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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 fuel control unit is the large yellow-painted component mounted on the rear of the gearbox. A fuel control unit (FCU) is a control system for gas turbine engines . Fundamentals of turbine engine control
Environmental control system (ECS) schematic of Boeing 737-300. On jetliners, air is supplied to the ECS by being bled from a compressor stage of each gas turbine engine, upstream of the combustor. The temperature and pressure of this bleed air varies according to which compressor stage is used, and the power setting of the engine. A manifold ...
The basic operation of the gas turbine is a Brayton cycle with air as the working fluid: atmospheric air flows through the compressor that brings it to higher pressure; energy is then added by spraying fuel into the air and igniting it so that the combustion generates a high-temperature flow; this high-temperature pressurized gas enters a ...
Fuels such as natural gas or oil can also be burnt directly in gas turbines (internal combustion), skipping the steam generation step. These plants can be of the open cycle or the more efficient combined cycle type. The majority of the world's thermal power stations are driven by steam turbines, gas turbines, or a combination of the two.
The SAC turbine has one single concentric ring where the DLE turbine has two or three rings with premixers depending on gas turbine type. [2] DLE technology demands an advanced control system with a large number of burners.
Airborne collision avoidance system: ACC 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
The propelling nozzle converts a gas turbine or gas generator into a jet engine. Power available in the gas turbine exhaust is converted into a high speed propelling jet by the nozzle. The power is defined by typical gauge pressure and temperature values for a turbojet of 20 psi (140 kPa) and 1,000 °F (538 °C). [18]