带三维扰流元的方形通道内流动换热的数值模拟研究

In the internal cooling channels of turbine blade, the turbulators are usually employed to enhance the heat transfer and take away the heat conducted into the blade walls, therefore protect the blade. A kind of three dimension turbulaor is investigated in a square duct. The effects of the flow and structure parameters on the flow and heat transfer characters are studied. The height of the turbulator is 1/8 of the channel equivalent diameter. The Reynolds number is changed from 1.5×10 ⁴ to 8.0×10 ⁴ . The pitches between turbulators in the flow direction are 3~10 times of the turbulator's height. The results show that the change of the Reynolds number only affects the heat transfer intensity, and does not affect the heat transfer distribution character. The aligned arrangement of turbulator may cause higher heat transfer enhancement than the staggered arrangement. With the increase of pitch between the turbulators, the average Nusselt number ratio and the flow resistance coefficient ratio of the channel are decreasing. This decreasing trend slows down when the pitch is greater than 8 times of turbulator's height. The best heat transfer enhancement can be achieved when the front angle of turbulators is about 80°.