scholarly journals High Humidity Aerodynamic Effects Study on Offshore Wind Turbine Airfoil/Blade Performance through CFD Analysis

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Weipeng Yue ◽  
Yu Xue ◽  
Yan Liu
Keyword(s):  
Water Vapor ◽  
Wind Turbine ◽  
Performance Degradation ◽  
Offshore Wind ◽  
High Humidity ◽  
Humidity Effects ◽  
Water Condensation ◽  
Turbine Performance ◽  
Air Density ◽  
Rainy Weather

Damp air with high humidity combined with foggy, rainy weather, and icing in winter weather often is found to cause turbine performance degradation, and it is more concerned with offshore wind farm development. To address and understand the high humidity effects on wind turbine performance, our study has been conducted with spread sheet analysis on damp air properties investigation for air density and viscosity; then CFD modeling study using Fluent was carried out on airfoil and blade aerodynamic performance effects due to water vapor partial pressure of mixing flow and water condensation around leading edge and trailing edge of airfoil. It is found that the high humidity effects with water vapor mixing flow and water condensation thin film around airfoil may have insignificant effect directly on airfoil/blade performance; however, the indirect effects such as blade contamination and icing due to the water condensation may have significant effects on turbine performance degradation. Also it is that found the foggy weather with microwater droplet (including rainy weather) may cause higher drag that lead to turbine performance degradation. It is found that, at high temperature, the high humidity effect on air density cannot be ignored for annual energy production calculation. The blade contamination and icing phenomenon need to be further investigated in the next study.

High Humidity Aerodynamic Effects Study on Offshore Wind Turbine Airfoil/Blade Performance Through CFD Analysis

2017 ◽  
Author(s):  
Xue Yu ◽  
Liu Yan
Keyword(s):  
Water Vapor ◽  
Wind Turbine ◽  
Performance Degradation ◽  
Offshore Wind Turbine ◽  
High Humidity ◽  
Humidity Effects ◽  
Water Condensation ◽  
Turbine Performance ◽  
Air Density ◽  
Rainy Weather

Damp air with high humidity combined with foggy, rainy weather as well as icing in winter weather often found to cause turbine performance degradation, and it is more concerned with off-shore wind farm development. To address and understand the high humidity effects on wind turbine performance, our study has been conducted with spread sheet analysis on damp air properties investigation for air density and viscosity, then CFD modeling study using Fluent were carried out on Airfoil and Blade aerodynamic performance effects investigation due to water vapor partial pressure of mixing flow and water condensation around leading edge and trailing edge of airfoil. It is found that the high humidity effects with water vapor mixing flow and water condensation thin film around airfoil may have insignificant effect directly on airfoil/blade performance; however the indirect effects such as blade contamination and icing due to the water condensation may have significant effects on turbine performance degradation. Also found the foggy weather with micro water droplet (including rainy weather) may cause higher drag that lead to turbine performance degradation. It is found that at high temperature, the high humidity effect on air density cannot be ignored for annual energy production calculation. As qualitative validation, the CFD result was compared and correlated with field observation in foggy day of cold weather. The blade contamination and icing phenomenon need to be further investigated in the future study, and blade surface properties such as high surface energy coating effects on water condensation and icing will be investigated for anti-icing coating agent development.

scholarly journals Wave Influenced Wind and the Effect on Offshore Wind Turbine Performance

2014 ◽  
Vol 53 ◽  
pp. 202-213 ◽  
Author(s):  
Siri Kalvig ◽  
Eirik Manger ◽  
Bjørn H. Hjertager ◽  
Jasna B. Jakobsen
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Turbine Performance

scholarly journals Humidity Effects on Gas Turbine Performance

1991 ◽  
Author(s):  
J. Bird ◽  
W. Grabe
Keyword(s):  
Gas Turbine ◽  
Absolute Humidity ◽  
Performance Data ◽  
Specific Humidity ◽  
High Humidity ◽  
Engine Operation ◽  
Humidity Effects ◽  
Turbine Performance ◽  
Test Conditions ◽  
And Performance

Moisture in the intake air of a gas turbine can affect its operation and performance in two different ways: by possible condensation in the inlet and by changing the gas properties throughout the cycle. Condensation can be controlled by restricting engine operation with limits on relative and absolute humidities. Two fundamental correction approaches for the effects of humidity on major engine parameters were investigated; they were found to compare very well. Both methods correct parameters as a function of absolute humidity, yielding corrections of between 0.1 and 0.8%, for high humidity test conditions. Additional operational, engine-specific humidity corrections were examined: some notable differences were observed. Recommendations are made for the correction of major performance data for absolute humidity.

scholarly journals Wind Turbine Power Calculations Using MATLAB-SIMULINK

2021 ◽  
pp. 54-61
Author(s):  
H. L. Suresh ◽  
C. V. Mohan ◽  
Nitin Kumar Reddy K N
Keyword(s):  
Wind Speed ◽  
Modeling And Simulation ◽  
Wind Turbine ◽  
Wind Velocity ◽  
Simulation Method ◽  
Financial Viability ◽  
Turbine Performance ◽  
Air Density ◽  
Overall Performance ◽  
Swept Area

In this paper modeling and simulation has been studied by means of impact of energy generated by using wind turbine. The strength conversion primarily depends on the wind velocity and swept area. When design wind structures it’s very important to recognize predicted electricity and electricity output for calculating financial viability. Wind turbine performance depends on wind speed, air density, air pressure, temperature and length of blade. The modeling and simulation method is used to analyze the overall performance of wind turbine.

Wind Turbine Performance Analysis of An Offshore Wind Farm in China

2021 ◽  
Author(s):  
Xinming Chen ◽  
Lailong Li ◽  
Xin Liu ◽  
Yutong Guo ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Wind Turbine ◽  
Wind Farm ◽  
Offshore Wind ◽  
Offshore Wind Farm ◽  
Turbine Performance

On the Extreme Rotor and Support Structure Response of an Offshore Wind Turbine in an Evolving Hurricane

2013 ◽  
Author(s):  
E. Kim ◽  
L. Manuel
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Support Structure ◽  
Yaw Control ◽  
Structure Response ◽  
Turbine Performance ◽  
Extreme Response ◽  
Response Measures

This study examines extreme response statistics for a monopile-supported 5-MW offshore wind turbine in 20 meters of water that is subjected to coupled wind and wave input fields during a hurricane. Over approximately 120 hours, these hurricane-induced input fields yield changing characteristics of the excitation and the response of a parked turbine. As the storm evolves, the directionality of the wind and waves changes; short-crested waves are simulated and associated wind velocity fields are generated. Aerodynamic loads on the rotor and hydrodynamic loads on the support structure are simulated in coupled response analyses. Because yaw control backup power is not assured during the hurricane, different assumptions on yaw misalignment are assumed in the turbine response simulations. Time series of various turbine response measures are evaluated. Response extremes are of particular interest; we discuss the relative importance of wind and waves on the overall turbine performance during the storm. We also assess the role of yaw control systems and the effect of loss of power to such systems during tropical storms by examining the turbine response for alternative situations of turbine misalignment. Ultimately, this study seeks to provide the framework for assessing turbine designs for tropical cyclone conditions.

Wind/Wave Basin Verification of a Performance-Matched Scale-Model Wind Turbine on a Floating Offshore Wind Turbine Platform

2014 ◽  
Author(s):  
Richard Kimball ◽  
Andrew J. Goupee ◽  
Matthew J. Fowler ◽  
Erik-Jan de Ridder ◽  
Joop Helder
Keyword(s):  
Wind Turbine ◽  
Model Test ◽  
Reynolds Numbers ◽  
Full Scale ◽  
Offshore Wind ◽  
Scale Model ◽  
Scaled Model ◽  
Turbine Performance ◽  
Wave Basin ◽  
The University

In 2011, the DeepCwind Consortium performed 1/50th-scale model tests on three offshore floating wind platforms at the Maritime Research Institute Netherlands (MARIN) using a geometrically scaled model of the National Renewable Energy Laboratory (NREL) 5 MW reference turbine. However, due to the severe mismatch in Reynolds number between full scale and model scale, the strictly Froude-scaled, geometrically-similar (geo-sim) wind turbine underperformed greatly, which required significant modification of test wind speeds to match key wind turbine aerodynamic loads, such as thrust. The conclusion from these prior efforts was to abandon a geometrically similar model turbine and use a performance-matched turbine model in its place, keeping mass and inertia properties properly scaled, but utilizing modified blade geometries to achieve required performance at the lower Reynolds numbers of the Froude scaled model. To this end, the University of Maine and MARIN worked in parallel to develop performance-matched turbines designed to emulate the full scale performance of the NREL 5 MW reference turbine at model scale conditions. An overview of this performance-matched wind turbine design methodology is presented and examples of performance-matched turbines are provided. The DeepCwind semi-submersible platform was retested at MARIN in 2013 using the MARIN Stock Wind Turbine (MSWT), which was designed to closely emulate the performance of the original NREL 5 MW turbine. This work compares the wind turbine performance of the MSWT to the previously used geometrically scaled NREL 5 MW turbine. Additionally, turbine performance testing of the 1/50th-scale MSWT was completed at MARIN and a 1/130th-scale model was tested at the University of Maine under Reynolds numbers corresponding to the Froude-scaled model test conditions. Results from these tests are provided to demonstrate effects on model test fidelity. Comparisons of the performance response of the geometrically matched turbine to the performance-matched turbines are also presented to illustrate the performance-matched turbine methodology. Lastly, examples of the fully dynamic floating system performance using the original geometrically scaled NREL 5 MW turbine and the MSWT are investigated to illustrate the implementation of the model test procedure as well as the effects of turbine performance on floater response. Using the procedures employed for the MARIN tests as a guide, the results of this work support the development of protocols for properly designing scale model wind turbines that emulate the full scale design for Froude-scale wind/wave basin tests of floating offshore wind turbines.

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