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Estimation of ship speed loss and associated CO_2 emissions in a seaway

机译：估算航道中的船速损失和相关的CO_2排放

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摘要

A reliable prediction of attainable ship speed at actual seas is essential from economical and environmental aspects. A methodology for estimating the attainable speed in moderate and severe sea is proposed. The irregular sea is handled as a series of regular waves with different amplitudes and frequencies. The added resistance in regular waves is obtained by either a direct pressure integration method or an asymptotic small wavelength formula. 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 propulsion results for regular waves are used in simulating results in irregular waves. It is shown that for higher sea states this effect has much more influence on the speed loss than the added resistance in 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 attainable ship speed is obtained as time series. Correlation of speed loss with sea states allows predictions of propulsive performance in actual seas. The expected CO2_ emission for a containership is estimated for the Northern route of North Atlantic.
机译：从经济和环境方面来看，可靠预测海上实际航行速度至关重要。提出了一种估计中度和重度海域可达到速度的方法。不规则海被视为一系列具有不同幅度和频率的规则波。通过直接压力积分法或渐近小波长公式获得规则波中的附加电阻。螺旋桨在强海中的进出水效果和通气由不同螺旋桨浸没的实验数据的准稳态平均来解释。规则波的推进结果用于模拟不规则波的结果。结果表明，对于海况较高的情况，此影响对速度损失的影响要大于波浪中附加的阻力。通过考虑实际海域中的发动机和螺旋桨性能以及船舶的质量惯性来计算速度损失。可获得的船速是按时间序列获得的。速度损失与海况的相关性可以预测实际海中的推进性能。估计一艘集装箱船的预期二氧化碳排放量为北大西洋的北部航线。

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