動静翼干渉によるタービン動翼ミッドスパンの非定常流れ

概要

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With the new generation of small-sized gas turbine engines, low Reynolds number flows have become increasingly important. In this study, the unsteady flow field at midspan in an axial-flow turbine rotor at low Reynolds number was investigated experimentally using a laser Doppler velocimetry (LDV) system. The time-averaged and time-dependent distributions of velocity, flow angle, vorticity, turbulence intensity, and Reynolds stress were analyzed in terms of both absolute frame of reference and relative frame of reference. In the relative frame of reference, the nozzle wake has a slip velocity relative to the mean flow, which causes the wake fluid to migrate across the rotor passage and accumulate on the rotor suction surface. The effect of nozzle wake on the flow field inside the rotor was determined qualitatively and quantitatively.
2002-07-20