An assessment of the ship drag penalty arising from light calcareous tubeworm fouling
An assessment of the ship drag penalty arising from light calcareous tubeworm fouling
复制标题
轻质钙质管虫污垢引起的船舶阻力损失的评估
DOI：
10.1080/08927014.2016.1148140
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发表时间：
2016
期刊：
影响因子：
2.7
通讯作者：
N. Hutchins
中科院分区：
文献类型：
--
作者：
J. Monty;E. Doğan;Ronald E. Hanson;A. Scardino;B. Ganapathisubramani;N. Hutchins
摘要对涂有轻钙质管虫污垢的试件进行了扫描、缩放和复制，用于风洞试验，以确定等效沙粒粗糙度ks。发现该表面具有ks = 0.325 mm，显著小于先前报道的轻度钙质结垢的值。该结果被用来预测一艘满负荷船舶的阻力。为了实现这一目标，提出了一种改进的方法来预测空间发展的湍流边界层（TBL）的总阻力，如船体上的TBL。该方法数值积分的表面摩擦的边界层的长度，假设一个分析形式的平均速度分布的TBL。速度分布包含粗糙度（结垢）信息，使得预测仅需要输入ks、自由流速度（船速）、运动粘度和边界层长度（船体长度）。利用实验确定的等效沙粒粗糙度高度，预测FFG-7奥利弗佩里级护卫舰在巡航时，如果其船体被涂上轻质钙质管虫污垢，其总阻力将增加23%。一艘同样被污染的大型原油运输船在巡航时的总阻力将增加34%。
Abstract A test coupon coated with light calcareous tubeworm fouling was scanned, scaled and reproduced for wind-tunnel testing to determine the equivalent sand grain roughness ks. It was found that this surface had a ks = 0.325 mm, substantially less than the previously reported values for light calcareous fouling. This result was used to predict the drag on a fouled full scale ship. To achieve this, a modified method for predicting the total drag of a spatially developing turbulent boundary layer (TBL), such as that on the hull of a ship, is presented. The method numerically integrates the skin friction over the length of the boundary layer, assuming an analytical form for the mean velocity profile of the TBL. The velocity profile contains the roughness (fouling) information, such that the prediction requires only an input of ks, the free-stream velocity (ship speed), the kinematic viscosity and the length of the boundary layer (the hull length). Using the equivalent sandgrain roughness height determined from experiments, a FFG-7 Oliver Perry class frigate is predicted to experience a 23% increase in total resistance at cruise, if its hull is coated in light calcareous tubeworm fouling. A similarly fouled very large crude carrier would experience a 34% increase in total resistance at cruise.
基于表面扫描的粗糙表面湍流的直接数值模拟
影响因子：
2.8
作者：
Busse A
通讯作者：
Busse A