基于多孔介质模型的指尖密封泄漏流动分析

Analysis of leakage flow through finger seal based on porous medium

将指尖密封处理为多孔介质,把压力梯度作为多孔介质动量方程中的源项,根据试验结果确定了源项中的系数,结合指尖密封的结构参数提出了用于指尖密封泄漏的多孔介质模型,利用该模型计算结果与试验结果吻合较好,证明利用该模型模拟指尖密封泄漏是可行的.流场计算结果表明:指尖密封与转子接触部分的孔隙率对泄漏影响比较大,指尖密封的承压部分主要为后挡板内径以下区域.

The finger seal was treated as porous medium.The pressure gradient was regarded as the source term of momentum equation.The coefficient in source term was confirmed by experimental results.A porous medium model for the leakage through finger seal was put forward by combining with the finer seal configuration.The computational results showed a good agreement with the experimental results,the model was proved to be practicable for simulating the leakage of finger seal.Flow field computational results show that the influence of the porosity of finger contact pad on leakage is great,and the pressure grads in the finger seal are mainly distributed below the inner diameter of aft cover plate.