Pratt & Whitney Canada PW100
The PW100 series from Pratt & Whitney Canada includes turboprop engines from 1800 to 2750 shaft horsepower for regional airliners from 30 to 70 seats. They are used, among other things, in the De Havilland DHC-8 and their competing models ATR 42 and ATR 72 .
The current and so far most powerful model of the PW100 series is the PW150A with an output of over 3400 kW .
All types differ only insignificantly from the outside. A striking feature of the smallest engine (PW118 with 1800 HP) is the small propeller flange, while the newer and most powerful engines (PW119, PW124, PW127) stand out due to the insulated hot part area.
A distinction is also made between small (low power) and large (high power) motors. The main difference lies in the blow-off valve (also HBV = Handling Bleed Valve, with the PW119 IBV = Intercompressor Bleed Valve) for discharging excess air between the low and high pressure compressor. This is necessary because the low-pressure system works without a load (oil pump, fuel pump, DC generator) and would therefore deliver too much air to the high-pressure compressor when idling. This air is released into the environment (outboard).
The large family includes the PW123 to PW127, the small PW118 to PW121 including the PW119. The PW119 is a large motor (Turbomachinery / TMM), with a small gear (Reduction Gearbox / RGB). This ensures that the hot part area is relieved as the power has been throttled.
The engine has three rotor systems: high pressure (HP), low pressure (LP) and drive system (PT). These consist of a radial compressor (HP and LP only) and a single-stage (HP / LP) and a two-stage (PT) turbine.
The centrifugal compressors are made of titanium . They are milled from solid material and are accordingly expensive, but last around 30,000 flight hours for safe operation. Since titanium is not resistant to high temperatures, is predominantly in the hot portion Inconel used. This nickel-based alloy is also provided with various coatings to increase its durability.
In contrast to the PT6 , the PW100 has the air inlet at the front and the outlet at the rear. Therefore, a long shaft has to transmit the power from the drive turbine forward to the two-stage gearbox.
See also: Pratt & Whitney
Technical specifications
The three-shaft turbine has a two-stage compressor of the high-pressure and low-pressure part, an annular combustion chamber with reverse flow of air, a single-stage high-pressure and low-pressure turbine, and a two-stage power turbine .
In the PW150A, three axial and one radial compressor stages replace the two radial compressor stages of the other engines in the series. A two-channel FADEC is also installed.
For specific fuel consumption, see Specific fuel consumption
| Engine | Starting power (kW) | Dry weight (kg) | Diameter (mm) | Length (mm) |
|---|---|---|---|---|
| PW121 | 1603 | 425 | 838 | 2134 |
| PW123 | 1775 | 450 | ||
| PW127E | 1790 | 481 | ||
| PW127F | 2051 | 450 | ||
| PW127H / J / M | 2051 | 481 | ||
| PW150A | 3781 | 690 | 1105 | 2423 |
Web links
- PW100 series on the manufacturer's side
- PW150 series on the manufacturer's side
- EASA-TCDS-E.041 (PDF; 692 kB) - Type certification of the "PW100" series
Individual evidence
- ↑ FlugRevue December 2009, p. 81, list of turboprop engines