Pratt & Whitney Canada PW100
The series of Pratt & Whitney Canada PW100 turboprop engines includes 1800 to 2750 shaft horsepower for regional aircraft from 30 to 70 seats. You will find, among other things used in the Bombardier QSeries and their competitors patterns ATR 42 and ATR 72 The latest and so far most powerful model of the PW100 series is the PW150A with over 3400 kW.
All types differ only marginally from the outside. A striking feature of the smallest engine ( PW118 with 1800 HP ) is the small propeller, while the newer and most engines ( PW119, PW124, PW127 ) notice through the insulated hot sub-area.
Similarly, a distinction is made between small motors ( low power) and large ( high power ). The main difference is due to the blow-off valve (also HBV = Handling Bleed Valve, the PW119 IBV = Intercompressor Bleed Valve ) To remove excess air between the low - and high-pressure compressor. This is necessary because the low-pressure system is operating with no load (oil pump, fuel pump, DC generator ), and so would deliver too much air at idling speed to the high pressure compressor. This air is discharged into the environment ( Outboard ).
To the family of large ones belong PW123 PW127 up, the small PW118 PW121 to PW119 including the. The PW119 is a great engine ( Turbo Machinery / TMM), with a small gear (Reduction Gearbox / RGB). This ensures that the hot portion is relieved, as the power is reduced.
The engine has three rotor systems: high-pressure (HP), low-pressure ( LP) and drive system ( PT). These consist of centrifugal compressors (HP and LP) and stage (HP / LP) and two-stage ( PT) turbine.
The centrifugal compressor are made of titanium. They are milled from solid material and are priced accordingly, but keep a safe operation approximately 30,000 flight hours. Since titanium is not high temperature resistant, Inconel is used predominantly in the hot sub-area. This nickel-base alloy is additionally provided with various coatings ( coatings) to increase the durability.
In contrast to the PT6 the PW100, the air inlet, the outlet front, back. Therefore, a long shaft must be transmitted to the two-stage transmission, the force from the power turbine to the front.
See also: Pratt & Whitney
Specifications
The turbine has a three-shaft, two -stage compressor of the high-pressure and low-pressure part, an annular combustion chamber with a rear air flow, a single stage high-pressure and low-pressure turbine, and a two-stage power turbine.
When PW150A replaced three axial and radial compressor stages the two radial compressor stages of the other engines in the range. In addition, a dual channel FADEC is installed.