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Active clearance control (ACC) is a method used in large aircraft gas turbines to improve fuel efficiency during cruise. This is achieved by setting the turbine tip clearance at more than one operating point and contrasts with passive clearance control which sets it for only one condition and is explained below.
The engine features active turbine clearance control providing the optimal level of cooling air for different phases of flight. [ 8 ] At take-off, the fan displaces up to 1.3 t (2,900 lb) of air per second, the jet nozzle velocity is almost 1,000 mph (450 m/s) and each high pressure turbine blade generates around 800 hp (600 kW), rotating at ...
Stability and control derivatives change as flight conditions change. The collection of stability and control derivatives as they change over a range of flight conditions is called an aero model. Aero models are used in engineering flight simulators to analyze stability, and in real-time flight simulators for training and entertainment.
Area control centre [1] ACC Active clearance control: Turbine engine system ACC Accessory In gas turbine engine ACE Actuator control electronics ACFT Aircraft [3] ACI Airports Council International: ACLS Automatic carrier landing system: Aircraft carrier operations ACM Air cycle machine: Part of A/C air conditioning system ACMS
The LMS100 comprises a low-pressure compressor, an intercooler, a supercore and a power turbine. The supercore (comprising a HP compressor, compressor rear frame, high-pressure turbine and intermediate pressure turbine) is a further development of the LM6000, which in turn was based on the CF6-80C2. The low-pressure compressor is from the 6FA ...
In this method groups of two, three or more nozzles form a set and each set is controlled by a separate valve. The actuation of individual valve closes the corresponding set of nozzle thereby controlling the flow rate. In actual turbine, nozzle governing is applied only to the first stage whereas the subsequent stages remain unaffected. [1]
Mockup with compressor and turbine cutaway. After the budget of NASA on aeronautics research was severely cut at the start of 2006, Pratt & Whitney committed to spend $100 million a year on the geared turbofan (GTF) development for the next generation of single-aisle airliners, focused on the 25,000–35,000 lbf (110–160 kN) thrust range. [9]
Tuning a control loop is the adjustment of its control parameters (proportional band/gain, integral gain/reset, derivative gain/rate) to the optimum values for the desired control response. Stability (no unbounded oscillation) is a basic requirement, but beyond that, different systems have different behavior, different applications have ...