Computational Study of the Unsteady Flow due to Wakes Passing Through a Channel
The flow in, and the heat transfer to, turbine cascades are influenced strongly by rotor-stator-interaction causing wakes from the preceding row to pass through the cascade channel. Predictions of this unsteady flow are presented for the idealised case of a plane channel with the wakes generated by cylinders moving past the inlet plane. The calculations are obtained with an unsteady finite-volume method employing the k — ε turbulence model. The calculation procedure is verified first for developing steady channel flow and is then applied to the unsteady passing wake situation for various moving-cylinder-channel configurations. The results show that the passing wakes cause much stronger velocity fluctuations then would be due to turbulence.
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