A lot of different jet engines I see will have fan blades with really complex and curvy shapes. When an aerospace engineer designing a jet engine comes up with that fan blade shape: What’s the moving air (in simulation or air-tunnels) supposed to look like? And why?
For that matter what is the engineer who designs a simple box fan doing when they make the blades curve to be wider at the edge and stuff? I’m assuming these designs move the air better then a straight blade but why? What’s the airflow look like?