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Active clearance control (ACC) is a method used in gas turbines to improve fuel efficiency. This is achieved by dynamically controlling the turbine tip clearance. During normal cruise flight, the engine is exposed to many loads such as intense heat and centrifugal force. This causes expansion of certain components and alters the gap between the turbine casing and tips of the spinning turbine blades. The amount of air leaking around, past the edge of the blades without passing through them is critical to engine performance and fuel efficiency. For this reason since the late 1960s, blade tip sealing has taken on a prominent role in aircraft engine design. The ACC system dynamically controls the high pressure turbine (HPT) blade clearance. This can be achieved in numerous ways.

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  • Active tip-clearance control
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  • Active clearance control (ACC) is a method used in gas turbines to improve fuel efficiency. This is achieved by dynamically controlling the turbine tip clearance. During normal cruise flight, the engine is exposed to many loads such as intense heat and centrifugal force. This causes expansion of certain components and alters the gap between the turbine casing and tips of the spinning turbine blades. The amount of air leaking around, past the edge of the blades without passing through them is critical to engine performance and fuel efficiency. For this reason since the late 1960s, blade tip sealing has taken on a prominent role in aircraft engine design. The ACC system dynamically controls the high pressure turbine (HPT) blade clearance. This can be achieved in numerous ways.
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  • Active clearance control (ACC) is a method used in gas turbines to improve fuel efficiency. This is achieved by dynamically controlling the turbine tip clearance. During normal cruise flight, the engine is exposed to many loads such as intense heat and centrifugal force. This causes expansion of certain components and alters the gap between the turbine casing and tips of the spinning turbine blades. The amount of air leaking around, past the edge of the blades without passing through them is critical to engine performance and fuel efficiency. For this reason since the late 1960s, blade tip sealing has taken on a prominent role in aircraft engine design. The ACC system dynamically controls the high pressure turbine (HPT) blade clearance. This can be achieved in numerous ways.
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