Page 58: of Maritime Reporter Magazine (September 2004)

Propulsion Annual

TOR: The Next-Generation Turbocharger

Following the introduction of the TCA axial turbocharger two years ago, MAN

B&W Diesel Group announced an expansion of the range to include a com- pletely new radial turbocharger. The

TCR turbocharger will replace the cur- rent NR series that has been in produc- tion for nearly 50 years culminating in the current NR/S design. The new TCR additional sealing air requirement. The piston ring gasket, combined with a labyrinth seal, was thoroughly tested and proved to provide optimum sealing capacity both in operation and at stand- still. Flow calculations played a major part in the development of the new tur- bine in order to create a shape with high efficiency on the one hand and a wide application range on the other.

Consequently the new turbine is designed to provide optimum values in part load and full load operation and the manufacturer reports that it is equally suitable for constant and pulse pressure turbocharging. Development work also concentrated on the noise level by the introduction of a completely new intake silencer, which reduces the turbocharger noise.

Circle 31 on Reader Service Card series has a compressor pressure ratio of 4.7; but capable of up to 5.2 when built as a special version. Aimed specifically at the medium and high-speed diesel and gas markets, six different models are able to cover a wide range of outputs from 400 to almost 6,000 kW.

The TCA and TCR are the first MAN

B&W Diesel turbochargers to be com- pletely designed using a 3D-CAD sys- tem, a move which simplified and reduced development work by integrat- ing innovative software tools during the

CFD (flow) and FEA (strength) analysis.

With regard to the rotor support, the

MAN B&W engineers came up with something special: The axial bearing was located between the two radial bear- ings which permitted minimization of the bearing space requirements. The sealing system was also designed to be as compact as possible and without any

SSS Clutches Enjoys

Success

SSS Clutches are automatic-engaging, free- wheel-type, overrunning clutches that transmit torque through the surface contact of invo- lute-shaped gear coupling teeth. SSS

Clutches have been supplied directly to 30 navies and are used by over 40 navies world- wide in gas turbine, diesel, and electric-drive main propulsion of cruisers, destroyers, frigates, patrol boats, SES, hydrofoils, hover- craft and high-speed ferries. SSS Clutches are also used for gas turbine generator starters and steam turbine turning gears.

The U.S. Navy has utilized nearly 800 in their fleet. In addition, we have supplied the SSS-

Tosi Reversing System for fixed-pitch propeller ships which consists of a reversing, hydraulic coupling for maneuvering and a direct-drive

SSS Clutch for efficient ahead propulsion.

Circle 29 on Reader Service Card m

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September 2004

Circle 320 on Reader Service Card 57