内冷涡轮叶栅三维气热耦合数值模拟

Numerical simulation of conjugate heat transfer for an internally cooled 3-D turbine blade

为了研究涡轮动叶的内部冷却技术,对采用绝热边界的实心叶片、采用气热耦合的实心叶片和采用气热耦合的空冷叶片进行了研究.发现叶片导热对叶片温度场的影响相当显著;具有带肋蛇形通道和涡流矩阵肋片的内冷结构能使叶片温度大幅下降,但叶片表面温度分布不均匀性增大,换热系数沿叶片表面呈不规则分布.

To study the internal cooling technology of turbine blade, three types of blades, i. e. non-cooled blade using adiabatic boundary condition, non-cooled blade using conjugate heat transfer method, and air-cooled blade using conjugate heat transfer method, were studied. The results show that heat conductivity of the blade has a significant influence on blade temperature distribution; the structure of rib-roughened cooling and latticework cooling makes the blade temperature drop markedly. However, this leads to increased nonuniformity of blade temperature distribution and irregular heat transfer coefficient distribution on the blade surface.