带周向挡片的迷宫密封动力特性的研究

RESEARCH ON DYNAMIC CHARACTERISTICS OF LABYRINTH SEAL WITH CAVITY SEPARATION BLADES

迷宫密封腔内的气体流动，可以通过由双控制体模型导出的基本方程组来表示。在此基础上，针对带周向挡片的迷宫密封，提出了利用优化原理求解其静态非线性偏微分方程组的方法，然后在静态解基础上，将方程组线性化，最终计算出密封的动力特性系数。计算结果表示，用这种方法得出的结果，与试验结果有较好的一致性。

The basic flow equations are established in two control volumn model for the new type of labyrinth seal,in which cavity separation blades are fixed fo reduce the circumferential flow.Linearized zeroth and first order perturbation equations are developed for small motion about a centered position by an expansion in the eccentricity ratio.The principle of optimization is applied to solve zeroth order equations.The first order equations are solved by a separation of variable solution.The dynamic coefficients are obtained by integration of the resultant pressure distribution.The calculation results coincide good with experimental results.