also reliable about the first bifurcation, unlike previous works.

scholarly journals Comparison of Blade Element Method and CFD Simulations of a 10 MW Wind Turbine

2018 ◽  
Author(s):  
Galih Bangga
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Separation ◽  
Spatial Interpolation ◽  
Flow Conditions ◽  
Cfd Simulations ◽  
Computational Fluid Dynamics Cfd ◽  
Correction Terms ◽  
Selection Of ◽  
Blade Element

The present studies deliver the computational investigations of a 10 MW turbine with a diameter of 205.8 m developed within the framework of the AVATAR (Advanced Aerodynamic Tools for Large Rotors) project. The simulations were carried out using two methods with different fidelity levels, namely the computational fluid dynamics (CFD) and blade element and momentum (BEM) approaches. For this purpose, a new BEM code namely B-GO was developed employing several correction terms and three different polar and spatial interpolation options. Several flow conditions were considered in the simulations, ranging from the design condition to the off-design condition where massive flow separation takes place, challenging the validity of the BEM approach. An excellent agreement is obtained between the BEM computations and the 3D CFD results for all blade regions, even when massive flow separation occurs on the blade inboard area. The results demonstrate that the selection of the polar data can influence the accuracy of the BEM results significantly, where the 3D polar datasets extracted from the CFD simulations are considered the best. The BEM prediction depends on the interpolation order and the blade segment discretization.

scholarly journals Simulation and selection of fin stabilizers for polar cruise ships based on Computational Fluid Dynamics

2021 ◽  
Vol 1986 (1) ◽  
pp. 012065
Author(s):  
Yunrui Zhao ◽  
Haibo Gao ◽  
Shaoshu Zhang ◽  
Zhiguo Lin ◽  
Yunhua Guo ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cruise Ships ◽  
Selection Of
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