TCA Project Guide - Document - MAN Diesel & Turbo

1 MAN Diesel & Turbo
TCA Project Guide TCA Project Guide
TCA
Exhaust Gas Turbocharging
Performance Characteristics
The modular design of the TCA Series allows for optimal adaptation of the
turbochargers to the conditions for both four-stroke and two-stroke engines.
For each TCA turbocharger, both single-connection as well as double-connection
gas admission casings are available, enabling optimum results to be
achieved in terms of design and economy.
The turbochargers of the TCA Series are designed for constant-pressure turbocharging.
With constant-pressure turbocharging, the engine exhaust gases flow into a
common exhaust manifold, accumulate there and flow at constant pressure
to the exhaust turbine.
1 Exhaust gases 2 Fresh air 3 Charge air
Figure 1: Constant-pressure turbocharging
The following operating characteristics are distinguished:
▪ Generator curve (constant engine speed)
▪ Standard propeller curve (variable engine speed)
▪ Propeller curve at reduced engine speed (high torque)
▪ Combined curve (combination of generator and propeller curve)
▪ Vehicle engine curve
2 (3) TCA 1-01 EN
Irrespective of the purpose for which the engine is being used, a safe distance
is always required between all possible operating points and the surge
line of the compressor. This is ensured by dimensioning the compressor
accordingly.
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2011-03-24 - de