Mechanism and performance of a hydrofoil bubble generator utilized for bubbly drag reduction ships
Mechanism and performance of a hydrofoil bubble generator utilized for bubbly drag reduction ships
复制标题
气泡减阻船水翼气泡发生器的机理和性能
DOI：
10.1016/j.oceaneng.2020.108085
复制
发表时间：
2020
影响因子：
5
通讯作者：
Y.Tasaka
中科院分区：
文献类型：
--
作者：
Y.Murai;H.Sakamaki;I.Kumagai;H.Park;Y.Tasaka
继水翼气泡发生器在海洋船舶上的气泡减阻取得成功(Kumagai等人，2015)之后，我们进行了两种实验来说明和改进其工作原理。首先，通过PIV测量来阐明在自由表面下运行的水翼的流动结构。证实了水翼反失速特性与弗劳德数的依赖关系和水翼上方垂直压力梯度的抵消，使大气中的空气进入水中。其次，我们将水翼安装在100m拖曳装置中运行的模型船上，发现了实现气泡产生的三种不同的两相流流型。气泡的体积流量随航速的增大而增大，增大到2次方，气泡的壁面占有率也随航速的增大而增大。此外，还测量了水翼在气泡产生过程中的阻力，并将其用于估算净节电，从而证明了水翼气泡发生器在高速条件下用于长船的优越性。
Following the success of bubbly drag reduction for marine vessels by hydrofoil bubble generators (Kumagai et al., 2015), we conducted two kinds of experiments to specify and improve its working principle. Firstly, PIV measurement was carried out to elucidate the flow structure around a hydrofoil running beneath a free surface. Froude number dependence of the anti-stall characteristics and cancellation of vertical pressure gradient above the hydrofoil were confirmed, which entrain the atmospheric air into water flow. Secondly, we mounted the hydrofoil to a model ship that runs in a 100-m-towing facility and found three different two-phase flow patterns in realizing bubble generation. Volume flow rate of generated bubbles increased with the ship speed to the power of greater than two, thus wall-occupation fraction of bubbles also increases with the ship speed. Furthermore, hydrofoil drag during bubble generation was measured and used to estimate net power-saving, having proved advantage of the hydrofoil bubble generator for long ships at high speed conditions.
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影响因子：
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