electronic-control system. In essence, ed to start in August 2007. Commercial
the matching process involves defining deliveries of MAN Diesel’s TCA and
the band in which vane adjustments are TCR turbochargers with VTA technolo-possible by setting their minimum and gy are scheduled to start at the end of
maximum pitch to match the operating 2008. MAN Diesel confirmed that the
range of the engine. Within these limits, systems will be offered in all sizes of
the vanes can be varied infinitely.” TCA and TCR turbocharger. A
Sea trials for the test engine aboard SEE DIRECTLINK @
the shallow-draught tanker are expect- WWW.DIESELGASTURBINE.COM
Visit Us At Power-Gen Euope, Booth K25
A close-up look shows the detail of the nozzle ring with adjustable vanes, here in the
axial variant for the TCA axial turbocharger.
trolled engines and engines with electronic management. For retrofit applications, MAN Diesel will offer complete packages including the VTA nozzle ring, the actuator and the associated
control system.
“The inclusion of VTA technology
on the axial TCA55 turbocharger
allows up to 0.5 bar in variation in
compressor output pressure at part-load,” noted Andre Voges, application
engineer at MAN Diesel, after completion of the shop tests. “Shop tests
included NOx certification of the
engine, and the overall results from the
test bench showed expected improvements at part-load in terms of fuel consumption, as well as considerable reductions in emissions of soot and
unburned hydrocarbons. It was also
demonstrated that VTA technology
gave a useful new dimension to the
mechanically controlled engine. The
effects are comparable to the use of
variable-valve timing and electronic
engine control.”
Voges further explained that VTA
also makes the process of matching the
turbocharger to the engine much simpler. “In contrast to fixed-geometry turbochargers where a suitable nozzle ring
with fixed vanes is chosen from a number of alternatives, there is only one
VTA module per turbocharger size covering all matching possibilities,” said
Voges. “The vane-adjustment range is
matched to the charge-air requirements
of the engine via the software of the
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