4.3 Inflation Air
The sealing air system is used to seal the VTA.
The sealing air prevents the exhaust gas from penetrating under the inner
guide ring.
Pressurizing the inner guide ring with sealing air minimizes the radial gap
between the inner guide ring and the guide vane, even under varying thermal
conditions, and maximum efficiency is achieved.
See Figure VTA sealing air system.
Air from the charge air pipe or an external compressor can be used.
The pressure in the sealing air pipe must be greater than the exhaust gas
pressure upstream of the turbine.
S
S
A
A
510.010
510.021
510.020
510.030
510.001
E
E
E
E
E
510.001 Guide ring, outer 510.021 Guide ring, inner E Exhaust gas
510.010 Turbine guide vane 510.030 Sealing cover S Inflation air
510.020 Retaining ring
Figure 14: VTA inflation air system
NOTE A pipe is provided on the turbocharger side for connecting the
sealing air. This is defined as an interface to the scope of supply
of the engine manufacturer.
The pipe is permanently connected to the gas admission casing. The sealing
air does not restrict the rotatability of the gas admission casing, however.
Functional principle of the
sealing air system IAS
(Inflation Air System)
Air source
Pressures
Sealing air pipe connection
4 Systems
4.3 Inflation Air
2013-12-04 - de
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MAN Diesel & Turbo
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