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Diagram of a typical gas turbine jet engine. Air is compressed by the compressor blades as it enters the engine, and it is mixed and burned with fuel in the combustion section. The hot exhaust gases provide forward thrust and turn the turbines which drive the compressor blades. 1. Intake 2. Low pressure compression 3. High pressure compression ...
A free-piston gas generator is a free-piston engine whose exhaust is used to power a gas turbine. It combines the functions of compressor and combustion chamber in one unit. These machines were quite widely used in the period 1930–1960 but then fell out of favour. [1]
The Mk.705 of 3,900 hp (2,900 kW) was the first version used the Bristol Britannia 100 and some 300 series aircraft. The Mk.755 of 4,120 hp (3,070 kW) was used on the 200 series (not built) and other 300s, and the Mk.765 of 4,445 hp (3,315 kW) was used on the RAF Series 250 aircraft.
If the hotter parts can be removed without disturbing the rest of the engine, for example without removing the complete engine from the aircraft, maintenance costs are reduced. It was achieved with the PT6 by having the hottest parts, the gas generator turbine and combustor, at the propeller end.
In mid-2011 an upgrade was announced which will lead to a cut in weight for each engine by 23 kg (51 lb). The new components come from Volvo Aero. [6] MTU Aero Engines is a major partner of the programme, with 22.5% share. The German company produces the high-pressure turbine, the low-pressure turbine and the turbine center frame.
The HP compressor is driven by a single-stage turbine. On the LP spool a three-stage turbine drives a single-stage fan and a four-stage LP compressor. The engine made its first flight August 21, 2000 on a test aircraft flown from Plattsburgh International Airport (KPBG), successfully completing a 1-hour-20-minute flight. [ 1 ]
For engines, the time between overhauls is generally a function of the complexity of the engine and how it is used. [1] Piston-based engines are much more complex than turbine-powered engines, and generally have TBOs on the order of 1,200 to 2,000 hours of running time.
The family of engines generates 15,000 to 34,000 lbf (67 to 151 kN) of thrust, it uses gearboxes rated between 16,000 hp (12,000 kW) and 32,000 hp (24,000 kW). [41] By putting a 3:1 gearbox between the fan and the low-pressure spool, each spins at its optimal speed: 4,000–5,000 RPM for the fan and 12,000–15,000 RPM for the spool, the high ...