Hi all, I was thinking of doing an experiment with axial fan for determining it's stall condition. By stall, here, I mean airfoil stall. I want to do this experiment in order to gain a firm grasp on the concept of stall. I have read the theory but an experiment would definitely give me an intuitive feel about the concept. So I wanted to make a fan stall and observe it's behavior. The fan i am thinking of using is a CPU cooling fan and mounting it in a converging passage. I was thinking of varying its speed in order to make it stall. Is it possible to do this (would it work)? Also what else can I do to make it work? All I want is to observe the behavior of the fan when it is stalled. Also how would I come to know whether the fan has stalled or not? Is it the vibrations/sound of the fan? Do I need some added instrumentation for determining this? Any direction for making this work is greatly appreciated.