MAN Diesel provides fuel saving with newly acquired Kappel Propeller

By Peter Pospiech at December 07, 2012 14:04
Filed Under: Company News, drive systems

The MAN Alpha propeller program has added further fuel-saving and energy-efficient propulsion opportunities to its portfolio with the purchase of Kappel Propeller and the integration of its tip-fin propeller blade designs for both controllable pitch and fixed pitch propellers.
In  today’s  market,  green  technology, fuel-savings, energy optimization  and  increased  propulsion  efficiency  are  more  important  than ever – both for new ship designs, retrofit and upgrade solutions for  existing  ships.  MAN  Diesel  & Turbo will now further mature the energy  saving  technology  it  now owns and implement it in a greater variety of customer solutions including, for example, the hydrodynamic integration of rudder bulbs, high-efficiency  rudders,  hull  flow-guiding devices and ducts. Compared to conventional designs, Kappel propeller blade designs offer fuel savings of up to 6%. This improved Kappel design is related to the blade design alone and does not rely on improvements to other components, such as a rudder bulb integrated with propeller and rudder. Optimized propeller and propulsion efficiencies contribute to lowering  the  EEDI (Energy  Efficiency Design  Index)  of  ships,  as  every gram  of  fuel  saved  by  means  of higher propulsive efficiency results in more energy-efficient transport – as can be seen in the previous example by up to 6%. Compared  to  a  conventional  design,   Kappel  propellers have shown lower pressure  impulses, which means bigger and more efficient  propellers  can  be  utilized because of the reduced clearance between hull and propeller tip.

MAN Alpha Kappel tip-fin design features and benefits: tip vortices are formed due to the difference in pressure between the pressure and suction side of the propeller as water moves from the region of high pressure to that of low pressure. The pressure on both sides near the tip will therefore equalize and  the effciency of the tip region decreases. The Kappel design minimizes the flow over the tip, and the outer region of the Kappel propeller therefore retains a high effciency increasing the total effciency of the Kappel propeller compared to conventional designs

MAN Alpha propellers, FPP, with four-bladed conventional blade design (left) compared with a five-bladed with Kappel tip-fin design (right).

Graphs: courtesy of MAN Diesel&Turbo

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