Operation Manual / Power2 340-H / Low-pressure stage
1 Introduction / 1.5 Layout and function of the low-pressure stage
© Copyright 2022 ABB. All rights reserved. HZTL4053_EN Rev.F March 2022
Mode of operation of the low-pressure stage (Power2 LP)
Fig.3
Power2 Two-stage turbocharging 21 HP compressor
Power2 LP Low-pressure stage 22 HP turbine
Power2 HP High-pressure stage 23* Gas piping (bellows)
A Exhaust gas inlet from internal combus-
tion engine
24 LP turbine
B Exhaust gas outlet 25 LP compressor
C Air or air/gas mixture inlet 26 Intercooler
D Air or air/gas mixture outlet and supply
to the charge air cooler
- - - Not included in the Turbo Systems
scope of delivery
*) If present
The low-pressure stage(Power2 LP) is a turbomachine and its main components are a tur-
bine and a compressor. These components are installed on a common shaft and form the ro-
tor (see Fig.2: →8).
In the low-pressure stage(Power2 LP) shown in the sectional view (see Fig.2: →8), the ex-
haust gas flows through the turbine casing(12) and the nozzle ring(11) and then reaches the
turbine(07). The turbine uses the energy contained in the exhaust gas to drive the rotor. The
exhaust gases then reach the atmosphere through the gas outlet flange(10), the gas outlet
casing(09) and the exhaust gas pipe connected to it.
The rotor runs in two radial plain bearings(06), which are located in the bearing casing(04)
between the compressor and turbine. The axial thrust bearing(05) is located between the
two radial plain bearings. The plain bearings are connected to a central lubricating oil duct
which is normally supplied by the lubricating oil circuit of the engine. The oil outlet always
lies at the deepest point of the bearing casing.
The compressor wheel(15) is also located on the rotor. The compressor wheel sucks in fresh
air or an air/gas mixture through the air suction branch (01) or filter silencer. In the com-
pressor wheel, the energy required for building up the pressure is transferred to the air or
air/gas mixture. As the air or air/gas mixture flows through the diffuser(03), the com-
pressor casing(02) and the intercooler(26), it is compressed further, cooled and then
guided into the HP compressor(21).
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