I'm trying to design an axial fan to be mounted on an axis inside a hollow cylinder. I thought this would be a simple part, but everything I throw at it seems to think itself an impeller, all I'm getting is radial flow and recirculation. Can anybody look at my Flow Sim file and tell me what I'm doing wrong?

Cut plot showing exhaust recirculation (yellow colors is velocity flowing back towards fan)

Flow trajectories showing intake air turning back at the fan and being exhausted through the inlet.