LOW NOISE FAN STATIONARY BLADE

摘要

PROBLEM TO BE SOLVED: To provide a low noise fan stationary blade capable of reducing noise without reducing aerodynamic performance by reducing full pressure losses of both a hub side and a tip side and reducing noise both on the hub side and the tip side. SOLUTION: This stationary blade has a negative lean angle θL in the opposite direction of rotation near the hub and a positive lean angle θL in the rotation direction on the tip side other than the hub. The negative lean angle θL is -10 deg.±3 deg. in a high loss region near the hub, and the positive lean angle θL is 30 deg.±3 deg. on the tip side. The stationary blade also has a positive sweep angle θS. The positive sweep angle θS is 20 deg.±3 deg. on the hub side and 20 deg.±3 deg. also on the tip side.