scholarly journals Experimental Investigations and CFD Simulations of the Blade Section Pitch Angle Effect on the Performance of a Horizontal-Axis Hydrokinetic Turbine

2018 ◽  
Vol 22 (5) ◽  
pp. 141-154 ◽  
Author(s):  
Edwin Lenin Chica Arrieta ◽  
Cristian Cardona-Mancilla ◽  
J. Slayton ◽  
F. Romero ◽  
Edwar Torres ◽  
...  
Keyword(s):  
Pitch Angle ◽  
Horizontal Axis ◽  
Experimental Investigations ◽  
Cfd Simulations ◽  
Hydrokinetic Turbine ◽  
Blade Section ◽  
Angle Effect

scholarly journals Design and Pitch Angle Optimisation of Horizontal Axis Hydrokinetic Turbine with Constant Tip Speed Ratio

2017 ◽  
Vol 95 ◽  
pp. 06004 ◽  
Author(s):  
Suyash Nigam ◽  
Shubham Bansal ◽  
Tanmay Nema ◽  
Vansh Sharma ◽  
Raj Kumar Singh
Keyword(s):  
Pitch Angle ◽  
Horizontal Axis ◽  
Speed Ratio ◽  
Tip Speed Ratio ◽  
Hydrokinetic Turbine

Numerical analysis on the use of multi-element blades in a horizontal-axis hydrokinetic turbine

2020 ◽  
Vol 14 (4) ◽  
pp. 7328-7347
Author(s):  
Jonathan Aguilar ◽  
Laura Isabel Velásquez ◽  
Ainhoa Rubio Clemente ◽  
Edwin Chica
Keyword(s):  
High Efficiency ◽  
Numerical Models ◽  
Mechanical Energy ◽  
Horizontal Axis ◽  
Numerical Analyses ◽  
Operational Parameters ◽  
Ansys Fluent ◽  
Hydrokinetic Turbine ◽  
Blade Section ◽  
Lift And Drag

The blades of a hydrokinetic turbine have a great impact on its performance due to they are the elements responsible for capturing the kinetic energy from water and transform it into rotational mechanical energy. In this work, numerical analyses on the performance of a multi-element blade section were developed. The lift and drag coefficients (CL and CD, respectively) of the hydrofoils with traditional and multi-element configurations were studied. For this purpose, 2D numerical analyses were conducted by using JavaFoil code. S805, S822, Eppler 420, Eppler 421, Eppler 422, Eppler 423, Eppler 857, Wortmann FX 74-CL5-140, Wortmann FX 74-CL5-140 MOD, Douglas/Liebeck LA203A, Selig S1210, Selig S1223 and UI-1720 profiles were tested. The results indicated that the Eppler 420 multi-element hydrofoil provided high efficiency to the turbine. This was attributed to its higher relationship between the maximum CL and CD (CLmax /CD), which was equal to 47.77, compared to that of the Selig S1223 profile (39.59) and other hydrofoils studied. Therefore, the final optimized blade section selected was an Eppler 420 multi-element hydrofoil with a flap chord length of 70% of that of the main profile. The hydrodynamic and structural designs of the optimized blade section were validated with detailed 3D numerical models, through ANSYs Fluent software. The fluid and structural domains were connected using one-way coupling. The influence of the blade geometry and the operational parameters on the stresses supported by the blades were found by analyzing the fluid-structure interaction. From the numerical analyses conducted, it was observed that the blades did not exhibit structural fails. In this regard, the multi-element hydrofoil might be used for the design of a horizontal-axis hydrokinetic turbine with a high efficiency.

scholarly journals Probabilistic Performance Analysis of Eroded Compressor Blades

2005 ◽  
Author(s):  
A. Kumar ◽  
P. B. Nair ◽  
A. J. Keane ◽  
S. Shahpar
Keyword(s):  
Probabilistic Analysis ◽  
Surrogate Model ◽  
Uncertainty Propagation ◽  
Navier Stokes ◽  
Cfd Simulations ◽  
Compressor Blades ◽  
Geometry Modeling ◽  
Blade Section ◽  
Computational Fluid Dynamics Cfd ◽  
Fan Blade

This paper presents a probabilistic analysis of the effect of erosion on the performance of compressor fan blades. A realistic parametric CAD model is developed to represent eroded blades. Design of Experiments (DOE) techniques are employed to generate a set of candidate points, which are combined with a parametric geometry modeling and grid generation routine to produce a hybrid mesh. A multigrid Reynolds-Averaged Navier Stokes (RANS) solver HYDRA with Spalart Allmaras turbulence model is used for Computational Fluid Dynamics (CFD) simulations. The data generated is used to create a surrogate model for efficient uncertainty propagation. This method is applied to a typical Rolls Royce compressor fan blade section. Monte Carlo Simulation, using the surrogate model, is executed for the probabilistic analysis of the compressor fan blade. Results show upto 5% increase in pressure loss for the eroded compressor fan blades.

scholarly journals Numerical and Experimental Investigations on Reducing Particle Accumulation for SCR-deNOx Facilities

2019 ◽  
Vol 9 (19) ◽  
pp. 4158
Author(s):  
Zeng ◽  
Yuan ◽  
Wang
Keyword(s):  
High Speed ◽  
Power Plants ◽  
Catalyst Deactivation ◽  
Catalytic Reduction ◽  
Experimental Investigations ◽  
Duct Flow ◽  
Cfd Simulations ◽  
Particle Accumulation ◽  
Computational Fluid Dynamics Cfd ◽  
Vertical Duct

Selective catalytic reduction (SCR) is widely used to remove nitrogen oxides (NOx) in the flue gas of coal-fired power plants. The accumulation of ash particles inside the SCR-deNOx facility will increase the risk of catalyst deactivation or even damage. This paper presents the numerical and experimental investigations on the particle dispersal approach for the SCR-deNOx facility of a 1000 MW coal-fired power plant. The accumulation of different-sized particles is evaluated based on computational fluid dynamics (CFD) simulations. To prevent particles from accumulation, an optimized triangular deflector is proposed and attempts are made to find out the optimal installing position of the deflector. For the π-type SCR-deNOx facilities, the particle accumulation predominantly occurred on one side of the catalysts’ entrance, which corresponds to the inner side of the wedge-shaped turning. It is indicated that particles larger than 8.8 × 10−2 mm are responsible for the significant accumulation. The triangular deflector is proved to be an effective way to reduce particle accumulation and is found most efficient when it is installed at the high-speed area of the vertical duct. Flow model test (FMT) is carried out to validate the dispersal effect for the particle with relatively large sizes and the optimal installing position of the triangular deflector.

Measurement of Unsteady Aerodynamics Load on the Blade of Field Horizontal Axis Wind Turbine

2007 ◽  
Author(s):  
Takao Maeda ◽  
Yasunari Kamada ◽  
Keita Naito ◽  
Yuu Ouchi ◽  
Masayoshi Kozawa
Keyword(s):  
Wind Turbine ◽  
Pressure Distribution ◽  
Mode Frequency ◽  
Horizontal Axis ◽  
Strain Gauges ◽  
Aerodynamic Forces ◽  
Horizontal Axis Wind Turbine ◽  
Blade Root ◽  
Blade Section ◽  
Mechanical Moment

This paper describes an experimental field study of the rotor aerodynamics of wind turbines. The test wind turbine is a horizontal axis wind turbine, or: HAWT with a diameter of 10m. The pressure distributions on the rotating blade are measured with multi point pressure transducers. Sectional aerodynamic forces are analyzed from pressure distribution. Blade root moments are measured simultaneously by a pair of strain gauges. The inflow wind is measured by a three component sonic anemometer, the local inflow of the blade section are measured by a pair of 7 hole Pitot tubes. The relation between the aerodynamic moments on the blade root from pressure distribution and the mechanical moment from strain gauges is discussed. The aerodynamic moments are estimated from the sectional aerodynamic forces and show oscillation caused by local wind speed and direction change. The mechanical moment shows similar oscillation to the aerodynamic excepting the short period oscillation of the blade first mode frequency. The fluctuation of the sectional aerodynamic force triggers resonant blade oscillations. Where stall is present along the blade section, the blade’s first mode frequency is dominant. Without stall, the rotating frequency is dominant in the blade root moment.

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