Abstract
This paper provides experimental investigations of unsteady flow behaviors in a single axial flow turbine stage with two axial gaps. The aim of this study is to clarify the effect of the axial gap on the unsteady flow field, where the 3-D unsteady flow field downstream of rotor blades is measured using a slant-type hot wire probe. Since the flow field is likely to be affected by the disk and tip cavity flow when the stator-rotor axial gap increased, the cavities on both hub side and casing side were kept constant (about 1 mm) by attaching several rings to openings of the cavities. In addition, we have compared time-averaged flow fields measured by a five-hole probe with unsteady experimental results.
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