The effect of hub leakage flow on the performance of a transonic fan stator has been investigated numerically using the NEWT unstructured grid Navier-Stokes solver. The experimental configuration which has been modelled has two leakage flow paths: the first being a channel under the stator platform starting in the rotor-stator cavity upstream of the blade leading edge and rejoining the main flow downstream of the blade trailing edge; the second channel is in the form of a small gap between adjacent stator hub platforms, which joins up with the first channel. The experimental results indicate a severe corner separation in the stator hub region. Predictions with no leakage path considerably underestimate this corner separation. When the under-platform channel is modelled the corner stall becomes much worse than measured but it is considerably reduced when the inter-platform gap is included.

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