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Operation Manual / Power2 850-M / 4 Product description
1 Introduction / 1.3 Layout and function of the low-pressure stage
© Copyright 2019 ABB. All rights reserved.
HZTL4061_EN
Rev.B
June 2019
Mode of operation of the low-pressure stage (Power2 LP)
Fig. 3: Power2 LP diagram
Power2
Two-stage turbocharging
21
HP compressor
Power2 LP
Low-pressure stage
22
HP turbine
Power2 HP High-pressure stage
24
LP turbine
A
Exhaust gas inlet from internal combus-
tion engine
25
LP compressor
B
Exhaust gas outlet
26
Intercooler
C
Air or air/gas mixture inlet
D
Air or air/gas mixture outlet and supply
to the charge air cooler
- - -
Not included in the ABB Turbo Sys-
tems scope of delivery
The low-pressure stage (Power2 LP) is a turbomachine and consists of the main components
turbine and compressor. These components are installed on a common shaft and form the
rotor.
In the low-pressure stage (Power2 LP) shown in the illustration
tion of the low-pressure stage
, the exhaust gas coming from the high-pressure stage
(Power2 HP) flows through the gas inlet casing (06) and the nozzle ring (07) and reaches the
turbine (08). The LP turbine uses the energy contained in the exhaust gas to drive the rotor.
The exhaust gases then reach the atmosphere through the gas outlet casing (05) and the ex-
haust gas pipe connected to it.
The rotor runs in two radial plain bearings, which are located between the compressor and
the turbine. The axial bearing is also in the form of a plain bearing. 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 lies at the deepest point of the bearing casing (09).
The LP compressor wheel (02) that is connected to the shaft sucks in fresh air or an air/gas
mixture through the filter silencer (01) or the air suction branch. The air is compressed in the
LP compressor and the downstream diffuser (03). The compressed air is passed on to the in-
tercooler (26) via the compressor casing (10). The air is cooled in the intercooler (26) and
subsequently supplied to the HP compressor (21).
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