Numerical investigation of alleviation of undesirable effect of inter-blade vortex with air admission for a low-head Francis turbine

2020 ◽  
Vol 32 (6) ◽  
pp. 1151-1164
Author(s):  
Long-gang Sun ◽  
Peng-cheng Guo ◽  
Luo-chang Wu
Keyword(s):  
Numerical Investigation ◽  
Francis Turbine ◽  
Undesirable Effect ◽  
Low Head

Numerical investigation of hydrodynamics of the cavitating turbulent flow in a low head prototype francis turbine

2020 ◽  
Author(s):  
Gyanendra Tiwari ◽  
S. N. Shukla ◽  
Vishnu Prasad ◽  
Vivek Kr Patel
Keyword(s):  
Turbulent Flow ◽  
Numerical Investigation ◽  
Francis Turbine ◽  
Low Head

Influence of runner cone profile and axial water jet injection in a low head Francis turbine at part load

2022 ◽  
Vol 50 ◽  
pp. 101810
Author(s):  
Subodh Khullar ◽  
Krishna M. Singh ◽  
Michel J. Cervantes ◽  
Bhupendra K. Gandhi
Keyword(s):  
Water Jet ◽  
Francis Turbine ◽  
Jet Injection ◽  
Part Load ◽  
Low Head

scholarly journals Characteristic analysis of the efficiency hill chart of Francis turbine for different water heads

2017 ◽  
Vol 9 (2) ◽  
pp. 168781401769007 ◽  
Author(s):  
Pengcheng Guo ◽  
Zhaoning Wang ◽  
Longgang Sun ◽  
Xingqi Luo
Keyword(s):  
Incidence Angle ◽  
Suction Side ◽  
Francis Turbine ◽  
Small Range ◽  
Characteristic Analysis ◽  
Wide Range ◽  
Low Head ◽  
Model Efficiency ◽  
Hydraulic Turbines ◽  
High Head

According to several model test results of Francis turbines, complete model efficiency hill charts were constructed. The formation and inevitability of diversified hydraulic phenomena on model efficiency hill chart for typical head range were analyzed and the difference is compared, as well as characteristics and commonness toward the curves are discussed and summarized. Furthermore, hydraulic performance and geometric features are presented by particularly analyzing the efficiency hill charts. The inherent characteristics of Francis turbine is expressed by all kinds of curves on the model efficiency hill charts, and these curves can be adjusted and moved in a small range but cannot be removed out. Due to wide range of unit speed in terms of medium-low-head hydraulic turbines, incipient cavitation curve on suction side can be observed and it is positioned close to the operation zone; however, it fails to be visualized for the high-head turbine. The blade channel vortex curves are in the vicinity of optimum region for low-head hydraulic turbines, while high-head shows reverse trend. The interaction between zero incidence angle and zero circulation curve has a significant influence on isoefficiency circles. All comparisons and analyses could provide hydraulic design basis and retrofit references.

Numerical Simulation of Blade Channel Vortex in a Low Head Francis Turbine

2013 ◽  
Vol 291-294 ◽  
pp. 1958-1962 ◽  
Author(s):  
Hong Ming Zhang ◽  
Li Xiang Zhang
Keyword(s):  
Numerical Simulation ◽  
Francis Turbine ◽  
Transfer Model ◽  
Mass Transfer Model ◽  
Governing Equations ◽  
Cavitation Model ◽  
Finite Rate ◽  
Low Head ◽  
Simulation Results ◽  
Volume Method

The paper presents numerical simulation of blade channel vortex in a low head Francis turbine using OpenFoam code. A mixture assumption and a finite rate mass transfer model were introduced to analyze blade channel vortex. The finite volume method is used to solve the governing equations of the mixture model and the pressure-velocity coupling is handled via a Pressure Implicit with Splitting of Operators (PISO) procedure. Simulation results have shown that using cavitation model to analyze blade channel vortex is very effective.

scholarly journals Numerical investigation of inter‐blade cavitation vortex for a Francis turbine at part load conditions

2021 ◽  
Vol 15 (6) ◽  
pp. 1163-1177
Author(s):  
Longgang Sun ◽  
Pengcheng Guo ◽  
Xingqi Luo
Keyword(s):  
Numerical Investigation ◽  
Francis Turbine ◽  
Part Load ◽  
Load Conditions
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