Vortex generators are designed to keep the airflow over the flying surface during critical angles of attack. They allow the ailerons to retain authority even at slow forward speed. I don’t believe our rotors suffer from loss of authority during slow speed events. They even maintain authority in vertical descent. If the question is about a better airflow for speed then I believe you have to look at different airfoil designs or a streamlined cover for the hubbar. Probably the people who could answer this best Chuck Beaty and Jim Vanek, have already tried most ideas for improvements on blade systems.
I may not be correct. However, I’m not mixing up the two. I’m merely pointing out the use of VGs. Since VGs are used on fixed wing aircraft I felt it necessary to draw attention to their intended use via examples in type. The below post expounds on VGs use in adhering boundary layers to the surface. I agree with the post. I’m not sure VGs on rotorblades would have a positive effect since we (as far as I’m aware) don’t suffer from boundary layer separation. Anyway, those are my thoughts and I’m just a Forum poster not an engineer.I don't think that's correct. You are mixing up slow speed of the aircraft fuselage/system with speed of its wing (rotary). Our rotors will kill you if they get too slow. You got to think like you are a fly on the wing (rotor) when thinking of rotor speed (not airspeed of the gyroplane). Doesn't mean to say that VG's would solve some big problem but just that you are stuck in your seat instead sitting on the rotor blade when conceptualizing this