ブラシ付ラビリンスシールの漏れ特

抄録

Labyrinth seal used in rotary machine or gas turbine has normally large amount of leakage which impairs the improvement of performance. In this research work presented hereunder, the seal performance was improved by combining labyrinth seal and brush on the rotor together. The test results showed that more than 50% of improvement of seal performance against the conventional straight type of the labyrinth was confirmed with this arrangement in the stationary state. In addition, very interesting tendencies were also found : The leakage decreased as rotation speed increased and stopped at a certain circumferencial velocity in the case that the brush was provided right behind labyrinth contraction fin (down stream) and rotor was rotated. On the other hand, leakage was increased as the circumferencial velocity increased in the case that the brush was provided in front of labyrinth contraction fin (upper stream).