Numerical Investigation on Principal Design Parameters of Straight Darrieus Wind Turbine

概要

論文の詳細を見る
Straight Darrieus wind turbine has attractive characteristics such as the ability to accept wind from random direction and easy installation and maintenance. But the aerodynamic performance is proved to be very complicated, especially for the existence of Dynamic stall. How to get better aerodynamic performance arouses lot of interests in the design procedure of a straight Darrieus wind turbine. In this paper, we are trying to explore the better choice of some primary design parameters of straight Darrieus wind turbine based on numerical investigation. Mounting position on the blade, radius of the wind turbine, tip speed ratio and number of blades together with solidity are mainly focused on. As to the numerical method, the flow around the turbine is simulated by solving the two-dimensional unsteady Navier-Stokes equation combined with continuous equation. The time marching method on a body-fitted coordinate system based on MAC method is used. O-type grid is generated to the total calculation domain. In order to compare the numerical results with the validated results of single-bladed turbine, NACA0015 section is still selected as the wind blade section. The characteristics of tangential and normal force are discussed related with dynamic stall of the blade. Averaged Power coefficient per period of rotating is calculated to evaluate the eligibility of the turbine.
2005-03-20