MAN ready to launch two-stage turbocharger

14 Jun 2010
MAN's compact two-stage turbocharger with intermediate cooling

MAN's compact two-stage turbocharger with intermediate cooling

MAN Diesel & Turbo is now ready to bring two-stage turbocharging to the market with the introduction of its TCX generation.

With the new TCX Series, MAN Diesel & Turbo has developed a new generation of turbochargers especially aimed at two-stage turbocharging. The TCX series is based on the proven design philosophy of the TCA/TCR-series with uncooled casings and durable plain bearings. While the well-known TCA/TCR series use axial and radial turbines respectively, the new TCX-series employs a novel, diagonal turbine that is ideally suited to the lower-pressure ratios.

The lower-pressure ratios affect flow-ducting components as well as bearings and casings. Especially at the high-pressure level, increased thrust forces are imposed on the bearing system. Also the sealing air used for turbine shaft sealing is adjusted to suit the changed pressure levels. Furthermore, the tightness of all turbocharger casings must be ensured because of the higher pressures in the higher-pressure turbocharging stage.

Two-stage turbocharging poses a number of challenges not exclusively related to turbochargers but also to the implementation of the engine’s charging system. Besides the space and piping requirements that an additional turbocharger stage requires, an optimised intercooler is also included. In response to this, MAN Diesel & Turbo has delivered a compact solution where the turbochargers are arranged at 90° to each other.

In comparison to single-stage turbochargers, the TCX series incorporates characteristic features especially suited for lower-pressure ratios per stage:

• optimised component characteristics at low-pressure ratios
• the use of pressure-ratio reduction for the benefit of air capacity increase
• the use of pressure-ratio reduction for the benefit of dynamic behaviour
• compactness in order to minimise additional space (and weight) requirements for the two-stage turbocharger system including intercoolers
• matching of compressor and turbine capacities to accommodate low-pressure ratios
• wider application ranges per turbocharger size

Links to related companies and recent articles ...

MAN Diesel A/S

view more