Turkey: Istanbul Shipyard Installs Wake Equalizing Duct onto DCV36 Vessel Agat

Recently wake equalizing duct (WED) was installed onto DCV36 vessel “Agat” at the Istanbul Shipyard dock (Tuzla, Turkey). Aim of WED installation is to decreasing fuel consumption. Wed was installed first time in domestic practice.

During trials of the head vessel of the series “Ametist” speed was of 12.8 kn in ballast condition while ME load was of 90%. This result corresponds to speed of 12.1 kn for fully load vessel. Nature test fully confirmed prognostic CFD modeling calculations; expected speed value was of 12.7 kn for 90% ME load.

WED is an energy-keeping gauge proposed by Prof. Schneekluth in 1985. WED is assigned to flatten out velocity field of nominal wake. Design of this gauge was worked out by German firm “Schneekluth Hydrodynamik”. This firm produced WED gauges for all DCV36 series.

WED installation on the DCV36 vessels was introduced by specialists of Marine Engineering Bureau and MDT firm in 2008 in order to decrease fuel consumption (and speed increase for 0.2 kn in lfull load or ballast condition).

Ground of WED usage reasonability and defining of their optimal placing relative to screw were carried out by specialists from 2nd department of CNII named for academic A.N.Krylov under direction of Prof. Grigoriy Kanevskiy.

A set of tests was fulfilled, as follows: towing and self-running tests of vessel’s model without WED for ballast and fully loading conditions, self-running tests of the model with WED varying angle between WED and CL, self-running tests of the model with WED at optimal place.

Thanks to the tests it was proofed that WED usage increase hull-efficiency factor, same time propulsion coefficient increases for 6% for full loading case and for 7% for ballast loading.

[mappress]

Shipbuilding Tribune Staff, November 30, 2011; Image: meb