溝付のステップシールの静特性評価

抄録

For the sealing device for rotary bodies such as turbo compressors, labyrinth seals are using because of a non-contact seal. In recent years, labyrinth seals have been required that improvement of sealing performance along with increasing pressure of turbo machineries. In this paper, it is suggested that new step seals (Groove-step seal) have high sealing performance only wearing grooves in the axial of fundamental step seals. This study was carried out by CFD analysis. First, optimal groove structure was shown by study of changing the width and depth of the groove in the rotor of step seals. And then, it became clear that Groove step seals have effect of reducing leakage up to 22 % compared to general step seals. Further, it was shown the sealing effect range of axial gap between the rotor and stator by verification of the CFD. And it was confirmed that Groove step seals have the effect of reducing leakage, if the pressure condition has changed.