engleski

A methodology for estimating the ship fuel consumption at sea waves

In this paper a methodology for estimating the attainable ship speed and related fuel consumption and carbon dioxide (CO2) emissions in moderate and severe sea is proposed. The in-and-out-of-water-effect and ventilation of a propeller in severe seas is accounted for by a quasi-steady averaging of experimental data for different propeller submergences. The added resistance results for regular waves are used in simulating results in irregular waves. The speed loss is calculated by taking into account the engine and propeller performance in actual seas as well as the mass inertia of the ship. The numerical model used for main propulsion engine modeling is based on a zero-dimensional model of an internal combustion engine. The attainable ship speed is obtained as time series for head and following sea. Correlation of speed loss, fuel consumption and CO2 emission with sea states allows predictions of propulsive performance in actual weather conditions.

seakeeping; added resistance; CO2 emissions; fuel consumption

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