静态封严篦齿内部流动与换热的数值计算

建立二维篦齿模型,运用数值方法,从分析齿腔内流场和篦齿顶板换热的角度研究了篦齿的封严特性.通过多种工况的计算,探讨了雷诺数、齿顶宽和齿隙之比对篦齿腔内流动、压降损失以及齿腔顶板换热系数之间的关系.计算数据和实验数据进行比较,发现变化规律一致,误差较小.研究结果表明:雷诺数、齿顶宽和齿隙之比影响着齿腔内部流动和换热的状态,是最终成为决定篦齿封严效果的重要因素.

Numerical analyses of flow field and heat transfer in cavity of straight labyrinth seal at static state

In order to investigate the performance of straight sealing labyrinth at static state in aero engine,a model of straight sealing labyrinth was established and applied to compute the flow characteristics and heat transfer in the straight sealing labyrinth.With the result of numerical simulation,the effects of Reynolds numbers and T/C on flow field,pressure loss,and coefficient of heat transfer were studied.By comparing some group results of numerical simulation and experiments data,it is found that the numerical results are in agreement with experimental data and the error can be acceptable.The results show that the Reynolds number and T/C affect the flow characteristics and heat transfer in the straight sealing labyrinth and thus are important factors in deciding the sealing performance of straight labyrinth.