It is found that a brimmed diffuser accelerate the wind into the turbine, and a wind turbine with brimmed diffuser can produce more power than turbine only. Recently we research turbine blade for brimmed diffuser, and we found that the blade using thick airfoil at blade root (named NT-blade) can make good match for our brimmed difiuser. In this paper we compare NT-blade and normal blade using only NACA63 airfoil (named N-blade), and discuss it.
