Airfoil blades meshing
 

Helllo everybody
Am facing a great problem ,
My geometry is as follow :
Outer domain ( BOX)
Inner domain ( Cylinder )
Inside the inner domain there is Turbine with airfoil blade profile

When I generate the mesh the orthogonal quality is very low in range of 5 time 10 to the power -3 something like that

I tried alot to improve the mesh quality but nothing works beside that i can not even add inflation beyond the blades

Any help please
thanks in advance