the fillet structure decreases the transverse pressure difference near the rotor hub and shroud, and shifts the aerodynamic load to the latter half part of the rotor blade.
倒角结构降低了动叶根、顶处横向压差,气动负荷向动叶栅后半部分转移;
it is shown that the rotor hub viscous frictional torques have a larger magnitude than the other retarding torques.