| 摘要 |
An engine casing ( 16 ) encloses a rotor ( 15 ) and has a wall the inner surface ( 17 ) of which has slots ( 20 ) therein. An abradable lining ( 19 ) is attached to the inner surface ( 17 ) of the wall and extends across the slots ( 20 ). The abradable lining ( 19 ) is fluid permeable so that in operation a fluid passes through the lining ( 19 ) and recirculates in the slots ( 20 ). Recirculation of the fluid within the slots ( 20 ) increases the aerodynamic efficiency of the rotor ( 15 ). |
