Chord Reynolds numbers of turbine blades in the 300kW Industrial Ceramic Gas Turbine (CGT) Project are between 104 and 105. Although a few studies on the characteristics of airfoils at low-Reynolds-numbers have been reported, it is not clear how turbulence of the main flow affects the characteristics of airfoils. Some wind tunnel tests for determining the characteristics of an airfoil have been conducted using a wind tunnel with a specially designed turbulence generator. We summarize the designed turbulence generator, in which the turbulence intensity can be controlled continuously, and the performances of the wind tunnel with the turbulence generator, and describes some results of airfoil characteristics and flow visualization obtained by the oil flow method at the Reynolds numbers of 0.5×105, 1.0×105 and 2.0×105.