Two different blade profiles were investigated for the performance of VAWT rotor. One is two scopped with different overlap ratios and the aspect ratios test under three different sir velocities and the other is the forward curved profiled blades with different inclinations with respect to shaft normal at the aspect ratios of 1 and 2. The present investigation helps in concluding that a two-scoop blades arrangement with H/D = 0,775 and e/d = 0,24 contributes the most favorable value of rotational speed of the rotor at which power coefficient and the torque coefficient can be maximized. While for the forward curved profiled blades the investigation realizes that higher power out of three blade system with curtaining from the combined effect of all the parameter i.e. N, Ω, ξP and ξT provides the higher strength of the power output. Hence, the three-blade system with curtaining is considered as the best out of all the blades tested.
Table of Contents
Chapter 1 INTRODUCTION
1.1 Wind in world around us
1.2 Growth of wind power in India
1.3 Wind Turbines
1.3.1 Types of Wind Turbine
1.3.2 Early start of VAWT and HAWT
1.4 Performance map of Various Windmill Rotors:
1.5 Advantages of VAWT and HAWT
1.5.1 VAWT advantages
1.5.2 VAWT disadvantages
1.5.3 HAWT advantages
1.5.4 HAWT disadvantages
1.6 Applications of VAWT
Chapter 2 Literature Review
2.1 Preceding Researches
2.2 Outcome from the literature review:
Chapter 3 Experimental set-up and procedure
3.1 The subsonic wind tunnel and its calibration
3.2 Two-scoop rotor
3.3 Profiled blades
3.4 Blow down of wind tunnel
3.5 Performance parameters of Wind Turbine
Chapter 4 Results and Discussion
4.1 Forward Curved Blade (3 Full Blades System)
4.2 Forward Curved Blade (6 Full Blades System)
4.3 Forward Curved Blade (6 Half Blades Blades)
4.4 Comparison between 3-full Blades and 6-half Blades Forward Curved Profiles
4.5 Mixed Full and Half Blade System
4.6 Two Scoop Blades (Savonius Type)
Chapter 5 Conclusions and future scope
5.1 Two scoop blades
5.2 Forward curved blade
5.3 Future scope of work
Research Objectives and Key Topics
The primary objective of this work is to investigate and optimize the performance parameters of Vertical Axis Wind Turbines (VAWT), specifically focusing on different blade configurations such as Savonius-type and forward-curved blades. The research aims to evaluate how design variations influence power generation, torque coefficients, and rotational speeds under controlled wind tunnel conditions.
- Analysis of different blade geometries and their impact on turbine performance.
- Experimental evaluation of curtaining effects on various blade arrangements.
- Optimization of design parameters including overlap ratios and aspect ratios.
- Comparative study between 3-full, 6-full, and mixed blade systems.
- Examination of torque variation and dynamic performance characteristics.
Extract from the Book
1.3.2 Early start of VAWT and HAWT
Vertical Axis Wind Turbine (VAWT) has come into existence from the work of Savonius who was from Finland. Its rotor was S-shaped and had the principle rotor shaft organized vertically. Since then, VAWT has been under investigation for the improvement of its performance parameters. In these turbines, the generator and the gearbox are placed near the ground. The main advantage of Vertical Axis Wind Turbines is that it eats the air from all the directions. Thus, it does not require any yaw mechanism.
Horizontal Axis Wind Turbine (HAWT)
When the concept of wind turbine has reach Europe, there the idea had changes in the form of horizontal shaft and vertically spinning wheel in late twelfth century. Such machines were initially appeared in France and the in England. There the provision were developed to mount the gearbox and the generator to the wind turbine height, however a yawing mechanism was need to direct the spinning to face the prevailing wind in a cross-flow manner. Then after, the development of Horizontal Axis Wind Turbine (HAWT) started.
Summary of Chapters
Chapter 1 INTRODUCTION: This chapter provides an overview of the global and Indian wind energy landscape, classifying wind turbine types and introducing the historical development and basic characteristics of VAWT and HAWT systems.
Chapter 2 Literature Review: This section summarizes prior experimental and computational research efforts aimed at maximizing the power and torque coefficients of Savonius-type wind rotors.
Chapter 3 Experimental set-up and procedure: This chapter details the subsonic wind tunnel setup, calibration processes, and the specific fabrication of various blade configurations tested during the study.
Chapter 4 Results and Discussion: This chapter presents the experimental data and performance analyses for different blade systems, including forward-curved blades and Savonius-type two-scoop rotors, assessing parameters like power coefficient and torque under varying conditions.
Chapter 5 Conclusions and future scope: The final chapter provides a summary of findings regarding the optimal configurations for the tested blade systems and suggests potential directions for future research in VAWT performance optimization.
Key Words
Wind Turbine, VAWT, HAWT, Savonius Rotor, Power Coefficient, Torque Coefficient, Aspect Ratio, Overlap Ratio, Blade Inclination, Wind Tunnel, Aerodynamics, Blade Configuration, Dynamic Power, Rotational Speed, Renewable Energy
Frequently Asked Questions
What is the core focus of this research?
The research focuses on the performance testing of Vertical Axis Wind Turbines (VAWT), examining how specific design parameters affect the aerodynamic efficiency of different blade configurations.
What are the primary themes addressed in the text?
The text addresses wind energy development, the aerodynamic characteristics of various rotor types, experimental methods for measuring turbine performance, and the optimization of turbine design through controlled laboratory testing.
What is the primary objective of this experimental study?
The primary objective is to optimize the design of VAWTs—specifically through varying blade inclination, aspect ratio, and overlap ratio—to maximize power extraction and torque production.
Which scientific methodology is employed?
The study employs an experimental approach using a subsonic wind tunnel to test prototype rotors, measuring variables like RPM, wind velocity, and dynamic torque to calculate performance coefficients.
What topics are covered in the main body of the work?
The main body covers the literature review of existing research, the technical description of the experimental setup, and a detailed discussion of the results obtained from testing different rotor designs, such as forward-curved and two-scoop blades.
Which keywords best characterize this work?
Key terms include Vertical Axis Wind Turbine (VAWT), Savonius rotor, power coefficient, torque coefficient, wind tunnel testing, and blade configuration optimization.
How does the performance of a 3-full blade system compare to a 6-full blade system?
The study found that the 3-full blade system generally outperformed the 6-full blade system, providing higher power output and better performance consistency across various inclination settings.
What role does the "curtaining" arrangement play in the rotor's performance?
Curtaining is used to prevent negative torque and increase the aerodynamic performance of the rotor, and the study indicates that it generally increases the power coefficient for the tested blade configurations.
What is the optimal combination identified for the two-scoop Savonius blades?
The investigation concluded that an aspect ratio (H/D) of 0.775 and an overlap ratio (e/d) of 0.24 yield the most favorable rotational speed and maximized performance for the two-scoop blade arrangement.
- Citation du texte
- S. K. Dhiman (Auteur), 2018, Effect of some design parameters: A performance test on VAWT, Munich, GRIN Verlag, https://www.grin.com/document/440975
