- 수평축 풍력 및 조류발전용 터빈
- Alternative Title
- A Study on the Optimum Blade Design and Performance Analysis for Horizontal Axis Wind Turbine & Tidal Current Turbine
- Publication Year
- 한국해양대학교 대학원
- Wind turbines interact with the wind, capturing part of its kinetic energy and converting it into usable energy. This energy conversion is the result of several phenomena. The wind is characterized by its speed and direction, which are affected by several factors, e.g. geographiclocation, climate characteristics, height above ground, and surface topography. Atmospheric turbulence causes important fluctuating aerodynamic forces on windturbines.
Turbulence is an important source of aerodynamic forces on wind turbine rotors. Some commonly used turbulence terms that refer to the physical descriptions of the wind are defined below. Turbulence is an irregular motion of fluid that appears when fluids flow past soil surfaces or when streams of fluid flow past or over each other.
Many of the rotors found on current available HAWT systems are designed using a combination of 2-D airfoil tools, 3-D blade element momentum (BEM) theory, in which, the unsteady flow effects are either ignored, or modeled using a synthesis of 2-D data
hence, these methods are not capable of accurately modeling three-dimensional dynamic stall processes, tower shadow effects, tip relief effects, and sweep effects.
These three-dimensional effects can alter the air loads, influence the fatigue life, and significantly influence the maintenance cost of HAWT systems.
In this paper, 3D flow and performance analysis on a 5kW rotor blade has been carried out by using the 3-D Navier-Stokes commercial solver (ANSYS CFX-11.0) to provide more efficient design techniques to the HAWT engineers. The rotor diameter is 5.07m and the rotating speed is 180.82rpm. The rated power and its approaching wind velocity at design point(TSR=6) are 5kW and 10m/s respectively. The pressure distribution on the blade's suction side tells us that the pressure becomes low at the leading edge of the airfoil as it moves from the hub to the tip.
The first objective of this paper was to predict aerodynamic performance of the 5kW wind turbine system with wake effect and analyze fluid dynamics using CFD followed by 5kw counter rotating wind turbine. Results for performance analysis of the Counter-Rotating wind turbine system are compared with those of single rotor systems against the dual rotor. The results demonstrated the excellence is effectiveness of the Counter-Rotating wind turbine system.
The second objective of the paper is to utilize the horizontal axis turbine rotor blade developed with aerodynamic be applied to tidal current energy. Recently 3 bladed horizontal axis rotor blade of the highest efficiency was modified for 100kW class HATT which will be installed at real site, mean tidal current 2.3 m/s position nearby Neok-island in the southern part of Korea peninsula. The HATT was adapted for numerical analysis and the compatibility of HATT is verified using a commercial computational fluid dynamics (CFD) code, ANSYS-CFX. The results obtained from the numerical analysis, such as pressure, streak line, velocity vector and torque data was analyzed by performance curves for 100kW-class cross flow energy integrated type bi-directional tidal current turbine.
Appears in Collections:
- 기계공학과 > Thesis
- Files in This Item:
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.