中文摘要：

采用包含固体域和流体域的耦合传热数值求解方法，研究了典型燃气轮机用迷宫密封内的传热特性，并与实验值进行了对比。通过计算得到了两种间隙下 13 齿迷宫密封转子面和静子面附近的 Nu 分布，计算值与实验值吻合良好。研究结果表明：在所考核的涡黏湍流模型中，由 k-ω 和 SST 湍流模型计算得到的Nu 值与实验值吻合良好，标准 k-ε 湍流模型和 k-ε RNG 湍流模型计算得到的 Nu 值比实验值高约 70%；对于直通型光滑面迷宫密封，在静子面上，第一齿前区域的 Nu 沿轴向逐渐增大，在其后的区域内 Nu 以某一定值上下波动；在转子面上，腔室区域 Nu 沿轴向逐渐增大，齿尖区域 Nu 有较大突跳。Re 对迷宫密封静子面上平均 Nu 的影响程度大于转子面；随 Re 增大，静子和转子固体域内的温度梯度逐渐增大，但 Nu 分布曲线的形状却基本不变。

英文摘要：

By using the conjugated heat transfer computational method,heat transfer characteristics in the straight through the labyrinth seal used in a typical gas turbine were numerically investigated and the predictions were compared with the experimental data.At two different sealing clearances,the Nu distributions on the rotor and stator surfaces were computed for the smooth labyrinth seal with 13 fins.The calculated Nu distributions agree well with the experimental data in a range of Re numbers.The results show that the turbulence model has a significant effect on the heat transfer computations.Among the selected eddy viscosity turbulence models,the k-ω and SST models show superior accuracy to the k-ε and k-ε RNG models which over-predict Nu by about 70%.On the labyrinth seal stator,Nu increases in the axial direction before the first clearance while it fluctuates with a certain value after the first clearance.On the rotor surface,Nu increases in the axial direction in the chamber region and jumps sharply in the clearance region.The temperature gradients in the solid domains of the stator and rotor increase with an increase in Re,but the distribution profiles of Nu in the axial direction are nearly similar for each Re.