An experimental study on the static and dynamic characteristics of damper seals.

Abstract

The static and the dynamic characteristics for two types of damper seals with triangular hollows are experimentally investigated. The dynamic characteristics are measured for various parameters such as preswirl velocities. pressure differences between the inlet and outlet of seals, whirling amplitudes, and rotor rotating speeds. The results are also compared with those of the smooth seal obtained previously. As a result, the leakages of damper seals are only about 2/3 those of the smooth seals, and for a given surface pattern, there may be an optimum hollow depth which gives minimum leakage. The damper seals have smaller radial reaction forces and larger tangential reaction forces compared with the smooth seal. The effect of the preswirl velocities on the dynamic characteristics of damper seals is obviously smaller than that of the smooth seal.