Abstract
In this paper, the fundamental performances on the stepped labyrinth seal with various thicknesses and positions of the fin were investigated experimentally in both the stationary and rotating states. As a result, it was found that the leakage in the downward stepped type was less than that in the upward stepped type. In the former case, the optimum seal performance was achieved under the condition that the height of step was 2.5 times as large as the width o the clearance. The seal performance was improved with decreasing the thickness of fines in the case the fines ware placed in the middle of pitch. The performance was also improved by bringing the fines near to the step in the case that the thickness of the fines was equal to the half of a pitch. It was also found that the above-mentioned condition, when compared with the condition in which the straight-through type labyrinth seal was used, had a superior leakage prevention effect, in which the straight-through type labyrinth seal was used, had a superior leakage prevention effect, in which leakage rate decreased by about 70% in the stationary state and by 80% in the rotational state.
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