Abstract: The temperature of the low sulfur oil may rise during the supply of diesel engines due to the influence of the environment of the machinery space in summer, resulting in low viscosity of the low sulfur oil at inlet causing abnormal operation of the diesel engine. There is currently no method for fuel viscosity calculation based on marine environment. A mathematical equation for the variation of the fuel viscosity with the temperature is therefore established through the relation between the convective heat transfer, pipe wall heat transfer, and external convective heat transfer in low sulfur oil transportation pipelines. A viscosity temperature model of the low sulfur oil pipeline system is established to study the influence of summer conditions on low sulfur oil transportation in pipelines based on the construction layout of ultra large container ship platforms and ship pipelines. The results indicate that the low sulfur fuel from the latest fuel standard can meet the requirements of viscosity at inlet of most commercial diesel engines for daily use for ultra large container ships with appropriate design and arrangement of pipelines. This calculation method can also be used to verify and estimate the viscosity and temperature changes of non-phase-change fluids under marine environments.

Key words: container ship, low sulfur oil, viscosity, temperature, convective heat transfer, calculation

摘要： 受夏季工况的机舱环境影响,低硫油在供给柴油机的过程中可能出现温升,导致进机黏度过低,引起柴油机运行异常。针对当前没有基于船舶环境的燃油黏度计算方法的现状,该文通过低硫油输送管道中的对流传热、管壁传热和外部对流传热的关系式,建立燃油黏度随温度变化的数学方程,并基于超大型集装箱船平台和实船管路施工放样,建立低硫油管系的黏温工程模型,研究低硫油在管路输送时受机舱夏季工况的影响。结果表明：对于管路设计和布置合理的超大型集装箱船,采用最新燃油标准的低硫油可满足商用柴油机日常使用的进机黏度要求。该计算方法也可用于验证和预估船用环境下的无相变流体黏度和温度变化。

关键词: 集装箱船, 低硫油, 黏度, 温度, 对流传热, 计算