Effect research of labyrinth seal structure and dynamics parameters

Abstract:

Numerical method is used for solving rotor-seal nonlinear dynamics equation, so that the dynamics effects of whirl speed, pre-whirl, labyrinth seal gap, pressure are investigated, and the leakage effects of seal gap, pressure, labyrinth seal structure are researched. The numerical method is verified to be correct by ex- periments. The results show that reducing pre-whirl and increasing seal gap can reduce the cross-stiffness coef- ficients, and improve stability purposes. There is a critical value of tooth width l. 04 mm, the leakage seal in- creases with the increasing of tooth width when it is more than the critical value, and the leakage seal decrea- ses with the increasing of tooth width when it is less than the critical value. At the same whirl speed, the leak- age increases with the increase of labyrinth seal and pressure, and decreases with the decrease of cavity depth